RADIANT SLAB COOLINGTECHNOLOGYA NEW ERA IN ENERGY EFFICIENCY

DCI (Delhi Chapter of ISHRAE)Indian Society of Heating Refrigerating & Air Conditioning Engineers

Vol : IV Issue : 1 Edition : July 2012 Editor : Shami Bhardwaj

Presidential TwitterDear Friends,

It gives me immense pleasure to present

my thoughts in Twitter. With Editor Mr.

Shami Bhardwaj, we look forward to his

more creative attempts to maintain and

enhance our readers interest in this

publication. As you all are aware a new

CWC committee took charge with effect

from 2nd April 12. I am sure we will strive to continue the good

work done by the preceding CWC’s and also improve the

services that the society renders.

DCI hosted the 1st National BOG on 25th & 26th May 2012 at

Tarudhan Valley Manesar. It was pleasing, as mentioned by

Society President Mr. Sushil Choudhury too, to see nearly full

BOG in attendance, with important deliberations and Motions

passed during the two day conference. Besides engaging in

discussions on Society matters and presentations, members

indulged into playing a friendly Cricket tournament, IPL (Ishrae

Premier League) which was organized under flood lights with

professional umpires and commentators on duty. The whole

BOG was formed into 4 teams namely Racon Knight Riders,

Acreconf Daredevils, Confluence Warriors & Acreserve Super

Kings. Competitive, yet friendly spirit was on display, finally

Acreserve Super Kings lifted the coveted IPL trophy. Sachin

Maheshwari and Jagdeep Singh plus other DCI committee

members gave birth to this noble idea to host such an event,

yours truly implemented it.

IIE Delhi & DCI, being integrated now, will be working more

closely & putting their best efforts in order to fulfill the mission of

dissemination of knowledge. Efforts are being made by DCI to

energise and motivate sub-chapters. Important events like that

of Urjavarans and Acreserves have been allocated, one event

CWC Installation at Sub-ChaptersLucknow Sub-chapter: The new CWC took the oath on 25th Agra Sub-chapter: CWC of Agra Sub-chapter was installed on

Apr’ 2012 in the presence of DCI President Mr. Sunil Kher, RD 28th Apr , witnessed by Mr. Jagdeep Singh, Mr. Sunil Kher &

(North 1) Mr. Jagdeep Singh & Regional Chair (Membership) Mr. Sanjay Gupta. Mr. B D Rishi is the President for current

Mr. Ashwani Jain. Mr. C K Sharma is the President for the society year. The event was covered by local media.

current Society year.

Meerut Sub-Chapter: The new CWC installed on 7th Apr’ 2012

at Meerut Sub-chapter. Mr. Amit Goel is the President for current

society year. The ceremony was attended by the National

President Mr. Sushil K Choudhury, DCI President Mr. Sunil

Kher, DCI Secretary Mr. Abid Hussain & Executive Secretary

Mr. Girish Sachar.

Dehradun Sub-chapter: The Installation ceremony was

conducted on 26th Apr’ 2012 in the presence of RD (North 1) Mr.

Jagdeep Singh, DCI President Mr. Sunil Kher & DCI President-

Elect Mr. Sanjay Gupta. Mr. Rajan Vohra leads the CWC team

as President for the current society year.

Lucknow Sub-chapter Meerut Sub-Chapter

Dehradun Sub-chapter Agra Sub-chapter

to each of our sub-chapters namely Dehradun, Lucknow, Agra &

Meerut. For reasons of propping up sub-chapters, mentors

have been identified for Meerut : Mr. A.K. Goel & Mr. Abid

Hussain, For Agra: Mr. Ashwani Jain, For Dehradun : Mr.

Prabhat Goel, For Lucknow : Mr. Sanjay Gupta.

All Committee chairs are putting in their best to serve Society to

meet its objectives. Thanks to our Webmaster team ( Shishir

Gupta and Yesha Choudhury ) for taking initiatives to make DCI

website more attractive and dynamic, which shall be ready by

end of July. Student Activities chair under Dhiraj Rastogi,

Programmes under Samdarsh Nayyar, Mass Mailing under

Sanjay Gupta, Acreserve Under Ashwani Jain, Membership

under Ravi Khurana etc. are all progressing in leaps and

bounds.

DCI has finalized their yearly calendar for all their technical

programmes including the mega International conference

Acreconf 2013, which is scheduled to be held in Delhi on

February 8th & 9th 2013.

As we know the growing economy of India is causing a rapid

increase in energy consumption . As a result India is showing a

growing demand for new, energy efficient and sustainable

solutions to maintain the indoor climate. “Radiant floor cooling”

can make a contribution to this demand. With radiant floor

cooling it is possible to obtain large energy savings in a

relatively simple and inexpensive manner.

In order to know more about this new emerging technology

which can address the energy saving issues the theme of this

Twitter issue is based on “RADIANT COOLING” .

Best Regards,

Sunil Kher

President (2012-2013)

National BOG MeetingThe 1st National BOG meeting of society year 2012-13 was comprehensive Society Operation Manual is due by mid-year.

hosted by DCI and organized at Tarudhan Valley Resort in BOG decided that each location should conduct a minimum of Manesar near Delhi on 25th & 26h May’ 2012. The meeting was one good quality program during the current society year.very well attended although some of the locations could not

The formal society meeting was complemented by an make it due to last minute unavoidable circumstances. The two

interesting event- introduction of “ISHRAE Premier League” a days program was supported by M/s Voltas Ltd.

night cricket bonanza appreciated by one and all. The Besides routine business on Membership, Programs, Student participating members emphasized continuity of this Activities, Financial health and Compliances, a variety of memorable initiative in future.initiatives were presented and discussed. This included

implementation of ISHRAE Software for ON-LINE Working,

Mentors Programs for Sub-chapters, ISHRAE Showcase at

selected Colleges, a comprehensive study to assess the size of

HVAC&R industry and a PR exercise using the services of

professional agency and updation of handbooks.

National President emphasized on regular scrutiny of

Membership Applications and allotment of grades by

respective Chapters/ Sub-chapters. The implementation of the

BOG decision for collection of Sustenance/ Renewal Fees

should be focused by all concerned to achieve the set targets. A

revised version of Chapter Operation Manual and another

This year, DCI team organized a trip to many first timers to China. The delegates

China Refrigeration held in Beijing. The truly appreciated the massive scale of the

entire event was spearheaded by our exhibition and the comprehensive nature of

President Elect Mr Sanjay Gupta. The tour the exhibits. Many members travelled with

operator, Red Carpet Tours did a superb job their families and took advantage of the

in ensuring all the delegates were looked economically priced package. The trip

after very well. The trip was from 10th -14th concluded with a visit to the Great Wall of

April, Over 60 members of ISHRAE shared China.

a memorable journey to China, including

DCI Delegation VisitsChina Refrigeration, Beijing

NewJoineeat DCIThe Twitter team welcomes

Mr. Vikram Maini, who has

joined the DCI Secretariat

as a secretary in June’ 2012.

He brings a wealth of

administrative experience to

the table and we hope

to further streamline our

Secretariat with his help. He

is stationed at the Laxmi

Nagar office. We wish him a

fruitful tenure with DCI.

Presidential TwitterDear Friends,

It gives me immense pleasure to present

my thoughts in Twitter. With Editor Mr.

Shami Bhardwaj, we look forward to his

more creative attempts to maintain and

enhance our readers interest in this

publication. As you all are aware a new

CWC committee took charge with effect

from 2nd April 12. I am sure we will strive to continue the good

work done by the preceding CWC’s and also improve the

services that the society renders.

DCI hosted the 1st National BOG on 25th & 26th May 2012 at

Tarudhan Valley Manesar. It was pleasing, as mentioned by

Society President Mr. Sushil Choudhury too, to see nearly full

BOG in attendance, with important deliberations and Motions

passed during the two day conference. Besides engaging in

discussions on Society matters and presentations, members

indulged into playing a friendly Cricket tournament, IPL (Ishrae

Premier League) which was organized under flood lights with

professional umpires and commentators on duty. The whole

BOG was formed into 4 teams namely Racon Knight Riders,

Acreconf Daredevils, Confluence Warriors & Acreserve Super

Kings. Competitive, yet friendly spirit was on display, finally

Acreserve Super Kings lifted the coveted IPL trophy. Sachin

Maheshwari and Jagdeep Singh plus other DCI committee

members gave birth to this noble idea to host such an event,

yours truly implemented it.

IIE Delhi & DCI, being integrated now, will be working more

closely & putting their best efforts in order to fulfill the mission of

dissemination of knowledge. Efforts are being made by DCI to

energise and motivate sub-chapters. Important events like that

of Urjavarans and Acreserves have been allocated, one event

CWC Installation at Sub-ChaptersLucknow Sub-chapter: The new CWC took the oath on 25th Agra Sub-chapter: CWC of Agra Sub-chapter was installed on

Apr’ 2012 in the presence of DCI President Mr. Sunil Kher, RD 28th Apr , witnessed by Mr. Jagdeep Singh, Mr. Sunil Kher &

(North 1) Mr. Jagdeep Singh & Regional Chair (Membership) Mr. Sanjay Gupta. Mr. B D Rishi is the President for current

Mr. Ashwani Jain. Mr. C K Sharma is the President for the society year. The event was covered by local media.

current Society year.

Meerut Sub-Chapter: The new CWC installed on 7th Apr’ 2012

at Meerut Sub-chapter. Mr. Amit Goel is the President for current

society year. The ceremony was attended by the National

President Mr. Sushil K Choudhury, DCI President Mr. Sunil

Kher, DCI Secretary Mr. Abid Hussain & Executive Secretary

Mr. Girish Sachar.

Dehradun Sub-chapter: The Installation ceremony was

conducted on 26th Apr’ 2012 in the presence of RD (North 1) Mr.

Jagdeep Singh, DCI President Mr. Sunil Kher & DCI President-

Elect Mr. Sanjay Gupta. Mr. Rajan Vohra leads the CWC team

as President for the current society year.

Lucknow Sub-chapter Meerut Sub-Chapter

Dehradun Sub-chapter Agra Sub-chapter

to each of our sub-chapters namely Dehradun, Lucknow, Agra &

Meerut. For reasons of propping up sub-chapters, mentors

have been identified for Meerut : Mr. A.K. Goel & Mr. Abid

Hussain, For Agra: Mr. Ashwani Jain, For Dehradun : Mr.

Prabhat Goel, For Lucknow : Mr. Sanjay Gupta.

All Committee chairs are putting in their best to serve Society to

meet its objectives. Thanks to our Webmaster team ( Shishir

Gupta and Yesha Choudhury ) for taking initiatives to make DCI

website more attractive and dynamic, which shall be ready by

end of July. Student Activities chair under Dhiraj Rastogi,

Programmes under Samdarsh Nayyar, Mass Mailing under

Sanjay Gupta, Acreserve Under Ashwani Jain, Membership

under Ravi Khurana etc. are all progressing in leaps and

bounds.

DCI has finalized their yearly calendar for all their technical

programmes including the mega International conference

Acreconf 2013, which is scheduled to be held in Delhi on

February 8th & 9th 2013.

As we know the growing economy of India is causing a rapid

increase in energy consumption . As a result India is showing a

growing demand for new, energy efficient and sustainable

solutions to maintain the indoor climate. “Radiant floor cooling”

can make a contribution to this demand. With radiant floor

cooling it is possible to obtain large energy savings in a

relatively simple and inexpensive manner.

In order to know more about this new emerging technology

which can address the energy saving issues the theme of this

Twitter issue is based on “RADIANT COOLING” .

Best Regards,

Sunil Kher

President (2012-2013)

National BOG MeetingThe 1st National BOG meeting of society year 2012-13 was comprehensive Society Operation Manual is due by mid-year.

hosted by DCI and organized at Tarudhan Valley Resort in BOG decided that each location should conduct a minimum of Manesar near Delhi on 25th & 26h May’ 2012. The meeting was one good quality program during the current society year.very well attended although some of the locations could not

The formal society meeting was complemented by an make it due to last minute unavoidable circumstances. The two

interesting event- introduction of “ISHRAE Premier League” a days program was supported by M/s Voltas Ltd.

night cricket bonanza appreciated by one and all. The Besides routine business on Membership, Programs, Student participating members emphasized continuity of this Activities, Financial health and Compliances, a variety of memorable initiative in future.initiatives were presented and discussed. This included

implementation of ISHRAE Software for ON-LINE Working,

Mentors Programs for Sub-chapters, ISHRAE Showcase at

selected Colleges, a comprehensive study to assess the size of

HVAC&R industry and a PR exercise using the services of

professional agency and updation of handbooks.

National President emphasized on regular scrutiny of

Membership Applications and allotment of grades by

respective Chapters/ Sub-chapters. The implementation of the

BOG decision for collection of Sustenance/ Renewal Fees

should be focused by all concerned to achieve the set targets. A

revised version of Chapter Operation Manual and another

This year, DCI team organized a trip to many first timers to China. The delegates

China Refrigeration held in Beijing. The truly appreciated the massive scale of the

entire event was spearheaded by our exhibition and the comprehensive nature of

President Elect Mr Sanjay Gupta. The tour the exhibits. Many members travelled with

operator, Red Carpet Tours did a superb job their families and took advantage of the

in ensuring all the delegates were looked economically priced package. The trip

after very well. The trip was from 10th -14th concluded with a visit to the Great Wall of

April, Over 60 members of ISHRAE shared China.

a memorable journey to China, including

DCI Delegation VisitsChina Refrigeration, Beijing

NewJoineeat DCIThe Twitter team welcomes

Mr. Vikram Maini, who has

joined the DCI Secretariat

as a secretary in June’ 2012.

He brings a wealth of

administrative experience to

the table and we hope

to further streamline our

Secretariat with his help. He

is stationed at the Laxmi

Nagar office. We wish him a

fruitful tenure with DCI.

1. The 13th Batch of Advance Diploma Course completed in 5. IIE has conducted a workshop on “Fundamentals of

the Month of July 2012. Most of the students have been Applied Psychrometry” by Dr. A.K.Saluja on 7th July 2012,

placed in the industry already. at Qutub Hotel Delhi. It was highly appreciated by all the

Participants. 36 professionals from different industries had 2. 14th Batch for Advance Diploma Course is starting from attended the workshop. Dr. R.K Sharma, Director, NHB has August 2012. Admissions are open. Interested candidates also attended the workshop and distributed certificates to can contact at below mentioned email address or can visit all the participants. Both the workshop were inaugurated by our website.Mr. Sunil Kher president DCI. The programme was

3. IIE Distance learning Programme in HVAC&R for working coordinated by Mr. V.K.Seth and IIE Team.

professionals is getting popular overseas as well as in India. 6. IIE Delhi organized Diploma Award Function for its passed Admissions for distance learning are available anytime.

out students along with DCI, CWC installation on 2nd April.4. IIE has conducted a workshop on “Chilled Water System

Design for Large Commercial Buildings” by Mr. Ajay Raj email : ierf05@gmail.com,

(Consulting Engineer) on 19th May 2012, at Qutub Hotel website : www.ierfeducation.org

Delhi. About 40 participants attended the workshop from

NCR as well as from various other cities’.

IIE, Delhi Activities

DCI President Mr. Sunil Kher inaugurating the Workshop

on Psychrometry

DR. A K SALUJA Conducting workshop on fundamental of

Applied Psychrometry

Upcoming EventsPlease take note of the following upcoming events organised by DCI and its sub-

chepters. Please lookout for more information which will be dissemnated closer to the

events. The Twitter editorial team urges all members to take advantage of most, if not all

of these events, especially the mega conference ACRECONF. Watch out for their

special rate offer on the back page of this issue.

• Workshop on Duct Design and Air distribution - 1st Sept’ 2012

• Product Presentation - 14th Sept’ 2012

• ACRESERVE Agra - 6th Oct’ 2012

• URJAVARAN Dehradun - 13th Oct’ 2012

• ACRESERVE Meerut -30th Nov’ 2012

• URJAVARAN Lucknow - 15th Dec’ 2012

Proposed Topics for workshop

• Challenges of Refrigerants Phase Out

• Integration of DG Set Security Fire Alarm and other Building Services Integrated

BMS System

• Data Centers

• Hospital & Healthcare

• BIM

Upcoming NationalEvents

1. Refconf – Chennai

2. Techfest – Goa

3. ACR Trendz – Pune

4. Ventconf – Kolkata

5. Confluence – Ahmedabad

6. EEHVAC&R – Ranchi

7. Acreconf – Delhi

8. ACREX – Mumbai

9. Racon – Kolkata

Save Energy with Radiant Cooling

The growing economy of India causes a rapid increase in energy 2) System makes it possible to use the building mass for buffering a consumption. As a result India is showing a growing demand for new, part of the heat load. By using this buffering capacity it is possible to energy efficient and sustainable solutions to maintain the indoor shift peak loads to a later moment (outside normal office hours). climate. This allows the chiller to be based on a lower cool capacity.

Radiant floor cooling can make a contribution to this demand. With 3) The additional air conditioning system needs to be designed for the radiant floor cooling it is possible to obtain large energy savings in a latent cooling load only (if radiant floor cooling capacity is sufficient relatively simple and inexpensive manner. for the sensible cooling load).

I strongly believe that the radiant cooling concept will be a way to create This means that the required air volume that has to be brought in to a more comfort, less energy consuming -and therefore more the building will be reduced significantly (rather based on sustainable solution- to maintain the indoor climate. ventilation needs). The energy consumption of air handling units

(fans) will be reduced drastically. Radiant floor cooling can be applied in every building, ranging from small domestic properties to large commercial premises such as 4) With radiant floor cooling systems most of the heat is absorbed by apartment buildings, hotels, office buildings and universities. radiation.

The perceived room temperature is equal to: average radiant What is under floor cooling? temperature +room air temperature/ 2.

Under floor cooling makes use of the building floors/ceilings surfaces Without radiant cooling the average radiant temperature will for the heat exchange with the adjacent spaces. normally be approximately 1 K higher as the room air temperature.

Due to the large surface area which is here by used, it is possible to do With a lower average radiation temperature the room air this at a low temperature differences between space and the floor / temperature can be maintained higher while the perceived room ceiling surface. temperature stays the same.

The heat exchange takes place for about 70% through radiation and By using a higher to maintain room temperature in the designing about 30% through convection. stage the maximum cooling load of a building will decline.

Cooled water is pumped through special plastic hoses incorporated in How big the total energy savings will be depends for a significant part the floors/ceilings. In this manner the mass of the floors / ceilings are on the quality of the used control system.brought to a certain temperature. The applied control system must be able to make predictions about the The tubes are mounted in the floor construction and, by means of a dynamic response of the building and use these to optimize the set manifold located in the vicinity of the floor field, connected to the points.distribution system from the chiller. By using measurements of the past (self-learning ability), the control

system will increasingly be able to predict system reactions and use System types these to change set points.There are basically two types of under floor radiant cooling systems. A building management system will be needed to control all

installations in the most energy-efficient way.The first type delivers the cooling by using the screed (finishing) layer of the floors. This type will be able to generate about 40 W/m2 (12,7 BTU/h per sqft) cool capacity. Facts about Radiant CoolingThe second type delivers the cooling by using the complete building Advantagesmass of floors and ceilings. Tubes are placed in the concrete slabs • Reduction of cool capacity up to 50% by using the heat storage during the building stage. This type will be able to generate about 70 capacity of the building mass.W/m2 (22,2 BTU/h per sqft) cool capacity.

• Significant energy savings (30–50%) by using high temperature water and a smaller ventilation system.Chilled screed

• Ventilation system can become much smaller (Design ventilation Radiant cooling from the screed can be delivered to a space from the for occupancy rather than to offset heat gain). Needed fan power floor. Since most radiant heating systems tend to be in the floor it is will be reduced significantly (up to 90%).possible to use the same circulation system for cooling.

• Buffering capacity. Peak loads that are reduced as a result of Because the screed layer has a relatively low mass the surface thermal energy storage in the panel structure, exposed walls and temperature can be controlled making it possible to use this system for partitionsre-adjustments based on room temperature.

• Occupant thermal comfort can be achieved with warmer interior air temperatures than with air based cooling systems. Caused by the Chilled slabshigher radiant temperature of the surrounding surfaces.

Radiant cooling from a slab is delivered to a space from the floor and • Capacity adapts to cooling demand (if temperature difference

ceiling. Delivering cooling from the ceiling has several advantages. between cooled surface and room changes the radiant system will

First, it is easier to leave ceilings exposed to a room than floors, automatically reduce or increase in cool capacity) .increasing the effectiveness of thermal mass. Floors offer the

• Flexible room classificationdownside of coverings and furnishings that decrease the effectiveness

• No visible componentsof the system. • Silent cooling, no noise from fans or blower.Second, greater convective heat exchange occurs through a chilled

ceiling as warm air rises, leading to more air coming in contact with the • No cold draughtcooled surface.

Cooling delivered through the floor will have the biggest effect when there is a high amount of solar gains from sun penetration. A cooled floor can more easily remove these loads than the ceiling. Chilled slabs, compared to screeds, have more thermal mass and therefore can take better advantage of outside diurnal temperatures swings (more storage capacity for peak load shifting).

Because of the higher thermal mass this system can not be used for re-adjustments based on room temperature. Surface temperatures will respond to slow on changing water flow.

Energy savingsEnergy savings can be achieved by making use of the following system characteristics of radiant floor cooling installations:

1) System uses high temperature water. COP (Coefficient off Performance) of cold water chiller will be significant better. For every electrical kW you will get more cool capacity.

By: Rob Bastinck, Director of WTH

ISHRAE President Mr. S.K. Choudhary Giving Diploma certificates to IIE

Student during the Award Function

1. The 13th Batch of Advance Diploma Course completed in 5. IIE has conducted a workshop on “Fundamentals of

the Month of July 2012. Most of the students have been Applied Psychrometry” by Dr. A.K.Saluja on 7th July 2012,

placed in the industry already. at Qutub Hotel Delhi. It was highly appreciated by all the

Participants. 36 professionals from different industries had 2. 14th Batch for Advance Diploma Course is starting from attended the workshop. Dr. R.K Sharma, Director, NHB has August 2012. Admissions are open. Interested candidates also attended the workshop and distributed certificates to can contact at below mentioned email address or can visit all the participants. Both the workshop were inaugurated by our website.Mr. Sunil Kher president DCI. The programme was

3. IIE Distance learning Programme in HVAC&R for working coordinated by Mr. V.K.Seth and IIE Team.

professionals is getting popular overseas as well as in India. 6. IIE Delhi organized Diploma Award Function for its passed Admissions for distance learning are available anytime.

out students along with DCI, CWC installation on 2nd April.4. IIE has conducted a workshop on “Chilled Water System

Design for Large Commercial Buildings” by Mr. Ajay Raj email : ierf05@gmail.com,

(Consulting Engineer) on 19th May 2012, at Qutub Hotel website : www.ierfeducation.org

Delhi. About 40 participants attended the workshop from

NCR as well as from various other cities’.

IIE, Delhi Activities

DCI President Mr. Sunil Kher inaugurating the Workshop

on Psychrometry

DR. A K SALUJA Conducting workshop on fundamental of

Applied Psychrometry

Upcoming EventsPlease take note of the following upcoming events organised by DCI and its sub-

chepters. Please lookout for more information which will be dissemnated closer to the

events. The Twitter editorial team urges all members to take advantage of most, if not all

of these events, especially the mega conference ACRECONF. Watch out for their

special rate offer on the back page of this issue.

• Workshop on Duct Design and Air distribution - 1st Sept’ 2012

• Product Presentation - 14th Sept’ 2012

• ACRESERVE Agra - 6th Oct’ 2012

• URJAVARAN Dehradun - 13th Oct’ 2012

• ACRESERVE Meerut -30th Nov’ 2012

• URJAVARAN Lucknow - 15th Dec’ 2012

Proposed Topics for workshop

• Challenges of Refrigerants Phase Out

• Integration of DG Set Security Fire Alarm and other Building Services Integrated

BMS System

• Data Centers

• Hospital & Healthcare

• BIM

Upcoming NationalEvents

1. Refconf – Chennai

2. Techfest – Goa

3. ACR Trendz – Pune

4. Ventconf – Kolkata

5. Confluence – Ahmedabad

6. EEHVAC&R – Ranchi

7. Acreconf – Delhi

8. ACREX – Mumbai

9. Racon – Kolkata

Save Energy with Radiant Cooling

The growing economy of India causes a rapid increase in energy 2) System makes it possible to use the building mass for buffering a consumption. As a result India is showing a growing demand for new, part of the heat load. By using this buffering capacity it is possible to energy efficient and sustainable solutions to maintain the indoor shift peak loads to a later moment (outside normal office hours). climate. This allows the chiller to be based on a lower cool capacity.

Radiant floor cooling can make a contribution to this demand. With 3) The additional air conditioning system needs to be designed for the radiant floor cooling it is possible to obtain large energy savings in a latent cooling load only (if radiant floor cooling capacity is sufficient relatively simple and inexpensive manner. for the sensible cooling load).

I strongly believe that the radiant cooling concept will be a way to create This means that the required air volume that has to be brought in to a more comfort, less energy consuming -and therefore more the building will be reduced significantly (rather based on sustainable solution- to maintain the indoor climate. ventilation needs). The energy consumption of air handling units

(fans) will be reduced drastically. Radiant floor cooling can be applied in every building, ranging from small domestic properties to large commercial premises such as 4) With radiant floor cooling systems most of the heat is absorbed by apartment buildings, hotels, office buildings and universities. radiation.

The perceived room temperature is equal to: average radiant What is under floor cooling? temperature +room air temperature/ 2.

Under floor cooling makes use of the building floors/ceilings surfaces Without radiant cooling the average radiant temperature will for the heat exchange with the adjacent spaces. normally be approximately 1 K higher as the room air temperature.

Due to the large surface area which is here by used, it is possible to do With a lower average radiation temperature the room air this at a low temperature differences between space and the floor / temperature can be maintained higher while the perceived room ceiling surface. temperature stays the same.

The heat exchange takes place for about 70% through radiation and By using a higher to maintain room temperature in the designing about 30% through convection. stage the maximum cooling load of a building will decline.

Cooled water is pumped through special plastic hoses incorporated in How big the total energy savings will be depends for a significant part the floors/ceilings. In this manner the mass of the floors / ceilings are on the quality of the used control system.brought to a certain temperature. The applied control system must be able to make predictions about the The tubes are mounted in the floor construction and, by means of a dynamic response of the building and use these to optimize the set manifold located in the vicinity of the floor field, connected to the points.distribution system from the chiller. By using measurements of the past (self-learning ability), the control

system will increasingly be able to predict system reactions and use System types these to change set points.There are basically two types of under floor radiant cooling systems. A building management system will be needed to control all

installations in the most energy-efficient way.The first type delivers the cooling by using the screed (finishing) layer of the floors. This type will be able to generate about 40 W/m2 (12,7 BTU/h per sqft) cool capacity. Facts about Radiant CoolingThe second type delivers the cooling by using the complete building Advantagesmass of floors and ceilings. Tubes are placed in the concrete slabs • Reduction of cool capacity up to 50% by using the heat storage during the building stage. This type will be able to generate about 70 capacity of the building mass.W/m2 (22,2 BTU/h per sqft) cool capacity.

• Significant energy savings (30–50%) by using high temperature water and a smaller ventilation system.Chilled screed

• Ventilation system can become much smaller (Design ventilation Radiant cooling from the screed can be delivered to a space from the for occupancy rather than to offset heat gain). Needed fan power floor. Since most radiant heating systems tend to be in the floor it is will be reduced significantly (up to 90%).possible to use the same circulation system for cooling.

• Buffering capacity. Peak loads that are reduced as a result of Because the screed layer has a relatively low mass the surface thermal energy storage in the panel structure, exposed walls and temperature can be controlled making it possible to use this system for partitionsre-adjustments based on room temperature.

• Occupant thermal comfort can be achieved with warmer interior air temperatures than with air based cooling systems. Caused by the Chilled slabshigher radiant temperature of the surrounding surfaces.

Radiant cooling from a slab is delivered to a space from the floor and • Capacity adapts to cooling demand (if temperature difference

ceiling. Delivering cooling from the ceiling has several advantages. between cooled surface and room changes the radiant system will

First, it is easier to leave ceilings exposed to a room than floors, automatically reduce or increase in cool capacity) .increasing the effectiveness of thermal mass. Floors offer the

• Flexible room classificationdownside of coverings and furnishings that decrease the effectiveness

• No visible componentsof the system. • Silent cooling, no noise from fans or blower.Second, greater convective heat exchange occurs through a chilled

ceiling as warm air rises, leading to more air coming in contact with the • No cold draughtcooled surface.

Cooling delivered through the floor will have the biggest effect when there is a high amount of solar gains from sun penetration. A cooled floor can more easily remove these loads than the ceiling. Chilled slabs, compared to screeds, have more thermal mass and therefore can take better advantage of outside diurnal temperatures swings (more storage capacity for peak load shifting).

Because of the higher thermal mass this system can not be used for re-adjustments based on room temperature. Surface temperatures will respond to slow on changing water flow.

Energy savingsEnergy savings can be achieved by making use of the following system characteristics of radiant floor cooling installations:

1) System uses high temperature water. COP (Coefficient off Performance) of cold water chiller will be significant better. For every electrical kW you will get more cool capacity.

By: Rob Bastinck, Director of WTH

ISHRAE President Mr. S.K. Choudhary Giving Diploma certificates to IIE

Student during the Award Function

• Reduction in transfer of dust and air-born allergies

• No low water temperatures required.

• Uniform temperature distribution (large area for heat exchange).

• System still works for some time during a power cut.

• Pipes embedded in the floor are maintenance free

• Suitable for various floor constructions

• Highly economical. Radiant cooling appears to have lower first costs and lifecycle costs compared to conventional systems.

• Ventilation is still necessary to address the latent load and bring in the required refresh air. However the ducts can be smaller which saves structural height

• Less condensate drains necessary

• Room air temperature can be designed 1 to 1,5 C higher because the convective part off the cooling load becomes smaller.

• Same tubes can also be used for heating.

DisadvantagesLess fans, ducts and grilles to maintain.

• The latent loads (humidity) from occupants, infiltration and + A radiant floor cooling system is quiet. No sound from fans, ducts or processes generally need to be managed by an independent grilles.ventilation system.

+ Helps in earning Green Rating Points• Condensation caused by humidity is a limiting factor for the cooling

+ Warranty on the used tubes: 50 years.capacity of a radiant cooling system. The surface temperature + Because there is less air circulation there is less risk of draft should not be equal or below the dew point temperature in the

complaintsspace.

An air temperature of 26°C (79°F) would mean a dew point Limitations in the application of radiant floor cooling between 17°C and 20°C (63°F and 68°F). If floor/ceiling surface

temperature will be kept above 20 °C (68°F) theoretically systemscondensation is not possible. Since we can not be sure that the air - Radiant floor cooling can only be applied if condensation on the temperature will always be 26°C (79°F) or lower relative humidity cold floors and ceilings can be excluded. The humidity in the should be monitored or controlled. building has to be controlled and monitored by a additional air

• Less useful with rapidly changing conditions. Slower reaction time conditioning system. to temperature changes. Floor temperature needs to be kept higher than the dew point

temperature at design room conditions (temperature and relative Other benefits and potential savings of floor cooling humidity).systems - Radiant floor cooling can only absorb sensible heat load. For the

latent load and to bring in the required ventilation an additional air + No visible parts.conditioning system remains necessary.+ Using a large surface for the heat exchange is a more comfortable

- The cool capacity of radiant floor cooling is not unlimited. If the way to maintain the indoor climate. No large temperature applied floor temperature is to low it can cause cold complaints differences in a room. (cold feet) and increases the risk of condensation.+ Installation will still deliver cool capacity for some time at power

- Re-adjustment of a room or space temperature is most often not failures (due to heat storage capacity cooled building mass).possible (only if tubes are placed in light screeds). If a room or + Space-saving. Because the needed air conditioning system is space temperature has to be re-adjusted this should take place reduced in size there is less space needed for ducts and grilles. If through a separate air conditioning system. Floor surface the ceiling surface is also used for radiant cooling a false ceiling temperature responds to slow when water flow through the tubes is cannot be used.changed to control the room air temperature.

+ Cooling capacity floor cooling automatically adapts to changing - When radiant floor cooling is applied there are requirements for the conditions.

floor and/or ceiling finishing layer. The used finishing layer needs to As the room temperature increases the difference between the have a good heat conduction.floor and the room temperature becomes larger and causes the

- Extra attention is needed for noise abatement measures that may floor to absorb more heat.be necessary by the absence of a suspended ceiling.

If the room temperature drops the temperature difference between - A TAC system usually has to operate continuously to maintain the the floor and the room will become smaller and causes the floor to

building mass at a certain temperature level. Because of the absorb less heat.slowness of this system it would take too much time to maintain the

+ Because higher water temperatures are used there are possible desired building mass temperature after a business interruption. savings in the costs for installing vapor-tight insulation and There will not be much energy required to maintain this condensation drains. temperature since there is only a small heat load present outside

+ Tubes embedded in the construction require no maintenance. normal business hours.

Rob Bastinck, Director of WTH Radiant Cooling and Heating Systems www.wthindia.com

Rob Bastinck, based in The Netherlands, has an extensive experience in engineering with large international

companies. He holds a BS degree in electrical engineering. With a career background in electrical engineering,

manufacturing, sales and international business, Rob Bastinck is heading up the highly successful WTH organization.

WTH is the market leader in radiant cooling and heating systems for new construction and renovation of buildings.

For more than 40 years WTH is engaged in development, production, engineering and installation of systems that

contribute to low energy consumption and sustainable comfort. During this period it has installed more than 10.000

installations in various buildings from high rise apartment blocks, hotels, schools/universities, stadiums to large office

buildings.

WTH Netherlands is the market leader in the Netherlands when it comes to radiant under floor heating and –cooling

installations. WTH started in 1970 and is dedicated to radiant cooling and –heating only. With over 10000 projects

being installed WTH has gained a lot of experience and know how about the radiant cooling and – heating concept.

WTH INDIA (P) LTD., is a Joint-venture with WTH B.V. from The Netherlands, which is part of the TBI Holdings,

employing 9000 persons with an annual Euro 2 billion turnover.

About the Author

• Reduction in transfer of dust and air-born allergies

• No low water temperatures required.

• Uniform temperature distribution (large area for heat exchange).

• System still works for some time during a power cut.

• Pipes embedded in the floor are maintenance free

• Suitable for various floor constructions

• Highly economical. Radiant cooling appears to have lower first costs and lifecycle costs compared to conventional systems.

• Ventilation is still necessary to address the latent load and bring in the required refresh air. However the ducts can be smaller which saves structural height

• Less condensate drains necessary

• Room air temperature can be designed 1 to 1,5 C higher because the convective part off the cooling load becomes smaller.

• Same tubes can also be used for heating.

DisadvantagesLess fans, ducts and grilles to maintain.

• The latent loads (humidity) from occupants, infiltration and + A radiant floor cooling system is quiet. No sound from fans, ducts or processes generally need to be managed by an independent grilles.ventilation system.

+ Helps in earning Green Rating Points• Condensation caused by humidity is a limiting factor for the cooling

+ Warranty on the used tubes: 50 years.capacity of a radiant cooling system. The surface temperature + Because there is less air circulation there is less risk of draft should not be equal or below the dew point temperature in the

complaintsspace.

An air temperature of 26°C (79°F) would mean a dew point Limitations in the application of radiant floor cooling between 17°C and 20°C (63°F and 68°F). If floor/ceiling surface

temperature will be kept above 20 °C (68°F) theoretically systemscondensation is not possible. Since we can not be sure that the air - Radiant floor cooling can only be applied if condensation on the temperature will always be 26°C (79°F) or lower relative humidity cold floors and ceilings can be excluded. The humidity in the should be monitored or controlled. building has to be controlled and monitored by a additional air

• Less useful with rapidly changing conditions. Slower reaction time conditioning system. to temperature changes. Floor temperature needs to be kept higher than the dew point

temperature at design room conditions (temperature and relative Other benefits and potential savings of floor cooling humidity).systems - Radiant floor cooling can only absorb sensible heat load. For the

latent load and to bring in the required ventilation an additional air + No visible parts.conditioning system remains necessary.+ Using a large surface for the heat exchange is a more comfortable

- The cool capacity of radiant floor cooling is not unlimited. If the way to maintain the indoor climate. No large temperature applied floor temperature is to low it can cause cold complaints differences in a room. (cold feet) and increases the risk of condensation.+ Installation will still deliver cool capacity for some time at power

- Re-adjustment of a room or space temperature is most often not failures (due to heat storage capacity cooled building mass).possible (only if tubes are placed in light screeds). If a room or + Space-saving. Because the needed air conditioning system is space temperature has to be re-adjusted this should take place reduced in size there is less space needed for ducts and grilles. If through a separate air conditioning system. Floor surface the ceiling surface is also used for radiant cooling a false ceiling temperature responds to slow when water flow through the tubes is cannot be used.changed to control the room air temperature.

+ Cooling capacity floor cooling automatically adapts to changing - When radiant floor cooling is applied there are requirements for the conditions.

floor and/or ceiling finishing layer. The used finishing layer needs to As the room temperature increases the difference between the have a good heat conduction.floor and the room temperature becomes larger and causes the

- Extra attention is needed for noise abatement measures that may floor to absorb more heat.be necessary by the absence of a suspended ceiling.

If the room temperature drops the temperature difference between - A TAC system usually has to operate continuously to maintain the the floor and the room will become smaller and causes the floor to

building mass at a certain temperature level. Because of the absorb less heat.slowness of this system it would take too much time to maintain the

+ Because higher water temperatures are used there are possible desired building mass temperature after a business interruption. savings in the costs for installing vapor-tight insulation and There will not be much energy required to maintain this condensation drains. temperature since there is only a small heat load present outside

+ Tubes embedded in the construction require no maintenance. normal business hours.

Rob Bastinck, Director of WTH Radiant Cooling and Heating Systems www.wthindia.com

Rob Bastinck, based in The Netherlands, has an extensive experience in engineering with large international

companies. He holds a BS degree in electrical engineering. With a career background in electrical engineering,

manufacturing, sales and international business, Rob Bastinck is heading up the highly successful WTH organization.

WTH is the market leader in radiant cooling and heating systems for new construction and renovation of buildings.

For more than 40 years WTH is engaged in development, production, engineering and installation of systems that

contribute to low energy consumption and sustainable comfort. During this period it has installed more than 10.000

installations in various buildings from high rise apartment blocks, hotels, schools/universities, stadiums to large office

buildings.

WTH Netherlands is the market leader in the Netherlands when it comes to radiant under floor heating and –cooling

installations. WTH started in 1970 and is dedicated to radiant cooling and –heating only. With over 10000 projects

being installed WTH has gained a lot of experience and know how about the radiant cooling and – heating concept.

WTH INDIA (P) LTD., is a Joint-venture with WTH B.V. from The Netherlands, which is part of the TBI Holdings,

employing 9000 persons with an annual Euro 2 billion turnover.

About the Author

DCI has taken an initiative of Mass

mailing to help market various Industry

events. The mail will be circulated to all

ISHRAE members and other industry databases, like:

Hotels, Hospitals, Pharma, Architects, Builders,

Consultants, Contractors, PMC's, Data Centers & Cold

Chain.

Delhi Chapter of ISHRAE has a strong and authentic

database of more than 250,000 email addresses.

Many organisations have already availed our services and

they have received positive responses and commercial

success.

The charges for mass mailing are as under :

` 10,000/- per round

If you opt for 12 rounds of mailers in a year we shall offer 2

additional rounds complimentary.

For 24 rounds in a year, we shall offer 6 additional rounds.

* Service tax extra.

For further information you may contact Chapter

Secretariat.

The National Board of Governors of ISHRAE

have decided to collect a Sustenance Fees of

Rs. 2,250/- for 3 years (Rs. 750 per annum) w.e.f.

1st April’ 2012 from all Life Members enrolled prior

to Sept’ 2000. The same amount will be

contributed by Members enrolled from Oct’ 2000

onwards. This has essentially been necessitated

to off balance resources crunch and sustain the

deliverables to members.

All members are advised to forward sustenance/

Renewal Fees payable to “ISHRAE

HEADQUARTERS” in below address:

502, DDA Building, District Center, Laxmi Nagar,

Delhi - 110092, Tel: 011-43001814, 22540537

E-mail : dcishrae@airtelmail.in

List of ISHRAEPublications

Mass Mailing Renewal & Sustenance

1500

Classifieds :

Editor'sCorner

For buy your copies, kindly contact Chapter Secretariat.

S.No. Publication Name

Member Non-member

1 Handbook HVAC 400 450

2 Handbook Refrigeration 400 450

3 Handbook Ventilation 450 500

4 Installation Guide 500 600

5 Fundamentals of Refrigeration 90 100

6 Fundamentals of Air-conditioning 90 100

7 Fundamentals of Fan Engineering 90 100

8 Fundamentals of Cold Storages 90 100

9 Acredex Directory 2009 cd (V-1.0) 500 550

10 All About AHU's (Air Handling Unit) 90 100

11 Chiller Basic 90 100

12 All About Insulation 90 100

Price

DCI has taken an initiative of Mass

mailing to help market various Industry

events. The mail will be circulated to all

ISHRAE members and other industry databases, like:

Hotels, Hospitals, Pharma, Architects, Builders,

Consultants, Contractors, PMC's, Data Centers & Cold

Chain.

Delhi Chapter of ISHRAE has a strong and authentic

database of more than 250,000 email addresses.

Many organisations have already availed our services and

they have received positive responses and commercial

success.

The charges for mass mailing are as under :

` 10,000/- per round

If you opt for 12 rounds of mailers in a year we shall offer 2

additional rounds complimentary.

For 24 rounds in a year, we shall offer 6 additional rounds.

* Service tax extra.

For further information you may contact Chapter

Secretariat.

The National Board of Governors of ISHRAE

have decided to collect a Sustenance Fees of

Rs. 2,250/- for 3 years (Rs. 750 per annum) w.e.f.

1st April’ 2012 from all Life Members enrolled prior

to Sept’ 2000. The same amount will be

contributed by Members enrolled from Oct’ 2000

onwards. This has essentially been necessitated

to off balance resources crunch and sustain the

deliverables to members.

All members are advised to forward sustenance/

Renewal Fees payable to “ISHRAE

HEADQUARTERS” in below address:

502, DDA Building, District Center, Laxmi Nagar,

Delhi - 110092, Tel: 011-43001814, 22540537

E-mail : dcishrae@airtelmail.in

List of ISHRAEPublications

Mass Mailing Renewal & Sustenance

1500

Classifieds :

Editor'sCorner

For buy your copies, kindly contact Chapter Secretariat.

S.No. Publication Name

Member Non-member

1 Handbook HVAC 400 450

2 Handbook Refrigeration 400 450

3 Handbook Ventilation 450 500

4 Installation Guide 500 600

5 Fundamentals of Refrigeration 90 100

6 Fundamentals of Air-conditioning 90 100

7 Fundamentals of Fan Engineering 90 100

8 Fundamentals of Cold Storages 90 100

9 Acredex Directory 2009 cd (V-1.0) 500 550

10 All About AHU's (Air Handling Unit) 90 100

11 Chiller Basic 90 100

12 All About Insulation 90 100

Price