Heat Interface Units

COMMUNAL HEATING SCHEMESSolutions for

with

inside

• OneHIUfitsall(5-70kW)–usingspecializedcontrolvalves• Upgradefacilitieswithsimpleinterchangeableunits• Intelligentcontrollersgiveefficientprimarycontrolandplatepre-heatforfasterresponse.• EsbeTMVforenhancedDHWusercomfort• Qualitybrands–Grundfos,ESBE,SWEP• Designedforeasymaintenance• Fullyinsulated• Nogassupplyrequiredtoindividualapartments• Reducedinstallationandlifecyclecosts• Lowermaintenance• Greaterenergyefficiency

A primary consideration in modern construction is increased energy efficiency, user comfort and energy billing – particularly in multi-dwelling buildings.

As a result Centralised District Heating schemes, supplied by a combination of traditional and renewable energy sources, are becoming widely accepted as the industry norm for new build developments.

ESBE Controlled Heat Interface Units give Consultants and Engineers a reliable solution which provide eco-friendly, efficient temperature control whilst achieving high energy efficiency and user comfort.

Essco Controls offer Heat Interface Units (HIUs) for a variety of applications – whether for single or multi-dwelling houses, apartments, industrial, commercial or within district heating systems.

The HIU unit provides a single point of control which delivers improved efficiency and reduced effective running costs. These compact units are designed to fit in very small spaces, with minimal installation and running costs. Systems can be fitted with wireless control and weather compensating modulation providing additional control.

What is a Heat Interface Unit?

Leisure

Commercial

Domestic

Industrial

Benefits of ESBE Controlled HIUs include:

D O M E S T I C C O M M E R C I A L L E I S U R E I N D U S T R I A L

with

inside

Heat Interface Units (HIUs) provide the complete solution for your heating and hot water on a heat network.

Cost efficient solutions for multi-dwelling developments

2

HIU

HIU

HIU

HIU

THE ENERGY CENTRE

HIU HIU

Typical multi-dwelling development

Leisure

Commercial

Domestic

Industrial

The energy centre provides one heat source for all individual apartments and flats which reduces energy costs and the carbon footprint.

• Accurateconsumptionandrunningcostsareprovided

•Annualservicingcostsreducedsignificantly

•Reducedgasconsumption

•InstantaneousDHWisachievedusing temperatureregulation

•Additionalwirelesscontrol optionsavailable

with

inside

3

I N D I R E C T T W I N H I UESS-TWIN

Options

HydronicseparationbetweenprimaryandsecondarysystemInstantaneousHeatingandDHWfromplateheatexchangers12lexpansionvesselElectronicandthermostaticcontrolofDHW–HighFlowratesDifferentialpressurecontrolasstandardCopperbrazedAISI316stainlesssteelplateheatexchanger doesnotrequiremaintenance.AISI316stainlesssteelpipingpreventsanycorrosion.Easytoinstallandoperate.Uniquecombinationoffastactinghighflowelectroniccontrol ofDHWwithsecondaryTMVtogivestabletemperatureoutput

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Min working pressure DHWMax working temperatureConnections

5-70kW10 Bar3 Bar2 Bar95°C¾” BSP Insulated Pipe

Indirect Twin HIU

4

✆ +44 (0) 1489 779068✉ sales@esscocontrols.co.uk

A Central Heating SupplyB Central Heating ReturnC Domestic Cold Water InletD Domestic Cold Water OutletE Domestic Hot WaterF Space Heating SupplyG Space Heating Return

Hydronic Scheme

C O N T R O L S

ESSCOESSCO

No Components1A Heat Exhanger (DHW)1B Heat Exchanger (Heating)5 Differential Pressure Controller7 5 Way Distributor + Strainer8 Water Meter9 Heat Meter20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34A CRS Controller34B CRA ControllerPG Pressure GaugePS Pressure Switch10 Mixing Valve

5

I N D I R E C T T W I N H I UECO-TWIN

750

570

65 60 60 60 100 67 67 90

3/4'' 3/4'' 3/4'' 3/4'' 3/4'' 3/4'' 3/4''D E C A B G F 182

338

D

E

F

C

1 2 3 4

B

A

321 5

C

D

4 6 7 8

A

B

SHEET 1 OF 4SCALE:1:10

Proje Ismi/Project NameY.BİRİCİK

Tarih/DateAdı/NameS.OZTURK

Onay/Appv'd

İmza/Sgn

A

DE

BC

FG

Kontrl/Chk'd E.CELTEK

Central Heating SupplyCentral Heating Return

Domestic Cold Water OutletDomestic Hot WaterSpace Heating SupplySpace Heating Return

Domestic Cold Water Inlet

REV No:

Proje No.Kapasite/Cap.

Çizen/Drawn

OEM2

Rev:00

20151127-0127.11.201527.11.201527.11.2015

20151127-01

Options

Costeffectivesolutionwhilststillgivingincreased functionalityonHeatingcircuit-i.e.optionalpreheat, weathercompensationandprepaymentHydronicseparationbetweenprimaryandsecondarysystem InstantaneousHeatingandDHWfromplateheatexchangers 12lexpansionvessel ElectroniccontrolofHeatingwithfullmodulationand thermostaticcontrolofDHWDifferentialpressurecontrolasstandard CopperbrazedAISI316stainlesssteelplateheatexchanger doesnotrequiremaintenance. AISI316stainlesssteelpipingpreventsanycorrosion. Easytoinstallandoperate.HighFlowsecondaryTMVgivesstabletemperature outputandfailsafeaction.

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Min working pressure DHWMax working temperatureConnections

5-60kW10 Bar3 Bar2 Bar95°C¾” BSP Insulated Pipe

Indirect Twin HIU

6

✆ +44 (0) 1489 779068✉ sales@esscocontrols.co.uk

Exp. Tank

23

9

24

1B

25

E

A

FG

B

C

1A

D

8

5

İ İ İ

M

34B

7

1A.Heating Exhanger (DHW)1B.Heat Exhanger (Heating)

5.Differential Pressure Controller7.5Way Distributor + Strainer8.Water Meter9.Heat Meter

20. Heating Circulation Pump23.Safety Valve24.Strainer25.Expansion Tank

34B.CRA Controller

20

PS.Pressure Sensor

PS

24

T

M T

42. 3Way Mixing Valve

42

T3

3.Thermostatic ControllerA Central Heating SupplyB Central Heating ReturnC Domestic Cold Water InletD Domestic Cold Water OutletE Domestic Hot WaterF Space Heating SupplyG Space Heating Return

Hydronic Scheme

C O N T R O L S

ESSCOESSCO

No Components1A Heat Exhanger (DHW)1B Heat Exchanger (Heating)3 Thermostatic Controller5 Differential Pressure Controller7 5 Way Distributor + Strainer8 Water Meter9 Heat Meter20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34B CRA Controller42 3 Way Mixing ValvePG Pressure Switch

7

I N D I R E C T S I N G L E H I UESS-SINGLE

Indirect Single HIU

34B

9

25

24

23

5PS

20

1B

21

PG

NO Components1B Heat Exhanger(Heating)5 Differential Pressure Control Valve9 Heat Meter 20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34B CRA Controller PG Pressure GaugePS Pressure Switch

D

E

F

C

1 2 3 4

B

A

321 5

C

D

4 6 7 8

A

B

SHEET 2 OF 4SCALE:1:10

Project NameF.BERK

DateNameM.AKSU

Appv'd

Sgn

ABFG

Chk'd M.AKSU15.07.2016

Central Heating SupplyCentral Heating ReturnSpace Heating SupplySpace Heating Return

REV No:

Proje No.Cap.

Drawn

150701-02 150701-02

Rev:015.07.201615.07.2016

150701-02

Options

HydronicseparationbetweenprimaryandsecondarysystemInstantaneousHeatingfromplateheatexchangers12lexpansionvesselElectroniccontrol–HighFlowratesDifferentialpressurecontrolasstandardCopperbrazedAISI316stainlesssteelheatexchanger doesnotrequiremaintenance.AISI316stainlesssteelpipingpreventsanycorrosion.Easytoinstallandoperate.

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Max working temperatureConnections

60kW10 Bar3 Bar95°C¾” BSP Insulated Pipe

D O M E S T I C C O M M E R C I A L L E I S U R E I N D U S T R I A L

8

✆ +44 (0) 1489 779068✉ sales@esscocontrols.co.uk

İ İ İ

ı İ

5

ExpansionTank

FG

23

20

1B25

AB

1B.Heat Exchanger(Heating)5.Differential Pressure Controller

12.Thermal Actuator

23.Safety Valve

20.Heating Circulation Pump

25.Expansion

OEM2

9

9.Heat Meter

T

21.Check Valve

24

24.Strainer

M

34B

PS

24

34B.CRA ControllerPG.Pressure GaugePS.Pressure Sensor

20150701-02

C O N T R O L S

ESSCOESSCO

Hydronic Scheme

A Central Heating SupplyB Central Heating ReturnF Space Heating SupplyG Space Heating Return

No Components1B Heat Exhanger (Heating)5 Differential Pressure Control Valve9 Heat Meter20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34B CRA ControllerPG Pressure GaugePS Pressure Switch

9

I N D I R E C T H E A T I N G W I T H D H W C Y L I N D E RESS-CYLINDER

Indirect Heating - Direct DHW to Cylinder

Options

HydronicseparationbetweenprimaryandsecondarysystemInstantaneousHeatingCylinderteeoffafterheatmeterallowingaccuratebillingof DHWinretrofitapplicationsorwhenbuffertanksareinstalled12lexpansionvesselRangeofinterchangeableControllersforHeatingDifferentialpressurecontrolasstandardCopperbrazedAISI316stainlesssteelplateheatexchanger doesnotrequiremaintenance.AISI316stainlesssteelpipingpreventsanycorrosion.Easytoinstallandoperate

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Min working pressure DHWMax working temperatureConnections

60kW10 Bar3 Bar2 Bar95°C¾” BSP Insulated Pipe

D O M E S T I C C O M M E R C I A L L E I S U R E I N D U S T R I A L

No Components1B Heat Exhanger (Heating)4 Zone Valve9 Heat Meter20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34B CRA ControllerPG Pressure GaugePS Pressure Sensor

10

C O N T R O L S

ESSCOESSCO

✆ +44 (0) 1489 779068✉ sales@esscocontrols.co.uk

A Central Heating SupplyB Central Heating ReturnC DHW Cylinder SupplyD DHW Cylinder ReturnF Space Heating SupplyG Space Heating Return

Hydronic Scheme

11

I N D I R E C T D H W W I T H D I R E C T H E A T I N GESS-DIRECT

Indirect DHW - Direct Heating

Options

HydronicseparationbetweenprimaryandsecondarysystemInstantaneousHeatingdirectlyfromtheprimarysupply allowinggreaterenergysavingsandefficiencyIdealfornewbuildapplicationsRangeofinterchangeableControllersforHeatingDifferentialpressurecontrolasstandardCopperbrazedISI316stainlesssteelplateheat exchangerdoesnotrequiremaintenance.AISI316stainlesssteelpipingpreventsanycorrosion.Easytoinstallandoperate

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Min working pressure DHWMax working temperatureConnections

5-70kW10 Bar3 Bar2 Bar95°C¾” BSP Insulated Pipe

D O M E S T I C C O M M E R C I A L L E I S U R E I N D U S T R I A L

No Components1A Heat Exchanger (DHW)8 Water Meter-Optıonal9 Heat Meter5 Differential Pressure24 Strainer34A CRS Controller34B CRA ControllerAV Air Vent10 Mixing Valve

12

C O N T R O L S

ESSCOESSCO

Hydronic Scheme

A Central Heating SupplyB Central Heating ReturnC Domestic Cold Water InletD Domestic Cold Water OutletE Domestic Hot WaterF Space Heating SupplyG Space Heating Return

✆ +44 (0) 1489 779068✉ sales@esscocontrols.co.uk

13

HIU Options14

Underfloor Heating

Options

AllversionsavailablewithintegratedUFHmanifoldsReducesoverallinstalltimeandcostEliminatesrequirementforadditionalpumpandAreaControl Pack–IntegratedEsbeCRAcontrolstheUFHcircuit.Weathercompensationeasilyaddedfortotalcontrol

FirstFixRailcompletewithBypassMBUSHeatMeterMBUSWaterMeterRangeofHeatingcontrollersallowingWeather Compensation,WirelessRoomstatandIndoorsensors.

SpecificationHeat transfer capacityMax working pressure primaryMax working pressure secondary(heating)Max working temperatureConnections

60kW10 Bar3 Bar95°C¾” BSP Insulated Pipe

1A

20

PS

PG

23

21

5

24

25

9

34B

120

0

587

90 65.5 188.5 156

231

A3/4''3/4''

BGFD

E

F

C

1 2 3 4

B

A

321 5

C

D

4 6 7 8

A

B

Renoc Dış Ticaret Ltd. Şti.Heat Office : Kuşbakışı Cad. No.29 A1 Altunizade/İstanbulFactory : Araylar Sanayi Sitesi A9 Tuzla/İstanbulT: +90 216 474 74 11 T: +90 216 304 27 70F: +90 216 474 74 12 F: +90 216 304 27 71

A Central Heating Supply 170214-01 Rev: 0DateName

M.AKSU

Appv'd

Sgn

Chk'd14.02.2017Drawn

F.BERKM.ÖZALP

Client

Project NameCapacity

SCALE: SHEET 1 OF 214.02.201714.02.2017

Central Heating ReturnSpace Heating SupplySpace Heating Return

FG

B

No Components1B Heat Exhanger (Heating)5 Differential Pressure Control Valve9 Heat Meter20 Heating Circulation Pump21 Check Valve23 Safety Valve24 Strainer25 Expansion Tank34B CRA ControllerPG Pressure GaugePS Pressure Switch

HIU Options15

Optiontointegrateandoperatefan-coilcircuitwhilststill allowingsimultaneousflowtotheUFH. AllversionsavailablewithintegratedUFHmanifolds andFancoilcontrolReducesoverallinstalltimeandcostEliminatesrequirementforadditionalpumpandArea ControlPack–IntegratedEsbeCRAcontrols theUFHcircuit.Weathercompensationeasilyaddedfortotalcontrol

1A

20

PS

PG

34A

23

21

5

24

9

25

34B

No Components2H Heat Exchanger (Heating)

3 Strainer

5 Heating Circulation Pump

6 Differantial Pressure Controller

7 Expansion Vessel

9 Heat Meter

10 Thermomanometers

11 Safety valve

20 CRA Controller

21 ARA 600

Underfloor Heating with Fancoil

16

EsbeCRAandCRScontrollersallowfullintegrationofprepaymentoptions HIUcanbeturnedon/offwithouttheneedforadditional2-Portcontrolvalves–reducingcostandsimplifyinginstallation InadditiontheHIUcanbesettoallowreducedtemperaturesorfrostsettinguntilpaymentisreceived. ControlisOpenProtocolsoHIUiscompatiblewithallBillingProviders.

Prepayment Option

HIU Options

Allversionsavailableastopinlet connectionsifrequired (twinversionshown) Givesflexibilityofinstallation forpipework

Firstfitjigsallowpipeinstallationand positioningbeforeinstallingHIU

Integratedby-passandflushingvalve –fullboreandfullyinsulated

Fullboreisolationvalves AvailableforallHIUvariants

Top Entry

First Fix Jig

17

C O M P O N E N T SSmart Systems

C O N T R O L S

ESSCOESSCO

VRG122 2 way Rotary shoe valve

CRS115 – Temperature Controller with pocket sensor

CRA115 – Temperature Controller

Grundfos UPM 3 Pump

CRC115 – Temperature Controller with Weather compensation

ManufacturedfromDZRBrassforlonglastingandhighdurability.Lowestinternalleakagerateonthemarket(<0.05%).Progressiveregulatingcharacteristictogivefullcontrolthroughoutopeningstroke.Customizedcoatedsleeveforhighendurance.ClosecouplingwithEsbeactuatorforaccurateproportionalcontrol

SeriesCRS110isaconstantflowtemperaturecontrollerforapplicationswhereaconstantwatertemperatureisrequired.Temperaturesettingisdonebyaneasy-to-usejoystickanddisplayinterface.ThecompactcontrollerisdesignedforoperatingrotaryvalvesDN15-50andhasanoperatingrangeof90°.Theseriescaneasilybemanuallyoperatedbythepull-and-turnknobonthefrontofthecover.TheCRShasapocketwithaninsertedtemperaturesensorwithaquicktemperatureresponsetosuitpotablewaterapplications.Theactuatorprogrammingcanbealteredtogivefasterresponsetimesfortemperaturevariations.

SeriesCRA110isaconstantflowtemperaturecontrollerforapplicationswhereaconstantwatertemperatureisrequired.Temperaturesettingsisdonebyaneasy-to-usejoystickanddisplayinterface.ThecompactcontrollerisdesignedforoperatingrotaryvalvesDN15-50andhasanoperatingrangeof90°.Theseriescaneasilybemanuallyoperatedbythepull-and-turnknobonthefrontofthecover. Aspeed-controlled,high-efficiencypumpwithinternalcontrolsin

constantpressure,proportionalpressureorconstantspeedmodesdefinedbythemeansofasmartuserinterface.TheUPM3AUTOisforallapplicationsinwhichaninternallycontrolledpumpisneeded.Itisdesignedtobeusedinappliancesorcabinetswithincreasedambienttemperaturesandlimitedspaceoptions;eitherinstandaloneapplicationsorinkitsystemswithoutPWMcontroller.

SeriesCRC110isanoutdoorsensorbasedcontrollerwithintegratedactuatorforuseonmixingvalveslikeVRG122andVRB140.Thecontrollerisdesignedtoprovideahighlevelofcomfortthankstothepossibilitytosetaperfectcharacteristicheatingcurveandatthesametimeprovideenergysavingsforthehouseowner.Theregulationisbasedonoutdoorsensorfeedbackandanadjustablecharacteristicheatingcurve.Anoffset/paralleladjustmentofthecharacteristicheatingcurvemaybeactivatedbyanexternalsignalforexamplenightsettings.Forapplicationswithwellinsulatedbuildingandquickheatingsystemssuchasradiatorcircuitsatemperaturefiltercanbeactivatedtodelayanoutdoortemperaturechangetoavoidanimbalancebetweenestimatedandactualheatingdemand.

HeatMetersareusedtomeasurethedistributionofheatenergyinheatingcontrolsystemsbycalculatingthevolumeandtemperaturedifferentialofcirculatedwaterandcomplywithrequirementsstipulatedinOIMLR75,MID,EN1434standards.TheHeatMeterusedinourHIUshasMBUSfeedbackallowingremoterecordingofenergyusageviaEthernetforbillingpurposes.

Heatmeter

with

inside

with

inside

with

inside

with

inside

Diversity Factor

Typical Diversity FactorsThedegreeofdiversityformultipledwellingsisexpressedasa“coincidencefactor”andisdefinedas:F = DFR / MFRWhere: F= coincidenceordiversityfactorDFR=designflowrateforhot wateroutlets(l/s)MFR=maximumpossibleflowrate forhotwateroutlets(l/s)

Number of HIUs

Number of HIUs

Number of HIUsDiversity Diversity Diversity

123456789

101112131415161718192021222324252627282930313233

343536373839404142434445464748495051525354555657585960616263646566

10.61940.47650.39880.34900.31390.28760.26700.25040.23660.22500.21510.20640.19880.19200.18600.18050.17560.17100.16700.16310.15960.15630.15330.15040.14780.14530.14290.14070.13860.13660.13470.1329

0.13120.12960.12800.12650.12510.12380.12240.12120.12000.11880.11770.11660.11560.11480.11360.11270.11180.11090.11000.10920.10840.10760.10690.10610.10540.10470.10400.10340.10270.10210.10150.10090.1003

676869707172737475767778798081828384858687888990919293949596979899

0.09980.09920.09870.09810.09760.09710.09660.09610.09560.09520.09460.09420.09390.09340.09300.09260.09220.09180.09140.09100.09070.09030.08990.08960.08920.08890.08860.08820.08790.08760.08720.08700.0867

Instantaneous Hot Water

HeatingC A L C U L A T I O N G U I D ETechnical

Diversity Factor

Output Rating

Primary Delta T

Primary Pressure Drop

Primary Flow Rate

SecondaryFlow Rate

Secondary Pressure Drop

Secondary Delta T

Kw5

1015202030304040405060

°C151520202020202030303030

°C101015152015202020303030

kPa0.4631.862.354.23.99.49.4

16.67.47.411.616.7

kPa0.5462.182.183.92.28.84.98.88.83.96.18.8

l/m4.779.53

10.7214.314.321.521.528.619.119.123.828.6

l/m7.1514.314.319.014.328.621.528.628.619.123.828.6

Output Rating

Primary Delta T

Primary Pressure Drop

Primary Flow Rate

DHW SecondaryFlow Rate

Secondary Pressure Drop

Secondary Delta T

Kw3040506070

°C33 (55/22)38 (60/22)48 (70/22)48 (70/22)53 (75/22)

°C35 (10/45)35 (10/45)35 (10/45)35 (10/45)35 (10/45)

kPa3.85.15.07.18.0

kPa2.74.77.8

10.714.5

l/m13.015.014.917.918.9

l/m12.316.320.424.528.6

18

C O N T R O L S

ESSCOESSCO

Boiler or Heat Source

HIUHIUHIU HIU HIU HIU

HIUHIUHIU HIU HIU HIU

HIUHIUHIU HIU HIU HIU

0.288 l/s 0.411 l/s 0.524 l/s

0.288 l/s 0.411 l/s 0.524 l/s

0.836 l/s

1.416 l/s

1.970 l/s

0.288 l/s 0.411 l/s 0.524 l/s

0.524 l/s 0.411 l/s 0.288 l/s

0.524 l/s 0.411 l/s 0.288 l/s

0.524 l/s 0.411 l/s 0.288 l/s

Total flow rate without diversity = 2.592 l/sTotal flow rate with diversity = 1.970 l/s

Effect of Diversity Factors

Thesimplesystembelowillustratestheeffectsfordiversity.Itassumesthateachapartmentisidenticalwiththefollowing:-

Heat load 3 kWDHW load 50 kWHeating ∆T 10 °CDHW primary ∆T 55 °C

19

sales@esscocontrols.co.ukC O N T R O L S

ESSCOESSCOwww.esscocontrols.co.uk

Heat Interface Unit

HIU Planning List

+44 (0) 1489 779068

Flow Rate Calculation Sizing the Central Boiler PlantUsing the diversity factor from the chart, the maximum design flow rate for each section of heating pipe can be determined.The flow rate through each pipe must be capable of delivering the peak heating demand for the apartment being served plus the peak simultaneous diversified demand for domestic hot water. Qτ = (F * QHW) + (QHTG)WhereF = coincidence or diversity factor QT = total design flow rate - l/sQHW = water flow rate to meet peak domestic hot water demand - l/sQHTG = Water flow rate required to meet peak space heating demand - l/sThe quantity of hot water to heat the domestic hot water QHW can be calculated from the equation:

WherePHW = energy required in kW for all HIU domestic hot water∆TDH = design temperature drop across the central boiler plant side of the heat exchanger during hot water production - typically 50°C-75°Cflow,25°Creturn.4.2 = specific heat factor - kJ / kg°KThe quantity of hot water for space heating QHTG can be calculated from the equation:

WherePHTG = energy required in kW for all apartments - typically 3 to 10 kW each∆THTG = design temperature drop across the central boiler plant side - typically30°C-75°Cflow,45°Creturn.

Buffer tank provides a thermal store to enable the system to supply a large amount energy for a short period.The buffer tank cools during peak demand and returns to the design temperature when the peak demand has passed.The central boiler plant can therefore be sized to meet the total heating load PHTG plus an additional allowance to re-heat the buffer tank within one hour PBUFFER.The ESS-Cylinder with a storage cylinder in each apartment acts in a similar manner as a buffer vessel for the domestic hot water dealing with peak demand and reheating within short time period.A buffer vessel should still be installed as part of the centralised plant to deal with peak demand for energy as previously described.

Energy Required to Heat Buffer VesselThe quantity of hot water to heat the contents of the buffer vessel within one hour can be calculated from the equation:

WhereV = volume of buffer vessel - litreFor a duration less than one hour substitute the number of seconds for 3,600.

Buffer Vessel SizingThe buffer vessel should be sized to deal with peak heating and hot water demand sustained over a period of 10 minutes= 600 seconds.Assuming the boiler plant is controlled to maintain the required heating flow temperature at a point two thirds of the way down the vessel then the required energy flow into the vessel will be for 900 seconds. V = 900 * F * QHW

WhereV = volume of buffer vessel - litre

Please complete the table below, together with any further additional information.

Domestic Hot water specificationDHW Temperature requirementsDHW flow rate requirementsCentral Heating SpecificationHeating LOAD (Kw)Heating flow design temperaturePrimary (District) specificationPRIMARY (District) Flow temperaturePRIMARY (District) Return temperaturePressure Drop across the Primary Flow and returnCold waterCold water (inlet) design temperatureCold water (inlet) design pressureAdditional Specification

Required Value submitted by the System Design House

Required Value submitted by the System Design House

Required Value submitted by the System Design House

Required Value submitted by the System Design House

Required Value submitted by the System Design House

Actual confirmed

Actual confirmed

PHW

4.2 * ∆TDHQDHW =

QDHW = PHTG

4.2 * ∆THTG

PBUFFER = V * 4.2 * ∆TDH

3,600

20

Version 2