An assignment on climate-ll(Hot dry climate)

Group 01

GR

O- 0

6

PAGE: 06-01

GR

OU

P- 0

6G

RO

UP-

01

PAGE: 01-01

BASIC OVERVIEW OF HOT,DRY AREAS• Very hot,dry air and dry ground• Day-time temperatures range between 27-49 degC• Night-time-falls to 22 degC• Humidity-continuously moderate to low• Dry air,low humidity and minimal rainfall discourage

plant life• Local thermal winds carry dust and sand• Clear sky most of the year

PHYSIOLOGICAL OBJECTIVES-• Depends on reduction of the intense radiation from

the sun,ground and surrounding buildings• During day, the designer must select walls and roofs which can

maintain inner surface temperatures less than the skin temperatures.

• At night, the air temperature is low enough to permit an increase in effective temperature by surfacetemperatures higher than this air temperature.

• Low Humidity-Hence evaporation is greater than any other climate

• Breeze-cannot be used to advantage indoors.

GR

OU

P- 0

1

PAGE: 01-02

Form and planning:• As outdoor conditions are very hostile, both the interior and the

exterior of the building need to be protected. Hence , an enclosed , compact in-ward looking building will be suitable.

• Hot dry climates occur in a wide range of latitudes and geographic locations. This creates a variety of diurnal ranges and winter heating requirements with hot to very hot, dry summers.

• Evaporative cooling from ponds, water features and ‘active’ or mechanical cooling systems is ideal for arid climates where low humidity promotes high evaporation rates.

• Evaporative cooling or a ceiling fan should be used if required.• Use high mass solutions with passive solar winter heating where

winters are cool or cold and diurnal ranges are significant.• Use low mass elevated solutions where winters are mild and

diurnal ranges are lower.• Consider high mass construction for rooms with passive winter

heating and low mass for other rooms.• Shade all windows in summer and east and west windows year

round.• Well sealed windows and doors with maximum opening area

allow maximum exposure to cooling breezes and exclude hot, dry and dusty winds.

Two storey solution for hot and dry climate

GR

OU

P- 0

1

PAGE: 01-03

• Topography, to enhance the efficiency of passive means

• Orientation, to reduce the sun exposure in summer.

• Air movement, to provide ample ventilation in

summer and protect from winds in winter.•

Form, to design compact settlements for mutual protection

• Hazards, to avoid dangerous sites

Typical settlement for hot-dry regions

SETTLEMENT PLANNING

GR

OU

P- 0

1

PAGE: 01-04

Outdoor spaces:• As most day-to-day activities take place

outside,it is important totreat the external spaces just as carefully as the indoors.

• Adjacent buildings,pavements,roads heat up quickly and cause aglare onto the building during the day and at night,they reradiatethe heat stored during the day.

• One way to avoid this is to place walls protecting external spaces,tokeep out dust and winds.

• Also,landscaping like trees,plants and water in enclosed spaces willcool the air by evaporation.

• But the best solution is courtyards. In these,a pool of night air isretained,as this is heavier than surrounding warm air

• A small courtyard is excellent as a thermal regulator.

Courtyard design with evaporative cooling

GR

OU

P- 0

1

PAGE: 01-05

•curtain wall systems but this usually provides poor external views, lack of optimal natural light and introduces excessive shine outward.

•Alternatively, shading fixed devices, the "mashrabiya" in Al Bahar Towers has a number of components transparent umbrella that open and close in response to the sun's path.

•Each of the two towers comprising more than 1,000 individual sunscreens are controlled via the building management system, creating a smart facade.

Al bahar- Cool building in Abu Dhabi’s heat

Mashrabiya’s opening sequence

sectionplan

GR

OU

P- 0

1

PAGE: 01-06

• Courtyard or Patio• White Colored walls (“cool” colours reduce heat

reflection )• Arrangement of the houses in is very closely packed to

each other.• Vegetation (reduces the temperature, filter’s the dust

in • and around the house, elevates the humidity level may

reduce as well as increase the wind speed)• small openings• double roof or white single roof • thick walls• big basin to collect rainwater• louvered windows• pergolas• a water body

OVERVIEW OF DESIGN PRINCIPLES..

PAGE: 01-06

Thank you..

Submitted by:130103130124130134100131

references1. A text book of climate and design for the built-form designers –Bijon b. Sarma , Falguni Mallick2. Manual of tropical housing and building -koenigberger3. https://www.academia.edu/5653558/Designing_shelters_for_Hot_Dry_Climates4. http://archive.unu.edu/unupress/unupbooks/80a01e/80A01E07.htm#Orientation5. http://collections.infocollections.org/ukedu/en/d/Jsk02ce/4.5.html

GR

OU

P- 0

1

PAGE: 01-01