Climatic zones. warm and humid

Climatology
Warm and Humid climatic Zone

1. WARM AND HUMID CLIMATE
PRESENTED BY-AR.ROOPA CHIKKALGI. BGS SAP

2. WARM AND HUMID CLIMATE
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▪CostalareasinsouthIndiaandhillyareasinnortheast
comesunderthisregion.
▪MajorcitieshavingthisclimateareGoa,Mumbai,
Visakhapatnam,Kolkata,Chennaietc.
▪Highhumidity,strongsun,glarefromthesky
characterizethisclimate.
▪Therearelongmonsoonperiodswithheavyrain.Butthe
breezes,especiallyincoastalareas,canincrease
discomfortconsiderably.

3. CHARACTERISTICS OF WARM AND
HUMID CLIMATE
➢TEMPERATURE
•IN SUMMER, 30-35ºC DURING DAY & 25-30ºC AT NIGHT.
•IN WINTER, 25-30ºC DURING DAY & 20-25ºC AT NIGHT.
➢HUMIDITY
•HUMIDITY IS VERY HIGH RANGING FROM 70-90%
➢PRECIPITATION
•PRECIPITATION IS VERY HIGH ABOUT 1200 MM/YR.
➢SKY CONDITIONS
•SKY IS FAIRLY CLOUDY.
•CLOUD COVER 60-90%.
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4. CHARACTERISTICS OF WARM AND HUMID
CLIMATE
➢SOLAR RADIATION
•THE INTENSITY OF SOLAR RADIATION IS HIGH DURNING SUMMERS AND MODERATE DURNING WINTERS .
➢WIND
•WIND VELOCITY IS LOW, CALM AND PERIODIC. BUT MAY BE STRONG DURNING RAIN SQUALLS.
➢VEGETATION
•GROWS QUICKLY DUE TO FREQUENT RAINS.
•DIFFICULT TO CONTROL.
•HIGH HUMIDITY ACCELARATES MOULD AND ALGAE GROWTH, RUSTING AND ROTTING.
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5. •Resisting heat gain:
Measures that are convenient to avoid heat gain are:
(a)Decreasing surface area of the building exposed to the outside.
(b)Using materials that take a longer time to heat.
(c)Providing buffer spaces between the outside and the inside.
(d)Increase the shade of the building in general.
(e)Using materials that reflect heat.

6. •Promoting heat loss:
To promote heat lost it is essential to ensure:
(a) Building is well ventilated.
(b) Proper ventilation occurs throughout the day.
(c) Humidity levels are reduced as much as possible.

7. ▪Most of the buildings in warm humid climate have sloping roofs to protect from rain
BUILDINGS –WARM HUMID CLIMATE

8. WARM AND HUMID CLIMATE
BUILDING CHARACTERISTICS
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1.BUILDINGS SHOULD BE SPREAD OUT WITH LARGE OPEN SPACES IN BETWEEN FOR UNRESTRICTED AIR MOVEMENT.
2.CROSS VENTILATION IS VERY IMPORTANT. LARGE OPENINGS TO UNOBSTRUCT AIR PATH AND TO ENSURE PROPER
VENTILATION.

9. 3. THE OPENINGS SHOULD BE SHADED BY EXTERNAL
OVERHANGS.
4 .OUTLETS AT HIGHER LEVELS TO VENT HOT AIR.
5.PROPER WATER PROOFING AND QUICK DRAINAGE
OF WATER IS ESSENTIAL DUE TO HEAVY RAINFALL.
WARM AND HUMID CLIMATE
BUILDING CHARACTERISTICS

10. Generalrecommendationsforbuilding designin
warmandhumidclimate
➢ Site:
(a)Landform:
•For flat sites, design consideration for the
landform is immaterial.
•In case of slopes and depressions, the
building should be located on the wind ward
side or crests to take advantage of cool
breezes.

11. (b) Waterbodies:
•Waterbodies are not essential as they would tend to further
increase the humidity.
(c) Street width and orientation:
•Major streets should be oriented parallel to or within 30 of the
prevailing wind direction during summer months to encourage
ventilation in warm and humid regions.
•A north-south direction is ideal from the point of view of blocking solar
radiation.
•The width of the streets should be such that the intense solar radiation
during late mornings and early afternoon is avoided during the
summers.

12. (C) Open spaces and built form:
•Buildings should be spread out with large open spaces in between for unrestricted air
movement.
•In cities, buildings on stilts can promote ventilation and cause cooling at the ground
level.
BUILDING SPACING SUCH THAT AIR FLOW IS PROMOTED

13. (2) Orientation and planform:
•As the temperatures are very high, free plans and can be evolved as long as the house is
under protective shade.
•An unobstructed air path through the interiors is important to ensure proper ventilation.
•The buildings could be long and narrow to allow cross ventilation.
ELONGATED PLANS FOR MAXIMUM CROSS VENTILATION

14. Heatandmoistureproducingareasliketoiletsandkitchensmustbeventilated
andseparatedfromtherestofthestructure.
VENTILATE KITCHENS AND BATHS TO EXHAUST HOT AIR

15. •Semiopenspacessuchasbalconies,verandahsandporchescanbe
usedadvantageouslyfordaytimeactivitiesaswellasgiveprotection
fromrainfall.
•Inbuildingsacentralcourtyardcanbeprovidedwithventsathigher
levelstodrawawaytherisinghotair.
WINDOWS AT HIGH LEVEL TO VENT HOT AIR

16. HIGH PITCHED ROOFS WITH LOUVERS FOR VENTILATION
(3) Building envelope:
(a)Roof:
In addition to providing shelter from rain and heat, the form of the roof should be
planned to promote airflow. Vents at the rooftop effectively induce ventilation and draw
hot air out.

17. The openings should be shaded by external overhangs. Outlets at higher levels serve
to vent hot air.
OUTLET LARGER THAN INLET
INLET AT LOWER LEVEL AND OUTLET AT HIGHER LEVEL

18. Examples illustrating how the air movement within a room can be better
distributed.
DISTRIBUTE AIR THROUGHOUT THE ROOM

19. (d) Colour and Texture:
•The walls should be pasted with light pastel shades or white
washed while the surface of the roof can be of broken glazed tile
(china mosaic flooring) to reflect the sunlight back to the
environment, and hence reduce heat gain of the building.
•The use of appropriate colours and surface finishes is a cheap and
very effective technique to lower indoor temperatures.
•The surface finished should be protected from/resistant to the
effects of moisture.

20. ▪REQUIREMENTS IN A HOT AND HUMID CLIMATE:
WARM AND HUMID CLIMATE
▪Minimization of high day temperature.
▪Avoiding direct exposure of building surfaces to sun.
▪Humidity control.
▪Continuous air circulation to reduce heat.
▪To create a temperature difference between indoor and outdoor

21. HOT AND HUMID
▪Orientation and ventilation:
▪Semi –open spaces for light and air movement .
▪Buildings should be spread out with large open spaces in between for uninterrupted
air movement.
▪Cross ventilation is very important. large openings to unobstructed air path and to
ensure proper ventilation.
▪The openings should be shaded by external overhangs. Outlets at higher levels to
vent hot air.
▪Proper water proofing and quick drainage of water is essential due to heavy
Rainfall.

22. WARM AND HUMID
▪Shading:
▪Keep sunlight off of building walls: After aiming the building
to catch the breeze, try to face the long sides (with most of
the windows) towards the south and north so the roof
overhang shades walls and windows in the middle of the day.
▪Shade in the afternoon: Keep west and east sides short to let
less of the hot, low angle morning and afternoon sun heat up
walls, especially during the hottest season. Be sure you are
considering whether the sun is in the northern or southern sky
at this time of year.
▪Cover openings on west and
east ends. Use few windows
and doors. For openings use
vertical sunscreens, climbing
vines,orshrubs to reduce heat
gain on western walls.

23. HOT AND HUMID
▪Building materials:
The locally available materials which
dominate building construction in these
climatic zones are;
▪Timber
▪Sun dried and kiln burn brick
▪Thatch and Bamboo
▪Clay tiles for roofing
Cavity wall detail
Above: typical thatch roof.
Left: half round country clay tiles.

24. HOT AND HUMID
▪Extensive use of bamboo in building construction.
▪Timber used as vertical and horizontal support.

25. DESIGN / PLANNING CONCEPTS
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26. ORIENTATION
Orientation to minimize sun
radiation impact.

29. STONE PILLARS

30. CENTRAL
COURTYARDS

32. •The advantage of courtyard and veranda is proper ventilation and controlled humidity.
•Cross ventilation is done properly.
•Movement of air is perfect in the building by central courtyard.

33. USE OF STONE