HOT AND DRY
Regions having similar characteristic features of climate are
grod undupeer one climatic zone. According to a recent code of
bureau of Indian standards, the country may be divided into five
major climatic zones.
• Hot and dry (mean monthly temperature >30 and relatively
• Warm and humid (mean monthly temperature >25-30 and
relatively humidity <55-75%).
• Cold and dry (mean monthly temperature <25 and
relatively humidity- all values).
• Composite (this applies, when six months or more do not fall
within any of the other categories).
Nature of hot and humid climate
Hot-dry desert and semi desert climates are characterised by very hot,dry air and
hot dry weather in summer and cold in winter.
very little rainfall.
very low humidity.
high temp. difference between night and day.
hot winds & frequent dust storms
High summer day time temperatures(32-36° C)
In hotter regions above 40 and up to 50°C.
High direct solar radiation
Clear sky most of the year
sandy or rocky ground with very low vegetation cover.
Orientation and placement, to minimize sun
exposure in summer.
Form, compact to reduce surface areas of heat
Shade, for maximum sun protection in summer.
Allow adequate heat gain in winter by movable
Ventilation, for regulation of air movement
AN ARCHITECT’S STUDIO, AHMEDABAD
BY B.V. DOSHI
Period of Const. :
B.S. Jethwa, Y.Patel
Site Area:2346 m2
Total Built-up Area: 585 m2
Project Cost: 0.6 Million
Minimizing Solar Radiation on South and
West side : The structure is closely
integrated with the outdoor spaces.
Vegetation on site is almost left to grow
into wilderness. The West and South
façade is shaded by dense trees.
Maximizing Wind Flow :
Wind from West and South-West side is
taken in by juxtapositioning structures so
as to create a central open space through
which wind can flow unobstructed
Vaulted Roof Form
The roof form creates an efficient surface volume/ratio optimizing material
Higher Space Volume
provides for hot air pockets due to convective currents that keep lower volumes
Ventilating window at upper volume
releases the accumulated hot air
through pressure difference.
Building is largely buried under ground to use earth masses for natural insulation.
External walls of the building are nearly a meter deep but have been hollowed out as alcoves to provide
storage that becomes an insulative wall with efficiency of space.
oUpper Level Large Openings - Facing North.
oSkylights as projected masses from the roof.
oSmall cut-outs on roof slab filled with hollow glass blocks.
Locally made clay fuses over the concrete slab to form a non-
The clay fuses entrap air. Known as sandwich vault.
3.5 cm thick RCC
8 cm ceramic fuses
3.5 cm thick RCC
6 cm thick water proofing
1 cm thick broken China mosaic finish
Water is the major modifier of the microclimate.rain water and
overflow of tank water harnesshed through roof channel and
reused.water moderates the harsh ambient out side of the building.
A temperature difference of about 8°C
Time lag for heat transfer is nearly 6 hours
30% to 50% reduction in cooling energy
Waste material reuse
10% saving in cost through lack of finishes.