DESIGN TYPES OF ROOFPOND MATERIALS HISTORY ENVIRONMENTAL SERVICES

1. Roof PondRoof Pond
Skytherm SystemSkytherm System
By Sushilkumar Gupta
S.Y.B.Arch 18 Sem iii

3. Skytherm House
•Invented by : Harold Hay in
1973
•At Atascadero ,California.
•Objective: to demonstrate
a roof-pond system that
uses water and sun to heat
and cool without electricity.
H2O + Sun =

4. What is Roof Pond
• Roof pond is a passive cooling technique based upon the
increased heat capacity of cheap and widely available
water. In general, the pond is covered during day to
prevent heating, and open at night to be cooled.
• Roof ponds can be inexpensively constructed by
enclosing water in plastic bags,
metal or fiberglass tanks with
rigid transparent plastic covers.

5. Climate & Performance
• Hot arid climates require ascending order of water-con-crete-
insulation thickness, in the summer and in descend-ing order of
thickness in the winter. For typical cold cli-mate ascending order of
thickness is more appropriate.
• The performance of the system appears to be satisfying; No
auxiliary heating or cooling systems were employed during the 9-
month test in California .
• Studies indicate that the indoor temperatures can be maintained
below 30°C in summer while the maximum dry-bulb temperatures
are above 40°C for hot arid climate of Delhi.

6. •A variation of the water wall is a "water
roof" utilized in the Skytherm
system.
•Water in PVC bags are placed on
corrugated steel or concrete roof,
covered with movable insulation panels
which stack over the roof pond.
Structure

7. Materials

8. How it works ?

9. Winter : Heating Cycle
•The uncovered roof draws heat in during Day time to collect solar heat
in the water bags.
•The covered roof then radiates the heat from the water bag to interior of
the house during Night time.

10. Summer :Cooling Cycle
• The uncovered roof expose the waterbag to the sky,The waterbag radiates absorbed
heat into the air during Night time.
• The covered roof keeps heat out and the indoor space cool during Day time.

11. Operating Principles

12. Thank You