Roof Pond Cooling System

As water evaporates from the pond heat is consumed.

Roof pond cooling system. In the simplest form this involves placing a pond on the building roof. This paper systematically reviews literature on passive heating and cooling of buildings using roof ponds. In both processes the roof acts as a heat exchanging element which is cooled by evaporation on its surface longwave radiation to the sky 1 or both. This cools the roof which acts as a heat sink and absorbs heat from the interior of the building.

The main aims were to gain a detailed understanding of different roof pond configurations and their performance compare effectiveness of. During the day water in the pond absorbs heat cooling the ceiling below. Roof ponds with wet gunny bags shaded roof ponds ventilated roof ponds and roof ponds with movable insulation proved to be more effective relative to other variants of roof pond cooling systems. In general the pond is covered during day to prevent heating and open at night to be cooled.

Also called an evaporative cooling system a roof misting system lowers surface temperatures by spraying an extremely small amount of water across the roof allowing the water to cool the roof as it evaporates. A more refined method involves insulating the pond during the daytime to prevent solar gain. At its lowest tech a roof misting system can be little more than a garden hose set to the mist setting and aimed across the roof. H2o sun 3.

Overall 19 roof pond cooling and 4 roof pond heating systems were identified. What is roof pond roof pond is a passive cooling technique based upon the increased heat capacity of cheap and widely available water. Evaporation in a pond is proportional to the air water contact area. The principal constituents of a roof pond system are the container for the water the supporting structure and the thermal insulation with which the thermal coupling and decoupling of the water are achieved.

This review suggests that in some cases roof ponds can provide year round thermal comfort while reducing demand for. Exposure of the water pond to the night sky for cooling. With these elements a roof pond can contribute to thermal comfort in all seasons. To demonstrate a roof pond system that uses water and sun to heat and cool without electricity.