Roof Pond Cooling System

The main aims were to gain a detailed understanding of different roof pond configurations and their performance compare effectiveness of.

Roof pond cooling system.

Roof ponds provide cooling benefits through indirect evaporative cooling and or radiant cooling 19 22 23 24 25 26. 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. As water evaporates from the pond heat is consumed. 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.

Comparing performance relative to other passive strategies showed that in many cases roof pond cooling systems are about equally effective in maintaining indoor thermal comfort. In the simplest form this involves placing a pond on the building roof. With these elements a roof pond can contribute to thermal comfort in all seasons. Overall 19 roof pond cooling and 4 roof pond heating systems were identified.

In general the pond is covered during day to prevent heating and open at night to be cooled. 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. H2o sun 3.

To demonstrate a roof pond system that uses water and sun to heat and cool without electricity. 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. Evaporation in a pond is proportional to the air water contact area. This paper systematically reviews literature on passive heating and cooling of buildings using roof ponds.

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. Exposure of the water pond to the night sky for cooling. This review suggests that in some cases roof ponds can provide year round thermal comfort while reducing demand for. This cools the roof which acts as a heat sink and absorbs heat from the interior of the building.