Roof Pond Cooling System

Roof ponds provide cooling benefits through indirect evaporative cooling and or radiant cooling 19 22 23 24 25 26.

Roof pond cooling system.

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. This review suggests that in some cases roof ponds can provide year round thermal comfort while reducing demand for. Evaporation in a pond is proportional to the air water contact area.

A more refined method involves insulating the pond during the daytime to prevent solar gain. 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 paper systematically reviews literature on passive heating and cooling of buildings using roof ponds. 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.

In the simplest form this involves placing a pond on the building roof. During the day water in the pond absorbs heat cooling the ceiling below. Exposure of the water pond to the night sky for cooling. Overall 19 roof pond cooling and 4 roof pond heating systems were identified.

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. H2o sun 3. What is roof pond roof pond is a passive cooling technique based upon the increased heat capacity of cheap and widely available water. 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.

As water evaporates from the pond heat is consumed. With these elements a roof pond can contribute to thermal comfort in all seasons. 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 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.