The Heat Transferred Reduction From Building Roof Which Exposed to Environmental by using Grasses and Water (Experimental Study)

Abstract

The object of this paper, is to study the thermal behavior of building roofs which covered by grass (used 50 mm sand as a base for American grasses and watered weeds by 0.0004 L/sec.m2 for growth) or sprinkle the water (0.0004 L/sec.m2) on that roofs, therefore , a room of dimensions (4.5 x 4.5 x 3) m was build in 3rd floor in building at Baghdad city (33.2°N) with thermal insulation of 200 mm thickness for other room sides and using Air – conditioner 1.0 ton of refrigeration to afford the standard thermal comfort, and measured the roof surfaces temperature from 5:00 Am to 10:30 Pm (18 hr/Day) during May to September month, it was found that, the grasses in roofs building was saved 53% from electrical energy for cooling purpose, while sprinkle the water on roofs saved 38 % only