Reduction of heat is achieved with the evaporation of water which is contained within Garden Crete.
Direct result - The evaporation heat of water is 540 cal/g.
Evaporation of water 1g take 540 cal of calorie from surface of earth.
During summer day time ,4 ~ 5 mm of water will evaporated from grass. 5mm/m2 of water takes 2700kcal of calorie from surface of earth per day.
2700kcal of calorie is equivalent to 3 hours operation of cooler.
40mm thickness of Garden Crete can retain 12kg/m? of water.
( 300kg/m3 x 0.04m = 12kg/m2)
Assuming that Evaporation volume of Garden Crete is same as grass, i.e. 5mm per day.
1.5kg/m2 of water evaporates from Garden Crete.
( 12kg/40mm . m2 x 5 mm = 1.5kg/m2 )