Please And TY Solar Energy Can Preheat Cold Water For Domestic Hot-water Tanks. What Quantity Of Heat Is Obt?
August 29th, 2009
Solar energy can preheat cold water for domestic hot-water tanks. What quantity of heat is obtained from solar energy if 100 kg of water is pre-heated from 10ºC to 45ºC
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Home > Solar Power For Home Q & A > Please And TY Solar Energy Can Preheat Cold Water For Domestic Hot-water Tanks. What Quantity Of Heat Is Obt?
According to the listed reference, the specific heat of water is 4.184j/(g-degree C). 100kg is 100,000g.
Q = m*c*ΔT = (100,000)*4.184*(45 - 10) = 14.64*10^6 joules
If you use c = 1 kcal/(kg-degree C), the answer is:
100*1*(45 - 10) = 3500 kcal.