hot water tanks

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Please and TY Solar energy can preheat cold water for domestic hot-water tanks. What quantity of heat is obt?

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

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.

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