Heating Homes With Solar Energy

Heating Homes With Solar Energy

Heating Homes With Solar Energy
New cluster of Habitat homes to stress energy efficiency in St. Croix Falls
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what is specific heat and how do I solve a problem with it?

A solar energy home stores thermal energy in a large crib of rocks with a specific heat of 0.25 Btu/lb- degrees F. The heat capacity of the rocks, Q = (mass)x(specific heat)x(T2 – T1). If the rocks cool from 100 degrees F to 70 degrees F in heating the house, the number of tons of rock required to store 600,000 Btu (a typical day’s required heat input) =

mcΔT = Q.

m x 0.25Btu/lb/°F x 30°F ΔT = 600,000Btu.
m x 7.5Btu/lb = 600,000Btu.
m = 600,000Btu / 7.5Btu/lb = 80,000lb of rock / 2000lb/ton = 40 tons.

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