Heating Homes With Solar Energy
Heating Homes With Solar Energy
New cluster of Habitat homes to stress energy efficiency in St. Croix Falls
“Green housing” may invoke images of towering wind turbines.
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.
Home Solar Panels to create Free Electricity!
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