A Solar Heated House Loses About 5 $\degree$ C by the Solar Collectors and the House Is Maintained

question 57

Multiple Choice

A solar heated house loses about 5.4 ´ 10⁷ cal through its outer surfaces on a typical 24-h winter day.What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62 $\degree$ C by the solar collectors and the house is maintained at 20 $\degree$ C? (Specific heat of rock is 0.21 cal/g* $\degree$ C. )

• A)163 kg
• B)1 230 kg
• C)6 100 kg
• D)12 700 kg

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