Passive Solar
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Passive Solar
In a passive Solar House, the sun heats water stored in barrels to a temperature of 38°C.The stored energy is
then used to heat the house on cloudy days. Suppose that 2.4×10^8 J of heat are needed to maintain the inside of the house at 21°C. how many barrels ( 1 BARREL= 0.16 M^3) OF WATER are needed?
What does the E stand for
edwards what is E
We have to determine the heat capacity of one barrel and divide the total heat required [ 2.4E+8J ]over that number.
The heat capacity per barrel is
Q(barrel)= m Cp (T2-T1)
Q(barrel)= pV Cp (T2-T1) since Cp=4181.3 kJ/kg K
Q(barrel)= 1E+3 x 0.16 4181.3 (38 – 21)=
Q(barrel)= 11 E+6 J
Number of barrels= 2.4E+8/11.4 E+6 = 21 barrels
Underground House – Passive Solar – Pt. 2
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