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A 2.4-m high 200-m2 house is maintained at 22°C by an
Chapter 6, Problem 156P(choose chapter or problem)
Problem 156P
A 2.4-m high 200-m2 house is maintained at 22°C by an air-conditioning system whose COP, is 3.2. It is estimated that the kitchen, bath, and other ventilating fans of the house discharge a houseful of conditioned air once every hour. If the average outdoor temperature is 32°C, the density of air is 1.20 kg/m3, and the unit cost of electricity is $0.10/kWh, the amount of money “vented out” by the fans in 10 hours is
(a) $0.50
(b) $1.60
(c)$5.00
(d) $11.00
(e) $16.00
Questions & Answers
QUESTION:
Problem 156P
A 2.4-m high 200-m2 house is maintained at 22°C by an air-conditioning system whose COP, is 3.2. It is estimated that the kitchen, bath, and other ventilating fans of the house discharge a houseful of conditioned air once every hour. If the average outdoor temperature is 32°C, the density of air is 1.20 kg/m3, and the unit cost of electricity is $0.10/kWh, the amount of money “vented out” by the fans in 10 hours is
(a) $0.50
(b) $1.60
(c)$5.00
(d) $11.00
(e) $16.00
ANSWER:
Step by step solution Step 1 of 4Obtain the specific heat of air from table A-2 “ideal gas specific heats of variouscommon gas”.Here, the gas constant is and the specific heat constant of air isCalculate the volume of the room.Here, the area of the room is and the height of the room is .Substitute for and for .\n