At winter design conditions, a house is projected to lose heat at a rate of 60,000 Btu/h. The internal heat gain from people, lights, and appliances is estimated to be 6000 Btu/h. If this house is to be heated by electric resistance heaters, deter- mine the required rated power of these heaters in kW to main- tain the house at constant temperature.

A refrigerated compartment is maintained at a temperature of -5°C. Heat from the surroundings, at 25°C, leaks into the compartment at a rate of 1.2 kW. Find the compressor power required to maintain the temperature difference for the following scenarios:

The temperature inside a kitchen freezer is a constant 256 K, while the temperature of the air in the kitchen is a constant 302 K. The freezer's insulation is imperfect, and it conducts energy into its interior at a rate of 0.150 W. Assuming the freezer can be approximated as ideal (operating in a Carnot cycle), what is the average power required by the freezer's motor to maintain the constant interior temperature? W Need Help? Read It DETA LC

An automobile engine operates with a thermal efficiency of 35%. Assumed machine car cooler (AC) has a coefficient of performance = 3, and cools the room in the car using the work of the car engine. What is the energy of the material fuel expended to move 1 kJ.