At winter design conditions, a house is projected to lose heat at a rate of 70000 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, determine the required rated power of these heaters in kW to maintain the house at constant temperature.

The power to maintain constant temperature is 18.56kW

Explanation:

Given

Required

Determine the power to maintain constant temperature

The power to maintain a constant temperature is the difference between heat loss and gain

i.e.

This gives:

Convert Btu/h to kW

So:

Hence;

The power to maintain constant temperature is 18.56kW

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