Concept explainers
The maximum money saved by using the lake water instead of outside air as the heat source.

Explanation of Solution
Given:
The lower temperature of the reversible heat pump
The lower temperature of the reversible heat pump
The higher temperature of the reversible heat pump
The rate of heat reject by the heat pump
The cost of electricity is
The number of operating hours is 100 hours.
Calculation:
Initially calculate for outside air:
Calculate coefficient of performance for the reversible heat pump.
Calculate the minimum power input required to operate the heat pump.
Calculate the cost of the energy in a heat pump
Similarly,
For lake water:
Substitute
Substitute
Substitute
Calculate the maximum money saved by using the lake water
Thus, the maximum money saved by using the lake water instead of outside air as the heat source is
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Chapter 7 Solutions
Fundamentals Of Thermal-fluid Sciences In Si Units
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