determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.

A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained at 25°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from a heat source outside the house to inside the house. Consider a heat pump receiving heat from two different outside energy sources. In one application the heat pump receives heat from the outside air at 0°C. In a second application the heat pump receives heat from a lake having a water temperature of 10 determine the maximum money °C. If electricity costs $0.085/kWh,saved by using the lake water rather than the outside air as the outside energy source

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