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°C. If electricity costs $0.105/kWh, 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°C. If electricity costs $0.105/kWh, determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter17: Energy Conservation
Section: Chapter Questions
Problem 1P
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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°C. If electricity costs $0.105/kWh,
determine the maximum money saved by using the lake water
rather than the outside air as the outside energy source.
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