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 $0.12/ kWh, determine the maximum amount of money saved by using the lake water rather than the outside air as the outside energy source.

Q: A heat pump is used to maintain a house at T,°C_by House extracting heat from the outside air on a…

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Q: house is to be maintained at 20°C when the outside air is at -25°C. It is determined that 1800 kJ is…

A: Given:Ti=20 CTo=-25 CQs=1800 KJ/minR=13 cents/KWh

Q: A Carnot heat engine receives 1000 kJ of heat from a heat reservoir at an unknown temperature and…

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Q: A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when…

A: Convert the temperature of surroundings or the sink into Kelvin. Here, tL is the temperature of the…

Q: A Carnot heat engine receives heat from a source at 800°C and rejects heat to a sink at 40°C. The…

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Q: A house is to be maintained at 20°C when the outside air is at -25°C. It is determined that 1800 kJ…

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Q: A Carnot heat engine receives heat from a high temperature source at 655°C and rejects heat to a…

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Q: Determine the expressions for the thermal efficiencies and coefficients of performance for…

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Q: An inventor claims to have developed a heat pump with a COP of 6.6 when operating with thermal…

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Q: During winter, a mechanical heat pump is turned on to supply heat to a house, which is maintained at…

A: TH=18°CTH=18+273=291 KTL=2°C+273=275 KQ1=27000 KJhrQ2=140000 KJhr

Q: A refrigeration cycle operating between hot and cold reservoirs at 40° C and 0°C removes energy by…

A: We have the Following Information :Hot reservoir temperature = Cold reservoir temperature=Heat…

Q: A Carnot refrigerator absorbs heat from a space at 15°C at a rate of 16,000 kJ/h and rejects heat to…

A: Given Data: The heat absorption temperature is TL= 15∘C. The heat rejection temperature is TH=36∘C.…

Q: scientist claims to have developed a heat engine with 70% thermal efficiency when operating with…

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Q: A carnot engine is working between two fixed temperature reservoirs 600 K and 300 K. Determine the…

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.