A household freezer opera a rate of 2 kW to maintain power input required to o
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- A domestic food freezer maintains a temperature of-20°C. The ambient air temperature is 40°C. If heat leaks into the freezer at the continuous rate of 2.0 kJ/s what is the least power necessary to pump this heat out continuously?A freezer maintains a temperature of-30°C. The ambient air temperature is 20°C. If heat leaks into the freezer at the continuous rate of 3.15 kJ/s what should be the least power necessary to pump this heat out continuously?a refrigerator operating in a room at 20 c has to extract heat at r rate of 500 w from the cabinet at 4 c to compensate for the imperfect insulation. how much power must be supplied to the motor if its efficiency is 80% of the maximum possible?
- Q3/ A refrigeration unit is cooling a space to −5°C by rejecting energy to the atmosphere at 20°C. It is desired to reduce the temperature in the refrigerated space to −25°C. Calculate the minimum percentage increase in work required, by assuming a Carnot refrigerator, for the same amount of energy removed.The thermal efficiency of an engine used to drive a refrigerator is 30%. The heat input into the engine for each MJ removed from the cold body by the refrigerator is 666.67 kJ. What is the COP of the refrigerator?A large heat pump should upgrade 4 MW of heat at 65 C to be delivered as heat at 145 C. What is the minimum amount of work input that will drive this?
- The performance of a heat pump degrades (i.e., its COP decreases) as the temperature of the heat source decreases. This makes using heat pumps at locations with severe weather conditions unattractive. Consider a house that is heated and maintained at 20°C by a heat pump during the winter. What is the maximum COP for this heat pump if heat is extracted from the outdoor air at –5°C?An inventor comes to you saying he has invented a refrigerator that maintains a room at 20F while operating in a location at 80F with a coefficient of performance of 8.5, is this possible?With a 1 kW pump, the energy leakage per unit time is 0.6 kW for a 1 ℃ temperature difference between a house to be heated and the outside environment. Coefficient of performance of the heat pump used to keep this house at a constant temperature of 20 ℃; If it is up to the theoretical heat pump performance coefficient; What is the minimum outdoor temperature ℃ for this heat pump to meet its needs and be used?
- A household freezer operates in a room at 20 C. Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30 C. What is the theoretically the smallest (power) motor required for operation of this freezer?A solar energy based heat engine which receives 80 kJ of heat at 100 deg C and rejects 70 kJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine isA certain refrigerator has a COP of 5.00. When the refrigerator is running, its power input is 500 W. A sample of water of mass 500 g and temperature 20.0°C is placed in the freezer compartment. Assume all other parts of the refrigerator stay at the same temperature and there is no leakage of energy from the exterior, so the operation of the refrigerator results only in energy being extracted from the water. -->Compare the cost to make 44 kg of ice using two different refrigerators; one has a COP of 5.00 and the other has a COP of 6.00. Electricity costs $0.10 per kWh. Using the same assumptions given in the example, find the cost difference (in dollars) between the refrigerators to freeze the water.