Calculate and plot the COP of a completely reversible refrigerator as a function of the temperature of the sink up to 500 K with the temperature of the source fixed at 250 K.
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Calculate and plot the COP of a completely reversible refrigerator as a function of the temperature of the sink up to 500 K with the temperature of the source fixed at 250 K.
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- Derive an expression for the COP of a completely reversible refrigerator in terms of the thermal energy reservoir temperatures, TL and TH.There is a refrigerator that uses HFC-134a as a refrigerant and operates between 1.4 atm and 12 atm. Calculate the coefficient of performance of this refrigerator and the proportion of vapor at the lowest temperature through the throttle, respectively.In a refrigerator the power rating impressed on the compressor is 1.2 kW. The circulating wire in evaporator is 5 kW and the cooling water took away 10 kW from condenser coil. The operating temperatures range is 18ºC and 0ºC and their corresponding latent heats are 170 kJ/kg and 230 kJ/kg and the difference between theliquid energy is 35 kJ/kg. Find the actual COP of the system (2) relative COP, assuming the vapor is just dry and saturated at the end of the compression.
- 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.A completely reversible heat pump has a COP of 1.6 and a sink temperature of 300 K. Calculate the temperature of the source.Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. Efficiency of the Carnot engine is 38%. For this information answer the following questions: 1) A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI. In one option the room is heated using resistive heaters that are operated with electricity. For the same conditions described in part 1 above, consider using a Carnot heat pump to supply the heat to the room. The low temperature…
- Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. Efficiency of the Carnot engine is 38%. For this information answer the following questions: A room is maintained at a constant temperature of 20 C and has a heat loss of 20,000 W. Consider this room for a period of 3 hours. The surroundings are at a temperature of TI. In one option the room is heated using resistive heaters that are operated with electricity. a)Determine the electrical energy input to these heaters. b)Determine the efficiency of this heating system. c)Determine the entropy production…Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. For this information answer the following question: a) Calculate the Carnot Efficiency of a heat engine that operates between TH and TL.Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. A region is to be cooled to a temperature of 277 K using a Carnot refrigerator. The heat that must be removed is 15,000 W. The heat rejected from the refrigerator is to a heat reservoir at TH. Consider the cooling for a period of 3 hours. Answer the following: a)Determine the electrical energy input to the Carnot refrigerator. b)Determine the Coefficient of Performance (COP, the efficiency) of this cooling system. c)Determine the entropy production for this this cooling system. In this case you should…
- Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. A region is to be cooled to a temperature of 277 K using a heat powered Carnot refrigerator. The heat that must be removed is 15,000 W. The heat rejected from the refrigerator is to a heat reservoir at TL. The heat input to this device is from a reservoir at TH. This is a Carnot model of an absorber refrigeration system. In it a Carnot heat engine operates between reservoirs at TH and TL. The work output from this Carnot heat engine is the input to a Carnot refrigerator that operates between TI and…Consider three reservoirs that are TH = 473.2 K, TL = 293.2 K and TI = 277.2 K. A Carnot heat engine can be reversed and used as either a heat pump or a refrigerator. In the case of a heat pump the heat flow to the higher temperature reservoir is the desired output and it is used to heat a room or building. In the case of the refrigerator the desired energy flow is the heat in from a region to be cooled. For the heat pump or refrigerator, the work input is provided by electricity. A region is to be cooled to a temperature of 277 K using a heat powered Carnot refrigerator. The heat that must be removed is 15,000 W. The heat rejected from the refrigerator is to a heat reservoir at TL. The heat input to this device is from a reservoir at TH. This is a Carnot model of an absorber refrigeration system. In it a Carnot heat engine operates between reservoirs at TH and TL. The work output from this Carnot heat engine is the input to a Carnot refrigerator that operates between TI and…Prove that the COP of all completely reversible refrigerators must be the same when the reservoir temperatures are the same.