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A heat pump is used to heat a building. The external temperature is lower than the...
A heat pump is used to heat a building. The external temperature is lower than the...
A heat pump is used to heat a building. The external temperature is lower than the internal temperature. The pump's coefficient of performance is 4.20, and the heat pump delivers 4.16 MJ as heat to the building each hour. If the heat pump is a Carnot engine working in reverse, at what rate must work be done to run it?
A heat pump is used to heat a building. The external temperature is lower than the...
A heat pump is used to heat a building. The external temperature is lower than the internal temperature. The pump's coefficient of performance is 3.74, and the heat pump delivers 5.39 MJ as heat to the building each hour. If the heat pump is a Carnot engine working in reverse, at what rate must work be done to run it?
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold...
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold reservoir at 7°C to a warmer one at 22°C. a) What is the efficiency of a Carnot engine operating between these two temperatures? b) If the Carnot heat pump releases 250 J of heat into the higher-temperature reservoir e co in each cycle, how much work must be provided in each cycle? c) How much heat is removed from the 7°C reservoir in each...
earning Goal: To understand that a heat engine run backward is a heat pump that can be used as a refrigerator....
earning Goal: To understand that a heat engine run backward is a heat pump that can be used as a refrigerator. By now you should be familiar with heat engines--devices, theoretical or actual, designed to convert heat into work. You should understand the following: Heat engines must be cyclical; that is, they must return to their original state some time after having absorbed some heat and done some work). Heat engines cannot convert heat into work without generating some waste...
A certain heat pump operates on a reverse Carnot cycle, heating the interior of a house...
A certain heat pump operates on a reverse Carnot cycle, heating the interior of a house to 26 degrees C, while the exterior temperature is -2 degrees C. a) What is the coefficient of performance for this heat pump? b) If the house loses 100 kJ per hour to the exterior, how much power is required to run the heat pump?
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature a...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
A Stirling-engine is used in the heat-pump mode to heat a house. The engine maintains a...
A Stirling-engine is used in the heat-pump mode to heat a house. The engine maintains a temperature of 20.5 °C inside the house. The temperature of the Earth loop is 14.1 °C. (The Earth loop buried deep under the ground is the cold reservoir of this heat pump.) What is the coefficient of performance of this heat pump? Tries 0/12 If the power of the electric motor driving the heat pump is 157 W, then what is the rate at...
To make ice, a freezer that is a reverse Carnot engine extracts 42 k) as heat...
To make ice, a freezer that is a reverse Carnot engine extracts 42 k) as heat at -13°C during each cycle, with coefficient of performance 6.0. The room temperature is 29.9°C. How much (a) energy per cycle is delivered as heat to the room and (b) work per cycle is required to run the freezer? (a) Number Units (b) Number Units Click if you would like to Show Work for this question: Open Show Work
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at...
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency...
V6.23 Figure P6.23 shows a Carnot heat pump cycle operating at steady state with ammonia as...
V6.23 Figure P6.23 shows a Carnot heat pump cycle operating at steady state with ammonia as the working fluid. The condenser tem perature is 49°C, with saturated vapor entering and saturated liquid exiting. The evaporator temperature -12°C a. Determine the heat transfer and work for each process, in kJ/kg of ammonia flowing. o56, 73 kJ b. Evaluate the coefficient of performance for the heat pump. 5, c. Evaluate the coefficient of performance for a Carnot refrigeration cycle operating as shown...
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold reservoir at 7°C to a warmer one at 22°C. a) What is the efficiency of a Carnot engine operating between these two temperatures? b) If the Carnot heat pump releases 250 J of heat into the higher-temperature reservoir e co in each cycle, how much work must be provided in each cycle? c) How much heat is removed from the 7°C reservoir in each...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
To make ice, a freezer that is a reverse Carnot engine extracts 42 k) as heat at -13°C during each cycle, with coefficient of performance 6.0. The room temperature is 29.9°C. How much (a) energy per cycle is delivered as heat to the room and (b) work per cycle is required to run the freezer? (a) Number Units (b) Number Units Click if you would like to Show Work for this question: Open Show Work
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency...
V6.23 Figure P6.23 shows a Carnot heat pump cycle operating at steady state with ammonia as the working fluid. The condenser tem perature is 49°C, with saturated vapor entering and saturated liquid exiting. The evaporator temperature -12°C a. Determine the heat transfer and work for each process, in kJ/kg of ammonia flowing. o56, 73 kJ b. Evaluate the coefficient of performance for the heat pump. 5, c. Evaluate the coefficient of performance for a Carnot refrigeration cycle operating as shown...
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