An air conditioner is removing heat at a rate of 3424 W from a room that is maintained at 22 C and rejects heat to the surroundings at 36°C Knowing that the COP of the air conditioner is equal to 3.1, then the power (W) consumed by the air conditioner is equal:

An air conditioner is removing heat at a rate of 3424 W from a room that is maintained at 22 C and rejects heat to the surroundings at 36°C Knowing that the COP of the air conditioner is equal to 3.1, then the power (W) consumed by the air conditioner is equal:

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

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3. An air conditioner removes heat steadily from a house at a rate of 750 klimin while drawing electric power at a rate of 6 kW. Determine (a) the COP of this air conditioner and (b) the rate of heat transfer to the outside air. (20R. 0 min 1
(c) An air conditioner in a house removes heat steadily at a rate of 750 kJ/min while drawing electric power at a rate of 6 kW. Determine: (i) The COP of this air conditioner and; (ii) The rate of heat transfer to the outside air.
A refrigeration system absorbs heat from a space at 2 ◦C at a rate of 6.9 kW and rejects heatto water in the condenser. Water enters the condenser at 16 ◦C at a rate of 0.27 kg/s. The COPof the system is estimated to be 1.85. Determine (a) the power input to the system, (b) thetemperature of the water at the exit of the condenser, and (c) the second-law efficiency andthe exergy destruction for the refrigerator. Take the dead-state temperature to be the inlettemperature of water in the condenser. The specific heat of water is 4.18 kJ/kg·◦C.
b) Refrigerators are systems that are used to remove heat from a cooled space then reject heat to a space of higher temperature. Consider a refrigerator operating at normal conditions, removing heat from a cool space at a rate of 150 kJ/min to ensure the refrigerated space is kept at -5 °C. If the surrounding air is at 27 °C and assuming that the refrigerator is operating as a Carnot cycle, determine: 1) The rate of heat being rejected to the surrounding in kJ/min The coefficient of performance of this refrigeration process 11) 111) The minimum required power on this process (give your answer in kW)
A window air conditioner that consumes 1 kW of electricity when running and has a coefficient of performance of 3 is placed in the middle of a room and is plugged in. The rate of cooling or heating this air conditioner will provide to the air in the room when running is (a) 3 kJ/s, cooling (b) 1 kJ/s, cooling (c) 0.33 kJ/s, heating (d) 1 kJ/s, heating (e) 3 kJ/s, heating
A refrigeration system absorbs heat from a space at 5 ◦C at a rate of 25 kW and rejects heatto water in the condenser. Water enters the condenser at 15 ◦C at a rate of 0.84 kg/s. TheCOP of the system is estimated to be 1.75. Determine (a) the power input to the system,(b) the temperature of the water at the exit of the condenser, and (c) the maximum possibleCOP of the system. The specific heat of water is 4.18 kJ/kg·◦C.
Find the C.O.P. of a refrigeration system if the work input is 50 KJ/kg and refrigeration effect produced is 180 KJ/kg of refrigerant flowing. а. 3.60 O b. 3.00 О с. 3.75 O d. 3.25
A refrigerator absorbs 137 kJ/kg of heat from a cool compartment at -10°C and rejects heat to the kitchen air at 30 °C. The amount of work supplied to the refrigetator is 54 kJ/kg. i) Sketch the schematic diagram of the refrigerator system. ii) Calculate the COP of the refrigerator. iii) Determine whether this refrigerator is reversible, irreversible or impossible. iv) If the refrigerator is used as a heat pump, determine the COP of the heat pump.
5. Consider a building whose annual air-conditioning load is estimated to be 120,000 kWh in an area where the unit cost of electricity is $0.10/kwh. Two air conditioners are considered for the building. Air conditioner A has a seasonal average COP of 3.2 and costs $5500 to purchase and install. Air conditioner B has a seasonal average COP of 5.0 and costs $7000 to purchase and install. If all else are equal, determine which air conditioner is a better buy 120,000 kWh Air cond. A Air cond. B 'COP=5.0 COP 3.2 House 120,000 kWh
(b) An irreversible heat pump with COP of 2.4 is used to heat water to 80°C for cleaning purposes. This heat pump absorbs heat from surrounding at 30°C and received the entire power, W from a Carnot heat engine operating between 250°C and 30°C. The Carnot heat engine received 6.3 kW of heat from the high temperature source. i) Draw the schematic diagram of the above system. ii) Determine the power received by the heat pump, W from Carnot heat engine, kW. iii) Calculate the rate of heat supplied to the water by the heat pump, kW. iv) Determine the COP of the heat pump if it operates on a reversed Carnot cycle.
Ces An air-conditioning system operating on the reversed Carnot cycle is required to transfer heat from a house at a rate of 760 kJ/min to maintain its temperature at 24°C. If the outdoor air temperature is 35°C, determine the power required to operate this air-conditioning system. The power required to operate this air-conditioner system is kW.
Consider a building whose annual air-conditioning load is estimated to be 40,000 kWh in an area where the unit cost of electricity is RM0.10/kWh. Two air conditioners (Figure 2) are considered for the building. Air conditioner A has a seasonal average COP of 2.3 and costs RM5500 to purchase and install. Air conditioner B has a seasonal average COP of 3.6 and costs RM7000 to purchase and install. All else being equal, determine which air conditioner is a better buy. A Air cond. COP = 2.3 D Win House 40,000 kWh Figure 2 40,000 kWh B Air cond. COP = 3.6 Win