6-49 An air conditioner removes heat steadily from a house at a rate of 750 kJ/min while drawing electric power at a rate of 5.25 kW. Determine (a) the COP of this air conditioner and (b) the rate of heat transfer to the outside air.
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.A typical 200-m2 house can be cooled adequately by a 3.5-ton air conditioner whose COP is 4.0. Determine the rate of heat gain of the house when the air conditioner is running continuously to maintain a constant temperature in the house.An air conditioner with refrigerant-134a as the refrigerant is used to keep a large space at 20°C by rejecting the waste heat to the outside air at 37 °C. The room is gaining heat through the walls and the windows at a rate of 125 kJ/min while the heat generated by the computer, TV, and lights amounts to 0.7 kW. Unknown amount of heat is also generated by the people in the room. The condenser and evaporator pressures are 1200 and 500 kPa, respectively. The refrigerant is saturated liguid at the condenser exit and saturated vapor at the compressor inlet. If the refrigerant enters the compressor at a rate of 65 L/min and the isentropic efficiency of the compressor is 70%, determine (a) the temperature of the refrigerant at the compressor exit, (b) the rate of heat generated by the people in the room, (c) the COP of the air conditioner, and (d) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.
- 1. A geothermal-based trigeneration plant produces 2.5 MW of electricity, 1.8 MW of process heat, and 1.4 MW of cooling. Electricity is produced for a period of 7500 h, heating for 2500 h, and cooling for 2000 h per year. The energy of geothermal plant consumed in the plant is 4 × 107 kWh during an entire year period. Determine the annual average utilization factor of this plant.A heat pump is installed in a building to heat the space to a constant 22 ⁰C when the outdoor temperature is 15 ⁰C. The heating requirement at these conditions is 30 kW. The system uses R-410a as a refrigerant and operates according to an ideal vapor compression cycle as shown in the figures below. The saturation temperature of the refrigerant in the indoor coil is typically 20 ⁰C higher than the desired space temperature, and the saturation temperature of the refrigerant in the outdoor unit is typically 20 ⁰C lower than the outdoor temperature. (one of those coils is the condenser, the other is the evaporator) Determine the states at points 1 through 4.i) determine the rate of heat transfer into the cycle, and ii) evaluate the thermal efficiency of this system.
- Consider a building whose annual air-conditioning load is estimated to be 150,000 kWh in an area where the unit cost of electricity is $0.12/kWh. Two air conditioners are considered for the building. Air conditioner A has a seasonal average COP of 3.3 and costs $5500 to purchase and install. Air conditioner B has a seasonal average COP of 4.45 and costs $6500 to purchase and install. All else being equal, determine which air conditioner is a better buy.12- Enver Gezer sees that there is 32 ºC in the summer house and after operating the air conditioner, the temperature of the house becomes 20 ºC in 15 minutes. Calculate the electrical power drawn by the system since the air conditioning system has a COP of 2.5. The mass of the Air in the house is 800 kg. For air (CV: 0.72 kJ/kg ºC and Cp: 1.0 kJ/kg ºC) A-3,265 kWB-5,492 kWC-3,897 kWD-5,046 kWE-3,072 kW (Note: This question is Turkish) orginal question: 12- Enver Gezer yazın evinde 32 ºC olduğunu görmekte ve Klimayı çalıştırdıktan sonra evin sıcaklığı 15 dakika içerisinde 20 ºC olmaktadır. iklimlendirme sisteminin COP değeri 2.5 olduğuna göre sistemin çektiği elektrik gücünü hesaplayın . Evin içerisindeki Havanın kütlesi 800 kg dır. Hava için (CV :0.72 kJ/kg ºC ve Cp : 1.0 kJ/kg ºC )Subject : Thermofluid A well-sealed house left alone during the midday heat was found to be at 35oC. He turns on the air conditioner, which cools the entire house to 24oC in 30 min. If the COP of the air-conditioning system is 2.6, determine the power drawn by the air conditioner. An estimated of 750 kg of air is within the house for which cv = 0.72 kJ/kg·oC and cp = 1.0 kJ/kg·oC.
- A heat engine is operating on a Carnot cycle and has a thermal efficiency of 55 percent. The waste heat from this engine is rejected to a nearby lake at 60°F at a rate of 800 Btu/min. Determine (a) the power output of the engine, in Hp and (b) the temperature of the heat source. And draw the P-V and T-S diagram.An air conditioner using refrigerant-134a as the working fluid is used to keep the temperature of a room at 23°C by giving heat to the external environment at 37°C. The heat gain of the house from the walls and windows is 250 kJ/min; 900 W heat is emitted into the room from the computer, TV and lamps. The refrigerant enters the compressor with a flow rate of 100 L/min in the form of saturated vapor at 400 kPa pressure and leaves the compressor at 70°C at 1200 kPa pressure.a) Draw the cycle by showing the elements of the cycle.b) the actual COP value,c) The highest COP value,d) The smallest refrigerant can have for the same compressor inlet and outlet conditions.Calculate the volumetric flow.A refrigerant plant works between temperature limits of – 5°C (in the evaporator) and 25°C (in the condenser). The working fluid ammonia has a dryness fraction of 0.6 at entry to the compressor. If the machine has a relative efficiency of 50%, calculate the amount of ice formed during a period of 24 hours.The ice is to be formed at 0°C from water at 20°C and 6 kg of ammonia is circulated per minute. Specific heat of water is 4.187 kJ/kg and latent heat of ice is 335 kJ/kg.