Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Chapter 5, Problem 5.10P
A window−mounted air conditioner removes 3.5kJ from the inside of a home using 1.75 kJ work input. How much energy is released outside and what is its coefficient of performance?
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Fundamentals Of Thermodynamics
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- A window-mounted air conditioner removes 2.1 kJ from the inside of a home using 1.75 kJ work input. What is its coefficient of performance? Note: thermodynamically, and air conditioner is the same thing as a refrigerator - it makes the inside of a container (house, refrigerator) colder.arrow_forwardthe energy transffered by heat from an engine during one cycle is 500J. how much energy must be added to the engine so that it can operate at 30 %arrow_forward29. The work steady flow for an open system is 3.12 HP. During steady flow process, the pressure of the working substance drops from 200 psia to 20 psia and the speed increases from 200 to 1000 fps. The internal energy decreases 25 BTU/lbm and the specific volume increases from 1 ft^3/lbm to 8 ft^3/lbm. Sketch the pV diagram and computenthe heat in HP for 10 lbm/min of the substance.arrow_forward
- 2) When the pressure increase lead to volume is A: Increase B: Decrease C: Constant Q7: An air conditioning system is used to maintain a house at a constant temperature of 20 C. The house is gaining heat from outdoors at a rate of 21000 kJ/h, and the heat generated in the house from the people, lights, and appliances amounts to 9000 kJ/h. For a COP of 2.4, determine the required power input to this air conditioning system. Your answerarrow_forwardThermal efficiency of a power cycle is 0.8. For the cycle, Wnet = 250 kJ. Determine Qout in kJ.arrow_forwardA heat engine with a thermal efficency of 45% rejects 500kJ/kg of heat. How much heat does it recieve?arrow_forward
- A domestic refrigerator with a COP of 1.2 removes heat from the refrigerated space at a rate of 60 kJ/min. Determine a) the electrical power consumed by the refrigerator and b) the rate of heat transfer to the kitchen air.arrow_forward1. A refrigerating system operates on the reversed Carnot Cycle. The higher temperature of the refrigerant in the system is 120°F and the lower is 10°F. The capacity is 20 tons. Neglect losses. Determine the network in Btu/min.arrow_forwardc) A refrigerator is used to keep the cold space at -5 °C by rejecting 8 kJ/s of heat by the condenser to the outdoor air at 25 °C. If the compressor consumes 3 kJ/s of power, determine the rate of heat removed from the cold space (kJ/s), the COP of the refrigerator i. ii. iii. the minimum power input to the compressor for the same rate of heat removed (kJ/s), and draw the schematic of the refrigerator as a reversed heat engine. iv.arrow_forward
- 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 kWharrow_forwardAn air conditioner on a summer day removes heat steadily from a house at a rate of 750 kJ/min while drawing electric power at a rate of 5.25 kW. Please answer the following. a. Create a schematic representation of the air conditioning system under consideration. b. Determine the COP of this air conditioner and the rate of heat transfer to the outside air. c. Now winter has come, and the owner decides to use the equipment as heat pump to warm the house. Because the house is not perfectly insulated, and the outside temperature is 0°C the estimated rate of heat transfer loss rate from the house to the surroundings is equal to 1200 kJ/min. Will the air conditioning unit operating as heat pump satisfy the required heating if the electrical power drawn is 5.25 kW? Explain how you arrived at the answer. d. If the heat pump would operate as a Carnot Heat Pump and the indoor temperature is 25°C while the outside temperature is 0°C, compute the COP.arrow_forwardA heat pump absorbs heat from the cold outdoors at 2° C and supplies heat to a house at 23° C at a rate of 36,000 kJ/hr. What is the COP of the heat pump if the power consumed is 1.7 kW? b. What is the maximum COP of the heat pump? а.arrow_forward
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