Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 44, Problem 13RQ
If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7°F, how much heat in Btu/h is being absorbed or rejected in the heat pump? Show all work and units.
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A heat pump is used to heat a house. When the outside air temperature is 266K and the inside is maintained at 293K, the heat loss from the
house is 195 kW.
a. What is the minimum electric power (kW) required to operate the heat pump?
b. What is the rate of heat transfer to the heat pump?
C. What is the COP for an ideal heat pump operating between these temperatures?
If 14 gpm of water is flowing through an open-loop heatpump with a temperature difference of 78F, how muchheat in Btu/h is being absorbed or rejected in the heatpump? Show all work and units.
3) If the measurement parameters of a refrigeration machine are known, the amount of heat for liquid refrigerant (mix) when it enters the evaporator is 650 Btu/lb, the amount of heat for vapor refrigerant after it comes from the evaporator is 950 Btu/lb, and the amount of heat for superheat refrigerant after being compressed is 1280 Btu/lb. lb. Calculate the efficiency of the refrigeration machine?
Chapter 44 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 44 - Geothermal heat pumps, or water-source heat pumps,...Ch. 44 - An important factor (or factors) involving water...Ch. 44 - Explain the ground loop or water loop of a...Ch. 44 - Explain the refrigerant loop of a closed-loop,...Ch. 44 - The__________loop is used to distribute heated or...Ch. 44 - True or False: Domestic hot water can be heated...Ch. 44 - Prob. 7RQCh. 44 - Antifreeze solutions that can be used in the...Ch. 44 - What is the main difference between a copper and a...Ch. 44 - A(n) ______well draws water from the top of...
Ch. 44 - Which of the following is a process in which a...Ch. 44 - The function of the pressure tank in an open-loop,...Ch. 44 - If 14 gpm of water is flowing through an open-loop...Ch. 44 - Explain the operation/purpose of the buffer tank...Ch. 44 - How will oversizing the buffer tank on a...Ch. 44 - Explain why a waterless, earth-coupled,...Ch. 44 - Explain how refrigerant and oil leakage are found...Ch. 44 - What kind of material is used in the waterless...
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- 2) A heat pump with the amount of heat of liquid refrigerant (mix) when it will enter the expansion of 480 Btu/lb. while the amount of heat from the refrigerant vapor after leaving the evaporator is 412 Btu/lb. What is the coefficient of performance (COP) if the heat amount of the superheated refrigerant after being compressed by the compressor has a value of 572 Btu/lb?arrow_forwardA heat engine running between a pit at 15 degree and an energy storage that is 50 times warmer than the pitworks. 2/3 of the generated power is used to run the Carnot heat pump, which heats an home. Heatpump draws heat from the air at 4 degree and keeps the home at 15 degree. So the heat loss of homeis 61000 kJ / h;a. Describe the system by drawing it schematically.b. Calculate the minimum heat that should be transferred to the heat engine.arrow_forwardFind the rate at which heat is extracted from the refrigerated space.arrow_forward
- the 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_forward3.) When a gas surrounded by air is compressed or expands adiabatically, its temperature rises or decreased even though there is no heat input or dissipated to the gas. Where does the energy come from to raise or lower the temperature? 4.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in?arrow_forwardBased on the steam engine represented on the following figure, a) Describe the heat engine cycle and explain why it is useful. b) Describe the energy conversions that occur.arrow_forward
- Yeji just came back from dance practice and went straight to her bedroom. It was summer so the temperature in her bedroom was estimated to be around 40°C. She then turned her air conditioner on, closed her door and windows, and it cooled her bedroom to 18°C in 20 minutes. Calculate,a. How much heat was transferred to cool her bedroom to 18°C?b. What is the power consumption of the air conditioner, in kW?The air conditioner has a COP of 2.8. Assume the mass of her entire bedroom to be 750 kg of air, Cv = 0.72 kJ/kg.°C and Cp = 1.0 kJ/kg.°C.*Round off all answers to four decimal places*arrow_forwardE. Draw a heat transfer diagram showing the heat flow (where q is going) when you use an ice pack on an injury versus a heat transfer diagram showing the heat flow when you use a heat pack on an injury. Treat the ice or heat pack as the system.arrow_forwardFor each of the three heat pumps described, state whether it violates the First Law of Thermodynamics, the Second Law of Thermodynamics or neither. All three have a hot reservoir temperature of 400K and a cold reservoir temperature of 300K. a. 100J of work are done to the system. 200J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir. b. 50J of work are done to the system. 250J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir. c. 100J of work are done to the system. 100J of heat are pulled from the cold reservoir. 300J of heat are dumped into the hot reservoir.arrow_forward
- a. What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 55°C and a cold reservoir temperature of -22°C ? b. How much heat transfer occurs into the warm environment if 3.62 x 10' J is put into it?arrow_forwardA heat engine has a solar collector receiving 600 Btu/h per square foot, insidewhich a transfer medium is heated to 800 R. The collected energy powers aheat engine that rejects heat at 100 F. If the heat engine should deliver 8500Btu/h, what is the minimum size (area) of the solar collector?arrow_forwardA heat pump operates between 36 degrees fahrenheit and 120 degrees fahrenheit . If heat added from the low temp. region is 500 BTU/min. Find the horsepower needed for the compressor power.arrow_forward
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