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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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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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardThe operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40Farrow_forwardAn important factor (or factors) involving water quality with regard to open-loop heat pump systems is(are) A. water temperature. B. water cleanliness. C. water volume in gpm. D. all of the above.arrow_forward
- The working temperature of a pair of heat pumps that are connected in series is between 300K and 600K degrees Celsius. When compared to the first heat pump, the efficiency of the second heat pump is three times higher. In this case, the second heat pump receives 20 kW of heat, and both the first and second heat pumps release 20 kW of heat. Calculate the input work for both heat pumps.arrow_forward. A carnot heat engine with thermal efficiency of 70% is supplied with heat at a rate of 800 kJ/min. If it is coupled to a carnot heat pump to deliver 1800 kJ/min of heating, determine the COP and temperature outside the house if it is maintained at 24Carrow_forwardA heat pump like the one shown in the figure is used to heat a house during the winter months. The temperature inside the house is always kept at 21 ° C. When the estimated heat loss from the house is 135000 kJ / h, the outdoor temperature is -5 ° C. What is the minimum power required to drive this heat pump unit?arrow_forward
- A heat pump with COP of 2.0 is used to heat water to 90 oC for cleaning purpose. This heat pump absorb heat from surrounding at 30 oC and received the entire power, ̇ from a Carnot heat engine operating between 200 oC and 25 oC. 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, ̇ 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.arrow_forwardA Carnot refrigeration cycle absorbs heat at 250 K and rejects it at 300 K Calculate- i) the coefficient of performance of this refrigeration cycle. ii) If the cycle is absorbing 1130 kJ/min at 270 K. how many kJ of work is required per second iii) If the Carnot heat pump operates between the same temperatures as the above refrigeration cycle, what is the coefficient of performance ?arrow_forwardThe energy leakage per unit time is 0.6 kW for each 1℃ temperature difference between a house to be heated with a 1kW heat pump and the outdoor environment. The coefficient of performance of the heat pump used to keep this house at a constant temperature of 20℃; half of the theoretical maximum heat pump performance coefficient; Calculate the minimum outdoor temperature in ℃ so that this heat pump can meet the need and be used.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_forwardThe power required to drive the compressor in a carnot refrigerator is 60hp. It operates between -8°C and 43°C. Determine the coefficient of performance.arrow_forwardA heat engine accepts heat from a source at a rate of 500 kW, and it rejects heat to a sink at a rate of 300 kW. The remainder of the heat is converted to net work output. Determine the thermal efficiency of the enginearrow_forward
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