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 45, Problem 9RQ
The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.
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What are many different kinds and variations of the refrigeration cycle components؟
In a solar cooling vapor compression refrigerator system, which component absorbs the heat from the cold space?
Select one:
a. Condenser coils
b. Evaporator
c. Receiver
d. Compressor
The values of a vapor compression refrigeration cycle were given below. Calculate the values ofrefrigerant flow rate, refrigeration capacity, and the COP of the system.T1= Evaporator water outlet = 10 °CT2= Evaporator water inlet = 16 °CT3= Condenser water inlet = 16 °CT4= Condenser water outlet = 22°CCooling water flow rate = 1.5 L/minHeating water flow rate = 1.5 L/minEnthalpy of R134a in evaporator outlet = 305 kj/kg,Enthalpy of R134a in evaporator inlet =115 kj/kgEnthalpy of R134a in condenser inlet =327 kj/kg
Chapter 45 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 45 - The typical temperature inside the fresh-food...Ch. 45 - The operating condition for the single compressor...Ch. 45 - When the air temperature in a domestic freezer is...Ch. 45 - Typical head pressures should correspond to a...Ch. 45 - Using the temperature/pressure chart in Unit 3,...Ch. 45 - Using the pressure/temperature chart in Unit 3,...Ch. 45 - If a forced-draft evaporator fan motor is wired in...Ch. 45 - Frost accumulates on the evaporators of...Ch. 45 - The defrost cycle in a domestic refrigerator may...Ch. 45 - Prob. 10RQ
Ch. 45 - What are the two types of evaporators found in...Ch. 45 - Refrigerators currently being manufactured in the...Ch. 45 - Condensers in these refrigerators are...Ch. 45 - Home freezers are air-cooled and may have...Ch. 45 - Induced-draft condensers are typically used with...Ch. 45 - The capillary tube metering device is usually...Ch. 45 - Prob. 17RQCh. 45 - If the compressor has liquid refrigerant returning...Ch. 45 - Some freezers may have ______heaters to prevent...Ch. 45 - Welded ______sealed compressors are normally used...Ch. 45 - Special heaters called ______heaters are often...Ch. 45 - Prob. 22RQCh. 45 - Prob. 23RQCh. 45 - The adjustment device used for low atmospheric...Ch. 45 - Prob. 25RQ
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- A Carnot refrigeration cycle absorbs heat at 270 K and rejects it at 300 K. 1. Calculate the coefficient of performance of this refrigeration cycle. 2. If the cycle is absorbing 1130 kJ/min at 270 K, how many kJ of work is required per second ? 3. If the Carnot heat pump operates between the same temperatures as the abov refrigeration cycle, what is the coefficient of performance ? 4. How many kJ/min will the heat pump deliver at 300 K if it absorbs 1130 kJ/min at 270 Karrow_forwardDefine flash gas, and explain how it applies to the net refrigeration effect of the refrigeration cycle.arrow_forwardWhere is the only permanent suction line on a heat pump?arrow_forward
- An 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_forwardRefrigerant 22 is the working fluid in a Carnot refrigeration cycle operating at steady state. The refrigerant enters the condenser as saturated vapor at 36°C and exits as saturated liquid. The evaporator operates at -30°C. What is the coefficient of performance of the cycle? A 10 B 3.68 8.53 5arrow_forwardA conventional LiBr-water absorption cycle operates at the following temperatures: generator, 95oC; condenser, 40oC; evaporator, 5oC; and absorber, 35oC. The flow rate of solution delivered by the pump from the absorber to the generator is 0.45 kg/s. Determine the following:a. Refrigerating Capacityb. Coefficient of Performancec. Heat rejected in the Condenserd. Heat rejected in the Absorberarrow_forward
- 2. How is the refrigerant used in the Air refrigeration cycle?arrow_forwardHeat transferred from the higher and lower temperature reservoirs are and , respectively. Select the coefficient of performance for a refrigerator___________ A. 0.67 B. 1.5 C. 2.0 D. 0.5arrow_forwardDifferentiate refrigerator and heat pump.arrow_forward
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