A vapor-compression refrigeration system operates on the cycle shown below. The refrigerant is tetrafluoroethane. For the following set of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). (Include a minus sign if required.) S Vapor-compression refrigeration cycle. Evaporation T = -6°C Condensation T = 26°C n(compressor) = 0.78 Refrigeration rate = 500 KJ-s-1 Throttle valve Condenser Compressor Evaporator 2

A vapor-compression refrigeration system operates on the cycle shown below. The refrigerant is tetrafluoroethane. For the following set of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). (Include a minus sign if required.) S Vapor-compression refrigeration cycle. Evaporation T = -6°C Condensation T = 26°C n(compressor) = 0.78 Refrigeration rate = 500 KJ-s-1 Throttle valve Condenser Compressor Evaporator 2

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter3: Refrigeration And Refrigerants

Section: Chapter Questions

Problem 2RQ: What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration...

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What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?
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The circulation rate of the refrigerant is The heat-transfer rate in the condenser is The power requirement is kW. kg-s-1 KJ-s-1
A vapor-compression refrigeration system operates on the cycle shown below. The refrigerant is tetrafluoroethane. For the following set of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). 3 Condenser T Throttle Compressor valve Evaporator Vapor-compression refrigeration cycle. Evaporation T= 0°C Condensation T= 26°C n(compressor) = 0.79 Refrigeration rate = 600 kJ-s-1 The circulation rate of the refrigerant is ]kg-s¬1 The heat-transfer rate in the condenser is kJ.s-1 The power requirement is kW. The coefficient of performance of the cycle is
A vapor-compression refrigeration system operates on the cycle shown below. The refrigerant is tetrafluoroethane. For the following set of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). (Include a minus sign if required.) S Vapor-compression refrigeration cycle. Evaporation T= -12°C Condensation T = 26°C n(compressor) = 0.77 Refrigeration rate = 400 kJ-s-1 The circulation rate of the refrigerant is The heat-transfer rate in the condenser is 4 KW. Throttle valve Condenser Evaporator kg-s -1 Compressor KJ-s-1 2 The power requirement is The coefficient of performance of the cycle is The coefficient of…
As shown below, a refrigeration cycle condenses a flow of ammonia from a saturated vapor at 4 barto a saturated liquid. The entering volumetric flow rate of the ammonia is 0.1 m3/s. The ammonia functions asthe cold reservoir for the refrigeration cycle, and the hot reservoir is at 25 ∘C. A faded specification sheet for therefrigeration cycle reads that the required power input is 35 kW.(a) Is this cycle possible? Why or why not?(b) If the cycle is impossible, how much work input is required to make the cycle
1. A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of - 5 degrees C and condensing temperature of 40 degrees C. Show the effects from a to e if the suction vapor is superheated to 15 degrees C. When superheating of suction vapor occurs inside the refrigerated space:a. the refrigerating effect per unit mass increases.b. the mass rate of flow per unit capacity decreases.c. the volume flow rate per unit capacity decreases.d. the theoretical power per unit capacity decreases.e. the COP increases.
A vapor compression refrigeration system operates on the cycle shown below (from Smith, Van Ness, and Abbott text). The refrigerant is tetrafluoroethane (P-H diagram from Smith, Van Ness, and Abbott text on next page). Determine the circulation rate of the refrigerant (in kg/s), the heat transfer rate in the condenser (in kW), the actual power requirement from compressor (in kW), the overall coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the following operating data: Evaporation T = -10°C; Condensation T = 26°C; Compressor Efficiency Factor = 0.8; Refrigeration rate = 500 kJ/s.
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A refrigeration plant that operates on the cycle shown below serves as a water chiller. Data on individual components are as follows: Evaporator: UA = 30.6 kW/K Condenser: Water flow rate = me = 6.8 kg/s UAC = 26.5 kW/K Water flow rate = mc = 7.6 kg/s The refrigeration capacity of the compressor is a function of the evaporating and condensing temperatures of the refrigerant, te and tc, respectively. That capacity is given as: qe [kW]= 239.5+ 10.073te - 0.109te²3.41tc - 0.00250tc²-0.2030tetc + 0.00820te²tc + 0.0013tetc²-8.0005x10-5 te²tc² The power consumed by the compressor is also a function of te and tc and is given as: P [kW] = -2.634 -0.3081te - 0.00301te²+ 1.066tc - 0.00528tc²- 0.0011tetc - 0.000306te²tc + 0.000567tetc² + 3.1x10-6t²tc² Appreciate that, due to the 1st Law of Thermo, the condenser must reject the energy added in both the evaporator and the compressor. Also, you can assume constant properties for the water (i.e., no temperature dependence). a) Set up the equations…