2. A simple vapor compression cycle uses 2.43 kg/min of ammonia refrigerant for the system. The operating conditions are 25°C and -20°C (condenser and evaporator temperatures, respectively). Determine the ff: • Enthalpy at each point of the cycle • Refrigerating Effect • Compressor Work • Energy Rejected • Refrigerating capacity in TOR • Compressor Power • Heat Rejected . Coefficient of Performance • Draw the P-h Diagram with labels Note: Draw the P-h Diagram with labels. Show your system balancing for checking.

2. A simple vapor compression cycle uses 2.43 kg/min of ammonia refrigerant for the system. The operating conditions are 25°C and -20°C (condenser and evaporator temperatures, respectively). Determine the ff: • Enthalpy at each point of the cycle • Refrigerating Effect • Compressor Work • Energy Rejected • Refrigerating capacity in TOR • Compressor Power • Heat Rejected . Coefficient of Performance • Draw the P-h Diagram with labels Note: Draw the P-h Diagram with labels. Show your system balancing for checking.

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?
1) A vapor compression cycle using Ammonia as refrigerant operates at an evaporating temperature of -5 deg. Centigrade and a condensing temperature of 35 deg. Centigrade. The liquid Ammonia was subcooled before entering the thermostatic expansion valve (TEV) to 30°C and the suction vapor was superheated to 20°C without useful cooling. Determine a) the Coefficient of Performance of the cycle. For 15 TOR determine b) the power required by the compressor c) the heat rejected in the condenser d) volume flow rate at the suction.
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.) T 4 S Vapor-compression refrigeration cycle. Evaporation T = -6°C Condensation T = 26°C 2 4 Throttle valve Condenser 3 Compressor Evaporator 2 n(compressor) = 0.78 Refrigeration rate = 500 kJ.s-1 The circulation rate of the refrigerant is 3.18 kg-s-1. The heat-transfer rate in the condenser is -607.6 kJ.s-1 The power requirement is 103.2417 KW. The coefficient of performance of the…
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…
Q2/ A vapor-compression refrigeration system operates on the cycle. The refrigerant is tetrafluoroethane. For Evaporation T = 0°C; condensation T = 26°C; n(compressor) = 0.79; refrigeration rate = 600 kJ-s—1., determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle
1. Compare the COP, Refrigeration Capacity and Heat Rejection Ratio (Heat rejection rate/Heat Absorption rate) of an ideal Carnot refrigeration cycle with that of a Vapor Compression refrigeration cycle for Refrigerant 12 at condensing and evaporating temperatures of 40°C and -5°C respectively.
A refgeration plant working on a sinple vapour compression cycle with pressure limits of 2.1 bar and 13.5 bar produces q cooling effect of 50kw. The refrigerant is dry saturated at the exit of evaporator and saturated liquid at the exit of condenser. Determine the power required by the compressor to run the refigeration plant . The properties of the refrigerant is given below. Take the specific heat of refrigerant vapour as 2.903 kJ/kg K
Type: E 1. A vapor-compression refrigeration cycle uses R-134a as its refrigerant. The R-134a enters the compressor as a saturated liquid at 200 kPa, and exits the condenser as a saturated liquid at 800 kPa. The rate of refrigeration of the cycle is to be 3.0 tons of refrigeration. Determine the coefficient of performance of the device as a refrigerator and the mass flow rate of R-134a needed for (a) an isentropic compressor, and (b) an isentropic compressor efficiency of 0.75.
Additional Instructions: Define each enthalpy obtained from tables and chart and draw the p-h diagram labeling the respective evaporating and condensing pressures and temperatures in each problem. Simple Vapor Compression Refrigeration System 53 PROBLEMS (1) An ammonia vapor refrigeration cycle operates at an evaporator temperature of-16 C and a condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal saturation eycle, (b) for wet compression with saturated vapor leaving the compressor, and (c) if the vapor at suction to the compressor is superheated 6 degrees. Ans. (a) 4.50, (b) 4.70, (e) 4.28
3 of 3 Seatwork 1 Vapor Compression < State Expansion valve The figure below provides steady-state operating data for an ideal vapor- compression refrigeration cycle with Refrigerant 134a as the working fluid. The mass flow rate of refrigerant is 30.59 lb/min. Hot region lout Condenser - / 40 Compressor m₁ = 30.59 Evaporator lin Cold region E lb min 01:24: 03 T h S р (lbf/in.2) (°F) (Btu/lb) (Btu/lb ºf