Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigerat...
An ideal vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 1.25 bar, and saturated liquid exits the condenser at 5 bar. The mass flow rate of refrigerant is 8.5 kg/min. A. Determine the magnitude of the compressor power input required, in kW (report as a positive number). B. Determine the refrigerating capacity, in tons. C. Determine the coefficient of performance. Please answer all parts of the question. Thanks!
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
A vapor compression refrigeration cycle utilizes R-134a as the working fluid. The refrigerant flow rate is 50 g/s. Vapor at 150 kPa and -10 0C enters the compressor and leaves at 1.2 MPa and 75 0C. The power input to the non-adiabatic compressor is measured and found to be 2.4 kW. The refrigerant enters the expansion valve at 1.15 MPa and 40 0C and leaves the evaporator at 160 kPa and -15 0C. Determine the entropy generation in the compression...
An ideal vapor-compression refrigerant cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at -10°C, and saturated liquid leaves the condenser at 28°C. The mass flow rate of refrigerant is 5 kg/min. Determine (a) The compressor power, in kW (b) The refrigerating capacity, in tons. (c) The coefficient of performance. Sketch the system on a T-s diagram with full label. A vapor-compression heat pump with a heating capacity of 500 kJ/min is...
An ideal vapor-compression refrigeration cycle with R-134a as the working fluid has an evaporator temperature of-15 °C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3.5 kg/min. Draw and label the cycle on a T-s diagram. What is the coefficient of performance? Ans. 2.98 What is the refrigerating capacity in tons? a. b. c.
A vapor compression refrigeration system operates at steady state with refrigerant 134a as the working fluid. Superheated vapor enters the compressor at 10 lbf/in2 , 0 oF. The liquid leaving the condenser is at 180 lbf/in2 , 100 oF. There is no significant pressure drop in the evaporator or condenser. For compressor efficiency of 83% and refrigeration capacity of 6 tons, determine (a) the compressor power input in horsepower, and (b) the coefficient of performance. A vapor compression refrigeration system...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
a) The coefficient of performance-of vapor-compression refrigeration cycles improves when the refrigerant is subcooled before it enters the throttling valve Can the refrigerant be subcooled indefinitely to maximize this effect, or is there a lower limit? Explain brieflyb) A two-stage compression refrigeration system with a flash chamber is used to produce chilled water for a commercial building The refrigeration system operates between a pressure limits of 1 2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves...
Refrigerant 134a is the working fluid in an ideal vapor-compression refrigeration cycle. Saturated vapor enters the compressor at h = 400 J/kg and saturated liquid leaves the condenser at h= 242 J/kg. If the mass flow rate of the refrigerant is 0.08 kg/s, and superheated vapor exits the compressor at h = 420 J/kg, pression work will be equal to 1.6 kW inch-h) 6.08(420 - 6oo) = 1.6
Problem 10.008 SI Refrigerant 22 enters the compressor of an ideal vapor-compression refrigeration system as saturated vapor at -30°C with a volumetric flow rate of 5 m/min. The refrigerant leaves the condenser at 19°C, 9 bar. Determine: (a) the magnitude of the compressor power, in kW. (b) the refrigerating capacity, in tons. (c) the coefficient of performance. (d) the rate of entropy production for the cycle, in kW/K. Part A Determine the magnitude of the compressor power, in kW. W....