Refrigeration system operates on a vapor-compression cycle with R-134a as the working fluid. The refrigerant enter the compressor as superheated vapor at 0.1 Mpa and is compressed to 1 Mpa. If the isentropic efficiency of the compressor is 0.80and the superheat and subcooling are 10 C°. Mass flow rate of refrigerant is 0.05 kg/s. Determine QeQ, W & C.O.P
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- Q/ Refrigeration system operates on a vapor - compression cycle with R-134a as the working fluid. The refrigerant enter the compressor as superheated vapor at 0.1 Mpa and is compressed to 1 Mpa .The superheat and subcooling are 10 C°. Mass flow rate of refrigerant is 0.05 kg/s. Determine :- x4, Qe, Qc, Wc & C.O.P.A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator temperature of -10OC and a condenser temperature of 30OC. The refrigerant used is freon-12 and sub-cooled by 6OC before entering the expansion valve and vapor is superheated by 7OC before leaving the evaporator coil. The compression of refrigerant is isentropic. The refrigeration compressor is two-cylinder, single-acting with stroke equal to 1.25 times the bore diameter and operates at 1000 rpm. Determine: (a) refrigerating effect, (b) mass of refrigerant to be circulated, (c) theoretical piston displacement per minute, (d) theoretical power to run the compressor in kW, (e) heat removed from the condenser per min. (f) theoretical bore and stroke of compressor.Saturated vapor R22 refrigerant leaves the evaporator and enters the compressor at 131.68kPa. The refrigerant leaves the condenser as a saturated liquid at 40oC and enters theexpansion valve at 36oC. Heat rejected from the condenser amount to 105 kW. The work tothe compressor is 65 kJ/kg, while the heat loss from the compressor is 5.5 kJ/kg. A 7.4 kJkgof heat loss in piping between the compressor and condenser, Draw the p-h diagram(labeling the pressures and temperatures in each condition). Determine (a) the temperatureof refrigerant entering the condenser and (b) calculate the refrigeration capacity in tons.
- An ideal vapor compression cycle operates between the temperature limits of -5 °c and 30 °C and uses R134a as the refrigerant, which flows at a rate of 0.6 kg/s. The P-h- as well as T-s-diagrams that illustrate the refrigerating process is given in diagram, and respectively. Refigerant is compressed to the state in the compressor and heat is rejected in the condenser at constant for ideal Vapour compression cycle.A refrigeration system using refrigerant 12 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature is -15°C and the condensing temperature 30°C. Determine the volume flow of refrigerant measured in liters per second at the inlet to the compressor.Refrigerant 134a enters the compressor of a vapor-compression refrigeration cycle at 150 kPa as a saturated vapor and leaves at 850 kPa. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 7kW. a. Determine the mass flow rate of R-134a and the cop of the cycle. b. If the condenser pressure is changed to 950 kPa, find the cop of the cycle.
- In a R-134a based refrigeration system the cycle operates in the temperature range of 40°c and 20°c. Find COP of the system if the vapor is dry and saturated .while entering the compressor. Assume mass flow rate of refrigerant is 1 kg/s.A refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system. The heat exchanger cools the saturated liquid from the condenser from 32 deg C to 21 deg C with vapor which comes from the evaporator at -10 deg C. The compressor is capable of pumping 20 L/sec of refrigerant. What is the enthalpy of the refrigerant at the suction of the compressor neglecting the heat exchanger? What is the isenthalpic value of the refrigerant in the system neglecting the heat exchanger? What is the refrigerant's enthalpy after compression? What is the COP of the system neglecting the heat exchanger? What is the enthalpy of the refrigerant before it enters in the expansion valve? What is the approximate enthalpy of the refrigerant at the suction of the compressor? What is the estimated enthalpy of the refrigerant after compression? What is the COP of the system? What is the refrigerating capacity of the system in TOR if: a.) without hex and b.) with hex?Two evaporator compression refrigeration system as shown in the pricutre below uses refrigerant134a as a working fluid. Evaporator 1 operates at 0 ºC, evaporator 2 operates at -26.4ºC, and thecondenser operates at 800 kPa. The refrigerant is circulated through the compressor at a rate of 0.5kg/s and the low-temperature evaporator serves a cooling load of 10 kW. The refrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic efficiency is 95%. Determine a) the cooling rate of the high-temperature evaporator,b) the power required by the compressor, c) the COP of the cycle.