Q.5 A standard vapor compression cycle uses R134a as the refrigerant. The condensing and evaporating temperatures are 40°C and 0°C respectively. The isentropic efficiency of the compressor is 80%. The refrigerant flow rate is 0.35 kgs¹. Calculate (i) the heat absorption rate, (ii) the work input to the compressor, and (iii) the COP of the cycle.
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- A standard vapor compression cycle using R134a as the working fluid has a condensing temperature of 40°C and an evaporating temperature of -5°C. The heat extraction rate is 25 kW. The process 1-2-3-4 describes the cycle with T-s and P-h diagrams shown below.A. Calculate the refrigerant flow rate in kg/s. B. Calculate the compressor work input in kW. C. Calculate the volume flow rate of refrigerant at the compressor inlet in m^3/s. D. Calculate the COP of the cycle. E. Calculate the COP of a Carnot refrigerator operating between the same temperatures.Q.6 A vapor compression cycle uses R134a as the refrigerant . The vapor condenses at 40 degrees * C and is subcooled to 35 degrees * C before entering the expansion valve . The evaporating temperature is - 5 degrees * C . The vapor leaving the evaporator is superheated to 5 degrees * C at entry to the compressor . The heat absorption rate is 13 kW and the compression process is isentropic . Calculate (i) the refrigerant flow rate, (ii ) the work input , and ( iii ) the COP . Answers: () 0.0837kg * s ^ - 1 , (ii) 2.63 kW , (iii) 4.95Steam enters the high-pressure turbine at 15,000 kPa and 873 K in a 15,000-kWsteam power plant that operates on an ideal reheat Rankine cycle. If the condenserpressure is at 10 kPa and the moisture content is 10.4% at the exit of the low-pressureturbine at 4 MPa, determine the cycle thermal efficiency, the specific steamconsumption, and the pump work in kW if the steam is to be reheated to the initialtemperature. Show Ts and PV diagrams
- A four-cylinder, 8 cm x 10 cm, single acting, V-type compressor operates at 600 rpm. Iti s used in a Freon-12 vapor compression system with condenser and evaporatort emperatures of 29OC and -14OC, respectively. If the compression is dry and isentropic,the clearance is 2 percent. (a) Draw the cycle schematic diagram and (b) draw the corresponding p-h diagram and determine (c) the refrigerating capacity in tons, (d) the heat given off in the condenser, and (e) the COP. The gas constant, k for R-12 is 1.126.If an ideal refrigeration cycle (using R-134a) operation at evaporator temperature -10 °C and Condenser temperature +30 °C, what is the dryness factor of the Refrigerant at entering evaporator?Air enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 270 K. The compressor pressure ratio is 3 and the temperature at the turbine inlet is 310 K. Determine:The above Brayton refrigeration cycle is modified by introducing a regenerative heat exchanger. In the modified cycle, the compressed air enters the regenerative heat exchanger at 310 K and is cooled to 280 K before entering the turbine. Determine for the modified cycle:f).the net work input per unit mass of air flow, in kJ / kg. g).the cooling capacity, per unit mass of air flow, in kJ / kg.h).the coefficient of performance.
- A steam power plant with a closed feedwater Heater operates on a regenerative Rankine cycle with reheating. Steam enters the turbine at 8 MPa pressure and 5YX C temperature, 1Y kg/s flow rate, and condenses in the condenser at 2X kPa pressure. The intermediate heating is condensing at a pressure of 3 MPa. Intermediate heating is done at a pressure of 3 MPa and the steam is heated to a temperature of 5X0 C. Some steam is separated from the low pressure turbine at a pressure of 1 MPa, after it is completely condensed in the closed feed water heater, it is pumped to a pressure of 8 MPa before mixing with the feed water at the same pressure. Assuming the isentropic efficiencies of the turbines and pumps are 8Y.X%, calculate (a) the temperature of the steam at the inlet of the closed feedwater heater, (b) the mass flow rate of the steam leaving the turbine for the closed feedwater heater, (c) the net power, and (d) the thermal efficiency.note: x=2,y=7In a Refrigerant 12 system which serves a 212 kw evaporator at - 30 0C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 400C . Given that, h2=356kJ/kg, h4=367kJ/kg Compute the following: a.) mass flow rate at low stage compressor (m1)ANSWER: 1.53661 kg/s b.) mass flow rate at high stage compressor (m3)ANSWER: 2.11791 kg/s c.) low stage compressor workANSWER: 27.43931 kw d.) high stage compressor workANSWER: 32.63926 kw e.) total compressor workANSWER: 60.078575 kw f.) COPANSWER: 3.52871 g.) heat rejected in the condenserANSWER: 272.07857 kwA vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 240 and 1600 kPa. The isentropic efficiency of the compressor is 78%. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COP
- A steam Rankine cycle operates between the pressure limits of 1500 psia in the boiler and 2 psia in the condenser. The turbine inlet temperature is 800F. The turbine isentropic efficiency is 90 percent, the pump losses are negligible, and the cycle is sized to produce 2500 kW of power. Calculate the mass flow rate through the boiler, the power produced by the turbine, the rate of heat supply in the boiler, and the thermal efficiency.A refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle. The evaporator and condenser pressures are 100 kPa and 1400 kPa, respectively. The isentropic efficiency of the compressor is 88 percent. The refrigerant enters the compressor at a rate of 0.022 kg/s superheated by 26.37°C and leaves the condenser subcooled by 4.4°C. Problem 11.021.b - Comparison to ideal vapor compression cycle 1) Determine the rate of heat removal from the refrigerated space 2) The rate of heat rejection from the refrigerant to the environment 3) The power input and the COP if the cycle is operated on the ideal vapor-compression refrigeration cycle between the same pressure limits. (Take the required values from saturated refrigerant-134a tables.)Vapor compression refrigeration system with 360 kJ/min cooling capacity with R134-a is working. The refrigerant enters the compressor as saturated vapor at 160 kPa. and compressed up to 850 kPa. If the compressor isentropic efficiency is 75% a) What is the degree of dryness of the refrigerant at the end of the throttling process? b) What is the COP of the system. c) What is the power consumed in the compressor [kW]