An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800kPa and the evaporator at -12°C. Determine the amount of power (kW) required to service a 5838.1kW cooling load.
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- An R134a compressor with a bore of 10 cm and stroke of 10 cm runs at 750 rpm . The clearance volume ratio is 0.04 . It runs between the evaporator and condenser temperatures of -6 ° C and 40 ° C respectively . The isentropic index of compression is 1.35 . ( a ) Determine the mass flow rate , refrigeration capacity , and work requirement . Compare the results of the isentropic work with that determined via superheat table .Q1 Consider a two-stage compression refrigeration system operating between the pressure limits of 0.8and0.14 MPa(see Fig. Q 2). The working fluid isrefrigerant -134a. The refrigerant leaves thecondenser as a saturated liquid and is throttled to aflash chamberoperating at0.4 MPa. Part ofthe refrigerant evaporates during this flashing process, and this vapour is mixed with the refrigerantleaving the low-pressure compressor. The mixture is then compressed to the condenser pressure bythe high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure,and it cools the refrigerated space as it vaporizes in the evaporator. Assuming the refrigerant leavesthe evaporator as saturated vapor and both compressors are isentropic, determine(a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber,(b) the amount of heat removed from the refrigerated space and the compressor work per unit massof refrigerant flowing through the…Q1.2 Consider a two-stage compression refrigeration system operating between the pressure limits of 0.8and0.14 MPa(see Fig. Q 2). The working fluid isrefrigerant -134a. The refrigerant leaves thecondenser as a saturated liquid and is throttled to aflash chamberoperating at0.4 MPa. Part ofthe refrigerant evaporates during this flashing process, and this vapour is mixed with the refrigerantleaving the low-pressure compressor. The mixture is then compressed to the condenser pressure bythe high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure,and it cools the refrigerated space as it vaporizes in the evaporator. Assuming the refrigerant leavesthe evaporator as saturated vapor and both compressors are isentropic, determine(a) the coefficient of performance (COP).Re-draw the schematic diagram and sketch the cycle accurately on a T-s diagram with the propertyvalues labelled at all state points.
- A vapour compression refrigeration plant, which uses refrigerant-134aoperates at an evaporator pressure of 240 kPa and a condenser pressureof 1.2 MPa. The refrigerant leaves the evaporator at 0oC and exits thecondenser at 40oC. The two-stage compression is isentropic. Therefrigerant that leaves the condenser is throttled to a flash chamber with asaturation temperature of 15.71oC. Saturated vapour is extracted from theflash chamber and mixes with the refrigerant that leaves the low-pressurecompressor, before entering the high-pressure compressor. Saturatedliquid from the flash chamber is throttled to the evaporator. If therefrigeration load is 500 kW, determine the: a) mass flow rate of refrigerant through the condenser (kg/s),b) mass flow rate of refrigerant extracted from the flash chamber (kg/s)c) Power required by the low pressure compressor (kW).A 1200 kW water-cooled chiller has a centrifugal compressor with refrigerant R134a as the working fluid. The compressor runs at 9600 rev/min and has a slip factor of 0.95 and an overall isentropic efficiency of 90%. The impeller tip speed is not to exceed 160m/s. The evaporating and condensing temperatures are 2°C and 40°C respectively. Assuming that there is no superheating and sub-cooling, a) sketch the refrigration cycle on a P-h diagram (please indicate the pressures and specific enthalpies of all points in the cycle); b) determine the mass flow rate of the refrigerant R134a; c) determine the coefficient of performance of the chilled water plant; and discuss the possible measures to uplift the plant COP d) determine the number of stages and the impeller tip diameters, assuming that all stages would share same work input and each stage compression would have the same impeller tip diameter. e) Please also comment how the slip factor can affect the energy performance of the…The ice industry to produce its raw material considers an ideal vapor compression refrigeration cycle with refrigerant 134a as the working fluid due to its advantages ofdriving.The operating conditions of the refrigeration cycle require an evaporator pressure of 140 kPa and a condenser pressure of 1,200 kPa. In addition, there is cooling waterflowing through jackets (small tubes) surrounding the condenser, and is supplied at a rate of 245 kg/s.This cooling water has a temperature rise of 11.7°C as it flows through the water jacket.To produce ice, potable water is injected into the chiller section of the refrigeration cycle (evaporator). For each kg of ice produced, 324 kJ of energy must be removed from the supplied drinking water.a) Determine the mass flow rate of the refrigerant, in kg/s.b) Determine the mass flow rate of the drinking water supply, in kg/s.c) Make the T vr S Diagram, include all the results.
- A vapor compression cycle with R-134a is being used as its refrigerant. The refrigerant leaves the evaporator at -10 C and 120 kPa and it enters the condenser 1.0 MPa. Assuming there is a heat loss due to compression which is equal to 20 kJ/kg, and it has a cooling capacity of 75 tons of refrigeration, Determine the following: (a)heat rejected (b)cooling effect (c)work of compression (d) coefficient of performance (e)volume flow rate of refrigerant (f)compressor discharge temperatureConsider a two-stage compression refrigeration system operating between the pressure limits of 0.8 and 0.14 MPa. The working fluid is refrigerant-134a. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure, and it cools the refrigerated space as it vaporizes in the evaporator. Assuming the refrigerant leaves the evaporator as saturated vapor and both compressors are isentropic, determine (a)the fraction of the refrigerant that evaporates as it is throttled to the flash chamber, (b)the amount of heat removed from the refrigerated space and the compressor work per unit mass of refrigerant flowing through the condenser,…Consider an ice-producing plant that operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working fluid. The refrigeration cycle operating conditions require an evaporator pressure of 180 kPa and the condenser pressure of 1400 kPa. Cooling water flows through the water jacket surrounding the condenser and is supplied at the rate of 250 kg/s. The cooling water has a 10°C temperature rise as it flows through the water jacket. To produce ice, potable water is supplied to the chiller section of the refrigeration cycle. For each kg of ice produced, 333 kJ of energy must be removed from the potable water supply. (Take the required values from saturated refrigerant-134a tables.) Determine the mass flow rate of the refrigerant, in kg/s. Take cp of water as 4.18 kJ/kg·K. (You must provide an answer before moving on to the next part.) The mass flow rate of the refrigerant is _________kg/s.
- Consider an ice-producing plant that operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working fluid. The refrigeration cycle operating conditions require an evaporator pressure of 180 kPa and the condenser pressure of 1400 kPa. Cooling water flows through the water jacket surrounding the condenser and is supplied at the rate of 250 kg/s. The cooling water has a 10°C temperature rise as it flows through the water jacket. To produce ice, potable water is supplied to the chiller section of the refrigeration cycle. For each kg of ice produced, 333 kJ of energy must be removed from the potable water supply. (Take the required values from saturated refrigerant-134a tables.) Determine the mass flow rate of the potable water supply, in kg/s. The mass flow rate of the potable water supply is_______ kg/s.In 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 simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of-5C and a condensing temperature of 40℃.For refrigerating capacity of 30 kw, determine the work of the compressor. At 40°℃,hf=238.5 kJ/kg;at-5C,hg =349.3 kJ/kg,.Enthalpy entrance to the condenser is 372 kJ/kg.