Refrigerant 134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by ait. The air enters at 100 kPa and 27°C with a volume flow rate of 600 m/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the retrigerant.
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Q: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air…
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Q: Saturated vapor enters the turbine at 8.0 MPa and exits 0.008 MPa. The turbine has an isentropic…
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A: ANSWER MASS FLOWRATE 0.808 Kg/s Solution is given below.
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- The condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14FWhen a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.Condensers in these refrigerators are all_______cooled.
- Why is two-stage compression popular for extra-low-temperature refrigeration systems?What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?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 .
- 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…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).An engine with incomplete-expansion is supplied with steam at 2.75 MPa and 260C.Release occurs at 0.35 MPa and the condenser temperature is 42C. (a) If the brake efficiency is 60% and if 1225 kg/h of steam are used, what is the brake power in kW? (b) If the mechanical efficiency is 87%, what is the indicated steam rate? (c) If the engine drives a generator whose efficiency is 92%, what are the combined thermal efficiency and the combined steam rate?
- A refrigerant 12 refrigeration system requires a load of 54 kW at an evaporator pressure of 270 kPa and a condenser pressure of 1009 kPa. The refrigerant is subcooled 10 degrees before entering the expansion valve and vapor is superheated 14 degrees before entering the compressor A twin-cylinder compressor with stroke equal to 1.25 times the bore is to be used at a speed of 27 r/s The volumetric efficiency is 84 per cent. Determine (a) the quantity of cooling water in the condenser for an 11-degree increase in temperature, (b) the bore and stroke, and (c) the compressor power. Ans (a) 1.40 kg/s, (b) 8.58 x 10.73 cm, (e) 10.5 kWQ1 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.