A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by a steam ejector which pumps vapor to a condenser. condensate is removed by a condensate to an air vent. warm return water enters the flash chamber at 13 c, chilled water comes out of the flash chamber at 5 c. vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32 c. for 350 kw of refrigeration. a) how much chilled water at 5 deg C does this system provide b) how much make up water is needed c) how much vapor must the system ejector remove from the flash chamber answers: a) 10.41 kg/s b) 0.1521 kg/s c) 21.7 kg/s

A vacuum refrigeration system consists of a large insulated flash chamber kept at low pressure by a steam ejector which pumps vapor to a condenser. condensate is removed by a condensate to an air vent. warm return water enters the flash chamber at 13 c, chilled water comes out of the flash chamber at 5 c. vapor leaving the flash chamber has a quality of 0.97 and the temperature in the condenser is 32 c. for 350 kw of refrigeration. a) how much chilled water at 5 deg C does this system provide b) how much make up water is needed c) how much vapor must the system ejector remove from the flash chamber answers: a) 10.41 kg/s b) 0.1521 kg/s c) 21.7 kg/s

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 22RQ: Variable refrigerant flow systems sense the ______and _____of the refrigerant to determine the...

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Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? What is the enthalpy of stream 4? Hot Side 6 5 Condenser 2nd Stage Compressor Throttle Valve 7 Flash Chamber Vapor Phase Only 1st Stage Compressor 8 Throttle Valve Evaporator 1 2 Cold Side
Q.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic is meters inlet at the to the compressor. second per (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.
draw the schematic diagram only A vacuum refrigeration system consists of a large insulated flash chamber kept at a low pressure by a steam ejector which pumps vapour to a condenser. Condensate is removed by a condensate to an air vent. Warm retum water enters the flash chamber at 13°C, chilled water comes out of the flash chamber at 5 C. Vapour leaving the flash has a quality of 0.97 and the temperature in the condenser is 32°C. For 350 kW of refrigeration.
3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.
Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar. High-P turbine Low-P turbine Reheater Boiler P4 = P3 = Pret reheat Condenser find the specific heat input of the system in kJ/kg to 2.d.p. ?
A refrigeration system like the one shown in the figure, in cascade uses R-22 refrigerant in the low temperature part of the system (B) and 134a refrigerant in the high temperature circuit (A). The R-22 refrigerant circuit operates between 1.1 and 5 bar.The enthalpies of the saturated vapor that leaves the evaporator at -39 ºC, of the superheated vapor that leaves the isentropic compressor at 29 ºC, and of the liquid that enters the throttling device at 0 ºC are 267.37; 304.16 and 78.47 respectively.The ideal cycle of the refrigerant circuit 134a operates between -12 ° C and 9 bar. The cooling capacity of the low temperature evaporator is 5 Ton. The COP of the cascade system is 2.13. Determine:a) the mass flows, in Kg / hr, in the two circuits. b) the input power in both compressors, in Kw c) Also determine the COP of a cycle with a single circuit using refrigerant 134a between -40 ºC and 9 bar.
A refrigeration system like the one shown in the figure, in cascade uses R-22 refrigerant in the low temperature part of the system (B) and 134a refrigerant in the high temperature circuit (A). The R-22 refrigerant circuit operates between 1.1 and 5 bar.The enthalpies of the saturated vapor that leaves the evaporator at -39 ºC, of the superheated vapor that leaves the isentropic compressor at 29 ºC, and of the liquid that enters the throttling device at 0 ºC are 267.37; 304.16 and 78.47 respectively.The ideal cycle of the refrigerant circuit 134a operates between -12 ° C and 9 bar. The cooling capacity of the low temperature evaporator is 5 Ton. Determine:a) the mass flows, in Kg / hr, in the two circuits. b) the input power in both compressors, in Kw,c) the COP of the cascade system.
Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar. High-P turbine Low-P turbine Reheater Boiler -o P4 = P3 = Preheat Condenser Use file 4 to answer quesion 4 to find the thermal efficiencyof the systemin percentage to 2.d.p. ? Ifo