two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,

two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 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

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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(1) A two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,- (c) 116.08 kW, (d) 2.73, (e) 10.37%
a two-stage cascade refrigeration system uses ammonia as the refrigerant. The mass flowrate in the high-pressure loop is 0.2 kg/s. The condenser saturated temperature is 38 C andthe evaporator temperature is – 30 C. The cascade condenser is a direct-contact type with apressure of 355.71 kPa. Sketch the schematic diagram of the cascade system and determine(a) the refrigerating effect in tons, (b) the power required in each compressor in kW and (c)the COP.
The required refrigeration capacity of a vapour compression refrigeration system (with R-22 as refrigerant) is 100 kW at –30 C evaporator temperature. Initially the system was single-stage with a single compressor compressing the refrigerant vapour from evaporator to a condenser operating at 1500 kPa pressure. Later the system was modified to a two-stage system operating on the cycle shown below.At the intermediate pressure of 600 kPa there is intercooling but no removal of flash gas. Find: a) Power requirement of the original single-stage system; b) Total power requirement of the two compressors in the revised two-stage system.Assume that the state of refrigerant at the exit of evaporator, condenser and intercooler is saturated, and the compression processes are isentropic.
8.) Two-stage cascade refrigeration system uses R-22 as the working substance. The evaporator is at - 20C and the high pressure condenser is at 775 kPa. The cascade condenser is direct contact type. The refrigeration load is 70 tons. Determine (a) Mss flow rate in lower pressure loop (b) mass flow rate in a high pressure loop (c) COP
a two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,- (c) 116.08 kW, (d) 2.73, (e) 10.37% IN EES
. A two-stage cascade system uses ammonia as the refrigerant. The evaporator is at -30OC temperature and the condenser in the high-pressure system is at 1514.3 kPa pressure. The cascade condenser is a direct contact type and has a refrigeration load of 100 TR. Determine: a) The mass flow rate of refrigerant in the low pressure and the high pressure systems. b) The total power required c) The heat removed in the condenser d) The COP of the system