An ideal multi pressure refrigeration system consists of 57 tons HP Evaporator at 9°C and 63 tons LP Evaporator at -26°C. The system uses 2-stage compression with intercooler with flash tank for the purpose of minimum works on compressors. A pressure reducer valve is installed after the HP Evaporator to equalize its pressure to that of intercooler. The condenser pressure is 40°C. The refrigerant is R22

An ideal multi pressure refrigeration system consists of 57 tons HP Evaporator at 9°C and 63 tons LP Evaporator at -26°C. The system uses 2-stage compression with intercooler with flash tank for the purpose of minimum works on compressors. A pressure reducer valve is installed after the HP Evaporator to equalize its pressure to that of intercooler. The condenser pressure is 40°C. The refrigerant is R22

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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Similar questions

When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.
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An R-404A system is operating with a -50F evaporator and the condenser is operating at 115F. What is the compression ratio of this system? A. 16.9 to 1 B. 17.8 to 1 C. 19.1 to 1 D. 21.33 to 1
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. 14F
A single compressor using ammonia as refrigerant has three evaporators of capacity 30 TR, 20 TR and 10 TR. The temperature in the three evaporators is to be maintained at -10°C, 5°C and 10°C, respectively. The system is provided with individual expansion valve and back pressure valves. The condenser temperature is 40°C. Assume isentropic compression: a. Draw the P-h diagram. b. What is the mass of refrigerant flowing through each evaporator? c. What is the power required to drive the compressor? d. What is the COP of the system?
5. A refrigeration system using R-12 as refrigerant consists of throe evaporators of capacities 20 TR at – 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated. The system is provided with individual compressors and multiple expansion valves. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is saturatoed. Assuming isentropic compression in each compressor, find (a) the mass of refrigerant flowing through cach evaporator, (b) the power required to drive the system, and (c) the C.O.P. of the system. [Ans. 27.4 kg/min, 42.25 kg/min: 34.12 kg/min; 38.4 kW; 5.56]
QUIZ 2 An ideal multi-pressure refrigeration system consists of two Compressors serving one 60 Tons Evaporator at -20°C. The system uses two-stage compression with intercooling and flash Tank. A pressure reducer valve reduces the condenser pressure to intercooler pressure. The condensing temperature is 47°C. The refrigerant is R22. Calculate (a) enthalpy leaving evaporator (b) enthalpy leaving LP compressor (c) enthalpy entering HP compressor
a standard vapor compression refrigeration system uses ammonia as refrigerant the amount of the evaporator negative 20 degrees centigrade on the condenser pressure is 1200 kpa. the flow rate is 30 kg/min. Determine a. the tons of refrigeration b. the power required c. the COP
Draw the Ts/Ph Diagram A 50-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to condense it at 40°C. The vertical compressor is to run at 10000 rpm; it is double acting, has the bore equal to the stroke, and has 10% clearance. Vapor enters the compressor at -10°C and liquid enters the expansion valve at 30°C. What refrigeration flow rate is required? What would be the bore and stroke of the compressor? What power is required by the compressor? What is the quantity of the cooling water required in the condenser for a 8-degree increase in temperature?
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