OoutCondenser45We2CompressorExpansionvalve-39-DirectEvaporator8.contacteatexchangerQin2= 10 tons-2ExpansionCompressorWe.1valve+7EvaporatorQin. = 5 tonsFIGURE P10.26a. the temperatures, in °F, of therefrigerant in each evaporator.b. the power input to eachstage, in horsepower.compressorc. the overall coefficient of performance. 10.26 WP Figure P10.26 shows a two-stage,vapor-compression refrigeration system withtwo evaporators and a direct-contact heatexchanger. Saturated vapor ammonia fromevaporator 1 enters compressor 1 at 18 lbf/in.?and exits at 70 lbf/in.? Evaporator 2 operatesat 70 lbf/in.?, with saturated vapor exiting atstate 8. The condenser pressure is 2002Ibf/in.?, and saturated liquid refrigerant exitsthe condenser. Each compressor stage has anisentropic efficiency of 80%. The refrigerationcapacity of each evaporator is shown on thefigure. Sketch the T-s diagram of the cycleand determine2

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Answered: a. the temperatures, in °F, of the…

a. the temperatures, in °F, of the refrigerant in each evaporator. b. the power input to each compressor stage, in horsepower. c. the overall coefficient of performance.

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 2RQ: The typical temperature relationship between a standard-efficiency air-cooled condenser and the...

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Question

Oout
Condenser
4
5
We2
Compressor
Expansion
valve
-3
9-
Direct
Evaporator
8.
contact
eat
exchanger
Qin2
= 10 tons
-2
Expansion
Compressor
We.1
valve
+7
Evaporator
Qin. = 5 tons
FIGURE P10.26
a. the temperatures, in °F, of the
refrigerant in each evaporator.
b. the power input to each
stage, in horsepower.
compressor
c. the overall coefficient of performance.

10.26 WP Figure P10.26 shows a two-stage,
vapor-compression refrigeration system with
two evaporators and a direct-contact heat
exchanger. Saturated vapor ammonia from
evaporator 1 enters compressor 1 at 18 lbf/in.?
and exits at 70 lbf/in.? Evaporator 2 operates
at 70 lbf/in.?, with saturated vapor exiting at
state 8. The condenser pressure is 200
2
Ibf/in.?, and saturated liquid refrigerant exits
the condenser. Each compressor stage has an
isentropic efficiency of 80%. The refrigeration
capacity of each evaporator is shown on the
figure. Sketch the T-s diagram of the cycle
and determine
2

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