Answered: Data for steady-state operation of a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Data for steady-state operation of a vapor-compression refrigeration cycle with Refrigerant 134a as the
working fluid are given in the table below. State 1 is at the compressor inlet. The cooling capacity (i.e the
rate at which heat is removed from the cooled space) is 4.6 tons. 1 ton of refrigeration is equivalent to
211 kJ/min. Ignoring heat transfer between the compressor and its surroundings, sketch the ?-? diagram
of the cycle and determine
a) the mass flow rate of the refrigerant, in kg/min.
b) the isentropic compressor efficiency.
c) the coefficient of performance.
State ? (bar) ? (°C) ℎ (kJ/kg) ? (kJ/kg-K)

State
1
2
3
4
P (bar)
1.4
7
7
1.4
T (°C)
-10
58.5
24
-18.8
h (kJ/kg)
243.4
295.13
82.90
82.90
s (kJ/kg-K)
0.9606
1.0135
0.3113
0.33011

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