FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Problem 4.01. A carnot refrigerator (carnot cycle heat pump in reverse) operating between Th and Te is
used to cool and freeze a bottle of water, volume V, at a temperature To < Th to freezing temperature T
(known density Pw, heat capacity cw). (a) Find the work required to cool and freeze the water. (b) Find
the change in entropy in the heat baths, and use it to place a limit on the change in entropy of the water
(without calculating the entropy change in the water).
The C.O.P. of a carnot refrigerator:
KR=
Qc
=
W
Te
Th-Te
9. Air is expanded from 400 kPa, 600 K in a polytropic process to 150 kPa, 400
K in a piston cylinder arrangement. Find the polytropic exponent n and the
work and heat transfer per kg air using constant heat capacity.
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