1. A reversible process has been defined as a process, which having taken place,
ID: 2998025 • Letter: 1
Question
1. A reversible process has been defined as a process, which having taken place,
can be reversed and in so doing leaves no change in either the system or the
surroundings. Six restrictions were imposed
a. no friction
b. heat transfer occurs only for infinitesimal temperature differences
c. unrestrained expansion does not occur
d. no mixing
e. no turbulence
f. no combustion
Choose a process for which one of these restrictions is relaxed and discuss how
this process is not reversible.
2. Thirty five (35) kilograms of chicken is to be frozen in a household freezer.
The chicken is at 15?C when it is placed in the freezer and reaches -20?C (well
below the freezing point) in 3 hours. If the COP of the freezer is 4.3 during this
process, determine the required power input (in kW).
Hint: You will need to perform a first law analysis on the chicken to determine
the QL for the refrigerator. Some properties of the chicken that will be useful:
Freezing point for the chicken: -2.8
Explanation / Answer
1. d
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