Page 53 - BASIC CONCEPTUAL OF THERMOFLUID
P. 53
Example 1
The figure above shows a certain process, which undergoes a complete cycle of operations.
Determine the value of the work output for a complete cycle, Wout .
Q in = +10 kJ W in = - 2 kJ
Q out = - 3 kJ W out = + (?) kJ
ΣQ = Q in + Q out ΣW = W in + W out
ΣQ = +10 + (-3) = 7 kJ ΣW = - 2 + (W) = W - 2 kJ
SQ = SW
7 = W - 2
W = 9 kJ
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