Engineering, 28.07.2020 15:01, alanflores40
The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and 400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second laws of thermodynamics.
a) Qh=300 kJ, W(cycle)=160kJ, Qc=140 kJ
b) Qh=300 kJ, W(cycle)=180kJ, Qc=120 kJ
c) Qh=300 kJ, W(cycle)=170kJ, Qc=140 kJ
d) Qh=300 kJ, W(cycle)=200kJ, Qc=100 kJ
Answers: 3
) for a power cycle in term of the temperatures of hot and cold reservoirs and expressed in percentage:
, 
- Temperatures of cold and hot reservoirs, measured in kelvins.
and 
, the maximum theoretical thermal efficiency is:
- Heat absorbed by the heat engine from hot reservoir, measured in kilojoules.
- Heat released by the heat engine to the cold reservoir, measured in kilojoules. 
, 
and 
and 
and 
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