Abstract
The exergy analysis of an air-standard Otto cycle with heat transfer loss is analyzed by using finite-time thermodynamics. The results showed that the heat transfer loss is responsible for a significant destruction of exergy. It is also shown that exergy efficiency and maximum power output increase with decreasing heat transfer loss. The results obtained in this paper may provide useful information for the maximum work available.
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Abbreviations
- A :
-
Constant related to combustion
- B :
-
Constant related to heat transfer
- C v :
-
Constant volume specific heat (J kg−1 K−1)
- e :
-
Specific exergy (kJ kg−1)
- E :
-
Exergy (kJ)
- G :
-
Gibbs free energy (kJ)
- h :
-
Specific enthalpy (kJ kg−1)
- k :
-
Ratio of specific heats
- m :
-
Mass (kg)
- P :
-
Pressure (kPa)
- q :
-
Heat transfer per unit mass (kJ kg−1)
- Q :
-
Heat transfer per unit working fluid mass per cycle (kJ kg−1)
- s :
-
Specific entropy (kJ kg−1)
- T :
-
Temperature (K)
- u :
-
Specific internal energy (kJ kg−1)
- v :
-
Specific volume (m3 kg−1)
- W :
-
Work per unit working fluid mass per cycle (kJ)
- γ :
-
Compression ratio
- η :
-
First-law efficiency,
- η II :
-
Second-law efficiency
- f :
-
Fuel
- max:
-
Maximum
- o :
-
Environment
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Özcan, H. The effects of heat transfer on the exergy efficiency of an air-standard otto cycle. Heat Mass Transfer 47, 571–577 (2011). https://doi.org/10.1007/s00231-010-0749-5
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DOI: https://doi.org/10.1007/s00231-010-0749-5