For a heat engine working between two heat reservoirs, a hot reservoir at high temperature T_{H} and a cold reservoir at low temperature T_{L}, an effective temperature and an effective efficiency are introduced.
The effective temperature is defined as the square root of the ratio between the net work output of the heat engine w_{net} and the SOT function (a new function introduced in this article). The SOT function is defined as the negative of the cyclic integral of the heat transfer change divided by the square of the temperature.
The effective efficiency of the heat engine is defined (a novel definition) as one minus the ratio between the low temperature and the effective temperature.
The effective temperature and the effective efficiency are worked out in details for the Carnot heat engine and the air standard cycles (Otto, Brayton, Stirling, and Ericsson).
It was found for the considered cycles that the effective temperature is given by the expression () and the effective efficiency is given by the expression () for all the considered cycles.
The importance of these two proposed measures is twofold: educational and they could be used as a quick tool by the designer.
Birincil Dil  en 

Konular  Mühendislik ve Temel Bilimler 
Dergi Bölümü  Regular Original Research Article 
Yazarlar 

Bibtex  @araştırma makalesi { ijot414698,
journal = {International Journal of Thermodynamics},
issn = {13019724},
eissn = {21461511},
address = {Yaşar DEMİREL},
year = {2018},
volume = {21},
pages = {158  172},
doi = {10.5541/ijot.414698},
title = {Effective temperature and performance characteristics of heat engines},
key = {cite},
author = {huleihil, mahmoud}
} 
APA  huleihil, m . (2018). Effective temperature and performance characteristics of heat engines. International Journal of Thermodynamics, 21 (3), 158172. DOI: 10.5541/ijot.414698 
MLA  huleihil, m . "Effective temperature and performance characteristics of heat engines". International Journal of Thermodynamics 21 (2018): 158172 <http://dergipark.gov.tr/ijot/issue/38992/414698> 
Chicago  huleihil, m . "Effective temperature and performance characteristics of heat engines". International Journal of Thermodynamics 21 (2018): 158172 
RIS  TY  JOUR T1  Effective temperature and performance characteristics of heat engines AU  mahmoud huleihil Y1  2018 PY  2018 N1  doi: 10.5541/ijot.414698 DO  10.5541/ijot.414698 T2  International Journal of Thermodynamics JF  Journal JO  JOR SP  158 EP  172 VL  21 IS  3 SN  1301972421461511 M3  doi: 10.5541/ijot.414698 UR  http://dx.doi.org/10.5541/ijot.414698 Y2  2018 ER  
EndNote  %0 International Journal of Thermodynamics Effective temperature and performance characteristics of heat engines %A mahmoud huleihil %T Effective temperature and performance characteristics of heat engines %D 2018 %J International Journal of Thermodynamics %P 1301972421461511 %V 21 %N 3 %R doi: 10.5541/ijot.414698 %U 10.5541/ijot.414698 
ISNAD  huleihil, mahmoud . "Effective temperature and performance characteristics of heat engines". International Journal of Thermodynamics 21 / 3 (Eylül 2018): 158172. http://dx.doi.org/10.5541/ijot.414698 