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Third approach in work loss phenomenon

. One of the most widespread irreversible processes in technique is the heat transfer from the higher to the lower body temperature. The main reason for this is due to the necessity of significant temperature difference in order to achieve a satisfactory process speed. Maximum work for the same heat amount (the same temperature level) will achieve reversible (ideal) system. The heat exergy represents maximum part of the heat that can be converted into work. In the system in which real processes take place, there is an increase of entropy and loss of work (exergy). This is the main reason for the low efficiency of the system for the transformation of heat energy into work. This phenomenon can be proven by different approaches. The first law of thermodynamics is mainly used for the analysis of energy utilization. The second law of thermodynamics and exergy analysis as its consequence, is more relevant for qualitative aspects of used or consumed energy. This paper presents third approach how exergy losses can be defined and its impacts on energy efficiency of the system.