Performance optimization of three-heat-source irreversible refrigerators based on a new thermo-ecological criterion

Irreversible three-heat-source refrigerator with heat transfer law of QαΔ(T −1) and its performance optimization based on ECOP criterion

“…The proposed ecological objective function ECOP always has positive values and it is dimensionless just like the thermal efficiency in the heat engines or the coefficient of performance in the refrigerators and heat pumps. Very recently a performance analysis and optimization based on a new thermo-ecological optimization criterion (ECOP) has been performed for mechanical refrigerators [28,29] and irreversible three-heat-source absorption refrigerators with linear (Newtonian) heat transfer law [31].…”

“…Figure 1 [31] shows schematically the different components of an absorption refrigeration system. The main components are a generator, a condenser, an evaporator and an absorber.…”

“…The considered model is presented in Fig. 2 [31] where the temperatures of the working fluid in the three isothermal processes are different from those of the external heat reservoirs, so that heat is transferred under a finite temperature difference. In Fig.…”

“…It is assumed that the working fluid in the condenser and absorber has the same temperature T 3 . This assumption is reasonable because the working fluid in the condenser and absorber The irreversible cycle model of a three-heat-source absorption refrigerator [31] exchanges heat with heat sink at the same temperature in the considered three-heatsource model. Besides the irreversibility of the heat leak from the heat sink to the cooled space mentioned in the above analysis, a three-heat-source cycle model is also affected by external irreversibilities which is the result of the temperature differences required to transfer heat between the system and the heat source and sink, so that the linear law (Qα (T −1 )) used to analyze this system yields the governing equations:…”

Thermo-ecological analysis and optimization performance of an irreversible three-heat-source absorption heat pump

“…Therefore, ECOP index has an obvious benefit over the E criterion in the ecological approach and in term of entropy generation. Lately, a study for the optimization performance of the mechanical refrigerators [20] and absorption refrigerators [23][24][25][26][27][28] was performed based on an innovative thermo-ecological optimization principle. Solving multi-objective optimization problems is too difficult because the resulting different objective functions should be satisfied simultaneously while they may even conflict.…”