Thermoeconomic and feasibility analysis of novel transcritical vapor compression-absorption integrated refrigeration system
2020
Jain, Vaibhav | Colorado, D.
In this paper, a novel structure of transcritical vapor compression-absorption integrated refrigeration system (TVCAIRS) is proposed based on its thermoeconomic viability. The integration of single effect vapor absorption refrigeration system (VARS) (with H₂O-LiBr fluid couple) in transcritical vapor compression refrigeration system (TVCRS) (with R744 refrigerant) provides a subcooling of 5 °C in the proposed configuration. Hence, the overall COP and exergetic efficiency of TVCAIRS is 28.6% and 26.9%, respectively higher than the equivalent standalone TVCRS with optimum gas cooler pressure and generator temperature. Besides, the requirement of external cooling water for the gas cooler, absorber and condenser cooling of TVCAIRS is 12.3% less than the equivalent TVCRS. The direction for the further process improvement of TVCAIRS is also presented. Further, the thermodynamic performance of proposed system is also investigated for low temperature refrigeration application and hot climate conditions. The comparative results showed that the present TVCAIRS is thermodynamically more efficient as compared to the equivalent TVCRS and conserves more water resources with effective recovery of waste heat for the sustainable development.The techno-economic analysis of proposed TVCAIRS shows a shorter breakeven point and payback period of 1.3 yr. and 1.8 yr., respectively with total annualized cost of INR 5,641,614 (17.8% less than the equivalent TVCRS). Further, selection diagram for TVCAIRS and equivalent TVCRS shows that TVCAIRS is more feasible as compared to the TVCRS under low temperature and hot climate conditions and its viability strongly increases, if financial incentives of reduced interest rate are offered with longer life designs and operation duty.
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