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This review paper synthesizes and critically examines research on exergy analysis applied to heat pump systems, drawing from five key studies spanning experimental, simulation, and advanced analytical approaches. The reviewed works collectively address three major themes: the exergy performance of solar-assisted heat pumps with alternative refrigerants, thermodynamic optimization of solar-assisted space heating systems, and advanced exergy-based methodologies for characterizing and improving system irreversibilities. Across all studies, the evaporator or solar collector–evaporator assembly emerges as the primary site of exergy destruction, regardless of the system configuration or working fluid
employed. Advanced exergy analysis techniques—decomposing irreversibilities into avoidable/unavoidable and
endogenous/exogenous portions—provide substantially richer guidance for system improvement than conventional first- or second-law assessments alone. Comparative studies involving refrigerants R22, R433A (R290/R1270 blend), R410A, and R134a reveal meaningful differences in component-level efficiency and system-wide exergy destruction rates, influenced by thermophysical properties, environmental profiles, and operating conditions. Simulation-based investigations further demonstrate the role of collector type, storage tank sizing, and heat exchanger temperature differences in determining overall system COP and exergetic efficiency. Identified research gaps include limited exploration of dynamic seasonal performance, the absence of advanced exergy analysis for solar-integrated systems, and inadequate attention to hydrocarbon refrigerant safety integration. This review is intended to serve as a consolidated reference for researchers and engineers working toward thermodynamically efficient and environmentally responsible heat pump systems.
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"Exergy Analysis of Heat Pump Systems: A Review of Methodologies, Refrigerant Comparisons, and Performance Enhancement Strategies", International Journal for Research Trends and Innovation (www.ijrti.org), ISSN:2456-3315, Vol.11, Issue 4, page no.a608-a613, April-2026, Available :http://www.ijrti.org/papers/IJRTI2604086.pdf
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2456-3315 | IMPACT FACTOR: 8.14 Calculated By Google Scholar| ESTD YEAR: 2016
An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 8.14 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator