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8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

COMPARATIVE ASSESSMENT OF VARIOUS DUAL-PHASE CYCLES USED FOR SPACE-COOLING

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DOI: 10.1615/TFEC2023.rfs.046500

Abstract

With rapid technical advancements and escalation of energy demand, several space-conditioning techniques have suffered substantial developments. Space-conditioning techniques may be bifurcated into space-heating and space-cooling duties. This paper offers an assessment of various space-cooling methodologies of building thermal comfort. In particular, vapour compression (VC), vapour absorption (VA), vapour adsorption, evaporative cooling, and ejector cooling systems have been compared on the basis of three performance criteria involving coefficient of performance (COP), exergetic efficiency along with cooling power density (CPD). In this study, emphasis has been given on various dual-phase cycles used for space-cooling purpose. It has been highlighted that the evaporative cooling technique performs the best in terms of COP, whereas, VC is more suitable in terms of CPD feature. But, exergetic performances of evaporative cooling and the VA systems are observed to be better than the VC system. For high temperature and humid conditions, despite low COP, VA systems are found to be nearly 20.4 % more efficient in terms of exergetic criterion than the VC systems. Interestingly, from compactness aspect, VA-based systems are found to be around 15 % larger than widely used VC systems, and as such, VA systems offer prominent prospects to operate using renewable energy sources in near future. From the viewpoint of the studied performance metrics, ejector cooling systems are not found to be attractive.