Performance Assessment and Working Fluid Selection for Novel Integrated Vapor Compression Cycle and Organic Rankine Cycle for Ultra Low Grade Waste Heat Recovery

Sustainability

Michael K. H. Leung¹  Jamal Umer²  Abdul Wasy Zia³  Faiza Kashif⁴  Muhammad Imran⁵  Jahan Zeb Alvi⁶  Sheheryar Khan⁷  Muhammad Asim⁷ 

[1] Ability R & D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong;Department of Mechanical Engineering, University of Engineering & Technology, Lahore 54890, Pakistan;Department of Mechanical and Construction Engineering, Northumbria University, Newcastle upon Tyne NE7 7YT, UK;Institute of Energy & Environmental Engineering, University of Punjab, Lahore 54590, Pakistan;School of Engineering and Applied Science, Mechanical Engineering and Design, Aston University, Birmingham B4 7ET, UK;School of Mechanical Engineering, Wuxi 214024, China;School of Professional Education & Executive Development, The Hong Kong Polytechnic University, Kowloon, Hong Kong;

关键词: vapor compression cycle;    organic Rankine cycle;    waste heat recovery;    COP;    exergy efficiency;    thermal efficiency;   

DOI  :  10.3390/su132111592

来源: DOAJ

【 摘 要 】

This paper presents the performance assessment and working fluid selection for a novel integrated vapor compression cycle-organic Rankine cycle system (i-VCC-ORC), which recovers ultra-low-temperature waste heat rejected (50 °C) by the condenser of a vapor compression cycle (VCC). The analyses are carried out for a vapor compression cycle of a refrigeration capacity (heat input) of 35kW along with the component sizing of the organic Rankine cycle (ORC). The effects of the operational parameters on integrated system performance were investigated. The integrated system performance is estimated in terms of net COP, cycle thermal efficiency and exergy efficiency by completely utilizing and recovering the heat rejected by the condenser of the VCC system. R600a-R141b with COP_net (3.54) and ORC thermal efficiency (3.05%) is found to be the most suitable VCC-ORC working fluid pair. The integration of the vapor compression refrigeration cycle with the organic Rankine cycle increases the COP of the system by 12.5% as compared to the standalone COP of the vapor compression system. Moreover, the sensitivity analysis results show that there exists an optimum operating condition that maximizes the thermal performance of the integrated system.

【 授权许可】

Unknown