Analysis of a novel combined power and ejector-refrigeration cycle. (15th January 2016)

• Record Type: Journal Article
• Authors: Yang, Xingyang; Zheng, Nan; Zhao, Li; Deng, Shuai; Li, Hailong; Yu, Zhixin
• Is Part Of: Energy conversion and management. Volume 108(2016)
• Page Start: 266
• Page End: 274
• Publication Date: 2016-01-15
• Subjects: Combined power and refrigeration cycle -- Organic Rankine cycle -- Ejector-refrigeration -- Zeotropic mixture; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.11.019
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A new combined power and ejector-refrigeration cycle is proposed. A calculation method of the combined cycle with zeotropic mixtures is developed. The effects of fluid compositions and working conditions are analyzed. Abstract: A novel combined power and ejector-refrigeration cycle using zeotropic mixture is proposed. In the combined cycle, the turbine exhaust from the organic Rankine cycle entrains the vapor from the ejector-refrigeration cycle. And the zeotropic mixture is divided into the power cycle and the ejector-refrigeration cycle through a vapor–liquid separator. And these two flows have different composition. The cycle performance with different fluid composition is evaluated and it is compared with a conventional combined cycle. It is found that the cycle exergy achieves a maximum value of 10.29% with mixture isobutane/pentane (40%/60%), and the thermal efficiency gets a maximum value of 10.77% with mixture isobutane/pentane (70%/30%). The temperature glide in the evaporator achieves a maximum value of 15.09 K with mixture isobutane/pentane (80%/20%). The parametric analysis shows that the cycle performs better in lower condenser temperature. Though the refrigeration cycle achieves lower evaporating temperature in higher generating temperature, the power output is reduced.