Modified CO2-based combined cooling and power cycle with multi-mode and adjustable ability. (15th December 2020)

• Record Type: Journal Article
• Authors: Zhang, Yonghao; Shu, Gequn; Tian, Hua; Shi, Lingfeng; Sun, Xiaocun
• Is Part Of: Energy conversion and management. Volume 226(2020)
• Publication Date: 2020-12-15
• Subjects: Combined cooling and power cycle -- Multi-mode -- Adjustable -- CO2 -- Engine waste heat recovery; 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.2020.113485
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Two modified combined refrigeration and power cycles with multi-mode operation are proposed. The proposed systems can realize diversified power and refrigeration allocation and supply through mode transformation. The proposed systems can achieve considerable potential of energy saving. The proposed systems can replace original refrigerator and related small-scale engine. Abstract: To fulfill the diversified demand of power and cooling, the multi-mode combined cooling and power cycle based on CO2 is studied in this research, which can realize full power mode, simultaneous power and refrigeration mode and full refrigeration mode. A two-phase ejector is introduced to ameliorate the configurations of conventional combined cycles. A refrigerated truck is selected as the research objective and two refrigeration conditions are considered. Through the energy and exergy analyses, great improvement in performance and considerable potential in diversified energy supply can achieve by the modified systems. Therein, the modified system with single-stage compression achieves 4.9% improvement of power output and 21.7% improvement of refrigeration output versus the baseline system under refrigeration condition. It can provide extra 15.1 kW power for the objective refrigerated truck after satisfying the refrigeration demand. Besides, the adjustability performance is also discussed in this study, which reveals that the modified system with single-stage compression also possesses the best adjustability performance for its highest cooling to power ratio and the convenient mode transforming and controlling.