Thermodynamic analysis of hybrid two-stage CO2 mechanical compression–ejector cooling cycle

喷油器 气体压缩机 制冷 热力学 蒸发器 火用 蒸汽压缩制冷 冷却能力 材料科学 可用能 跨临界循环 压缩(物理) 过冷 机械工程 核工程 机械 制冷剂 工程类 物理
作者
Volodymyr Ierin,Guangming Chen,Xinyue Hao,Oleksii Volovyk
出处
期刊:International Journal of Air-Conditioning and Refrigeration [World Scientific]
卷期号:31 (1)
标识
DOI:10.1007/s44189-023-00033-9
摘要

Abstract In the present study, the main results of thermodynamic analysis of the hybrid two-stage carbon dioxide (CO 2 ) transcritical mechanical compression–ejector cooling cycle using R245ca are provided. In the proposed cycle, an increase in the energy efficiency of a mechanical compression refrigeration machine (MCRM) is provided by additional supercooling of CO 2 after the gas cooler due to the use of cold obtained in an ejector cooling machine (ECM). The ECM uses part of the superheated vapor heat after the high-pressure compressor and the intermediate pressure heat after the low-pressure compressor. This solution provides intermediate cooling of CO 2 vapor without using an external cooling medium. The proposed method of computation makes it possible to determine the optimal parameters of the hybrid cooling cycle for the design conditions, ensuring the maximum possible MCRM efficiency. At the same time, the method considers the need to determine the optimal gas cooler pressure – a parameter that has a significant impact on efficiency growth. The effect of the intermediate pressure is extremely insignificant and is defined as the geometric mean value of the product of the gas cooler and evaporator pressures. The results show an increase in efficiency of the two-stage CO 2 MCRM by up to 31.6% at high temperatures of the environment. In addition, as a result of the exergy analysis, components have been identified, the improvement of which can lead to an additional increase in the efficiency of the entire system. As follows from the data obtained, the greatest attention should be paid to improving the ejector and reducing throttle losses in the CO 2 cycle.

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