Investigation on the Performance of the Pump-Free Double Heat Source Ejector Refrigeration System with R1234yf
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https://doi.org/10.1007/s11630-020-1386-z
Article ID: 1003-2169(2020)00-0000-00
Investigation on the Performance of the Pump-Free Double Heat Source Ejector Refrigeration System with R1234yf YU Meihong1, ZHAO Hongxia1*, WANG Xinli2, HAN Jitian1, LAI Yanhua1 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China 2. School of Control Science and Engineering, Shandong University, Jinan 250061, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: A pump is needed in an ejector refrigeration system, which makes the system high cost and complicated and hinders its application. A pump-free double heat source ejector refrigeration system using R1234yf as working fluid is proposed in which an injector driven by another heat source replaces the liquid circulating pump, making the system more affordable, simpler and more stable. The effect of different operation conditions on entrainment ratios and the influence of different factors on system performance are analyzed on the basis of mass, momentum and energy conservation equations. The influence degree of each factor on system performance is investigated by the orthogonal test method. The condenser temperature has the largest effect on system performance. The pressure drop in the suction chamber of gas-liquid injector has the least impact on system performance. The COP can reach about 0.35 under a certain working condition. The system can be driven by two different temperature heat sources with no electricity needed, and it is a good choice for places with abundant heat resources or lack of electricity.
Keywords: ejector refrigeration system, injector, entrainment ratio, coefficient of performance (COP)
1. Introduction With the development of global industrialization, energy and environmental problems are becoming more and more prominent. In 2017, the industrial sector accounts for about 30.5% of Global Domestic Product [1]. The industrial sector has grown to be one of the top three energy consumptions, and the industrial waste heat accounts for 20% to 50% of industrial energy consumption [2]. If the waste heat can be used, it will have a major impact on world’s energy and climate. An ejector refrigeration system has attracted much attention, since it can utilize sustainable energy like solar energy and take advantage of low-grade waste heat from industrial processes so that the troubles connected with Received: Mar 01, 2020
AE: WANG Lin
CO2 emission and costs can be reduced. However, the ejector refrigeration system has not been widely used because of the low efficiency. To make ejector refrigeration system more attractive, several studies on improving the system efficiency have been carried out [3–5]. Ejector, as the major component, plays an important role in ejector refrigeration system. On the basis of reasonable assumptions, the mathematical model of the ejector was presented in Ref. [6], and it found that mixing chamber greatly impacts operation and
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