Abstract
The paper presented a mathematical assessment of selected refrigerants for the ejector cooling purpose. R1234ze(e) and R1234yf are the well-known refrigerants of hydrofluoroolefins (HFOs), the fourth-generation halocarbon refrigerants. Nature working fluids, R600a and R290, and third-generation refrigerant of halocarbon (hydrofluorocarbon, HFC), R32 and R152a, were selected in the assessment. A detail mathematical model of the ejector, as well as other components of the cycle, was built. The results showed that the coefficient of performance (COP) of R1234ze(e) was significantly higher than R600a at the same operating conditions. R1234yf’s performance was compatible with R290, and both were about 5% less than the previous two. The results also indicated that R152a offered the best performance among the selected refrigerants, but due to the high value of global warming potential, it did not fulfill the requirements of the current European refrigerant regulations. On the other hand, R1234ze(e) was the most suitable working fluid for the ejector cooling technology, thanks to its overall performance.
Highlights
The most attractive point of the ejector cooling technologies is that they are driven mainly by heat energy sources
In a study on a solar-driven ejector cooling system, Guo et al [1] claimed that the system could save up to 80% electric energy compared to traditional compressor refrigeration
The six selected working fluids were assessed based on three essential criteria: In this paper, the six selected working fluids were assessed based on three essential criteria: the the coefficient of performance, the working pressure, and the sensitivity of optimal ejector geometry coefficient of performance, the working pressure, and the sensitivity of optimal ejector geometry with with working conditions
Summary
The most attractive point of the ejector cooling technologies is that they are driven mainly by heat energy sources. They have compatible working pressures to common HFCs and good thermodynamic properties The fact that they have just recently been studied for the last ten years, and there are only several studies on ERS using these refrigerants, which used the drop-in replacement method, as mentioned before, having a reasonable approach to the topic “HFOs for ERS” can assure a favorable performance and stability system. HFOs seem to be suitable replacements because they have zero ODP and very low GWP T , ECT the required working pressure in a range of the generator temperature
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