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Open AccessArticle

Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement

Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wroclaw 50-370, Poland
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Energies 2018, 11(8), 2136; https://doi.org/10.3390/en11082136
Received: 25 July 2018 / Revised: 9 August 2018 / Accepted: 13 August 2018 / Published: 16 August 2018
Theoretical investigations of the ejector refrigeration system using hydrofluoroolefins (HFOs) and hydrochlorofluoroolefin (HCFO) refrigerants are presented and discussed. A comparative study for eight olefins and R134a as the reference fluid was made on the basis of a one-dimensional model. To facilitate and extend the possibility of comparing our results, three different levels of evaporation and condensation temperature were adopted. The generator temperature for each refrigerant was changed in the range from 60 °C to the critical temperature for a given substance. The performed analysis shown that hydrofluoroolefins obtain a high efficiency of the ejector system at low primary vapor temperatures. For the three analyzed sets of evaporation and condensation temperatures (te and tc equal to 0 °C/25 °C, 6 °C/30 °C, and 9 °C/40 °C) the maximum Coefficient of Performance (COP) was 0.35, 0.365, and 0.22, respectively. The best performance was received for HFO-1243zf and HFO-1234ze(E). However, they do not allow operation in a wide range of generator temperatures, and, therefore, it is necessary to correctly select and control the operating parameters of the ejector. View Full-Text
Keywords: ejector; hydrofluoolefins; entrainment ratio; HFO-1234yf; HFO-R1234ze(E); HFO-1243zf ejector; hydrofluoolefins; entrainment ratio; HFO-1234yf; HFO-R1234ze(E); HFO-1243zf
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Gil, B.; Kasperski, J. Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement. Energies 2018, 11, 2136.

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