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A study of working fluids for heat driven ejector refrigeration using lumped parameter models |
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| Affiliation: | 1. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shangxi 030024, China;2. Australasian Joint Research Centre for Building Information Modelling, School of Built Environment, Curtin University, Perth, WA 6845, Australia;3. Department of Housing and Interior Design, Kyung Hee University, Seoul, South Korea;4. Department of Mathematics and Statistics, Curtin University, Perth, WA 6845, Australia;1. Escola Politécnica Superior, Universidade da Coruña, Spain;2. Escuela de Ingenierías Industriales, Universidad de Valladolid, Spain;1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, No. 92 Weijin Road, 300072 Tianjin, PR China;2. Malardalen University, SE-721 23 Vasteras, Sweden;3. University of Stavanger, 4036 Stavanger, Norway;1. RU Energetic and Environment – National Engineering School of Tunis (ENIT), Tunis El Manar University, Tunisia;2. Mechanical Engineering Department, JUST, Irbid, Jordan |
| Abstract: | This paper studies the influence of working fluids over the performance of heat driven ejector refrigeration systems performance by using a lumped parameter model. The model used has been selected after a comparison of different models with a set of experimental data available in the literature. The effect of generator, evaporator and condenser temperature over the entrainment ratio and the COP has been investigated for different working fluids in the typical operating conditions of low grade energy sources. The results show a growth in performance (the entrainment ratio and the COP) with a rise in the generator and evaporator temperature and a decrease in the condenser temperature. The working fluids have a great impact on the ejector performance and each refrigerant has its own range of operating conditions. R134a is found to be suitable for low generator temperature (70–100 °C), whereas the hydrocarbons R600 is suitable for medium generator temperatures (100–130 °C) and R601 for high generator temperatures (130–180 °C). |
| Keywords: | Ejector Working fluids Entrainment ratio Ejector refrigeration Ejector efficiencies Ejecteur Fluides actifs COP Taux d'entrainement Système frigorifique à éjecteur Efficacités d'éjecteur |
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