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Étude d'une compression refroidie par injection d'huile dans un compresseur scroll : application au remplacement du R-410A dans les groupes refroidisseurs d'eau

Abstract : Current global warming problem leads to more stringent environmental standards. Thus the HVAC field is affected by these standard changes, which requires the transition to a new generation of refrigerants with lower environmental impact. In this thesis, this aspect is studied in the case of water chillers using R-410A that is subject to substitution due to new standards. But solving this problem doesn’t stop at mere refrigerant change by another with lower GWP. It is necessary that improvement or maintain of cooling capacity and energy efficiency of the system accompanies this transition by fear of having a reverse effect because global energy consumption represents a greater effect on the environmental impact than refrigerant GWP.A review of literature and experimental tests carried out by replacing R-410A show that refrigerants used in the market and offered by manufacturers to replace R-410A don’t allow the desired improvements. Among these substituents, R-32 is the most used and seems promising, but it causes a decrease of COP and very high compressor discharge temperatures. Thus, the solution of cooled compression by injection of lubricating oil in the compressor is studied and modeled. The theoretical model shows that this solution helps cooling the compression and reduces compressor power consumption provided that injection is characterized by very fine drops of oil with controllable flowrate and oil temperature.To implement this solution, an oil atomization system is designed and tested, the results show that it is possible to create a spray of very fine droplets for injection pressures of the order of the difference between the high and low pressures of the water chiller. Cooled compression is then tested by connecting the oil atomization system to the water chiller. Reductions of compressor discharge temperature and of compressor power consumption are measured, but measured reductions are lower than the theoretical expected reductions. By integrating an increased droplet
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Submitted on : Tuesday, January 4, 2022 - 2:28:36 PM
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  • HAL Id : tel-03510245, version 1

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Rani Hanna. Étude d'une compression refroidie par injection d'huile dans un compresseur scroll : application au remplacement du R-410A dans les groupes refroidisseurs d'eau. Génie des procédés. Université Paris sciences et lettres, 2016. Français. ⟨NNT : 2016PSLEM035⟩. ⟨tel-03510245⟩

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