Abstract
The present paper reports the performance of a popular refrigerant R32 (Difluoromethane, CF2H2) experiencing the two phase injection process. Two phase injection process may lower the discharge temperature of a multistage compressor. In order to investigate the role and impact of two-phase injection on a compressor, a Scroll compressor is selected because scroll compressor has high tolerance for liquid refrigerant. A reputed compressor is chosen where all the operating conditions and specifications are available in public domain. The modelling and analysis of refrigeration system is carried out using a simple MATLAB code. Around 200 iterations were performed for four different condensing and evaporating temperatures. The maximum reduction in discharge temperature is found to be 44°C when compared to R410A used in the same system.
Highlights
Since the first vapor compression refrigeration system was made by Jacob Parking in 1834, a large number of chemical substances have been tried as working fluid like ammonia, methyl chloride, carbon dioxide etc. [1]
Fifty values of coefficient of performance (COP) are obtained by the MATLAB code for 50 different intermediate pressure ratios
The modelling and analysis of refrigeration systems with two-phase injection is carried out using a MATLAB code
Summary
Since the first vapor compression refrigeration system was made by Jacob Parking in 1834, a large number of chemical substances have been tried as working fluid like ammonia, methyl chloride, carbon dioxide etc. [1]. R11 and R12 were the most widely used refrigerants [1]. When HVAC industry started to grow at a faster rate, the production of these refrigerants exceeded many million tons, the high production of these refrigerants was seen as a cause of concern as these refrigerants were found responsible for ozone depletion and global warming [2]. Due to environmental concerns the production of R11 and R12 has been stopped. This led to their replacement with R22. As R22 is responsible for ozone depletion many R22 alternatives were introduced into the market such as R410A, R407C etc. Which are non-ozone depleting refrigerants but have very high global warming potential (GWP).
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