Operation of a two-chamber refrigeration compressor with refrigerants with a high adiabatic coefficient
DOI: 10.17586/1606-4313-2026-25-1-25-31
UDC 621.5.041
Busarov Sergey S., Sinitsyn Nikita G.
Keywords: low-speed compressor, two-chamber machine, two-chamber machine refrigerant, R23 refrigerant, R717 refrigerant, mathematical model, coefficient of performance.
UDC 621.5.041
Operation of a two-chamber refrigeration compressor with refrigerants with a high adiabatic coefficient
For citation: Busarov S.S., Sinitsin N.G. Operation of a two-chamber refrigeration compressor with refrigerants with a high adiabatic coefficient. Journal of International Academy of Refrigeration. 2026. no 1. P. 25-31. DOI: 10.17586/1606-4313-2026-25-1-25-31. (in Russian)
Abstract
This paper examines the compression of refrigerants with highly adiabatic indices. These working fluids are characterized by a rapid temperature rise during compression. Currently, the operation of such refrigeration machines involves the use of multi-stage compressors containing several stages with varying cylinder sizes and intermediate heat exchangers. A promising direction for improving refrigeration machines is the replacement of two-stage compressors with low-speed single-stage units. This simplifies the refrigeration machine design at discharge temperatures close to those of two-stage machines. Improvement of low-speed refrigeration compressors can be achieved by using two-chamber machines in which the working fluid is alternately compressed in one chamber, followed by post-compression with intensive cooling in the second. This eliminates the need for cooling the working fluid between chambers. This design is significantly simpler than a multi-stage design and more efficient than a single-stage low-speed design. As an example of calculations using R23 and R717 refrigerants has shown, the use of a two-chamber low-speed design not only reduces the working fluid discharge temperature and increases productivity by at least fourfold, but also improves the energy efficiency of the machine (increasing the coefficient of performance). Furthermore, a potential is emerging for certain operating modes of two-chamber compressors, such as when the compression line enters the wet vapor region, which is a separate research topic.
Abstract
This paper examines the compression of refrigerants with highly adiabatic indices. These working fluids are characterized by a rapid temperature rise during compression. Currently, the operation of such refrigeration machines involves the use of multi-stage compressors containing several stages with varying cylinder sizes and intermediate heat exchangers. A promising direction for improving refrigeration machines is the replacement of two-stage compressors with low-speed single-stage units. This simplifies the refrigeration machine design at discharge temperatures close to those of two-stage machines. Improvement of low-speed refrigeration compressors can be achieved by using two-chamber machines in which the working fluid is alternately compressed in one chamber, followed by post-compression with intensive cooling in the second. This eliminates the need for cooling the working fluid between chambers. This design is significantly simpler than a multi-stage design and more efficient than a single-stage low-speed design. As an example of calculations using R23 and R717 refrigerants has shown, the use of a two-chamber low-speed design not only reduces the working fluid discharge temperature and increases productivity by at least fourfold, but also improves the energy efficiency of the machine (increasing the coefficient of performance). Furthermore, a potential is emerging for certain operating modes of two-chamber compressors, such as when the compression line enters the wet vapor region, which is a separate research topic.
Keywords: low-speed compressor, two-chamber machine, two-chamber machine refrigerant, R23 refrigerant, R717 refrigerant, mathematical model, coefficient of performance.
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