Analysis of the effect of cylinder wall thickness on the characteristics of a single-stage long-stroke refrigerating compressor

The article examines thermodynamic characteristics of a single-stage, low-speed, long-stroke piston refrigeration compressor with a linear drive. Theoretical studies are conducted using a method for calculating the actual operating process of a single stage of such a compressor, considering account transient heat conduction processes under mixed boundary conditions. The coefficient of performance and the discharge temperature of the single-stage, low-speed, long-stroke piston compressor with a linear drive are considered as integral parameters. Condensation and boiling temperatures, the main dimensions and parameters of the stage, and the heat flux density on the outer cylinder surface are considered as independent parameters. A comparative analysis of the energy efficiency of the operating process and the temperature regime of the stage in question is performed at a boiling temperature of 203 K in a condensing temperature range of 273 K to 343 K and at various heat flux densities on the outer cylinder surface. The relations between heat flux density, ammonia boiling and condensation temperatures, and the integral characteristics of a single-stage, low-speed, long-stroke piston compressor with a linear drive, as well as the temperature field distribution across the cylinder bore and the cylinder wall thickness, was studied. The research demonstrates that a rational combination of the external cooling mode of a cylinder of a single-stage low-speed reciprocating long-stroke compressor with a linear drive and its wall thickness makes it possible to ensure a cooling coefficient value higher than that of high-speed two-stage reciprocating compressors.

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