ON DEFINING THE EFFICIENCY OF A SCROLL COMPRESSOR

BACKGROUND: Nowadays, scroll compressors are often used in refrigeration technology. They have a high volumetric efficiency, low noise, high balance and a number of other advantages. There is not enough information in the public domain describing the calculation of the efficiency of scroll compressors, whereas this design stage is one of the main ones.

AIM: Obtaining mathematical relations that allow calculating the indicator and isentropic efficiency of a scroll compressor.

METHODS: In determining the calculated coefficients, methods of mathematical analysis and mathematical statistics were used, namely, the generalization of technical data provided by manufacturers of serial scroll compressors in the public domain, and approximation by the least-squares deviation method.

RESULTS: Mathematical relations have been obtained for calculating the indicator and isentropic efficiency of scroll compressors in the form of cubic polynomial dependences on the evaporation temperature and condensing temperature. The coefficients of the polynomials for refrigerants R134a, R32, R404A, R407C, R410A are calculated.

CONCLUSION: The paper shows a method for solving the problem of calculating the efficiency of a scroll compressor, its power consumption and discharge temperature. This work may be useful in the production of newly created scroll compressors as an initial approximation.