Filippov

pp. 339–349

pp.60-69

Nowadays various methods of capacity regulation are or may be applied to screw compressors (SC). This paper presents research results of two methods: changing rotation frequency of the driving engine’s shaft and restriction of air in the suction passage. Comparative analysis of the research results allows to select the most suitable method for any particular case. Exergy efficiency coefficient was chosen as an economical operation criterion; this coefficient allows to estimate the degree of thermodynamic perfection of the screw compressor quantitively, when using various regulation methods.

Nowadays there is no method reliable enough to calculate the set of important screw oil-filled compressor parameters analitically, in particular, parameters of inner compression and injection. The results of the survey, included in the article, have allowed creating a mathematical model of different processes, taking place in screw oil-filled compressor, and developing the methods for the calculating of inner compression and injection parameters. The comparative analysis of theoretical and experimental results showed good correlation between each other, that means this method can be recommended for the forecasting of the compressor working mode and calculating the basic parameters of this mode.