Chumak I. Design and analysis of transient processes in refrigerating apparatus.

The theoretical basis has been developed for the investigation of on-off (nonlinear) action refrigerating systems, the linear part of which (heat-exchangers, cold chambers, oil coolers, circulation receivers, etc.) is defined by differential equations of the first, second and third orders. Theoretical investigations of the above systems have been carried out by the method of fitting. In this case we used only differential equations of refrigerating equipment under control. A graphical method is offered for finding parameters of self-excited oscillations in the process of control and optimal parameters of adjusting on-off controllers. Methods of fitting and producing mathematical models of refrigerating equipment by their experimental curves of acceleration have been improved.