Simulation des refroidisseurs de liquide à vis en régime permanent.

The model presented includes sub-models for key components, such as a non-economized compressor, an economized compressor, a shell-and-tube condenser, an expansion valve, and a flooded evaporator. A sequential modular method and successive substitution methods were combined together to carry out the simulation of the chillers. It was found that the cooling capacity of a screw liquid chiller appears to be increased by adding the economizer, but only when the volumetric ratio of the first stage internal compression is greater than a certain value; the economized screw liquid chiller can gain a higher COP than that of the non-economized one.