A simple program to design a multi-stage jet-pump for refrigeration cycles

摘要

A PC quickbasic program was developed in the aim to design a jet-pump device for a water refrigeration cycle. At given conditions of generator, evaporator and condenser, with a defined cooling power, the design is automatic, yielding to a configuration which allows the maximum pressure gain the system can achieve. The physical model used is the classical one-dimensional with constant-area mixing. A second stage is used when the single one cannot achieve the necessary compressing ratio, due to Boundary condition. An annular primary flux is used for the second stage so a compact structure is Obtained leading to an efficient utilization of kinetic energy of the secondary stream.