Ejector design method for vapor compression refrigeration circulating system

Abstract

The invention relates to an ejector design method for a vapor compression refrigeration circulating system. The method comprises the following steps of combining analysis and calculation of an ejector by an RKS (Redlich-Kwong-Soave) state equation, two-phase flow sound velocity formula and a classic thermodynamic method, calculating physical property parameters of refrigerant in various state points of the circulating system by the RKS equation, calculating sound velocity of two-phase flow in the ejector by the sound velocity formula, and calculating final state parameters of the ejector in adiabatic expansion process and compression process by the classic thermodynamic method, and determining the dimensions of various parts of the ejector, so as to complete the partial structure parameters of a nozzle, a mixing chamber, a diffuser and the like of the ejector under the conditions of different refrigerants, different working conditions and different refrigerating capacities. Through inputting the conditions of refrigerant types, different working conditions, different refrigerating capacities and the like, the structure parameters of the ejector and the physical property parameters of the refrigerant can be calculated fast, and the design efficiency and correctness of the calculation are improved greatly.

Description

technical field [0001] The invention relates to a method for designing an ejector, in particular to a method for designing an ejector in a vapor compression refrigeration cycle system. Background technique [0002] Since the beginning of the 21st century, with the development of the economy, energy consumption has increased day by day, and energy conservation and emission reduction has become a major issue worldwide. The vapor compression / jet refrigeration system introduces an ejector with simple structure, low cost and no moving parts into the vapor compression refrigeration system, which plays the dual role of recovering throttling loss and increasing the refrigerant pressure at the inlet of the compressor, so that the refrigeration compression in the system The suction pressure of the machine is higher than the evaporation pressure, which improves the refrigeration coefficient and reduces the throttling expansion loss. [0003] In the vapor compression / jet refrigeration ...

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the problem of complicated ejector design in the vapor compression / jet refrigeration cycle system, and proposes a design method for the ejector in the vapor compression refrigeration cycle system. The calculation formula and the analysis and calculation of the ejector by the classical thermodynamic method are combined, the physical parameters of the refrigerant at each state point of the circulation system are calculated by using the RKS equation, the sound velocity of the two-phase flow in the ejector is calculated by the sound velocity formula, and the classical thermodynamic method is used to calculate The final state parameters of the adiabatic expansion process and compression process in the ejector, determine the size of each part of the ejector, and complete the nozzle, mixing chamber, diffuser and other parts of the ejector under different refrigerants, different working conditions and different cooling capacity conditions Structural parameters

Images