Two-stage compression refrigeration system with expansion and pressurization

Abstract

The invention discloses a two-stage compression refrigeration system with expansion and pressurization, and aims to provide a system capable of reducing the loss in the throttling process and improving the system energy efficiency. An exhaust port of a functional compressor is connected with an inlet of a condenser, and an outlet of the condenser is connected with the inlet end of an expansion machine; the outlet end of the expansion machine is connected with the inlet end of a throttling element; the outlet end of the throttling element is connected with an inlet of an evaporator, and an outlet of the evaporator is connected with a gas sucking port of a pressurization compressor; and an exhaust port of the pressurization compressor is connected with a gas sucking port of the functional compressor, and the expansion machine drives the pressurization compressor. According to the refrigeration system, the expansion machine expands to do work so as to drive the pressurization compressor to run, the pressurization compressor sucks in low-pressure steam work media and compresses the low-pressure steam work media to be in medium pressure, the first-stage compression is completed, the loss in the throttling process is reduced, the entropy increase of the refrigeration cycle is reduced, and the energy efficiency ratio of the circulation system is increased. Besides, the structure is simple, and cost is low.

Description

Technical field [0001] The present invention relates to the technical field of refrigeration, and more specifically, to a two-stage compression refrigeration system with expansion and boost. Background technique [0002] When lower temperature refrigeration is required, single-stage compression or two-stage compression refrigeration cycles are usually used. This temperature requirement has the following shortcomings for the application of single-stage compression refrigeration cycle: the compressor works for a long time between a large working pressure difference, which consumes a lot of power and wears a lot of the compressor, resulting in the performance of the single-stage compression refrigeration cycle The coefficient is relatively low and the maintenance cost is high. This kind of temperature demand has the following shortcomings for the two-stage compression refrigeration cycle: the refrigeration system has a complex structure and high investment costs, so it is very nece...

AI Technical Summary

Problems solved by technology

This temperature requirement has the following disadvantages for the application of single-stage compression refrigeration cycle: the compressor works for a long time between a large working pressure difference, which consumes a lot of power and wears the compressor greatly, resulting in the performance of the single-stage compression refrigeration cycle. The coefficient is relatively low and the maintenance cost is high

This temperature requirement has the following disadvantages for the two-stage compression refrigeration cycle: the structure of the refrigeration system is complex and the input cost is high, so it is very necessary to optimize the two-stage compression refrigeration cycle system

Both the single-stage compression refrigeration system and the two-stage compression refrigeration system have the following disadvantages: the throttling process of the throttling and step-down element has a large loss, resulting in a large increase in the entropy of the entire refrigeration cycle and a low performance coefficient of the system.

Images