Double-temperature-heat-source injection-type refrigeration system

Abstract

The invention relates to a double-temperature-heat-source injection-type refrigeration system. The working temperature of a first generator is higher than that of a second generator; the steam outlet of the first generator is connected with the working fluid inlet of a first injector; the outlet of the first injector is connected with the refrigerant inlet of a condenser; the refrigerant outlet of the condenser is divided into three ways, one way is connected with the inlet of the first generator through a first working medium pump, another way is connected with the refrigerant inlet of an evaporator through a first throttling valve, and the third way is connected with the low-pressure inlet of a condensation evaporator through a second throttling valve; the low-pressure outlet of the condensation evaporator is connected with the driving fluid inlet of the first injector; the steam outlet of a second generator is connected with the working fluid inlet of a second injector; the outlet of the second injector is divided into two ways, one way is connected with the driving fluid inlet of the first injector, and another way is connected with the high-pressure inlet of the condensation evaporator; and the high-pressure outlet of the condensation evaporator is connected with the inlet of the second generator through a second working medium pump.

Description

technical field [0001] The present invention relates to a refrigeration cycle system, in particular to a dual-temperature heat source jet refrigeration system utilizing low-grade energy such as solar energy or waste heat. Background technique [0002] The ejector refrigeration cycle system uses water, ammonia, HF, HFC or HCFC as the refrigerant. The biggest difference between the ejector refrigeration cycle and the mechanical compression refrigeration cycle is that the compressor is replaced by an ejector, and the liquid from the condenser is heated by a low-temperature heat source. The high-pressure steam is generated from the gas, and the low-pressure steam from the evaporator is ejected by the ejector and compressed into a higher pressure steam, which creates conditions for the condensation of the gaseous working medium at a higher temperature. There are no other moving parts except the working medium circulating pump. Less operation and maintenance, less consumption of h...

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Problems solved by technology

[0002] The injection refrigeration cycle system uses water, ammonia, HF, HFC or HCFC as the refrigerant. The biggest difference between the injection refrigeration cycle and the mechanical compression refrigeration cycle is that the compressor is replaced by an ejector, and the liquid from the condenser is heated by a low-temperature heat source. The medium produces high-pressure steam, and the low-pressure steam from the evaporator is injected by the ejector and compressed into higher-pressure steam, creating conditions for the condensation of the gaseous working medium at a higher temperature. There are no other moving parts except the working medium circulation pump, and the circulation Less operation and maintenance, less consumption of high-grade mechanical energy, especially for freon-type working fluids, only need 60 ℃ low-temperature heat source to drive cycle work, with unique low-grade low-temperature energy such as solar energy, geothermal heat, factory waste heat, waste heat, etc. The advantage is that it is an ideal refrigeration method that uses low-enthalpy energy to obtain refrigeration effects. However, the refrigeration temperature that can be obtained by the traditional jet refrigeration cycle is relatively high, usually above 0°C. Due to the limitation of the ejector compression ratio, the condenser cannot Obtaining a condensing agent with too much pressure makes the temperature of the refrigerant after passing through the condenser relatively high. It is almost impossible to obtain a refrigeration temperature of -10°C through the evaporator, which limits the application of traditional jet refrigerators.

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