Method for setting generating temperature of steam compression-enhanced ejector refrigeration system during designing based on 'exergy' efficiency calculation

Abstract

The invention discloses a method for setting the generating temperature of a steam compression-enhanced ejector refrigeration system during designing based on 'exergy' efficiency calculation so as to make the system designed 'exergy' efficiency be optimal. When the set generating temperature is raised, the temperature and mass of high-temperature and high-pressure steam cooled in a liquid storage tank in the cooling subprocedure can be increased, the 'exergy' value of heat wasted by the system is increased, and therefore the system designed 'exergy' efficiency is improved at first and then lowered, and a maximum value exists. The set generating temperature corresponding to the maximal system designed 'exergy' efficiency is defined as an optimal set generating temperature. When the optimal set generating temperature is within a temperature range allowed by the temperature of a heat source, the generating temperature should be set at the optimal set generating temperature. When the optimal set generating temperature is lower than the temperature allowed by the heat source, the generating temperature should be set at the lowest temperature allowed by the heat source. When the optimal set generating temperature is higher than the temperature allowed by the heat source, the generating temperature should be set at the highest temperature allowed by the heat source.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to the setting of the generated temperature during the design of a steam pressurized injection refrigeration system. Background technique [0002] Cooling energy consumption accounts for about 15% of the total global energy consumption. Reducing cooling energy consumption can effectively alleviate the increasingly severe energy and environmental problems. [0003] Traditional jet refrigeration system ( figure 1 ), consisting of generator 1, evaporator 2, condenser 3, ejector 4, liquid pump 5, throttle valve 6, etc. The ejector is the core component of the ejector refrigeration system and is used to replace the compressor in the traditional mechanical compression refrigeration system. In the ejector, the high-temperature and high-pressure working fluid from the generator pressurizes the low-temperature and low-pressure injection fluid from the evaporator to obtai...

AI Technical Summary

Problems solved by technology

In the prior art, there is no scheme that can guide the precise selection of the set generation temperature within a wide temperature range to ensure that the design "exergy" efficiency of the designed vapor booster injection refrigeration system is optimal

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