Combined type refrigeration system and method based on coupling between direct cycle and reverse cycle

Abstract

The invention discloses a combined type refrigeration system and method based on coupling between a direct cycle and a reverse cycle. According to the combined type refrigeration system and method based on coupling between the direct cycle and the reverse cycle, medium-and-low-temperature waste heat or solar energy or the like serves as a driving heat source. The combined type refrigeration system based on coupling between the direct cycle and the reverse cycle comprises three subcycles, wherein the subcycles comprise an acting subcycle, an absorption refrigeration subcycle and a compression refrigeration subcycle, the higher-temperature portion of the medium-and-low-temperature heat source is used for driving the acting subcycle to do work, the lower-temperature waste heat of the medium-and-low-temperature heat source is used for driving the absorption refrigeration subcycle to carry out refrigeration, meanwhile, discharged heat of the acting subcycle is recycled by the absorption refrigeration subcycle, and the work done by the acting subcycle drives the compression refrigeration subcycle to enable the work to be converted into cold energy to be output. Energy input of the whole system comprises the medium-and-low-temperature heat source, and product output of the whole system comprises the cold energy. Compared with an independent absorption refrigeration system, heat efficiency and COP of the combined type refrigeration system based on coupling between the direct cycle and the reverse cycle are greatly improved.

Description

technical field [0001] The invention relates to the technical field of medium and low temperature heat source refrigeration, in particular to an absorption-compression composite refrigeration system and method based on forward and reverse cycle coupling. Background technique [0002] Ammonia water absorption refrigeration technology is a refrigeration technology that can be driven by low-temperature waste heat resources or low-temperature renewable energy such as solar energy and geothermal energy. in other chemical processes. Low-temperature residual heat drives the generation process and rectification process to separate the concentrated solution into high-purity ammonia vapor and low-concentration dilute ammonia solution. The ammonia vapor is condensed into liquid ammonia in the condenser, and the liquid ammonia is subcooled, throttled and depressurized. It enters the evaporator for evaporation and refrigeration, and the evaporated ammonia vapor enters the absorber to be...

AI Technical Summary

Problems solved by technology

[0003] The ammonia water absorption refrigeration cycle can use a lower temperature heat source, but when the heat source temperature is high, the COP of the absorption refrigeration cycle alone cannot be greatly improved. The main reason is that the temperature of the circulating working medium cannot increase with the temperature of the heat source. And rise, generally not more than 200 ℃

When the temperature of the heat source rises, there will be a large temperature difference in the energy transfer process, resulting in a large irreversible loss.

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