A water-sealed small ammonia refrigeration system

Abstract

The invention discloses a water-sealing type small ammonia refrigeration system. The ammonia refrigeration system comprises a closed metal container, a small ammonia refrigeration unit, a first heat exchanger and a second heat exchanger, wherein the small ammonia refrigeration unit is composed of a compressor, a condenser, a throttling element and an evaporator for cooling secondary refrigerants, the first heat exchanger is used for heat exchange of the condenser and provided with a fan, and the second heat exchanger is used for lowering the temperature of the environment. Pure water is poured into the metal container. The small ammonia refrigeration unit is immersed into the pure water completely. A secondary refrigerant inlet of the first heat exchanger is connected with a secondary refrigerant outlet of the condenser. A secondary refrigerant outlet of the first heat exchanger is connected with a secondary refrigerant inlet of the condenser. A secondary refrigerant outlet of the second heat exchanger is connected with a secondary refrigerant inlet of the evaporator. A secondary refrigerant outlet of the evaporator is connected with a secondary refrigerant inlet of the second heat exchanger through a miniature secondary refrigerant pump. According to the refrigeration system, the whole ammonia refrigeration unit is immersed in the pure water, if the refrigeration unit leaks the refrigerants, the ammonia refrigerants can be absorbed by the water completely, it can be ensured that the refrigerants are not leaked to the outside, and the use safety of the ammonia refrigerants can be ensured.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a water-sealed small ammonia refrigeration system. Background technique [0002] In recent years, due to environmental problems such as the destruction of the atmospheric ozone layer by freon refrigerants and the greenhouse effect, a consensus has been reached in the world to completely ban CFCs and gradually limit the use of HCFCs refrigerants. Ammonia (R717) has been used as a refrigerant for 120 years. Its ozone layer depletion potential (ODP) is zero, its global warming potential (GWP) is also zero, and its standard boiling temperature is low (-33.3°C). The pressure in the evaporator and the evaporator is moderate, the cooling capacity per unit volume is large, and its thermal conductivity is large, the latent heat of evaporation is also large, the throttling loss is small, it can be dissolved in water, and it is easy to be found when there is air leakage. Refrigeratio...

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Problems solved by technology

In addition, ammonia will strongly corrode copper, zinc and their alloys (except high-tin phosphor bronze) when exposed to water. The pipelines, heat exchangers, and components that may come into contact with ammonia, including instruments, cannot be used with copper and zinc. and its alloy material manufacturing

Affected by ammonia odor, toxicity, flammability and other factors, ammonia cannot enter the civil and commercial fields, so its application is limited

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