Mixed working substance containing N*O in auto-cascade circulatory system

Abstract

The invention discloses a mixed working substance containing N2O in an auto-cascade circulatory system. The working substance consists of 15-50% of a first group substance by mass fraction and a second group substance in balancing amount, wherein, the first group substance is N2O or a compound formed by N2O and one or more of ethane, trifluoromethane, hexafluoroethane, fluoromethane, carbon dioxide and ethylene. Compared with the prior working substance used for the auto-cascade circulatory system, the mixed working substance provided by the invention has the following advantages: the mixed working substance provided by the invention can effectively realize the refrigeration of a temperature range of 200-240K; the ozone depletion potential (ODP) of N2O (R744A) equals to zero, and the global warming potential (GWP) thereof is relatively low; and as N2O is a natural substance which can be easily obtained, and other refrigerants matched with N2O are reasonably priced, the use of the mixed refrigerant can reduce the cost for companies.

Description

technical field [0001] The invention relates to a multi-element mixed working medium refrigerant, in particular to a self-cascading circulation system suitable for 200-240K temperature zone containing N 2 O mixed working fluid. Background technique [0002] The minimum refrigeration temperature achieved by a single-stage vapor compression refrigeration cycle is generally 230K. When the condensing pressure is constant, if you want to achieve a lower evaporation temperature, the system pressure ratio will increase, the gas transmission coefficient will decrease, and the cooling capacity will decrease. The efficiency of the actual compressor decreases, the power consumption increases, the exhaust temperature increases, and the operating conditions deteriorate. In order to achieve a lower temperature, a multi-stage compression refrigeration cycle system and an outer cascade refrigeration cycle system can be used, but the multi-stage compression system and the outer cascade cycl...

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Problems solved by technology

[0002] The minimum refrigeration temperature achieved by a single-stage vapor compression refrigeration cycle is generally 230K. When the condensing pressure is constant, if you want to achieve a lower evaporation temperature, the system pressure ratio will increase, the gas transmission coefficient will decrease, and the cooling capacity will decrease. The efficiency of the actual compressor decreases, the power consumption increases, the exhaust temperature increases, and the operating conditions deteriorate

In order to achieve a lower temperature, a multi-stage compression refrigeration cycle system and an outer cascade refrigeration cycle system can be used, but the multi-stage compression system and the outer cascade cycle system require a special compressor, and the refrigeration system is complicated, with low efficiency and high cost , low reliability

Not yet involved in containing N 2 O(R744A) mixed working fluid reports for the above temperature range

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