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The high-temperature refrigerant in the display cooler
author: supermarket refrigerated showcase category: walk-in display coolers Views: 568Time: 2016-08-22
the high-temperature refrigerant in the display cooler
The safety level Al has a life span of 1 to 4 years in dog air. It is a transitional substitute. The allowable time limit is 2020 and production will be stopped in 2030. R123 has a relative mass molecular weight of 153 and a standard boiling point of 27,6°C. Because of its thermal properties are very close to Rll, and its environmental hazard is small, it is considered a suitable substitute for Rll. In the existing chillers, the emission of R123 is very low and the COP is high. Although the ODP is greater than zero, the overall impact on the environment is small, so it may continue to be used for a long time.
display cooler R404A and R507
, the alternatives of mixed refrigerant R502, is an azeotropic mixture of R22 and R115 with a mass composition of 48.8:51.2. It is used in the refrigeration system of frozen food display cabinets in supermarkets, but the ozone destruction index and the greenhouse effect index are relatively high, which is a prohibited substance. The current alternatives are R404A and R507. R404A is a ternary near-azeotropic mixed refrigerant R125/143a/Y134a, 44/52/4), ODP=0, GWP=3900, safety grade Al, standard boiling point-46.5℃, phase change slip temperature 0.5℃. Its cycle characteristics are similar to that of R502, and the cooling capacity and COP of the two are also similar. It can be used directly on the original R502 device. R404A is suitable for mid-overflow or low-temperature refrigeration devices. It is compatible with polyol ester (POE) and has been used in display coolers, display cabinets, low-temperature combination cold storage doors, ice making and transportation refrigeration devices. Its phase change slip temperature is small, so it can be used in flooded evaporators. R507 is an azeotropic mixed refrigerant (R125/143a, 50/50), with a standard boiling point of -52.5°C, ODP=0, GWP=3985, safety class Al, and heat transfer performance better than R502. The GWP of R404A and R507 is quite high, which is its shortcoming.
low temperature refrigerants R14 and R23R14 have ODP=0, GWP is greater than 4500, safety level Al, standard boiling point -128.0℃, applicable temperature range is 140℃ to 110℃. Because the R14 molecule contains more fluorine atoms and no hydrogen atoms, it has good chemical stability and does not decompose when the temperature reaches 400°C. Used in low temperature chemical industry and low temperature research, as the low temperature part of cascade refrigeration device. The standard temperature of R23 is -82.1°C, and the critical temperature is 25.9°C. It is mainly used in cascade refrigeration devices. It is a binary cascade system (R22+R23) composed of R22 and the cooling temperature is 80°C; containing R23 fourElement cascade system (R22+R23+Rl4+R50), the display cooler can reach a refrigeration temperature of 170℃.
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