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Commercial refrigeration The impact of refrigeration on the environment
commercial refrigeration The impact of refrigeration on the environment
commercial refrigeration starts from the protection of the environment. The NH3/C02 cascade refrigeration system composed of NH3 and COz was put into operation in the 1990s. It has been widely used in commercial refrigeration, supermarket commercial refrigeration and other food freezing and cold storage fields. The NH3/C02 cascade refrigeration system has the following advantages than the ammonia single-stage compression or two-stage compression refrigeration system widely used in commercial refrigeration.
①C02, as a natural working fluid, is non-toxic, tasteless, non-flammable, and does not support combustion. As the low temperature grade adopts C02, it can avoid direct contact of ammonia with food and people, and reduce the risk of refrigeration system. In addition, if a major leakage event occurs, CO2 will only form dry ice, and the sublimation of dry ice into a gas will not cause harm, increasing the safety of system operation.
②The NH3/COZ cascade refrigeration system can significantly reduce the ammonia charge. The ammonia charge in the NHa/COz cascade refrigeration system is about 1/8 of the ammonia two-stage compression refrigeration system. The cooling capacity per unit volume of
③C02 refrigerant is large, about 8 times that of NH3, and the volume flow of low-temperature refrigerant is greatly reduced.
④NH3/COZ cascade refrigeration system has significant energy saving effect. Judging from the operation of commercial refrigeration, when the refrigeration temperature is 31.7℃, the NH3/C02 cascade refrigeration system can save energy by 25% compared with the ammonia single-stage refrigeration system and 7% compared with the ammonia two-stage compression refrigeration system. The lower the temperature, the energy saving effect The more obvious.
is a cascade refrigeration cycle composed of two single-stage systems. Due to the limitation of the compressor pressure ratio, it can only reach a low temperature of about 80°C. If a cascade system composed of a single-stage system and a two-stage system is used, a low temperature of about 110°C can be produced. In order to get a lower temperature, a ternary cascade cycle (ie a cascade system composed of three different refrigerants) can be used. It can be seen that the cycle selection of a commercial refrigeration cascade system mainly depends on the low temperature requirements that need to be met, and if it is properly matched, the economy and reliability of the entire system can be improved.
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