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Supermarket refrigerated showcase refrigeration system air release operation method
author: supermarket refrigerated showcase category: walk-in display coolers Views: 522Time: 2016-08-22
supermarket refrigerated showcase refrigeration system air release operation method
Possibility of air entering the system
(1) The refrigeration system was not completely cleared of air before it was put into production or after the overhaul. Pass), so the air exists in the supermarket refrigerated showcase refrigeration system.
(2) During routine maintenance, local pipelines and equipment are put into operation without vacuuming.
(3) Air is brought in when the system is filled with ammonia, fluorine, and oil.
(4) When the low-pressure system is working under negative pressure, air is blown in through the imprecise place.
Harm of air entering the system
(1) causes the condensing pressure to rise. In a condenser with air, air occupies a certain volume and has a certain pressure, and the refrigerant also has a certain pressure. According to Dalton's law: In a container (equipment), the total gas pressure is equal to the sum of the partial pressures of the gases. So in the condenser, the total pressure is the sum of air and refrigerant pressure. The more air in the condenser, the greater its partial pressure, and the total pressure of the condenser naturally rises.
(2) Due to the presence of air, the gas layer formed on the heat transfer surface of the supermarket refrigerated showcase has the effect of increasing the thermal resistance, thereby reducing the heat transfer efficiency of the condenser. At the same time, as air enters the system, the water content of the system increases, which will corrode pipelines and equipment.
(3) Due to the presence of air, the increase in condensing pressure will result in a decrease in the cold production of the refrigerator and an increase in power consumption.
(4) If there is air, accidents are prone to accidents when the exhaust temperature is high and oil vapor is encountered.
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