Manual frost removal: The operator removes the frost directly on the surface of the evaporator by holding the removal tool. It is generally only applicable to the defrosting of wall tubes and top tubes of freezers in freezers. Freezer cold storage room is a long-term inventory of cold storage, the pipe at the top of the goods or in the immediate vicinity of the goods, if the use of hot air defrosting or electric defrosting, frost melting will not only make the items damp, but also stick the items into pieces, and, The recovery of the warehouse temperature will also damage the storage quality of foods. Therefore, it is not advisable to use the "melting" cream to defrost the pipes in the freezer and cold storage rooms. The characteristic of artificial frost removal is that the frost does not melt, and the evaporator can still work normally during the defrosting process. It basically does not affect the constant temperature of the warehouse, so it is most suitable for the defrosting of the tubes in the frozen storage room. However, during the defrosting, the personnel must enter the warehouse to operate, the working conditions are poor, and the heating and cooling capacity and labor costs of the personnel must be increased.
Artificial defrosting also has a balance between labor costs and operating costs. Due to the different types of goods stored in various refrigeration plants, the packaging situation is not the same, and the frosting speed of the pipes is very different. Therefore, the time interval for manual defrosting can only be determined according to their specific conditions. The scientific approach is to apply the frost layer. The thickness of the system adds a comprehensive analysis and comparison of the operating electricity fee and the defrosting labor fee, so as to determine a reasonable economic defrosting cycle. The specific analysis idea is that in a reasonable defrosting cycle, the cumulative amount of additional operating expenses caused by frost resistance is exactly equal to the labor cost for one defrosting.
Glycolized frost: The cold glycol is used in the form of a hot glycol cream. The heat generated by the compressor's exhaust gas is used to heat the glycol through a heat exchanger and stored in a storage tank. The pump needs to be defrosted (cooling fan). , aluminum tube) evaporator, while closing the normal night, return valve. When the temperature of the evaporator rises, the frost layer on the surface of the evaporator is melted or peeled off; the pre-cooling tank adopts a hot gas defrosting method, and the high-pressure and high-temperature gas discharged from the compressor is sent to the evaporator to release heat and defrost. The method of defrosting is economical and reliable, convenient for maintenance and management, and its investment and construction are not difficult.
Electrothermal defrosting: Electrothermal defrosting is the use of electric heating tubes arranged inside the cooling fan to heat the fins to melt the frost layer. This method is simple and easy to operate, but the chiller has an electric heating tube of 40~100W per square metre of heat transfer area, which consumes too much power and has a great impact on the temperature fluctuation of the chiller. It does not save energy; Cream electric heating tube power is very large, the quality of the heating tube is not good or the use of a long time, easy to burn or even cause a fire, electric heating defrost there is a serious security risk.
Water defrosting: Water defrosting is the use of a water pump or water spray device to spray water on the outer surface of the evaporator so that the frost layer is melted and flushed away by the heat of the water. Water flushing is a very effective defrosting method because of its simple operation and short time. In a cold store with a very low temperature, after repeated flushing, the water temperature is too low and will affect the effect of the flushing. If the cream is not cleaned in a set period of time, the frost layer may change after the cooling fan works normally. Ice formation makes it harder for the next flush.
Hot working defrosting: Hot working defrosting is the use of high-temperature superheated refrigerant vapor discharged from the compressor, after the oil separator, into the evaporator, the evaporator temporarily as a condenser, the use of hot working fluid The heat released during condensation melts the frost layer on the evaporator surface. At the same time, the original refrigerant and lubricating oil accumulated in the evaporator are discharged into the defrosting drum or the low-pressure circulating drum by means of hot working fluid pressure or gravity. When hot air defrosting, the load of the condenser is reduced, and the operation of the condenser can also save part of the electrical energy. From this, it can be seen that defrosting of hot work mass is the most economical way of defrosting a chiller.
At present, the barrel pump supply system increases the investment cost due to the addition of many ancillary equipment and the increase in ancillary equipment. It is only applied to large-scale systems. The medium and small cold storage, which accounts for the majority of the market, uses the advantage of the fact that Freon is easy to realize automatic control. It is very popular to use the direct expansion liquid supply plus drainage barrel for hot-fluorine defrosting.
Basic principle: The chiller is heated and defrosted with the hot Freon vapor discharged from the compressor. After defrosting, the Freon liquid is discharged into the drainage tank, and the pressure is increased to supply the Freon in the drainage tank to the supply pipe for cooling. When defrosting, the direction of flow of the drainage is the same as that of the refrigeration cycle.
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