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first, rational use of the warehouse, off-season timely and storage

The power consumption of the cold storage room is calculated according to the amount of cold consumption in the cold storage room, which usually includes two parts: first, the cooling consumption of goods and cold storage; The second is the cooling consumption of the cold storage room itself (that is, the envelope structure) and the operation management. The key to saving electricity is the utilization rate of the cold storage room, and the low utilization rate of the cold storage room consumes more cold, and the power consumption is more. In actual operation, because the motor power equipped is selected according to the refrigeration capacity of the machine, that is, the cooling consumption of the warehouse is less than the refrigeration capacity of the refrigerator. When the cold storage runs in the off-season, because the cargo stored in the cold storage room is less, the operation is a "big horse trolley", which wastes electric energy. Therefore, in the off-season, the goods in several cold storage rooms can be stored in time according to the storage temperature to reduce energy consumption.

Second, regular discharge of oil, descaling and air

When there is a 0.1mm thick oil film in the evaporator tube, in order to maintain the set temperature requirements, the evaporation temperature will be reduced by 2.5℃, and the power consumption will be increased by more than 10%; When the scale on the wall of the water pipe in the condenser reaches 1.5mm, the condensing temperature will increase by 2.8℃ compared with the original temperature, and the power consumption will increase by 9.7%. When the refrigeration system is mixed with non-condensable gas and its partial pressure value reaches 0.196MPa, the power consumption will increase by about 18%. This shows the importance of regular oil discharge, descaling and air discharge in the cold storage refrigeration system.

Third, reasonable adjustment of cold storage evaporator, timely defrosting

In general, for every 1℃ increase in the evaporation temperature of the cold storage, 2% to 2.5% can be saved. Therefore, under the premise of satisfying the product refrigeration process, the evaporation temperature can be increased as much as possible by adjusting the liquid supply. The thermal resistance of the frost layer is generally much larger than that of the steel pipe, and when the thickness of the frost layer is greater than 10mm, its heat transfer efficiency is reduced by more than 30%. When the temperature difference between the inside and outside of the tube wall is 10 ° C and the reservoir temperature is -18 ° C, the heat transfer coefficient K value of the evaporator is only about 70% of the original after the operation of the refrigeration system for one month. When the frost formation of the chiller is particularly serious, not only the thermal resistance increases, but also the flow resistance of the air increases, and the air can not be supplied when it is serious, so it is necessary to timely defrost the surface of the evaporator. In the refrigeration system of large and medium-sized cold storage, hot ammonia (fluorine) defrosting and water defrosting are generally used instead of the electric defrosting method with high energy consumption, while the small freon refrigeration system can use electric defrosting to simplify the pipeline, but the appropriate electric heating power should be configured according to the heat required for the frost layer to melt.

Fourth, pay attention to the energy saving of the internal lighting system

Cold storage lighting should be on the basis of safety, science and rationality, from the perspective of energy saving and environmental protection, according to the area, height and warehouse temperature of the cold storage room. The lighting in the cold storage is generally concentrated in the working area. The lights should be turned off in time to reduce the heat load and power consumption of the warehouse while ensuring the safety of the operator. At the same time, we should try to use high-efficiency low-consumption and pressure-resistant lighting fixtures to reduce the replacement frequency of lamps. LED lighting system has the advantages of environmental protection and power saving, uniform illumination, good luminous efficiency at low temperature and high power supply efficiency, which is a promising new light source and the development direction of lighting system in cold storage in the future.