Can the use of closed cooling towers reduce the operating costs of cold storage?

Jiangsu Yunuo Cooling Technology will introduce to you whether the use of closed cooling towers can reduce the operating costs of cold storage.

First, prevent the transpiration temperature of the closed cooling tower from being too low. If the temperature difference between the transpiration temperature and the warehouse temperature becomes larger, the transpiration temperature will be too low, which will lead to a decrease in the cooling coefficient and an increase in energy consumption. According to the budget, when other conditions remain unchanged, when the transpiration temperature drops by 1°C, it will consume 1~2% more power. In addition, the larger the temperature difference, the larger the dehumidification capacity of the air cooler will be, and the lower the humidity of the warehouse will be, which will cause the dry consumption of food to expand and the quality of food to decrease. The difference between the transpiration temperature and the warehouse temperature we usually use is generally 10°C. The transpiration temperature of the fruit and vegetable cold storage is generally planned to be about -10°C, the freezing room is -28°C, and the freezing room is -33°C. In China, the temperature difference between many fruit and vegetable storage warehouses is about 15℃, while in Europe and other developed economies, the difference between transpiration temperature and warehouse temperature is generally 3~5℃.

The reasons and solutions for the low transpiration temperature caused by the closed cooling tower. The evaporator (cooler) is too small: there is a problem in planning, or the actual storage type is different from the planned storage type, and the heat load is increased. For example, the cold storage for apple storage is used to store garlic sprouts. Due to the harvest period of garlic sprouts in a production area Only for a few days, it is impossible to achieve the same daily purchase volume of 5%-15% of the warehouse capacity as Apple, but it will be full in 3 to 5 days. Therefore, if you want to reduce the temperature to a suitable storage temperature in time, you can only This is achieved by lowering the transpiration temperature. Evaporator transpiration area should be added or replaced. The compressor cooling capacity is too large. After the warehouse load was reduced, the energy of the compressor was not cut in time. The compressor of the cold storage is matched according to the large load of the refrigeration system, and the large load of the fruit and vegetable cold storage occurs during the storage stage of the goods. At most other times, the load of the compressor is less than 50%. When the storage temperature drops to a suitable storage temperature, the system load is greatly reduced. For example, if a large machine is still open, it will form a large horse-drawn trolley, the temperature difference will increase, and the power consumption will increase. The number of open compressors should be reduced or the number of operating cylinders should be reduced by energy regulation equipment according to changes in warehouse load.

The evaporator is not defrosted in time, and the evaporator coil is frosted to reduce the heat transfer coefficient, increase the thermal resistance, reduce the heat transfer effect, and reduce the amount of refrigerant evaporation. When the transpiration pressure drops, the corresponding transpiration temperature drops, so defrost in time. There is lubricating oil in the evaporator: the lubricating oil in the evaporator will form an oil film on the tube wall of the transpiration coil, which will also reduce the heat transfer coefficient, increase the thermal resistance, reduce the heat transfer effect, and reduce the amount of refrigerant evaporation. , resulting in a decrease in the transpiration pressure of the system and a corresponding decrease in the transpiration temperature, so the system should be drained in time, and the lubricating oil in the evaporator should be brought out by hot ammonia flushing. Expansion valve opening is too small: The expansion valve opening is too small, and the liquid supply of the system is small. Under the condition of constant compressor energy, the transpiration pressure drops, resulting in a decrease in the transpiration temperature. The expansion valve opening should be added.

The above is the relevant content introduced by Jiangsu Yunuo Cooling Technology.