Energy saving and scientific management of clean room supporting cold storage
Energy saving and scientific management of clean room supporting cold storage
In the design of the clean room supporting cold storage, the unit heat flow of the outer wall of the low temperature cold storage is generally about 11.63W/(m2.h), if the unit heat flow is reduced to 6.98-8.14W/(m2.h), For a 5000t to 10000t low temperature cold storage, the power cost can be reduced by 1...
Text label: Clean room supporting cold storage, energy saving and scientific management
Energy saving and scientific management of clean room supporting cold storage
In the design of the clean room supporting cold storage, the unit heat flow of the outer wall of the low temperature cold storage is generally about 11.63W/(m2.h), if the unit heat flow is reduced to 6.98-8.14W/(m2.h), For a 5000t to 10000t low-temperature cold storage, the power cost can be reduced by about 10%; due to the reduction of the unit heat flow index, the insulation layer of the cold storage envelope structure should be thickened, and the primary investment should be increased, but it is related to the operating cost of the cold storage. Compared with the reduction, it is reasonable to reduce the unit heat flow index of the cold storage enclosure from the perspective of economics and technical management. When the temperature of the warehouse is constant, as the temperature difference between the evaporating temperature and the temperature of the warehouse decreases, the evaporating temperature can be increased accordingly. At this time, if the condensing temperature remains unchanged, it means that the cooling capacity of the refrigeration compressor is increased, that is, the same cooling capacity can be obtained. It can consume less electricity; when the evaporation temperature increases by 1°C, the electricity consumption can be reduced by 3%-4%, and a small temperature difference is also extremely beneficial to reduce the dry consumption of stored food in the warehouse; because the small temperature difference can make the warehouse Obtaining a larger relative humidity can slow down the degree of heat and mass exchange in the air in the warehouse, thereby reducing the dry consumption of stored food, especially for unpackaged stored food, a small temperature difference should be used. The measures to increase the evaporation temperature are mainly to appropriately increase the heat transfer area of u200bu200bthe evaporator and increase the ventilation volume.
During the freezing process of food, the release of heat is actually a uniform exothermic process, so the cooling demand of the cooling equipment during the freezing process is also uneven; the freezing process of food consists of three stages. The first stage is the cooling stage, the temperature of the food drops from > 0 °C to about 0 °C, the second stage is the ice crystal formation stage, the temperature of the food drops from about 0 °C to about -5 °C, and the third stage is the freezing and cooling stage, where the food changes from - 5 ℃ to -15 ℃ all; among the three stages of food freezing, the second stage requires the largest amount of cooling, and all the freezing equipment in the freezing room should be put into operation. There is less heat load in the time, and the wind speed and volume can be appropriately reduced to achieve the purpose of energy saving. In the past, the cooling fan used for freezing is only one speed and cannot be adjusted. If the cooling fan is equipped with a two-speed or variable-speed motor, the circulating air volume for freezing can be be adjusted to achieve the purpose of energy saving. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.
People can determine the corresponding better storage temperature according to the changes of food during low temperature storage and the degree to which the growth and reproduction of low temperature bacteria are inhibited. ℃, for more than half a year of low-temperature storage, the storage temperature should be ≤-18℃; for foods with a large amount of fat, such as fish, in order to prevent the oxidation of fat during low-temperature storage, the storage temperature should be lower than -18℃, preferably The temperature of -25～-20℃, after adopting different storage temperatures, for some products, especially for short-term storage, the evaporating temperature of the refrigeration system can be appropriately increased, thereby increasing the cooling capacity of the refrigeration compressor. Cooler refrigerators are generally used for both refrigeration and cooling. When the goods enter the warehouse, they are used for cooling. At this time, the heat load is large, the air cooler needs a large air volume, and the motor is in high speed; when the goods are cooled Entering the storage period, the heat load is small, the air volume of the cooling fan can be small, and the motor is in a low-speed gear to achieve the purpose of energy saving.
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