1. Accurate and timely adjustment of the refrigeration system
In actual operation, the refrigeration system is not always in its most ideal working state. Only through accurate operation by the refrigeration warehouse operator and reasonable adjustments to the operation of the refrigeration equipment can the refrigeration unit achieve efficient and energy-saving operational results.
2. Rational utilization of cold storage
The power consumption of a cold storage is calculated based on the operating time of its cooling capacity. In summary, it consists of two parts: one is the cooling capacity during the cooling and storage of goods in the cold storage; the other is the cooling capacity consumption of the cold storage itself (i.e., the envelope structure) and the heat generated by operators. The key to saving electricity is to improve the utilization factor of the cold storage. The lower the utilization factor, the more cooling capacity the cold storage consumes, and the more electric energy it wastes.
In actual operation, the power of the refrigeration compressor is selected based on the cooling capacity of the cold storage. The refrigeration capacity of the refrigeration unit is greater than the cooling consumption of the cold storage. During the off-season operation of the cold storage, due to the less goods stored in the cold storage, the operation of the refrigeration unit consumes more electricity, resulting in energy waste. Therefore, during the off-season, goods from several cold storages can be stored centrally according to the actual situation to reduce energy consumption.
3 Indoor lighting system of cold storage
From the perspective of energy conservation and environmental protection, energy-saving lighting for cold storage should be based on safety and rationality, taking into account factors such as the area and height of the cold storage. The lighting in cold storage is usually concentrated in the working area. Under the premise of ensuring the safety of operators, unnecessary lights should be turned off in a timely manner to reduce the heat load and power consumption of the warehouse. At the same time, lighting fixtures with low energy consumption, high efficiency, and excellent quality should be used as much as possible to reduce the frequency of damage and replacement of lighting fixtures. LED lighting systems have the advantages of environmental protection, energy conservation, uniform lighting, high luminous efficiency at low temperatures, and high power supply efficiency. It is a promising new type of light source and also represents the future direction of indoor lighting systems for cold storage.
4. Regularly inspect the refrigeration system to ensure good heat exchange in the evaporator
Data shows that when there is an oil film of 0.1 millimeters thick inside the evaporator coil, in order to maintain the set temperature requirements of the cold storage, the evaporation temperature needs to drop by 2.5 degrees Celsius, and power consumption will increase by more than 10%. When the scale on the water pipe wall of the condenser reaches 1.5 millimeters, the condensation temperature will increase by 2.8 degrees Celsius, and power consumption will increase by 9.7%. When air is mixed into the refrigeration system, and its partial pressure reaches 0.196 MPa, the power consumption of the unit operation will increase by about 18%. Therefore, it can be seen that it is very important to regularly drain the oil from the evaporator of the cold storage refrigeration system, clean the scale from the condenser, and discharge the air.
5. Timely defrosting of the evaporator in the cold storage
Data indicates that for every 1℃ increase in evaporation temperature, the energy saving in cold storage is approximately 2% to 2.5%. Therefore, under the premise of meeting temperature requirements, the evaporation temperature can be maximized by adjusting the liquid flow to the evaporator. When the frost layer thickness exceeds 10mm, the heat transfer resistance of the frost layer is generally much greater than that of the coil, and the heat transfer efficiency will decrease by more than 30%. When the heat transfer temperature difference in the cold storage is 10℃ and the temperature is -18℃, the heat transfer coefficient K of the coil evaporator refrigeration system after one month of operation is only about 70% of the initial value. When the air cooler is severely frosted, not only does the heat resistance increase, but the airflow resistance also increases, and in severe cases, circulation becomes impossible. Therefore, electric defrosting is generally not designed in the refrigeration system design of large and medium-sized cold storage at the appropriate time. In small Freon refrigeration systems, electric defrosting can be mostly adopted to simplify the piping, but electric heating tubes should be reasonably configured according to the heat required for electric defrosting.
6. Rationally utilize peak and valley electricity for operation
Cold storage can operate at night, taking advantage of the "off-peak" electricity price, without compromising the cooling quality of the refrigerated items. This can reduce the operating time of the refrigeration unit during the day and avoid using high-priced electricity during the day. Currently, the peak-to-valley electricity price ratio in the time-of-use electricity pricing system established by major provinces and cities in China is 3-4:1. Therefore, the utilization rate of "off-peak electricity" can be improved and operating costs can be reduced by using cold storage devices or adjusting the start time.
7. Make rational use of diurnal temperature difference for business operations
China is vast in territory, and there is a significant temperature difference between day and night in many regions. The temperature difference between day and night in marine climate zones is usually 6~10℃, while in continental climate zones, it can reach 10~15℃. The ambient temperature at night is low, and the start-up time at night can be adjusted and extended according to the storage characteristics of the product. Due to the relatively low condensation temperature, it is beneficial to the energy conservation of Fuyang cold storage.
Cold storage installation enterprises suggest that standardized operation of cold storage can save m
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