According to statistics, the overall energy consumption level of refrigeration enterprises is relatively high, and the overall average level is much higher than the average level of the same industry abroad. According to the requirements of the Institute of Refrigeration (IIR): in the next 20 years, "reduce the energy consumption of each refrigeration equipment by 30%" "~50%" goal, I will face a huge challenge, which makes it extremely important to explore ways to save energy in cold storage, reduce unit cooling consumption of refrigerated products, improve system utilization, and strengthen warehouse management. How to reduce energy consumption in cold storage cost, realize system energy saving.
What aspects should we pay attention to in terms of energy saving in cold storage operation management
1. Regularly inspect and maintain the enclosure structure
The maintenance of the cold storage structure should also attract great attention in the cold storage. Infrared detection is currently used in many industries. The so-called infrared thermal imager detects infrared energy (heat) through non-contact and converts it into an electrical signal. A detection device that generates thermal images and temperature values on the display and can calculate the temperature values. It can accurately quantify the detected heat, so that you can not only observe the thermal images, but also accurately identify and identify the faulty areas that generate heat. Rigorous analysis.
2. Make reasonable use of the running time at night
(1) Effective use of peak and valley electricity at night
Different electricity charging standards are implemented according to different electricity consumption time periods, and various provinces and cities have also adjusted according to actual conditions. There are great differences between peaks and valleys, and the cold storage consumes a lot of energy. It can be used to store cold storage at night to avoid the peak period of electricity consumption during the day.
(2) Reasonable use of temperature difference between day and night
I have a large temperature difference between day and night. According to statistics, every 1°C decrease in the condensation temperature can reduce the power consumption of the compressor by 1.5% [22], and the cooling capacity per unit shaft power will increase by about 2.6%. The ambient temperature at night is low, and the condensation temperature will also drop. According to the literature, the temperature difference between day and night in oceanic climate areas can reach 6-10°C, in continental climates it can reach 10-15°C, and in southern regions it can reach 8-12°C , so increasing the start-up time at night is beneficial to the energy saving of the cold storage.
3. Drain oil in time
The oil attached to the surface of the heat exchanger will cause the evaporation temperature to drop and the condensation temperature to rise, so the oil should be drained in time, and the automatic control method can be adopted, which can not only reduce the labor load of workers but also control the precise oil draining time and amount.
4. Prevent non-condensable gas from entering the pipeline
Since the adiabatic index of air (n=1.41) is greater than that of ammonia (n=1.28), when there is non-condensable gas in the refrigeration system, the discharge temperature of the refrigeration compressor will increase due to the increase in condensing pressure and compressed air. Studies have shown that: when non-condensable gas is mixed in the refrigeration system and its partial pressure reaches 0.2aMP, the power consumption of the system will increase by 18%, and the cooling capacity will decrease by 8%.
5. Timely defrosting
The heat transfer coefficient of steel is generally about 80 times that of frost. If frost forms on the surface of the evaporator, it will increase the thermal resistance of the pipeline, reduce the heat transfer coefficient, and reduce the cooling capacity. It should be defrosted in time to avoid unnecessary energy consumption of the system.
Energy saving will definitely become the theme of social development in the future. Cold storage companies should enhance their awareness of social competition and continuously improve under market economy conditions so as to improve the development of our cold storage industry.
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Post time: Jul-15-2023