Refrigeration equipment, how much cold production, and the system operating conditions are directly related to the same structure, speed, refrigerant types have been determined by the compressor, due to changes in operating conditions, operation and management of the different, its cold production and energy consumption with the changes.
1. As the evaporating temperature decreases, the compressor's compression ratio increases, the unit of cold energy consumption increases. When the evaporating temperature is lowered by 1 ℃, more power consumption of 3% -4%. Therefore, as far as possible to reduce the evaporation temperature difference, increase the evaporation temperature, not only save electricity, but also improve the relative humidity between the cold.
2. With the condensing temperature increases, the compressor's compression ratio increases, the unit of cold energy consumption increases. Condensing temperature between 25 ℃ -40 ℃, every 1 ℃, increase power consumption of about 3.2%.
3. condenser and evaporator heat transfer surface covered with oil, will cause the condensing temperature increases, evaporative temperature decreases, resulting in a decrease in the amount of cold production and increased power consumption. Condenser on the inner surface of 0.1mm thick oil layer, will make the compressor cooling capacity down 16.6, power consumption increased by 12.4; evaporator on the inner surface of 0.1mm thick oil layer, in order to maintain a set of low-temperature requirements, evaporation temperature dropped 2.5 ℃, power consumption increased by 9.7.
4. When the air gathered in the condenser, will cause the condensing pressure rises, the non-condensing When the gas partial pressure reaches 1.96105Pa, the compressor power consumption increases by 18.
5. When the condenser tube wall scaling reaches 1.5mm, the condensing temperature rises by 2.8℃ compared with that before scaling, and the power consumption increases by 9.7.
6. The surface of the evaporator is covered with a layer of frost, which reduces the heat transfer coefficient, especially when the outer surface of the finned tube is frosted, which not only increases the heat transfer resistance, but also increases the heat transfer resistance. Increase the heat transfer thermal resistance, but also make the air flow between the fins difficult, reduce the heat transfer coefficient and heat dissipation area of the exterior. When the indoor temperature is lower than 0 ℃, the evaporator tube group on both sides of the temperature difference of 10 ℃, the evaporator work for a month, its heat transfer coefficient is about frost before 70 or so.
7. Compressor inhalation of gas allows a certain degree of superheat, but the degree of superheat is too large, the specific volume of the inhalation gas increases, and its cooling capacity decreases, the relative power consumption increases.
8. The compressor to frost, quickly close the suction valve, sharply reducing the amount of cold production, relative increase in power consumption.
Through the above analysis, it can be seen that a good refrigeration equipment operation management, is to improve the economic efficiency of the cold system is an important part.
Refrigeration operation energy-saving measures
1. Strengthen the operation of equipment management, the establishment of electricity management and unit consumption statistics system. Facilitate the assessment of electricity consumption and material consumption quotas, increase the necessary measuring instruments and appliances, energy saving and technological transformation work, from the system to consolidate energy saving work.
2. Correct operation and maintenance of refrigeration equipment
1, correctly control and regulate the system liquid supply, and to avoid the compressor suction over-wet and overheating phenomenon.
2, a reasonable choice of compressor operation, so that its refrigeration capacity to match the heat load of the system.
3, according to the process requirements and external temperature changes, the appropriate adjustment of the number of fans and pumps running.
4, regular oil, air, defrosting and scale removal, to maintain good heat transfer equipment, to avoid high condensing pressure and evaporating pressure is too low.
Improve the working conditions of the refrigeration equipment as much as possible
1. Improve the water quality, slow down the scaling, improve the condensing effect of the condenser, reduce the condensing temperature.
2. Refrigeration equipment motor load ratio of 0.4 or less, the motor can be changed from △ to Y connection to improve the power factor, and requires △ and Y connection can be automatically switched.
3. Try to use automatic control operation instead of manual operation, you can realize the refrigeration system in the best operating conditions, which can save power 10-15.
I believe that after the above introduction, we have a certain understanding of the analysis of refrigeration equipment operation. Welcome to visit Zhongda Consulting for more information.
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