Why is your refrigeration unit so power-hungry?-Changzhou yanghu refrigeration equipment co., LTD.

Why is your refrigeration unit so power-hungry?

发布时间：

2016-08-24

Energy-saving measures for refrigeration operation The amount of cooling equipment produced by refrigeration equipment is directly related to the operating conditions of the system. For a compressor with the same structure, speed, and type of refrigerant that have been determined, due to changes in operating conditions and different operation management, the cooling capacity of the compressor is different. Volume and energy consumption also vary. 1. As the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. When the evaporation temperature decreases by 1°C, it will consume 3%-4% more electricity. Therefore, reducing the evaporation temperature difference as much as possible and increasing the evaporation temperature not only saves power consumption, but also improves the relative humidity of the cold room. 2. As the condensing temperature increases, the compression ratio of the compressor increases,

Energy saving measures for cooling operation

The amount of cooling produced by the refrigeration equipment is directly related to the operating conditions of the system. For a compressor with the same structure, speed, and type of refrigerant, due to changes in operating conditions and different operation management, its cooling capacity and energy consumption Also with change.

1. As the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. When the evaporation temperature decreases by 1°C, it will consume 3%-4% more electricity. Therefore, reducing the evaporation temperature difference as much as possible and increasing the evaporation temperature not only saves power consumption, but also improves the relative humidity of the cold room.

2. With the increase of the condensing temperature, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. The condensing temperature is between 25°C and 40°C, and the power consumption increases by about 3.2% for every 1°C increase.

3. When the heat exchange surfaces of the condenser and the evaporator are covered with oil layers, the condensation temperature will increase and the evaporation temperature will decrease, resulting in a decrease in cooling capacity and an increase in power consumption. When there is a 0.1mm thick oil layer on the inner surface of the condenser, the cooling capacity of the compressor will decrease by 16.6, and the power consumption will increase by 12.4; The evaporation temperature drops by 2.5℃, and the power consumption increases by 9.7.

4. When the air accumulates in the condenser, it will cause the condensing pressure to rise. When the partial pressure of the non-condensable gas reaches 1.96105Pa, the power consumption of the compressor will increase by 18.

5. When the scale on the tube wall of the condenser reaches 1.5mm, the condensing temperature will increase by 2.8℃ compared with the temperature before scaling, and the power consumption will increase 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 makes the air flow between the fins difficult, reducing the appearance of The heat transfer coefficient and heat dissipation area. When the indoor temperature is lower than 0°C and the temperature difference between the two sides of the evaporator tube group is 10°C, the heat transfer coefficient of the evaporator after working for one month is about 70 before frosting.

7. The gas inhaled by the compressor allows a certain degree of superheat, but if the degree of superheat is too large, the specific volume of the inhaled gas increases, the cooling capacity decreases, and the relative power consumption increases.

8. When the compressor comes to frost, quickly close the small suction valve, sharply reduce the cooling capacity, and relatively increase the power consumption.

Through the above analysis, it can be seen that doing a good job in the operation management of refrigeration equipment is an important part of improving the economic benefits of the refrigeration system.

Strengthen equipment operation management, establish electricity consumption management and unit consumption statistics system. Electricity consumption and material consumption quotas that are easy to assess, increase necessary measuring instruments and appliances, carry out energy conservation and technological transformation work, and consolidate energy conservation work from the system.

1. Correctly control and adjust the liquid supply of the system, and avoid the occurrence of over-humidification and overheating of the compressor suction.

2. Reasonably select the number of compressors in operation to match the cooling capacity with the heat load of the system.

3. According to process requirements and changes in outside temperature, properly adjust the number of fans and pumps in operation.

4. Regularly drain oil, release air, defrost and remove scale, maintain good heat transfer effect of the equipment, and avoid excessive condensing pressure and low evaporation pressure.

Improve the working conditions of refrigeration equipment as much as possible

1. Improve water quality, slow down scaling, improve the condensation effect of the condenser, and reduce the condensation temperature.

2. When the motor load rate of refrigeration equipment is below 0.4, the motor can be changed from △ to Y connection to improve the power factor, and it is required that △ and Y connection can be automatically switched.

3. Try to use automatic control operation instead of manual operation, which can realize the operation of the refrigeration system under the best working conditions, which can save 5-15% of electricity.