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one  Refrigeration equipment operation management

How much the cooling capacity of refrigeration equipment is directly related to the operating conditions of the system. For compressors with the same structure, speed, and type of refrigerant, the operating conditions are different and the operation and management are different. The cooling capacity and energy consumption are different. Also with the changes.

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

2. As the condensing temperature increases, 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. For every 1°C increase, the power consumption increases by about 3.2%.

3. When the heat exchange surfaces of the condenser and the evaporator are covered with an oil layer, the condensing temperature will increase and the evaporation temperature will decrease, resulting in a reduction in the amount of produced cooling and an increase in the power consumption. When a 0.1mm thick oil layer is accumulated on the inner surface of the condenser, the cooling capacity of the compressor will be reduced by 16.6, and the power consumption will be increased by 12.4. When the inner surface of the evaporator is accumulated with 0.1mm thick oil layer, in order to maintain the established low temperature requirements, The evaporation temperature drops by 2.5°C and the power consumption increases by 9.7.

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

5. When the scale of the condenser wall reaches 1.5mm, the condensing temperature rises by 2.8°C from the temperature before scaling, and the power consumption increases by 9.7.

6, the evaporator surface covered with a layer of frost, so that the heat transfer coefficient decreases, especially when the outer surface of the finned tube frost, not only increases the thermal resistance, but also makes the air flow between the fins difficult to reduce appearance The heat transfer coefficient and heat dissipation area. When the indoor temperature is lower than 0°C, when the temperature difference between the two sides of the evaporator tube group is 10°C, after the evaporator is operated for one month, the heat transfer coefficient is about 70°C before frosting.

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

8, the compressor to frost, quickly close the small suction valve, drastically reduce the amount of cooling, the relative increase in power consumption.

Through the above analysis, we can see that doing a good job in the operation and management of refrigeration equipment is an important part of improving the economic efficiency of refrigeration systems.

two Energy-saving measures for cooling operation

Strengthen the operation of equipment management, establish electricity consumption management and consumption statistics system. Conveniently assess the amount of electricity consumption and material consumption, increase the necessary measurement instruments and appliances, carry out energy-saving and technological transformation work, and consolidate the energy-saving work from the system.

1. Correctly control and adjust the amount of liquid supplied by the system and avoid the occurrence of excessive suction and overheating of the compressor suction.

2. Reasonably select the number of compressors to operate so that the cooling capacity matches the thermal load of the system.

3, according to the process requirements and changes in outside air temperature, properly adjust the number of fans and pumps running.

4, regular oil, air release, defrost and remove scale, keep the device a good heat transfer effect, to avoid high condensing pressure and evaporation pressure is too low.

three Improve the working conditions of refrigeration equipment

1. Improve water quality, reduce fouling, improve condenser condensation, and reduce condensation temperature.

2. When the load rate of the refrigeration equipment motor is below 0.4, the motor can be changed from △ to Y to increase the power factor, and △ and Y connections can be switched automatically.

3. Use automatic control operation instead of manual operation as much as possible, which can realize the refrigeration system operating under the best working conditions, which can save 5-15% of electricity.

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