Chiller Control System

Chiller Control System

The cooling capacity of the chiller control system is directly related to the operating conditions of the system. For compressors with the same structure, the same speed, and the same refrigerant type, as the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. So, what are the reasons for the increase in power consumption when the chiller control system is running?

1. When the compressor encounters frost, the small suction valve will be closed quickly, the cooling capacity will be drastically reduced, and the power consumption will be relatively increased.

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

3. The surface of the evaporator is covered with a layer of frost, which reduces the heat transfer coefficient. In particular, the outer surface of the finned tube is frosted, which not only increases the heat transfer resistance, but also makes it difficult for the air to flow between the fins and reduces the appearance. 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, the heat transfer coefficient of the evaporator is about 70 after one month of work before frosting.

4. When the heat exchange surface of the condenser and evaporator is covered with a layer of oil, the condensation temperature rises and the evaporation temperature decreases, resulting in a decrease in cooling capacity and an increase in power consumption. When a 0.1mm thick oil layer accumulates 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. When the oil is 0.1mm thick in the inner surface type evaporator, in order to maintain the predetermined low temperature requirement, the evaporation temperature drops by 2.5°C and the power consumption increases by 9.7°C.

5. When the air gathers in the condenser, the pressure of the condenser will increase. When the partial pressure of non-condensable gas reaches 1.96105Pa, the power consumption of the compressor needs to be increased by 18.

6. As the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of production cooling increases. When the evaporation temperature is lowered by 1°C, it consumes 3% to 4%. Therefore, minimizing the evaporation temperature difference and increasing the evaporation temperature not only saves energy consumption, but also increases the relative humidity of the cold room.

7. When the size of the condenser wall reaches 1.5mm, the condensation temperature rises by 2.8°C before the temperature calibration, and the power consumption increases by 9.7°C.

8. The gas inhaled by the compressor is allowed to overheat to a certain extent, but if the overheat is too large, the specific volume of the inhaled gas will increase, the cooling capacity will decrease, and the relative power consumption will increase.

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