The reason for the large power consumption of the chiller

The reason for the large power consumption of the chiller

As the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of cold production increases. So, what are the reasons for the high power consumption of the chiller? Check with okmarts.com editor!

　　1. When the temperature of the additional issuance is lowered by 1°C, it will consume 3%-4% more electricity. Therefore, reduce the evaporation temperature difference as much as possible and increase the evaporation temperature, which not only saves power consumption, but also increases the relative humidity of the cold room.

2. As the condensation temperature increases, the compression ratio of the compressor increases, and the energy consumption per unit of cold production increases. The condensing temperature is between 25-40℃, and every 1℃ increase will increase the power consumption by about 3.2%.

　　3. When the heat exchange surface of the condenser and the evaporator is covered with an oil layer, it will cause the condensation temperature to rise and the evaporation temperature to decrease, resulting in a decrease in cold production and an increase in power consumption. When a 0.1mm thick oil layer accumulates on the inner surface of the condenser, it will reduce the compressor’s cooling output by 16.6% and increase power consumption by 12.4%; when the 0.1mm thick oil layer accumulates on the inner surface of the evaporator, in order to maintain the set low temperature As required, the evaporation temperature will drop by 2.5°C and the power consumption will increase by 9.7%.

　　4. When air accumulates in the condenser, it will cause the condensing pressure to rise. When the partial pressure of non-condensable gas reaches 1.96×105Pa, the compressor power consumption 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 the scale, 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 fin tube is frosted, which not only increases the heat transfer resistance, but also makes the air flow through the fin difficult, reducing the external heat transfer. Thermal coefficient and heat dissipation area. When the indoor temperature is below 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 is about 70% before frosting after one month of operation.

　　7. The gas sucked in by the compressor is allowed to have a certain degree of superheat, but the degree of superheat is too high, the specific volume of the sucked gas increases, its cold production decreases, and the relative power consumption increases.

8. When the compressor is frosted, quickly close the suction valve, which drastically reduces the cold output and relatively increases the power consumption.