When the aerospace high vacuum environment simulation device is in operation, if it is used improperly, power consumption may occur, so how to find and avoid it?
As the evaporation temperature of the aerospace high vacuum environment simulation device decreases, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. When the evaporation temperature is lowered by 1 ° C, it consumes 3% to 4% more. Therefore, the evaporation temperature difference is reduced as much as possible, and the evaporation temperature is increased, which not only saves power consumption, but also improves the relative humidity of the cold room. 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 is increased by about 3.2%.
When the heat transfer surface of the condenser and evaporator of the aerospace high vacuum environment simulation device is covered with an oil layer, the condensation temperature rises and the evaporation temperature decreases, resulting in a decrease in the amount of cooling and an increase in power consumption. When a 0.1mm thick oil layer is accumulated on the inner surface of the condenser, the compressor cooling capacity will be reduced by 16.6, and the power consumption will increase by 12.4. When the oil is 0.1mm thick on the inner surface of the 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.
When the air collects in the condenser, it will cause the condensing pressure to rise. When the partial pressure of the non-condensing gas reaches 1.96105 Pa, the power consumption of the compressor is increased by 18. When the scale of the condenser wall reaches 1.5 mm, the condensation temperature rises by 2.8 ° C than the temperature before scaling, and the power consumption increases by 9.7.
The aerospace high vacuum environment simulation device is covered with a frost layer on the surface of the evaporator, which reduces the heat transfer coefficient. Especially when the outer surface of the finned tube is frosted, it not only increases the heat transfer resistance but also the air between the fins. It is difficult to flow, reducing the heat transfer coefficient and heat dissipation area of the exterior. 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 after working for one month is about 70 before frosting.
Aerospace high vacuum environment simulation device The gas inhaled by the compressor allows a certain degree of superheat, but the superheat is too large, the specific volume of the inhaled gas increases, the cooling capacity decreases, and the relative power consumption increases. After discovering the power consumption behavior, it is necessary to check whether there is a corresponding fault in time and solve it in time.