Analysis of operation of refrigeration system in high and low temperature alternating heat and humidity test chamber
The cooling capacity of the refrigeration equipment of the high and low temperature alternating heat and humidity test chamber is directly related to the operating conditions of the system. For the compressor with the same structure, speed and refrigerant type, the operation and management are different due to the change of operating conditions. Its cooling capacity and energy consumption also change.
1. When the heat exchange surface of the condenser and evaporator of the high-low temperature alternating heat and humidity test chamber is covered with oil layer, the condensation temperature will rise and the evaporation temperature will decrease, resulting in a decrease in cooling capacity 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.
2. 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 1.96105Pa, the power consumption of the compressor should be increased by 18.
3. As the evaporation temperature decreases, the compression ratio of the high-low temperature alternating heat and humidity test chamber 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 test chamber.
4. 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%.
Through the above analysis, it is known that the operation management of the refrigeration equipment of high and low temperature alternating heat and humidity test chambers is an important part of improving the economic benefits of the refrigeration system.
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