Users who purchase high-low temperature damp heat test chambers for the first time may not have much in-depth understanding of this equipment, so there will always be some minor problems in the later use process. Today we will give you a detailed explanation:
First, liquid back
1. For high and low temperature damp heat test chamber refrigeration systems using expansion valves, liquid return is closely related to the selection and use of expansion valves. If the expansion valve is too large, the superheat setting is too small, the installation method of the temperature sensor package is incorrect, or the insulation package is damaged, and the expansion valve fails, the liquid may be returned.
2. For a small refrigeration system using a capillary tube, the amount of liquid added is too large to cause liquid return.
3. If the evaporator is severely frosted or the fan fails, the heat transfer will be poor, and the liquid that has not evaporated will cause liquid return.
4. Frequent fluctuations in the temperature of the high and low temperature damp heat test chamber may also cause the expansion valve to fail to react and cause liquid return.
For refrigeration systems that are difficult to avoid with liquid return, the installation of a gas-liquid separator and the use of an evacuation shutdown (ie, allowing the compressor to drain the liquid refrigerant in the evaporator before shutdown) can effectively prevent or reduce the hazard of liquid return.
Second, liquid stroke
1. In order to ensure the safe operation of the high and low temperature damp heat test chamber compressor and prevent the liquid hammer phenomenon, the inhalation temperature is required to be higher than the evaporation temperature, that is, it should have a certain degree of superheat. The degree of superheat can be achieved by adjusting the opening of the expansion valve.
2. Avoid inhaling temperatures that are too high or too low. If the inhalation temperature is too high, that is, the superheat is too large, the high and low temperature damp heat test chamber to compressor discharge temperature will increase. If the suction temperature is too low, it means that the refrigerant is not completely evaporated in the evaporator, which reduces the heat exchange efficiency of the evaporator, and the suction of the wet steam will form a compressor liquid hammer. The suction temperature should be 5 to 10 ° C higher than the evaporation temperature under normal conditions.
This article is from Beijing Yashilin Test Equipment Co., Ltd. Reprint, please indicate the source
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