Factors affecting the excessively low evaporating temperature of the refrigeration system in a constant temperature and humidity test chamber include several issues that may arise due to aging or improper usage. For instance, if the refrigeration system’s evaporating temperature is too low, addressing such problems is crucial. Below, using the AiBo Instrument Variable Frequency Constant Temperature and Humidity Test Chamber as an example, we’ll explain the main factors influencing this issue:
Main factors influencing the excessively low evaporating temperature of the refrigeration system in a constant temperature and humidity test chamber:
1. Insufficient refrigerant in the refrigeration system.
2. Insufficient opening of the throttle valve, resulting in inadequate refrigerant flow into the evaporator. This causes most of the refrigerant vapor in the evaporator to be superheated, reducing the cooling capacity and subsequently lowering the evaporating pressure.
3. Blockages in the refrigeration system, particularly in fluorine-containing systems, where contaminants can clog dry filters and narrow pipes. Presence of moisture in the system can lead to situations like ice blockages in the expansion valve.
4. Malfunctioning solenoid valves or failure to open relevant valves.
5. Frost or ice formation on the surface of the direct evaporative cooler increases thermal resistance, thereby affecting heat transfer effectiveness and gradually lowering the evaporating temperature, and consequently the evaporating pressure.
6. Mismatch between the evaporator area and the cooling capacity of the compressor, i.e., the evaporator’s evaporating area is too small.
7. Excessive cooling water in the water cooling system resulting in insufficient refrigerant quantity. Adjusting the flow rates of cooling water and refrigerant is necessary in such cases.
8. Inadequate adjustment of the load regulating switch, where the refrigeration capacity of the refrigeration equipment exceeds the required heat load.
9. When the evaporating temperature in the constant temperature and humidity test chamber is excessively low, identifying the cause and adjusting the unit’s operation to a reasonable state are essential steps.
