How to Determine if the Refrigeration System of a High and Low Temperature Humidity Test Chamber Is Working Properly?

The refrigeration system is a crucial component of a high and low-temperature humidity test chamber, and its normal operation is vital for the accuracy of test results. Here are some simple methods to help you determine whether the refrigeration system is working properly:
1. Check the Compressor Operation
Start the Compressor: After powering on the device, the compressor will start working. Under normal conditions, the compressor will vibrate slightly and emit a uniform operating sound.
Observe Running Time: After running for about half an hour, the refrigeration system will enter a stable working state.
Check Temperature: When the ambient temperature is 32°C, the compressor casing temperature will typically reach around 90°C, which will feel hot to the touch. The temperature at the condenser inlet, 150mm away from the compressor exhaust port, will be around 60°C, which will feel slightly hot when touched.
Abnormal Conditions:
If the compressor temperature is too high, it may be due to an excess of refrigerant or the presence of air or other non-condensable gases in the system.
If the compressor temperature is too low, it may indicate insufficient refrigerant or a system leak.
If the compressor makes abnormal noises during operation, it may be due to internal component damage.
2. Check the Condenser Temperature
Condenser Inlet Temperature: Under normal operation, the temperature at the condenser inlet will be around 60°C, which will feel slightly hot when touched.
Condenser Outlet Temperature: The temperature at the condenser outlet end, 150mm before the dryer filter, will be around 35°C, which will feel slightly warmer than room temperature when touched.
Temperature Gradient: Along the direction of the condenser, touching each section of the tubing should reveal a gradual decrease in temperature.
Abnormal Conditions:
If the condenser inlet and outlet temperatures are too high, it may indicate an excess of refrigerant or poor heat dissipation from the condenser.
If the condenser temperature is too low, it may indicate insufficient refrigerant or a clogged condenser.
3. Check the Evaporator Status
Evaporator Frosting: When opening the test chamber door, the evaporator should emit cold air and may be covered with a thin, uniform layer of frost.
Touch the Evaporator: Quickly touch the evaporator with a wet finger; the finger should feel a sticky sensation.
Listen for Sounds: Near the evaporator, you should hear sounds similar to flowing water or a “hissing” airflow.
Abnormal Conditions:
If the evaporator does not frost or the frosting is uneven, it may indicate insufficient refrigerant or a clogged evaporator.
If the evaporator does not emit cold air, it may indicate a refrigeration system failure.
4. Check System Pressure
Condenser Pressure: Under normal conditions, the condenser pressure should be within a reasonable range. If the condenser pressure is too high, it may indicate an excess of refrigerant or air in the system.
Evaporator Pressure: If the evaporator pressure is too low, it may indicate insufficient refrigerant or a system leak.
Abnormal Conditions:
If the condenser pressure is too high, it may be due to an excess of refrigerant or poor heat dissipation from the condenser.
If the evaporator pressure is too low, it may indicate insufficient refrigerant or a system leak.
Summary
By following the above methods, you can preliminarily determine whether the refrigeration system of a high and low-temperature humidity test chamber is working properly. If you encounter any abnormalities during device operation, it is recommended to promptly contact after-sales professionals for troubleshooting and maintenance to ensure the normal operation of the device and the accuracy of test results.