Constant Temperature and Humidity Chamber: Analysis of Cooling Failure
Customers often encounter issues with constant temperature and humidity equipment that fail to cool properly. In this article, we will explore the possible causes of such failures and provide a detailed analysis for reference.
First, check if the refrigeration compressor starts when the test chamber is in operation. If the compressor operates normally, it indicates that the electrical system from the main power supply to the compressors is functioning correctly. No electrical issues are present at this stage.
Next, proceed to examine the refrigeration system. Observe the exhaust and suction pressures of the low-temperature (R23) compressors in both refrigeration units. If these pressures are lower than normal, and the suction pressure is evacuated, it suggests that the refrigerant capacity of the main unit is insufficient.
Additionally, touch the exhaust and suction lines of the R23 compressor. If the exhaust line is not hot and the suction line is not cold (not frosted), this further confirms a refrigerant shortage in the main unit.
To determine the cause of the failure, consider the control process of the test chamber. The chamber has two sets of refrigeration units: the main unit and the auxiliary unit. During high cooling demand, both units operate simultaneously. However, once the temperature stabilizes, the auxiliary unit stops, and the main unit maintains the temperature. If the main unit’s R23 refrigerant leaks, its cooling effect will be reduced. This can lead to a drop in cooling efficiency, causing the temperature to rise during the maintenance phase.
When the temperature rises beyond the set point, the control system restarts the auxiliary unit to cool down again. This cycle repeats, leading to the observed fault phenomenon.
Through leak detection using a detector and soapy water, a crack of approximately 1 cm was found on the stem of a hot gas bypass solenoid valve. Replacing the valve and refilling the refrigerant restored normal operation of the system.
In summary, identifying and resolving such faults requires a systematic approach. Start by checking external factors, then move to internal components—first the electrical system, then the refrigeration system. A deep understanding of the test chamber's working principle and operational process is essential for accurate diagnosis and efficient troubleshooting.
This article aims to assist environmental equipment operators and maintenance personnel in quickly addressing similar issues. By sharing knowledge and experience, we can collectively advance the field of environmental engineering in China.
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