• Refrigerant Leakage: This is one of the common reasons for poor refrigeration effects. Over time or due to the aging of equipment components, tiny cracks may appear in the refrigeration pipes, causing the refrigerant to gradually leak. Insufficient refrigerant will significantly reduce the refrigeration capacity, resulting in a slow temperature drop. For example, in some old laboratory equipment, refrigerant leakage often occurs due to long-term operation and a lack of regular maintenance.
• Reduced Compressor Efficiency: The compressor is a core component of the refrigeration system. If it is severely worn or malfunctioning, the suction and discharge pressures will be abnormal, the compression ratio will decrease, and the refrigeration ability will be weakened. Just as a decline in a car engine's performance will affect its speed, a reduction in the compressor's efficiency will directly affect the cooling speed of the laboratory.

• Duct Blockage: If the air ducts inside the laboratory are not cleaned for a long time, dust, debris, and other substances will accumulate in them, impeding the air circulation. Just as blocked blood vessels in the human body will affect blood circulation, blocked air ducts will hinder the exchange of hot and cold air, resulting in uneven temperature distribution and a slow temperature drop. This problem is particularly prominent in some laboratories in harsh environments, such as those close to factory workshops or in areas with a lot of dust.
• Fan Malfunctions: Fans are responsible for driving the air to circulate in the laboratory. If the motor of the fan is damaged, the blades are deformed, or the rotation speed is abnormal, the amount of air circulation will be insufficient, and the cooling capacity cannot be effectively transferred to every corner, thus causing a slow temperature drop. For example, in some high-humidity environments, the motor of the fan may be damaged due to moisture, affecting its normal operation.

• High Heat Generation of Equipment: If there are a large number of heat-generating equipment in the laboratory, such as electronic instruments and high-power lamps, and the heat generated during the operation of these equipment exceeds the load capacity of the laboratory's refrigeration system, it will be difficult for the temperature to drop rapidly. For example, in some electronic chip research and development laboratories, many high-precision testing equipment operate simultaneously, releasing a large amount of heat and posing a great challenge to the constant temperature and humidity environment.
• Frequent Personnel Activities: Personnel are also a non-negligible heat source. When there are many people in the laboratory and they enter and leave frequently, the heat emitted by the human body and the hot air brought in from the outside will increase the heat load of the laboratory. Especially in some small laboratories with a relatively high personnel density, the impact of this increased heat load on the temperature is more obvious.

• Temperature Sensor Malfunctions: Temperature sensors are responsible for real-time monitoring of the laboratory's temperature and sending signals back to the control system to adjust the refrigeration capacity. If the sensors have deviations or are damaged, the control system will receive incorrect temperature information, making it unable to accurately start or adjust the refrigeration system, resulting in abnormal temperature drops. For example, if the sensors are bumped or their accuracy decreases after long-term use, this problem will occur.
• Improper Control System Parameter Settings: Even if the refrigeration system and other hardware equipment are normal, if the parameters such as the temperature set value and the refrigeration start-stop temperature difference in the control system are not set reasonably, the cooling speed and effect of the laboratory will be affected. For example, if the refrigeration start-stop temperature difference is set too large, the refrigeration system will not start in a timely manner, causing a slow temperature drop.

1. Refrigeration System Maintenance and Repair

• 2. Optimization of Ventilation and Airflow

   

  3. Reduction of Heat Load
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• 4. Calibration and Optimization of the Control System
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• In conclusion, the problem of slow temperature drop in constant temperature and humidity laboratories may be caused by multiple factors. We need to conduct a comprehensive inspection and analysis from aspects such as the refrigeration system, ventilation and airflow, heat load, and control system, and then adopt targeted solutions. Guangzhou Cleanroom Construction Co., Ltd. has a professional technical team and rich experience, and can provide all-round maintenance, diagnosis, and solutions for your laboratory to ensure that the laboratory is always in a stable and precise temperature and humidity environment, helping your scientific research and production work proceed smoothly. If you encounter any problems during the operation of laboratory equipment, please feel free to contact us!