The constant temperature and humidity test chamber is a widely used environmental testing equipment in modern industry and scientific research fields, mainly used to simulate various extreme temperature and humidity environments to test the performance of products under specific conditions. However, during the use of the device, slow or inability to cool down may occur. Understanding the cause of the malfunction and mastering the solution can not only extend the service life of the equipment, but also improve work efficiency. This article will start from the common reasons for slow cooling, analyze them one by one, and provide effective solutions.

1 Reasons For Slow Cooling

(1) The door of the test chamber is not tightly closed

In tests, the sealing performance of the chamber door directly affects the working efficiency. If the door of the test chamber is not completely closed and there is a significant temperature difference between the inside and outside of the chamber, the hot air from the outside will continue to penetrate into the test chamber, causing a significant slowdown in the cooling rate of the test chamber. Therefore, during testing, it is necessary to ensure that the door of the test chamber is completely closed and avoid frequent opening during the testing process. If the box door is frequently opened and closed, it will not only affect the accuracy of experimental data, but also increase the operating load of the equipment.

(2)Excessive dust accumulation in the condenser

The cleanliness of the condenser is crucial for the cooling effect of the test chamber. If the condenser accumulates too much dust, it may lead to poor heat dissipation of the equipment, thereby affecting the efficiency of the entire refrigeration system. In this case, the heat dissipation speed of the condenser will significantly slow down, leading to difficulties in cooling down. Therefore, regular cleaning of the condenser to ensure that its surface is free of dust and blockage is an important measure to maintain the normal operation of the constant temperature and humidity test chamber.

(3)The ambient temperature is too high

The constant temperature and humidity test chamber has certain requirements for the temperature of its environment. Generally speaking, the temperature of the equipment operating environment should be maintained within a relatively suitable range. This is because high ambient temperatures increase the heat dissipation burden on equipment, leading to an increase in the workload of the refrigeration system and slow cooling. To solve this problem, measures can be taken to lower the ambient temperature, such as installing air conditioning in the laboratory or accelerating air flow through fans to help the test chamber cool down faster.

(4) Issues with refrigeration compressors

The refrigeration compressor is one of the core components of the constant temperature and humidity test chamber, and its working state directly affects the cooling effect of the equipment. If it is found during the testing process that the equipment cannot maintain temperature, the first thing to check is whether the refrigeration compressor can start normally. If the compressor starts normally during equipment operation, it indicates that the circuit from the main power supply to the compressor is normal and there is no problem with the electrical system. But if the compressor cannot start, it may be an electrical fault or a problem with the compressor itself, requiring further inspection and repair.

2 Trouble Shooting and Solution

To address the cooling issues mentioned above, the following methods can be used to investigate and handle them one by one to ensure that the equipment can resume normal operation as soon as possible.

(1) Check the working status of the compressor

During the operation of the constant temperature and humidity test chamber, the working status of the compressor can be determined by the temperature changes of its exhaust and return pipes.

-The exhaust pipe is slightly hot and the return pipe is frozen: If the temperature of the compressor’s exhaust pipe is slightly hot, but the return pipe shows obvious icing.Obviously there is severe frost on the evaporator. This situation can be solved by heating treatment. Setting the temperature of the device to 60 ℃ and running it for 1 hour before attempting to cool down can usually eliminate faults caused by frosting.

-The exhaust pipe is slightly hot and the return pipe is slightly cool: If the exhaust pipe of the compressor is slightly hot and the temperature of the return pipe is low, Obviously there is insufficient refrigerant. Regularly replenish refrigerant is sufficient.

(2) Cleaning and maintenance of condenser

-The exhaust pipe is very hot and the return pipe is slightly cool: When the compressor is working, the temperature of the exhaust pipe is significantly too high, while the return pipe is low. That’s because the condenser has something problem on heat dissipation. The dust on the condenser will hinder heat dissipation and affect the cooling effect. Therefore, users should regularly clean the condenser and keep it clean to ensure good heat dissipation performance of the equipment.

(3) Check the aging condition

For long-term constant temperature and humidity test chambers, equipment aging may be one of the reasons for slow cooling. After prolonged use, various components of the equipment may experience wear and aging, especially core components such as compressors and condensers. If the device has been in use for many years and the cooling problem cannot be solved through simple cleaning and maintenance, it is recommended to consider replacing old components or directly updating the device to ensure its performance and reliability.

3 How To Prevent Cooling Faults?

Although equipment failures are inevitable, reasonable preventive measures can effectively reduce the probability of equipment cooling problems. Here are some recommended preventive measures:

(1) Regular maintenance and upkeep

Users should regularly clean key components such as condensers and evaporators to maintain their good heat dissipation performance. At the same time, regularly check the working status of the compressor to ensure that all internal systems of the equipment are operating normally.

(2) Control the device usage environment

The working environment of the constant temperature and humidity test chamber has a significant impact on the operational efficiency of the equipment. Users should try to avoid placing devices in high-temperature environments and ensure that the temperature in the room where the device is located is appropriate. If possible, it is best to provide a constant temperature working environment for the equipment to reduce its heat dissipation pressure and improve its operating efficiency.

(3) Regularly check the refrigerant

The adequacy of refrigerant directly affects the cooling effect of the equipment. If insufficient refrigerant is found, it should be replenished in a timely manner.