The cooling effect of central air conditioning is not good? The reason is revealed

After the summer solstice, hot weather followed one after another. In this scorching hot summer day, whether in supermarkets, hotels, restaurants, shopping malls, office buildings, etc., air conditioning has almost become a must-have item. People enjoy the coolness of summer and experience the comfort brought by air conditioning. Beautiful. However, as the central air conditioner gradually enters the peak period of use, many people will find that after a little time of use, the cooling effect of the central air conditioner is not as good as before. What is the reason? Is there an effective solution? Today, let's find the cause and solution together!

Central air-conditioning refrigeration principle

Before analyzing the reason why central air-conditioning is not refrigerating, let’s first understand the refrigeration principle of air-conditioning:

The refrigeration system of central air-conditioning consists of four basic parts: compressor, condenser, throttle, and evaporator. The four parts are connected in a certain order by copper pipes to form a closed system, and a certain amount of refrigeration is filled in the system The general air-conditioning refrigerant is Freon.

Take refrigeration as an example, the compressor sucks in low-temperature and low-pressure Freon gas from the evaporator, compresses it into high-temperature and high-pressure Freon gas, and then flows through the thermal expansion valve (capillary tube), throttling to low temperature and low pressure The low-temperature and low-pressure Freon liquid absorbs the heat from the indoor air in the evaporator and becomes low-temperature and low-pressure Freon gas, and the low-temperature and low-pressure Freon gas is sucked in by the compressor. After the indoor air passes through the evaporator, it releases heat and the air temperature drops. Such a repeated cycle of 'compression-condensation-throttling-evaporation

Several factors of poor cooling effect

Among the four basic components of central air conditioning, the compressor has been determined by the investment cost. Therefore, the impact The cooling effect of central air-conditioning has the following factors:

1. The design and installation are unreasonable.

The installation of central air-conditioning requires a professional installation company. Some people just save money. This procedure is skipped, resulting in unreasonable design of room types and central air conditioning packages, and the cooling capacity cannot meet the needs of all rooms. For example, when the central air conditioner is installed, the ventilation pipe is too long, and the heat transfer efficiency is reduced, resulting in no cooling; or the location of the air outlet is not installed properly, and the cold air cannot be spread to all corners of the room due to blocking, which will also cause the cooling effect to deteriorate.

2. Insufficient refrigerant or leakage

Whether the refrigerant of the central air conditioner needs to be added can be judged according to the outlet pressure of the compressor. If the system is not tightly sealed, it will lead to refrigerant leakage, which will eventually lead to a decrease in cooling capacity. Therefore, the central air-conditioning should be maintained regularly and air tightness inspection should be done.

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