Is there a relationship between air conditioning heating and outdoor weather temperature?

Air conditioning and heating are also related to outdoor weather. When the outdoor temperature is low, it is more difficult for the air conditioner to absorb heat from the outdoor air environment, resulting in relatively poor heating effect.

The heating principle of air conditioner is that the low-pressure gas sucked by compressor is compressed into high-temperature and high-pressure gas by compressor, and the high-temperature gas raises the water temperature through heat exchanger, and at the same time, the high-temperature gas will be condensed into liquid.

The liquid evaporates when it enters the evaporator. (When the evaporator evaporates, there must also be a heat transfer medium. According to the different heat transfer media, the model and structure of the machine are also different. Commonly used are air cooling and ground source. After the liquid passes through the evaporator, it becomes low-pressure and low-temperature gas, and the low-temperature gas is sucked by the compressor again for compression.

In this way, the circulating water on the air conditioning side will become hot water of about 45-55 degrees. The hot water is sent to the room that needs heating through the pipeline, and the room is equipped with a fan coil unit, so that the hot water can exchange heat with the air to achieve the purpose of heating.

Extended data

Judging heating effect and matters needing attention in use

Inspection standard for refrigeration and heating of air conditioner: After the air conditioner starts 15-20 minutes, measure the temperature at a distance of 10-20 mm from the indoor air inlet and outlet. The temperature difference between the air inlet and outlet is not less than 10℃ when cooling, and not less than 15℃ when heating (heat pump air conditioning). There is an air inlet and outlet with electric auxiliary heating.

When the air conditioner heats in winter, the air conditioner absorbs the heat of the outdoor air through the heat exchanger of the outdoor unit, and then transfers the heat to the room through the heat exchanger of the indoor unit. Meanwhile, when heating, the outdoor heat exchanger is used as an evaporator. When the outdoor temperature is lower than -5 degrees, the temperature difference of heat exchange between condenser and outdoor air will be close to 0.

Therefore, there is no heat exchange effect, which leads to poor thermal effect of the air conditioning system and even no heating. Therefore, it is necessary to turn on the auxiliary electric heating function of the air conditioner or adopt other heating equipment.

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