Preair Commercial Dehumidifier Ducted

The working mode of ducted dehumidifiers

1. Cooling and dehumidification mode
When the indoor temperature and humidity are relatively high and the indoor cooling load is relatively large, the system operates in the cooling and dehumidification mode. At this time, the four-way valve is not charged, and the system operates in refrigeration mode. The branch of the second indoor heat exchanger is the solenoid valve off, the outdoor heat exchanger is a condenser, and the first indoor heat exchanger is the evaporator. The indoor air is only cooled and dehumidified by the first indoor heat exchanger and returns to the room as low-temperature and low-humidity air. In this mode, the air volume or water volume of the outdoor heat exchanger can also be adjusted to further adjust the cooling capacity and dehumidification capacity. The cooling capacity and dehumidification capacity both increase with the increase of the air volume or water volume of the outdoor heat exchanger.
2. Temperature regulation and dehumidification mode
When the indoor humidity and humidity load are relatively high, and the indoor cooling load is relatively small, the system operates in the temperature regulation and dehumidification mode. At this time, the four-way valve is not charged, and the system still operates in refrigeration mode. The outdoor heat exchanger and the indoor second heat exchanger are two parallel condensers, and the indoor first heat exchanger is the evaporator. After the indoor air is cooled and dehumidified by the first indoor heat exchanger, it passes through the second indoor heat exchanger and is reheated by some condensation heat, and then the air returns to the room. In this mode, the air volume and water volume of the outdoor heat exchanger can also be adjusted to adjust the heat transfer distribution of the two condensers, further controlling the indoor reheat, so as to achieve the purpose of controlling the indoor air temperature.
3. Heating and dehumidification mode
When the indoor humidity and humidity load are relatively high, but the indoor temperature is low and the heat load is relatively small, the system operates in the heating and dehumidification mode. At this time, the four-way valve is not charged, and the system operates in refrigeration mode. The branch of the outdoor heat exchanger is turned off by the solenoid valve. The indoor second heat exchanger is the condenser, and the indoor first heat exchanger is the evaporator. As there is also high-temperature refrigerant flowing through the second indoor heat exchanger 2, the indoor air is cooled and dehumidified by the first indoor heat exchanger, and all the condensation heat passing through the second indoor heat exchanger is used to reheat the air. In this mode, because the refrigerant flow path of the outdoor heat exchanger is turned off, all the condensation heat is borne by the indoor second heat exchanger, and the system condensation heat is greater than the evaporation heat, so the humidity of the treated air drops and the temperature rises.
4. Heating mode
When the indoor temperature is very low and the heat load is relatively large, although the relative humidity is relatively high, the moisture content is relatively low, and it is difficult to get out the moisture in the air. However, after the air is heated, the relative humidity of the air drops rapidly with the moisture content unchanged. Therefore, the indoor temperature and humidity can be controlled through the system heating operation. At this time, the four-way valve is energized, and the system operates in heating mode. The indoor second heat exchanger is turned off by the solenoid valve. The outdoor heat exchanger is the evaporator, and the indoor first heat exchanger is the condenser. In this mode, after being heated by the first indoor heat exchanger, the indoor air returns to the room after passing through the second indoor heat exchanger without heat exchange. In this way, the temperature of the air rises and the humidity drops, thus realizing the control of indoor temperature and humidity.

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