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Operating Mode and Control Strategy of Thermostat Dehumidifier(2)

Views:169     Author:Site Editor     Publish Time: 2020-06-20      Origin:Site


Dehumidifier can be divided into commercial dehumidifier and industrial dehumidifier and industrial dehumidifier fall into two categories, industrial cool dehumidifier and industrial warm dehumidifier. Besides, you can choose different kind of dehumidifiers according to different occasions. If you want to breathe fresh air at office, there is industrial humidifier for office for you and if you work in the basement, there is industrial humidifier for basement for you. If you are in constant movement, you can choose a portable dehumidifier and better, a mini portable dehumidifier.


The previous article has introduced the working principle and application of temperature dehumidifier. This article will introduce operating mode and control strategy of thermostat dehumidifier.

 


Cooling and Dehumidifying 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 dehumidifying mode. At this time, the four-way valve is not energized, and the system operates in cooling mode. The branch circuit of the second indoor heat ex-changer is closed by a solenoid valve. The outdoor heat ex-changer is a condenser, and the first indoor heat ex-changer is an evaporator. The indoor air is only cooled and dehumidified by the first indoor heat ex-changer, and the low-temperature and low-humidity air returns to the room. In this mode, the air volume or water volume of the outdoor heat ex-changer 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 ex-changer.

 

dehumidifier

 

Temperature 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 adjustment and dehumidification mode. At this time, the four-way valve is not energized, and the system still operates in cooling mode. The outdoor heat ex-changer and the indoor second heat ex-changer are two parallel condensers, and the indoor first heat ex-changer is an evaporator. After the indoor air is cooled and dehumidified by the first indoor heat ex-changer, after passing through the second indoor heat ex-changer, it is reheated by partial condensation heat, and the air returns to the indoor. In this mode, the air volume and water volume of the outdoor heat ex-changer can also be adjusted to adjust the distribution of the heat exchange volume of the two condensers to further control the indoor reheat, thereby achieving the purpose of controlling the indoor air temperature.

 

 

Heating 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 dehumidification mode. At this time, the four-way valve is not energized, and the system operates in cooling mode. The outdoor heat ex-changer branch is closed by the solenoid valve. The indoor second heat ex-changer is a condenser, and the indoor first heat ex-changer is an evaporator. Since high-temperature refrigerant also flows through the indoor second heat ex-changer, after the indoor air is cooled and dehumidified by the indoor first heat ex-changer, all the condensation heat passing through the indoor second heat ex-changer is used to reheat the air. In this mode, since the refrigerant flow path of the outdoor heat ex-changer is closed, all the heat of condensation is borne by the second indoor heat ex-changer. The heat of condensation in the system is greater than the heat of evaporation, so the humidity of the processed air drops and the temperature rises.

 

dehumidifier 


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. So it is more difficult to get out the moisture in the air. However, when the air is heated, the relative humidity of the air drops rapidly when the moisture content is unchanged. Therefore, it is possible to control the indoor temperature and humidity through the heating operation of the system. At this time, the four-way valve is energized, the system operates in heating mode, and the indoor second heat ex-changer is shut off by the solenoid valve. The outdoor heat ex-changer is a force evaporator, and the first indoor heat ex-changer is a condenser. In this mode, the indoor air is heated by the first indoor heat ex-changer, and then returns to the room after passing through the second indoor heat ex-changer without heat exchange. In this way, the temperature of the air increases and the humidity decreases, thereby realizing the control of the indoor temperature and humidity.

 

 

Automatic Defrost

When the system is operating in mode, the first indoor heat ex-changer is an evaporator. When the surface temperature of the evaporator is lower than 0 degrees Celsius, when the relative humidity of the air entering the evaporator is high, the moisture in the air may frost on the outer surface of the evaporator. When the frost reaches a certain thickness, the pressure loss on the air side increases, the air flow decreases, and the heat exchange effect is poor, and defrosting is required. At this time, the unit is operated in heating and humidity control mode. The first indoor heat ex-changer acts as a condenser, and the entry of the high-temperature refrigerant causes the frost to quickly melt and restore the original operating mode. When the system is operating in heating mode, the outdoor heat ex-changer is an evaporator. When the outdoor air temperature is low, the humidity is high, and the evaporator surface temperature is below 0 degrees Celsius, the outer surface of the outdoor heat ex-changer may also frost. When the frost reaches a certain thickness, the unit is operated in the dehumidification mode. The outdoor heat ex-changer acts as a condenser, and the entry of high-temperature refrigerant causes the frost to quickly melt. The indoor second heat ex-changer also acts as a condenser, preventing air cooled by the indoor first heat ex-changer from directly entering the room. When the frost is completely removed, the heating and temperature adjustment mode is restored.

 

Hope the above description helps you understand the operation mode and control strategy of the constant temperature dehumidifier, so that you have a better choice when buying a constant temperature dehumidifier.


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