The Basics Of Dehumidifier Systems

As you have been looking over the many different models of dehumidifiers on the market and pouring over dehumidifier reviews, a question may have bubbled up in your mind. “How does a dehumidifier actually work?” If it did, then you are going to love my little article today. That’s because I am going to tell you everything you wanted to know about dehumidifiers but were afraid to ask. That’s right. Today, we are going to cover the basics of how your dehumidifier does what it does.

Before we can discuss the basic operating principles of a dehumidifier however, we need to first see what its main components are. So without further ado, let’s examine what’s underneath that ambiguous plastic case of your dehumidifier:

Basic Dehumidifier Parts

Fan Compressor: This part of the dehumidifier compresses and expands a gas that is very similar to Freon.

Compressor Cooling Coils: This is where the air cools.

Reheater: This collects the heat that is expelled during the cooling process so it can be used to reheat the expelled air.

Reservoir: This collects the condensation from the cooling coils.

How Do These Parts Work Together

Now that we know the actual components of the best dehumidifier, it is time to see how these parts work in concert to wring the moisture out of your air. The process is much simpler than you probably imagined. Here are the actual steps:

  1. A fan moves the air from the surrounding room and pulls it deep inside the dehumidifier.
  2. The air then passes over the compressor cooling coils.
  3. The coils lower the temperature of the air so that the moisture in it is turned from steam into water (a process known as condensation).
  4. The water remains on the coils and gets heavier as more water is added. This in turn causes it to drip into the reservoir of the dehumidifier.
  5. The heat captured by this conversion is released from the reheater back into the air.
  6. The drier air is then expelled from the system.

That are the basic parts of your typical dehumidifier. That explains the whole process as it happens. However, it might not explain everything your dehumidifier does under that plastic case. Most humidifiers have additional features that may make their operation a little more complex.

For instance, most dehumidifiers have a device in them called a humidistat. This is the part of the machine that senses how much humidity is in the air to determine if it should shut off or keep running. A humidistat is composed of two parts. A sensing element and a relay amplifier. These two parts are pretty complex, but here is the basics of how they work. Changes in the amount of moisture in the air passing over the sensing element will cause electrical resistance to form between two metal strips in the sensor. When the resistance is just the right amount, then the relay amplifier will then activate and either turn the unit on or turn it off. And that is truly everything you need to know about your dehumidifier.


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