A dehumidifier is commonly used to decrease moisture and humidity in the air. The dehumidifiers accomplish their work with the help of different types of dehumidifiers. These systems can also achieve their goals by using chemicals which can absorb moisture.
How Does a Dehumidifier Work?
A dehumidifier regulates the humidity in a room by removing the excess moisture from the air and creating a living environment that is inhospitable to dust, mould, moisture, etc.
Steps that a dehumidifier takes during operations:
- Firstly, the air is drawn into the unit by a fan from the room
- Then the air is passed over the cold coils
- Air is cooled, and its moisture condenses
- After this step, the water falls into the drip pan
- Then the air is reheated by a heat recovery system
- And simultaneously, the dry air goes into the room
- Lastly, the dehumidifier will automatically get off after the water is drained.
Types of Dehumidifiers
There are two types of dehumidifiers: Refrigerant dehumidifiers and Desiccant dehumidifiers.
The dehumidifier uses much similar process to a fridge at our home. The refrigeration process generally cools a metal plate, on which the moisture from the air liquidizes. In this process, a fan constantly draws the air through the dehumidifier and even over the cool metal plates. This process liquidates the moisture onto the plate and drips it into the dehumidifier's water tank.
Refrigerant dehumidifiers are commonly effective at room temperatures and decline their performance dramatically in cooler conditions. The common reason for the declaration is ice formation on the metal plates. The dehumidifier can work efficiently at lower temperatures but requires higher-performing components to achieve its goals.
The desiccant dehumidifier is entirely different from the refrigerant dehumidifier. The dehumidifier absorbs water from the air using desiccants, like silica gel. A desiccant is commonly used for absorbing water and is found in small packs in the form of crystals or beads.
In the dehumidifier, a wheel consisting of desiccants turns slowly through the incoming air and absorbs its moisture. During the process, a proportion of the wheel passes through the warm air steam, which reactivates the desiccant by absorbing all the moisture. Then the water is collected in the dehumidifier collection tank. This system tends to be relatively smaller and lighter than refrigerant dehumidifiers. The purpose is to choose dehumidifiers that operate at much lower temperatures, particularly in cool areas like garages, workshops, etc.
The desiccant dehumidifiers generally use silica gel to absorb moisture and humidity. Silica gel makes the dehumidifier more active so that it can absorb more and more moisture and humidity. The silica gel is available in packets, pouches and bulk quantities according to the user's requirements.
Researchers convey that silica gel is a well-known desiccant and even a natural dehumidifier that absorbs moisture by reducing the humidity from the surrounding. Thus, silica gel is an effective desiccant in keeping away mould or mildew from essential products.
Different types of dehumidifiers used in Industrial and Commercial areas:
- Condensate Dehumidifier
- Electric Refrigeration Dehumidifier
- Spray Dehumidifier
- Ionic Membrane Dehumidifier
- Chemical Absorbent Dehumidifier
These dehumidifiers use cold devices to collect water from the air. This water is known as condensate, which is usually greywater. The dehumidifier is often used for industrial purposes.
Electric Refrigeration Dehumidifiers:
It’s very commonly used and draws moist air from a refrigerated evaporator with the help of a fan. The evaporators have a coiled tube, a fin and a tube. The dehumidifier condenses the water, which is being removed, and then the air is reheated by a condenser coil. The preheated air is then released into the room. The dehumidifiers are best at higher ambient temperatures, with high dew points.
In spray dehumidifiers, the cold water to a temperature that is below the atmospheric dewpoint. Due to this, the water condenses into it faster than water evaporates. Therefore, the system mixes cold water and air sprays to capture moisture.
Ionic Membrane Dehumidifiers:
These dehumidifiers use an ionic membrane to remove humidity in or out of a sealed enclosure. These systems mostly use a solid polymer electrolyte membrane (SPE). As a disadvantage, these don't have high dehydration capacities. Dehumidifiers are often used to protect sensitive electrical components, medical equipment, etc., from humidity.
Chemical Absorbent Dehumidifiers:
The absorbent dehumidifiers, also known as desiccant dehumidifiers, use hydrophilic materials like silica gel to dry the air. Silica gel is one of the best practical solutions for absorbing moisture. The process of removing the moisture from the air is the same as the desiccant dehumidifiers. These dehumidifiers can be used in both commercial and industrial applications.
Common features of dehumidifiers:
Frost-control sensor: This sensor turns off the dehumidifier if frost begins to form in the coils. This senses the frost and keeps the application free from racking up your energy bills.
- Clean-filter Alert: The importance of cleaning and maintaining the dehumidifier is to operate it properly. This filter is responsible for cleaning up the air that flows through the system.
- Water tank size: When choosing a dehumidifier, it is very important to look for a water tank with comfortable handles so that you can remove and carry water easily.
- Timer: The timer is generally programmed automatically and switches on and off when the work is done.