How does a desiccant wheel work?

Desiccant dehumidifiers work by using a large desiccant wheel to adsorb moisture from the process air stream. As the process air is dried, the moisture content of the wheel rises. To remove this moisture the wheel is in constant rotation and a second air stream is heated and passed through the wheel.

What is a Dessicant wheel?

A desiccant wheel is a common type of sorption dehumidifier using a solid desiccant. It is also known as a rotary dehumidifier. The desiccant material is coated, impregnated, or formed in place on the supporting rotor structure.

How do Munters work?

The Munters desiccant wheel works on the principle of sorption, which is the adsorption or the absorption process by which a desiccant removes water vapor directly from the air.

How long does a desiccant wheel last?

Desiccant wheels work longer and more efficiently: 100% pure molecular sieve desiccant. Desiccant wheel warranties range up to 5 years. Actual useable life can be up to 15 years.

What are desiccant wheels made of?

The rotor consists of a corrugated fiberglas structure, which contains a hygroscopic material (desiccants such as silica gel or lithium-chloride).

What is a desiccant dehumidifier?

Desiccant dehumidifiers remove water by natural absorption. They use an electrical heater to continuously regenerate the adsorbent material – i.e. they dry the absorbent material out so it can collect moisture again.

When should a desiccant be replaced?

We recommend that a desiccant be replaced once every three years for open-cycle systems and once every two years for closed-cycle systems. A desiccant may degrade more quickly depending on the environment where it is used. Dew point temperatures offer a good indication for when to replace your desiccant.

How do you clean desiccant?

So you can use water containing NaOH, KOH, or another base. The silica will be converted to “water glass”, which is water soluble. You will need several washes with water to completely remove the residue.

Can silica gel be regenerated?

Silica gels can be regenerated heating up to 180°F, whereas molecular sieves can be regenerated by heating them to up to ~550°C, it will release the trapped water. This process is called regenerating the desiccant.

How long do desiccant dehumidifiers last?

You can normally get 4-6 weeks of usage before they would need to be renewed, and most Eva-Dry dehumidifiers last for over ten years. Because desiccant dehumidifiers don’t need to cool the air before drying it out, these types of dehumidifiers are great in colder areas.

Do you need to replace desiccant in dehumidifier?

Since desiccants can be regenerated infinitely through heating within the dehumidifiers, no maintenance or replacement is needed. As desiccant dehumidifiers do not rely on temperature differences to condense moisture from the air, they work all year round, making them highly effective even when the weather is cold.

How do you know if desiccant is bad?

If it never reaches the desired dew point or doesn’t hold it for long, then it’s probably time to change the desiccant. Pull the desiccant beads out and squish them between your fingers. If they are very brittle and crumble upon doing so, they’re bad and need to be replaced.

How often should you replace desiccant?

How do you revive desiccant?

You can do so by pouring the inactive silica gel beads in a thin layer on a baking sheet. You should then preheat the oven to 175 degrees Fahrenheit and bake the beads for 15 minutes. The heat in the oven will draw the moisture out of the desiccant pack, reactivating the drying agent.

How do you reactivate silica gel?

Saturated Silica Gel can be reactivated by placing in an oven at 150°C (300°F) for up to 3 ½ hours or until the blue color is restored, Note: heating above 162°C (325°F) can damage the gel and render it unable to absorb moisture. Gel desiccant can also be reactivated using a microwave oven.

Can dehumidifiers be repaired?

If your dehumidifier doesn’t work right, a simple cleaning of the condenser and moisture-collecting (evaporator) coils may be all that’s necessary to fix it.

Why are dehumidifiers so unreliable?

Although a dehumidifier is designed to remove moisture from the environment, hence dropping moisture levels to an acceptable range, and when left to run further, it can pull down moisture content further to a dangerously low percentage.

Is it good to run a dehumidifier all the time?

Should a Dehumidifier Run Constantly? No, there is no need to keep the dehumidifier running constantly. It’s generally enough to run the unit when the humidity level is 50% or higher. A good rule of thumb to remember is to maintain a comfortable 30-50% humidity level for most homes.

How do you restore a desiccant?

Silica Gel can be restored to its original state by heating it in an oven to 120 °C (248 °F) for 1–2 hours. Once it is restored, it will return to its original color; either orange or blue depending on its type. Silica Gel gets saturated with moisture rather quickly when there is a high level of humidity in the air.

Can desiccant be reactivated?