Technical support

Frequently Asked Questions

Here we have summarized the most frequently asked questions from our customers.  If you don´t find the answer below do not hesitate to take contact with Proflute.

What is the procedure to clean a desiccant rotor?

Proflute recommended procedure to clean a desiccant rotor should be prioritized as described below.

1. Use a cleaning brush and/or a vacuum cleaner and carefully remove dust and dirt from rotor surface and flute-channels.

2. Washing desiccant rotor is only to be considered as a last resort and should not be a normal maintenance routine. This procedure is more in detailed described in “Rotor specifications and maintenance instructions” page 17. Instruction is located in Document section.

Recommended operation parameters for Proflute desiccant media?

Operation parameters is depending on type of application, industry and target value for process airflow. Below we list some important parameters to optimize result when using desiccant rotor technology.

• Even air distribution over rotor surface on both process and reactivation side.

• As low pressure difference as possible between airflows to avoid leakage from wet air to dry air and depends on seal system in dehumidifier unit.

• Proflute recommend not to exceed 1000 Pa in pressure drop over the rotor to avoid system leakage.

• ΔT for process inlet and reactivation inlet should be as high as possible for optimized drying result.

• Maximum temperature for reactivation airflow is 160 °C for PPS, PPX, PPP & 60 °C for PPC media.

• Filters are recommended for both before and after rotor to prevent air pollution, see question “Harmful substances for desiccant rotor” for more details.

Maintenance of desiccant rotor?

Regular maintenance is important to maintain high capacity and long operational lifetime of desiccant rotor.

The rotor must be protected with filters for both process and reactivation airflows. Minimum filter class EU3/EU5.

2-3 months after commissioning the rotor face need inspection to see if any media shrinkage and if rotor segments have compressed. Rotors with diameter >1220 mm can be tightened if needed. Proflute supply instructions how to tighten the desiccant rotor.

Yearly maintenance:
• Inspect filters for dirt and damage and change if necessary, dirty filters will over time effect the capacity of desiccant rotor. Note that filter may be more frequently changed depending on the air quality.

• Clean rotor face if it´s dirty and flute channels clogged. See question in this section how to clean desiccant rotor.

• Inspect rotor face if media have shrinkage and rotor segments compressed. Tightening desiccant rotor if necessary.

Critical points to take under consideration for passive dehumidification?

Under construction.

Proflute desiccant rotors in food applications?

Proflute desiccant rotors are widely used in food applications globally.

Proflute recommend a stainless steel (EN 1.4301) rotor frame and FDA-approved silicone glue.

General questions about rotor environment

*Substances with high pH is direct harmful for silica gel media, for example ammonium and NaOH.
Comment: Consult with Proflute if any questions about specific substances.

*Dust particles clogging channels decrease performance capacity and increase pressure drop.
*Organic particles accumulated in the rotor is a direct fire hazard in combination with high regeneration temperature.
*Gases with high boiling temperature organics is hard to regenerate out of the media.
Comment: Take great care when choosing filters.

*Is the desiccant rotor operational with saturated airflow (100 % RH)?
Comment: Yes. Liquid water is harmful for the media and it must be separated from the airflow if, for example, a pre-cooler is installed.