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LONGWELL / Air conditioning technology

An ice-rink desiccant rotor needs one airflow to dry the rink and another to regenerate.

Humid rink air gives moisture to one sector of the rotating desiccant material. A separate heated regeneration stream removes that moisture from another sector, allowing low-dew-point drying to continue while the two paths remain sealed apart.

Representative ice-rink rotary-desiccant process. Leaving dew point, regeneration energy, leakage and fan duty depend on the complete equipment and operating conditions. Open video ↗
01 / Application principle

Follow the airflow through the equipment.

01

Process inlet

The process fan moves moist air through one sector of the desiccant rotor.

02

Moisture capture

The desiccant takes up water vapour and the process air leaves drier.

03

Regeneration inlet

A separate fan moves heated air through another rotor sector.

04

Moisture removal

Regeneration air carries released moisture out while seals keep the circuits separated.

02 / Fan responsibility

What the fan is responsible for

  • Maintain two distinct airflow and pressure paths through the rotor and connected ductwork.
  • Handle the regeneration-side temperature and process-side environmental requirements.
  • Coordinate speed and airflow with rotor, heater, safeties and dew-point control.
Air-path check

Why the route matters

  • Low process airflow can reduce delivery even if the rotor is dry.
  • Insufficient regeneration can leave the rotor unable to continue removing moisture.
  • Seal leakage can mix the streams and change temperature or humidity at the outlets.
03 / Prepare the duty

Define these inputs before choosing a fan

01Process inlet condition, airflow and required leaving humidity or dew point
02Regeneration inlet condition, airflow and temperature range
03Rotor, filter, heater, duct and final pressure losses for each circuit
04Seal leakage, purge arrangement and allowed cross-contamination
05Motor, materials and insulation for each air temperature
06Speed control, airflow proof, heater interlocks, alarms and service access
04 / Product route

A LONGWELL route to evaluate: EC backward-curved centrifugal fan family

LONGWELL EC backward-curved centrifugal fans are a candidate family for ducted air paths, but the process and regeneration circuits require separate selection. Define process airflow and total external static pressure; regeneration airflow, pressure and hot-air temperature; density, humidity and contaminants on each path; plus voltage, control, protection, sound, envelope and current fan curves.

05 / Equipment validation

Verify the complete equipment, not the fan in isolation

Measure both airflow paths and outlet conditions at representative inlet states.
Verify leakage, seal condition, regeneration temperature and heater interlocks.
Confirm fan materials, motor temperature, control range and service access for each side.

Continue with Air conditioning technology.

Send two fan duties: process air and regeneration air.

Share each path's airflow, pressure, temperature and control range so LONGWELL can review the correct fan family for both sides.

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