A novel design of a rotary desiccant system for reduced dehumidification regeneration air temperature

Dominic O'Connor, John Kaiser Calautit, Ben Richard Hughes

Research output: Contribution to journalConference article

Abstract

A novel design of rotary desiccant wheel has been tested experimentally in a two channel duct with countercurrent flow arrangement. Silica gel coated radial blades extending from the centre of the wheel were arranged at equally spaced intervals in 32-blade and 20-blade configurations. The design was focused on reducing the pressure drop across the device, as well as the regeneration temperature required for desorption of the desiccant compared to 80-120°C temperature currently required. It was envisioned that the increased air volume between radial blades would reduce the pressure drop and the regeneration temperature would be lowered due to the use of silica gel beads as compared to powder coating. The maximum pressure drop across the device was measured as 10.31Pa, significantly lower than current dehumidification systems. The regeneration air temperatures were set between 25°C and 40°C, increasing at 5°C increments. The experiments showed that reduction of the relative humidity of the airstream by up to 67% was possible within this range, whilst the silica gel continued to desorb water molecules, even at regeneration temperatures as low as 25°C. Further investigation with various parameter variables and designs will be undertaken to optimise the rotary desiccant wheel for low pressure drop and low regeneration air temperature.

LanguageEnglish
Pages253-258
Number of pages6
JournalEnergy Procedia
Volume142
DOIs
Publication statusPublished - 31 Dec 2017
Event9th International Conference on Applied Energy, ICAE 2017 - Cardiff, United Kingdom
Duration: 21 Aug 201724 Aug 2017

Fingerprint

Pressure drop
Silica gel
Air
Wheels
Temperature
Powder coatings
Ducts
Desorption
Atmospheric humidity
Molecules
Water
Experiments

Keywords

  • dehumidification
  • desiccant material
  • experimental testing
  • rotary wheel

Cite this

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title = "A novel design of a rotary desiccant system for reduced dehumidification regeneration air temperature",
abstract = "A novel design of rotary desiccant wheel has been tested experimentally in a two channel duct with countercurrent flow arrangement. Silica gel coated radial blades extending from the centre of the wheel were arranged at equally spaced intervals in 32-blade and 20-blade configurations. The design was focused on reducing the pressure drop across the device, as well as the regeneration temperature required for desorption of the desiccant compared to 80-120°C temperature currently required. It was envisioned that the increased air volume between radial blades would reduce the pressure drop and the regeneration temperature would be lowered due to the use of silica gel beads as compared to powder coating. The maximum pressure drop across the device was measured as 10.31Pa, significantly lower than current dehumidification systems. The regeneration air temperatures were set between 25°C and 40°C, increasing at 5°C increments. The experiments showed that reduction of the relative humidity of the airstream by up to 67{\%} was possible within this range, whilst the silica gel continued to desorb water molecules, even at regeneration temperatures as low as 25°C. Further investigation with various parameter variables and designs will be undertaken to optimise the rotary desiccant wheel for low pressure drop and low regeneration air temperature.",
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A novel design of a rotary desiccant system for reduced dehumidification regeneration air temperature. / O'Connor, Dominic; Calautit, John Kaiser; Hughes, Ben Richard.

In: Energy Procedia, Vol. 142, 31.12.2017, p. 253-258.

Research output: Contribution to journalConference article

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