Desiccant-Humidifier Cycle Refrigeration

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  • A type of Refrigeration Cycle that uses a combination of evaporative cooling (endothermic cool end), and dehumidification via desiccant(s) (exothermic hot end) to pump heat
  • Can be used for Solar Air Conditioning
  • Is also advantageous in it's design, and material simplicity


  • Should the columns be randomly packed, packed, spray, or some hybrid
  • Little info on water evaporation (That User:Eric has found so far )
  • A Whitepaper on CO2 Scrubber Tower Design (this was for co2 scrubbing via ammonia absorption but compared the Spray Towers and Packed Columns)


Dessicant AC Diagram.jpg


  • (Making this to double check myself)
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Evaporative Cooling Column

  • Room Temperature air is pushed in to a counter flow water sprayer column with mesh/bioballs
  • The water evaporates and cools the air (at the cost of increased humidity)
  • It is then sent to the Desiccation Column

Desiccation Column

  • This works in a similar manner as the Evaporative Column, but it has the opposite goal, Desiccation of the Air Stream
  • It does this via a desiccant, most likely a Liquid Desiccant, due to ease of operation
  • Produces Fully Dry Air, and Saturated Desiccant via Liquid Desiccant
  • Make an identical unit to the Evaporative Cooling Column, and replace the water with ?percent concentrated calcium chloride solution
  • Air sent to Humidity Control Column (Optional), Liquid Desiccant sent to Regenerator

Humidity Control Collumn

  • This takes the Fully Dry Air, and brings the humidity up to comfortable levels
  • It can use OTS humidifiers, or be a smaller version of the Evaporative Cooling Column
  • This stage is OPTIONAL

Desiccant Regeneration Module

  • This is a module where the Saturated Liquid Desiccant is Heated to Concentrate it and thus regenerate it.
  • Passive solar is promising, but any heat source will do
  • Also heat exchangers that utilize waste heat from the process for regeneration may improve efficiency further

Industry Standards

Open Source Designs

OSE Design

Internal Links

External Links