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Desiccant assisted AC

It's ductless, and it removes humidify.
  [vote for,

Think of this as a kind of ductless centralized air conditioning.

Start with a conventional[*] heat pump... but instead of moving heat to and from air, it moves heat to and from streams of liquid desiccant.

Circulate liquid desiccant from the heat absorbing side of the heat pump, through insulated pipes, to air handlers in each room of the house. (The pipe insulation isn't to improve energy efficiency -- it's to prevent condensation on the pipes, which could do structural damage to the house).

Each room air handler exposes the liquid directly to the air, so that the liquid can absorb both heat and water.

Additionally, circulate a seperate loop of liquid desiccant between the heat expelling side of the heat pump, and an air handler outside the house. This exterior air handler, like the inside air handlers, also exposes the liquid to the air. However, it's task is to expel both heat and moisture into the atmosphere.

Whenever the desiccant on the interior loop becomes excessively dilute, a pair of pumps sends liquid desiccant from each loop to the opposite loop, passing it through a counter current heat exchanger on the way.

If the exterior liquid desiccant loop becomes excessivly concentrated, water can be added to it.

goldbb, Jun 15 2009


       // water can be added to it //   

       Not if you use concentrated sulphuric acid. It's a superb dessicant, but you wouldn't want to go adding water to it .....
8th of 7, Jun 15 2009

       Nor if it is made of Francium but there you go..
gnomethang, Jun 15 2009

       Given Francium's half life, your system would need continuous replenishment. But it would certainly have an affinity for water ....   

       What about the liberated Hydrogen ?   

       Dehumidification by electrolysis ?
8th of 7, Jun 15 2009

       I was thinking of using a solution of calcium chloride in water, as the desiccant.
goldbb, Jun 18 2009

       If you add water to make the solution don't you defeat the purpose of adsorption of the humidity?
dentworth, Jun 18 2009

       I'm waiting for the working model. "desiccant" covers a wide range of compounds and chemicals but I can't think of a single one that would reliably do this job.
WcW, Jun 19 2009

       An ordinary AC dehumidifies by condensing water on the coils, as the coils are well below the final air temp. Desiccant cooling systems (and adsorption chillers) are baked, and lithium salts such as lithium chloride and bromide are efficient desiccants.
ldischler, Jun 19 2009

       yes, however when used in exposed evaporation strong salt solutions tend to form large insoluble crystals. The description of the system involves exposing them to ambient conditions then exposing them to a dehydrating condition which are both likely to induce crystallization. Can we be specific about which salt at what concentration we intend to use?
WcW, Jun 19 2009


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