Custom Made Dehumidifier Vs AC

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Offline akashray

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Custom Made Dehumidifier Vs AC
« on: 16/02/2014 14:00:36 »
      I am planning to create a school project about the use of dehumidifiers instead of ACs to decrease energy consumption.Now,decreasing humidity actually makes higher temperatures much more tolerable.

Check out to know more about this.

Now,conventional dehumidifiers work in pretty much the same way as AC s do.So,what if I use silica gel or clay absorber as the moisture absorbing substance and use it to make a dehumidifier.

         Now,will this work especially in Asian countries like India?Can this really keep the apparent temperature at a comfortable zone?


Offline CliffordK

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Re: Custom Made Dehumidifier Vs AC
« Reply #1 on: 16/02/2014 22:20:42 »
It might work.  You'd have to drive the moisture out of the silica gel which you could accomplish in 1 of 2 methods, heating, or lowering the pressure. 

I could imagine using some kind of a solar cooker to cook your silica, perhaps with one batch cooking while the other one was drying the air.

You would likely need a fan to circulate the air through your desiccant. 

Clay may be dusty.


Offline alancalverd

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Re: Custom Made Dehumidifier Vs AC
« Reply #2 on: 17/02/2014 08:57:54 »
It's worth considering the original Electrolux refrigerator principle, using solar heat to drive a closed cycle system with no mechanical parts.

Whatever you use, you still need to circulate the air through your dehumidifier, and in the case of a gel or powder desiccant it's a good idea to rake it from time to time to expose new dry material.

It's definitely worth doing some calculations in advance. Air weighs about 1 gram/liter so there's about 20 kg of air in a small room. It becomes unpleasant if there is around 10% water in the air, so you need to extract about a liter of liquid water from a bedroom or office to make it worthwhile. Now consider how many air changes per hour are needed to keep the place smelling fresh - up to 5 changes per hour if it is "just comfortably" occupied (like an aeroplane or a classroom). And add the amount of water exhaled or perspired by the occupants: maybe 0.1 - 0.2 liter/hour per person. It's quite a task for a passive absorber, so you need to maximise the exposed surface area.
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