Need to buy one. Needs an electronic humidistat, not mechanical rotary, and need it to switch off when not in use, dont want to waste a packet on the fan running all the time. What I've looked at online seems to be a bit short on info. Any suggestions?
I was knocking up a Raspberry Pi networked humidistat only this afternoon, and I did one for someone's shed a few weeks ago, which switches a heater on and off to keep humidity below a set level.
Going back to that bit in the OP about not wanting to run the fan all the time, the humidistat tends to rely on the fan pulling in air so that it can sample the room's humidity. No fan, no air circulation, no proper humidity control.
We have a Ruby Dry which has an electronic humidistat (see)
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We usually set it for 60% humidity, but you have to select that each time, if you switch off power at the wall rather than on the unit.
nd need it to switch off when not in use, dont want to waste a packet on th e fan running all the time. What I've looked at online seems to be a bit sh ort on info. Any suggestions?
I'm not finding the info I need out there anywhere, and need to get on with it. So have revised the requirement to simply having an adjustable humidis tat and the fan not running continuously. If the stat proves unsatisfactory we can look for an external controller another day.
So does anyone have knowledge of these, whether the fan runs all the time? Or do you have a desiccant type where the fan doesnt keep running?
Ok sorry to butt in on the thread but I am trying to learn - I have never heard of desiccant dehumidifier (other than silica gel usually used in packaging) so I thought I would JFGI. This led me to this page
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which explains the theory. Refrigerant - quite happy with that; I know how that works. Desiccant - OK new to me but the description seems to make sense HOWEVER in the description for desiccant it says
"..... As there is no actual water produced during the process, thes...." and "....The reactivation air leaves the rotor warm and wet. This air is normally exhausted to outside...."
The units linked to above have water tanks (and the facility for a permanent drain) but I can see nothing about exhausting waste air. I am now well confused can anyone point me to a web page explaining the technology behind the devices mentioned above ( I couldn't find anything useful about "how" they worked on the manufactures web site). Thanks
According to meco the vapour is condensed on a metal plate.
"How does the desiccant dehumidifier work?
The desiccant dehumidifiers draw the air in from the room over a filter and into a desiccant wheel that is rotating slowly. The excess moisture in the air is absorbed by the wheel. The wheel is now saturated and as it rotates heat is blown over the wheel to force the moisture out and onto a metal plate where it condenses. Thus the wheel is regenerated so that it can collect more moisture from the air. The heat used is mixed with the dry air and blown back into the room providing dry warm air into the space. Whereas a compressor dehumidifier has to stop dehumidifying to defrost itself the desiccant is able to dry the air
100% of the time. This is why they are more popular in cold applications"
Ah thanks, the metal plate seems to be the key. The web site I looked at said that the moist air was exhausted, rather than passed over a metal plate condenser.
I was about to jump in & ask (I know I've discussed this before, probably with you, but I've slept since then) whether it could be externally switched. Thanks for the precognition!
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