dowtchaboy Registered User
#1

There's a handy midi-sized dehumidifier on sale at ALDI on 23rd Dec. for €39.99

The dehumidifier extracts 400ml per day and has a 1.5L capacity tank which switches off when full.

Compressor uses thermoelectric Peltier module
Product dimensions: 34 x 20.5 x 13cm

As it is Peltier effect (like those 12v cool-boxes it will be silent (I think - though there might be a small fan.....) - AFAIK these are not as efficient as normal dehumidifiers on the other hand they may be less likely to go wrong, are quieter (you could use them while asleep perhaps, if on-site) and a side benefit of dehumidifiers is the provide a little bit of heat (more efficiently than heaters - dehumidifiers are heat-pumps!).

I wouldn't be at all surprised if these units are 12V with a mains adaptor - it doesn't say this though.

I used a dehumidifier in my van a lot as I was sleeping in it 4 days a week last Winter while in College. It is stunning to realise how much perspiration we give off each night! (and that's just me on my own !)

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#2

Definitely worth having a dehumidifier for the van. Nice find.

It will not provide heat however as the peltier is heating and cooling the same body of air the nett heat product is effectively zero. In order to provide heat it would need to have the condensing side outside the van and the heatsink inside the van thus dehumidifying mother nature.

dowtchaboy Registered User
#3

Hmmm.... yes you are quite right about the "heatpump" aspect - since it is not taking heat from the air outside the van, and is, as you point out, heating and cooling the same volume of air - my bad!

If I want to be picky, though, if you consider the unit as a black box, it is going to consume whatever electrical energy is delivered to it over the power cable (maybe 20 Watts or so?) and thus will produce a nett heat gain exactly the same as any other 20 W electrical item so dehumidifiers do 2 jobs - remove moisture and add a little heat, though probably not enough to ward off freezing!

corkbuoy Registered User
#4

Seems these are only usable above 15 deg C and only usful for very small areas - see here http://www.meaco.com/guide.html

dowtchaboy Registered User
#5

corkbuoy said:
Seems these are only usable above 15 deg C and only usful for very small areas - see here http://www.meaco.com/guide.html


Hmm.. that's worrying:
A peltier dehumidifier basically uses a cold metal surface to condensate the air on. These should not be used below 15°C and will not control much more than a large wardrobe.


I was hoping they were more like the dessicant ones they use in keeping boats dry - those work down to near zero.

At 15 degrees - that's really not much use for say overnight use - outside in Ireland will always be less than 15 degrees....
Think I'll give this a miss - have to watch for some good deals on a 'normal' one from B&Q or Argos in the New Year.

If I had the dosh I'd probably go for the Meaco one for €199 at CH marine (and other places I guess):
Meaco DD122FW Portable Dehumifier Ref: 44000
The most popular portable dehumidifier on the market - Awarded 'Best on test ' by Practicle Boat Owner in Dec'09 and it has received an average rating of 9/10 based on over 370 reviews.

Use for boats,caravans, garages and domestic applications

- Desiccant adsorption technology - works at low temperatures
- Removes a constant 7 litres/day regardless of temperature
- Suitable for use in all unmanned and unheated applications
- Fully automatic humidity control stat for economy
- Tank or drainage option - Hose is supplied
- Nano-Silver filter kills bacteria on contact, makes the air healthier
- Laundry feature for domestic clothes drying
- Compact, lightweight,
- Low noise
- Auto restart in the event of power failure
- Voltage 220v

#6

The 15 celcius limitation is common to compressor dehumidifiers too due to icing, you'd need to spend a lot for a defrosting one. Theoretically I suppose you could reverse polarity the peltier for a short period to defrost it.

Bob Z Registered User
#7

so what happens if you use it under 15c?

cir287 Registered User
#8

Bob Z said:
so what happens if you use it under 15c?


below about 15' its just completely ineffective, as in it goes through the motions but doesnt dehumidify.

dowtchaboy Registered User
#9

I'm resurrecting a year-old thread just to point out that this ALDI dehumidifier is on sale again on Dec 29th 2011.
However as people have pointed out earlier in this thread it seems that it would NOT be suitable for use in a camper parked outdoors at an ambient temperature of 15 deg or less (i.e anywhere in Ireland in winter).

http://www.aldi.ie/ie/html/offers/special_buys3_19935.htm?WT.mc_id=2011-12-22-18-38

fannywart Registered User
#10

It is 3 years on now. aldi are at it again.
I got one of the MIDI dehumidifiers today.
60/ 65 watrs. not cheap to run for 400 theoretical mls per day.

Niall_G Registered User
#11

It is not suitable for outdoor winter temperatures as I found out..... It freezes over, continues to freeze, and I think then draws substantially more power. It may have been co-incidence that my almost new leisure battery died completely in 2 days of the de-humidifier freezing over, but I wouldn't like to put it to the test again. A tray of crystals for me in future!

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