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Go Back   SailNet Community > Out There > Cruising & Liveaboard Forum > Living Aboard > Dehumidifier in wet/rain PNW?
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Thread: Dehumidifier in wet/rain PNW? Reply to Thread
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Topic Review (Newest First)
01-18-2013 05:12 AM
tap
Re: Dehumidifier in wet/rain PNW?

Has anyone tried a desiccant wheel based dehumidifier? I came across this page about one and it seems like a good fit for my boat, since it works in cold temperatures. I don't live aboard or heat my boat. So in the winter it's going to be 45-35 degrees inside most of the time.

Typically dehumidifiers use a cold plate, cooled by either a peltier element in the tiny 1pt ones and a compressor in the large ones. The air is cooled on the plate and some water condenses out to drip down into the bucket.

If the air is already cold, then the cold plate can't cool it as much and thus is less effective. The cold plate can also ice up. Most compressor dehumidifiers list a minimum operating temperature of 42F for this reason.

A desiccant wheel dehumidifier blows the air through a desiccant, then the desiccant is heated in an area where the water will be captured. They can also work down to just above freezing and continue to work in cold temperatures.

Without a compressor they are also lighter and quieter, but use more power for the heater.

There seems to be a few modules sold in Europe, like the one in the link above, but I can't find them for sale in the US. The only one I can find for sale here is the SPT SD-014V

Compared to the typical 30pt compressor models it's lighter, 18# vs 31# and works down to 33.8 degrees vs 41. But it uses more power and is only rated at 12pt/day instead of 30. Of course it's less than 41 degrees on my boat now so a compressor model would be doing 0 pt.

I can't find any reviews for this thing. Anyone used one? Or another like it? Are their hidden problems, like the desiccant fills with salt and stops working when used on a boat in salt water, or they use way too much power for how much water they can extract?
01-08-2013 12:46 AM
SV Glossa
Re: Dehumidifier in wet/rain PNW?

I just want to clarify, when I (the original poster) mentioned a 'small dehumidifier' I am talking about something like this:
Amazon.com: Eva-dry Electric Petite Dehumidifier: Health & Personal Care Amazon.com: Eva-dry Electric Petite Dehumidifier: Health & Personal Care



And when I (the OP) am talking about a 'large dehumidifier' I am talking about something like this http://www.homedepot.com/Appliances-...1#.UOuk3ndeCpZ

I think I know what you are talking about pdgaltair and Philzy3985 - is it something like this? WEST MARINE Air Dryer with Fan, Dehumidifier at West Marine Because we almost got something like this used off of craigslist but then speaking with the person and looking over the product specifications - it is a little heater IMHO, NOT a dehumidifier.
01-07-2013 09:54 PM
Faster
Re: Dehumidifier in wet/rain PNW?

Quote:
Originally Posted by Philzy3985 View Post
..Guess I feel ripped off then. When I walk into a boat store and ask to see their dehumidifiers and they sell me heaters that suck in air, "dry" it, and blow it out. Shucks. Gift card money poorly used.

I have a couple of the "No Damp" buckets, they get moisture that's for sure. The warning label about it tipping over is a little scary.

There ARE small dehumidifiers.. they use peltier cells to cool a plate, the air is blown across the plate, moisture condenses and 'drier' air exhausts. A small, inefficient refrigeration dryer. If your unit has a reservoir that you need to empty periodically it is a dehumidifier. If it just warms the air then, well, it's not. The reality of course is that warmer air will hold/keep more moisture suspended in it...

We are using a Sears unit with a 20 pint reservoir. It's about 20" tall, weighs about 15 lbs or so.. maybe more. It goes in the car while we're sailing, but lives aboard exc for summer.

One other thing.. ours will restart after a power failure on its own.. some won't.
01-07-2013 09:48 PM
Philzy3985
Re: Dehumidifier in wet/rain PNW?

..Guess I feel ripped off then. When I walk into a boat store and ask to see their dehumidifiers and they sell me heaters that suck in air, "dry" it, and blow it out. Shucks. Gift card money poorly used.

I have a couple of the "No Damp" buckets, they get moisture that's for sure. The warning label about it tipping over is a little scary.
01-07-2013 09:31 PM
pdqaltair
Re: Dehumidifier in wet/rain PNW?

Quote:
Originally Posted by mdi View Post
Seems like you would need multiple units for a boat of any size.
I believe they are 20 pint units. They are small because they have no tank (drain to sink or other). Unless your boat leaks, that should be more than enough for crew contribution and some cooking.
01-07-2013 09:27 PM
pdqaltair
Re: Dehumidifier in wet/rain PNW?

Quote:
Originally Posted by Philzy3985 View Post
... I keep two small electric (west marine brand) dehumidifiers running full time....
I find that calling small heaters dehumidifiers is blatant false advertising. I can't respect that.

From Websters:
Definition of DEHUMIDIFY
: to remove moisture from (as air)

While they reduce relative humidity by changing the temperature, they do not remove any water. They should call them what they are.

You can by an actual small dehumidifier for less.
01-07-2013 08:51 PM
SV Glossa
Re: Dehumidifier in wet/rain PNW?

We are living aboard a 29 ft with 4 people full time ( two are small kids) we have resorted to running a large Sears brand pretty much 24/7. When we go out, then they are turned off because of no shore power. But, if I could run it, I would, because even one night and it is noticeably wetter inside.

Depending on the outside temperature we leave things open during the day. We often have our companion way boards out but the canvas covering over it. Or sometimes if windy/stormy only one board out. We do this to get fresh air, but it is a trade off because we are also running the heater and trying to not loose too much heat.

In the winter we close it up at night to try to keep the heat in and any water out. We do have a solar fan in the V berth and their is space around the boards and the cover, so we are never 'air tight' or anything. But we try to turn off the heater at night, or at least turn it down a bit.

This is in the PNW winter. Other times of year are different.
01-07-2013 07:23 PM
Faster
Re: Dehumidifier in wet/rain PNW?

Quote:
Originally Posted by dsullyec1 View Post
..... Is there a reason for closing up the boat at night? We just planned to leave the ports open if the weather is nice.
No reason not to leave ports open, esp if they're 'rain proof'... When we sailed in the Caribbean we left hatches and ports open for all the usual reasons.. but every night there was at least one 'chinese fire drill' of running about closing things up for a squall, and another one to open up again once it'd passed often only minutes later...
01-07-2013 07:07 PM
dsullyec1
Re: Dehumidifier in wet/rain PNW?

We are going to invest in those little "awnings" that go over the opening window ports...that way we can leave the ports open even when its raining. Is there a reason for closing up the boat at night? We just planned to leave the ports open if the weather is nice.
01-07-2013 06:46 PM
dsullyec1
Re: Dehumidifier in wet/rain PNW?

We are actually in the Galveston area. It's humid, but not as much as PNW, at least I think. I'm really not sure of that. It's just very hot in the summer in the Houston areas, with the humidity, feels like you're in a sauna. I believe we'll be leaving our hatches and windows open at night, except for in bad weather. We do have an AC/heater, so maybe that will help. But as you say, with two of us sleeping and living on board all the time, we may have to turn it on during the colder weather when we can't open the ports and hatches.
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