humidity

I live in SC and the humidity on my C24 was 74% so I turned on my Webasto to dry for 3 hrs and the humidity increased.
I would appreciate any thoughts.

Do you know how the temperature changed over that time?

It was about 65 and no change in temperature.

What you are measuring is relative humidity at a given temperature. All constants being equal, an increase in temp would decrease the relative humidity because you are not adding or removing moisture from the air. In the end you still have the same amount of moisture in the boat. At a higher temp the air can hold more moisture so RH will be lower.

A dehumidifier will extract water from the air similar to an air conditioner with the difference being the air conditioner dumps the hot air outside instead of back in the room. Adding heat doesn’t actually dehumidify, it just feels less humid.

That said, don’t get why it’s higher. Not sure how the Webster heaters work but I don’t think it’s like propane that expels moisture in the air as part of the combustion process.


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What I have done on my boat for 10 years is use Kanberra Gel all the time. https://kanberragel.com/. When the boat is laid up for a few months I use the large Damp Rid buckets and chage them out once per month. I have never had any mold accumulation and the boat always smells fresh. My theory is in our wet climates trying to mechanically remove moisture is near impossible. So rather than fight it I do my best to work with it. The Kanberra isn't cheap, but I swear by it. They also make an aerosol spray.

Thanks Knotflying..... I checked out all the reviews and ordered some gel.

neil":2tot65ep said:

Thanks Knotflying..... I checked out all the reviews and ordered some gel.

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What Knotflying is a good solution. A supplemental option is a non-condenser style dehumidifier such as the Pro Breeze models. They can run in temperatures below 60 degrees which standard dehumidifiers are not designed to do. Note that they are rated by cubic feet vs. square feet which makes them look much more powerful than they really are. I leave mine on 24/7 and during the months when it's too cold to run a standard dehumidifier.

Franco

Relative-Humidity. Definition: The sweat running down your brother-in-law's brow when he sees the game worden/law enforcement standing at the boat dock!
Enough of Bob's silliness I have to get back out side and finish shoveling snow!

Alpina":1hok3uf7 said:

neil":1hok3uf7 said:

Thanks Knotflying..... I checked out all the reviews and ordered some gel.

Click to expand...

What Knotflying is a good solution. A supplemental option is a non-condenser style dehumidifier such as the Pro Breeze models. They can run in temperatures below 60 degrees which standard dehumidifiers are not designed to do. Note that they are rated by cubic feet vs. square feet which makes them look much more powerful than they really are. I leave mine on 24/7 and during the months when it's too cold to run a standard dehumidifier.

Franco

Click to expand...

I actually switched the other way. In the summer I leave the Pro Breeze running and it's quite effective for small quantity water removal. The temperature doesn't really fall below 15 deg C which is the real lower limit for a Peltier dehumidifier. The compressor types also get less efficient below 15 deg. and won't work below 5 deg. C but that gap between 5 and 15 deg. keeps me in a good range since the airflow and capacity are much higher. If you're interested there is an excellent explanation and comparison at https://probreeze.com/us/13-step-guide- ... umidifier/ .

So between the dehumidifier Pro Breeze and Kranberra gel which I ordered both I thank you both and should have a very manageable humidity level since it’s been raining here for a long time with no relieve in sight. Now I know how it feels to live in Seattle.

Monitoring humidity, which you may be doing now, let's you know what you are actually dealing with. I got into it when I was transferred to Calgary, Canada for a few years and had two manage a couple furnaces with humidifiers. Taking measurements lets you know a lot better than hearing how people 'feel'. I run a couple http://www.extech.com/products/445815 dew point/temperature monitors on the boat.