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Old 07-10-2014, 10:25 AM   #1
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Free heat for clothes drying


I have recently read a couple of articles about feeding your electric clothes dryer with pre heated attic air. Seal all vent and gaps on your dryer, Install a 6 inch intake duct which feeds to your attic. I'm sorry I cannot post links yet. Google them and read.

1. clothes dryer expel 100-150 cfm from your home, this air is replaced with outside air that needs to be reconditioned by your hvac.
2. Using attic air to feed dryer will decrease attic temps during those hot summer months. ( I live in south Louisiana)
3. Intake air to dryer is preheated requiring less electricity to dry clothes

I am thinking of trying this and installing a small air conditioner filter at the intake to remove any possible dust or insulation from entering dryer. Any thoughts or ill effects of doing this mod. Send me your thoughts

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Old 07-10-2014, 11:49 AM   #2
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http://www.builditsolar.com/Experime...ticToDryer.htm

http://www.instructables.com/id/Summ...ur-Electric-C/

http://www.johnsavesenergy.com/Cloth...l#.U77EBtEg_IU

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Old 07-10-2014, 12:32 PM   #3
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I have a thought, interesting concept, but what about the smells that accumulate in the attic. I. E. bathroom smells, cooking smells, musty odors, babies room smells, even the cat litter box.

They all get up there, and then vent out the attic venting.

ED
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Old 07-10-2014, 03:22 PM   #4
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I personally don't have anything that smells in the attic. Bathrooms are vented outside.
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Old 07-10-2014, 07:56 PM   #5
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150 CFM won't make a noticeable difference in your attics temp in the summer.
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Old 07-12-2014, 08:56 AM   #6
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Ok, might not cool the attic off. But what about pre-heated air feeding your dryer, and not exhausting your homes conditioned air through the dryer.
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Old 07-12-2014, 09:13 AM   #7
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A bit of a wash.

If your basement air is at 70F and has 70%RH, when its heated to 125F, its RH is now only 13.1%.

If your attic is at 125F, and has 30%RH, it will take a lot longer run time to dry the clothing. So you might want to check the RH in your attic before doing this project.
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Old 07-12-2014, 09:24 AM   #8
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Not sure what you mean by RH. My dryer is in the home. Summer time temp in the home is 76. Attic temps run about 125.
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Old 07-12-2014, 09:26 AM   #9
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RH=Relative Humidity. Which references how much moisture the air can hold based on its temp.
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Old 08-13-2014, 06:28 AM   #10
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Such a nice idea, and must say that we need more supporters of eco and sustainable living in every way!

Thanks for the post, it has inspired many of my own ideas!

All the best!
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Old 08-17-2014, 07:53 PM   #11
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You may be overthinking this.
My parents used an outside clothesline in the summer and a clothesline in the basement in the winter.
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Old 08-18-2014, 02:08 PM   #12
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Quote:
Originally Posted by High Gear View Post
You may be overthinking this.
My parents used an outside clothesline in the summer and a clothesline in the basement in the winter.
Much greener than running a dryer!
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Old 08-18-2014, 02:12 PM   #13
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Lill Daddy, Your hot attic air will be at very high humidity in La. It will take a lot longer to dry your clothes. Might actually take more energy than using the electric. Clothes line outside is the way to say energy.
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Old 08-18-2014, 02:31 PM   #14
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A better method would be a heat exchanger. As the hot air goes out, it heats the incoming air.

One of the problems with drawing air from the attic is restriction. The dryer depends on a low restriction input. Any type of tube up to the attic would need to be pretty large to prevent restriction.

RH is an important factor. As the air temp goes up, the potential RH goes up. Any moisture in the air is more moisture added to the clothes that has to be forced out.

If one really wants to reduce energy usage and be more Eco friendly, the old tried and true method is hard to beat....clothes line. In the winter time, hanging clothes to dry in the house has an added benefit of adding moisture to the air (more RH) and thus raising the 'perceived' temp.

BTW. Electric dryers have to be one of the most enefficient ways to dry clothes. I know some people don't have much of an option (no gas).
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Old 08-18-2014, 11:42 PM   #15
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Sealing the dryer box and running hot air to it will raise the operating temp of the motor that spins the drum.

Motors that run hotter tend to fail sooner than motors that run cooler.
How many years of motor life are you willing to sacrifice ?

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