Help with design

Mason

Can anyone help me with a design for dehumidification so that I can run a "cool" slab??

Thanks in Advance
Mason


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Mason

This particular project is a 30x30 4" thick garage floor. The owner is a serious $$$ car restorer. I was trying to get him the cooling he wants for his work area without any moving air.

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Constantin

If it's an option,

... consider the ceiling radiant systems made by Karo. You'll still need to remove the latent heat, but a combination of a cool slab and an even cooler ceiling should remove most of the sensible heat.

My biggest fear is the quality of the doors. Most garage doors I've seen leak like sieves, so condensation may become a real issue on a hot muggy day.

Brent_2

air

why is moving air such a concern. I could see that he would want to minimize the air flow but I don't know why he doesn't want any air flow. You will need some airflow in order for a dehumidification system to work. Also, a radiant system is typically slow recovery. When he opens a garage door to drive out you are basically allowing all the cool dehumidified air to escape.

brent

GMcD

Catch 22

You can't dehumidify air without moving some air. There are some options: a standalone dehumidifier that just recirculates room air and squeezes the moisture out from a small refrigeration unit, or an air to air dessicant heat/energy recovery unit that provides some dehumidification, and if the supply air rate is set up to be 10% more than the exhaust air rate, you can maintain positive pressure in the space, but you may still need additional dehumidification with a standalone unit to help on the peak design days.

For radiant cooling, the design basis is to keep the room air dewpoint to about 2F under your radiant surface design (or conversely, keep your radiant cooling surface 2F above the ambient air dewpoint). Typical radiant cooling surface temps are in the 62F to 65F range, therefore the ambient air should have a maximum dewpoint of 59F-60F, and according to my handy psych chart, an ambient air temperature of 74F with a dewpoint (NOT wet bulb!) of 60F is about 55% RH. I personally aim for a 50% RH max at 74F ambient as a design point.

Steve Ebels_3

Dave the Rave!

Go to good old Google and type in dessicant wheel. As usual, all sorts of stuff pops up but some of it is what you are looking for.