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Old 10-14-2016, 02:40 PM   #1
Skoolie
 
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Question Fluid heating in floor using pex and the former heating system.

As with most buses mine has that water valve that is by drivers foot that sent water to the back heater. My 98 Ford B700 Thomas body has a very large pump up on the firewall to circulate the water.

Has anyone explored the idea of using the engine heat to heat the floor while the engine is running? Add a valve to switch from the engine to another heat source.
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Old 10-14-2016, 03:10 PM   #2
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Yes that is a very versatile solution.
If you have an alternate heat source for your flooring that has its own pump when the bus is not running. If piped correctly your alternate source could be used to warm up the radiator,engine block prior to start up in the winter to help in cold places
Long story short? Yes it is very doable if your alternate heat source for the flooring is running the same ethylene glycol/antifreeze? Most commercial solar water systems use glycol to and from the panel's to heat various things?
Good luck
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Old 10-14-2016, 05:05 PM   #3
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Radiant heat

I love the idea. I've seen it lots in homes. Most systems use it it pipes in cement because the cement transfers and holds the heat well. You wouldn't use cement, for weight. Maybe a passive solar box to heat? My neighbor has one to preheat his water in his house. It's just a back box with a clear lid, conduit running through it. I really like the idea of having an option to circulate through your radiator and block to keep it warm. Diesels can take a long time to get up to temp.
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Old 10-14-2016, 06:10 PM   #4
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My parents Monaco has a diesel hot water circulation system to heat the floors and side compartments. It has real tile floors and real granite counters. Amazing how close they ran it up to the max weight. Id hate for some to get up a vacation day in the Schoolie and have there little toes go into shock from a chilled floor. Maybe some glow plugs in your socks would do a nice preheat.
Actually it works amazing and i diont believe they use any fans to move the air around so the pump is taking about the same load as the forced air would.
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Old 10-14-2016, 06:14 PM   #5
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I have in floor hot water radiant heat. Heat source is engine while running and Espar boiler when not running. There are pictures and some explanations throughout my build and there are some pictures on my web site. Also supplies domestic hot water.

From build site starting about here
http://www.skoolie.net/forums/f11/so...sa-6318-4.html

Some pictures from my web site here. I see I haven't updated lately.
Heat
Diagram here.
Heat 2

Dick
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Old 11-12-2016, 10:09 AM   #6
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I read on a thread about using 3/4' plywood and the a router to use the pex.
What plywood should i use? I am buying at Lowes. What router it should i buy and then what should i put over the 3/4"?
Thanks
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Old 11-12-2016, 02:48 PM   #7
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Quote:
Originally Posted by Versatile View Post
I read on a thread about using 3/4' plywood and the a router to use the pex.
What plywood should i use? I am buying at Lowes. What router it should i buy and then what should i put over the 3/4"?
Thanks
Way simpler way:
Put down your "sub-sub" floor.
Layout your pex tubing to what ever pattern you come up with.
What ever outer diameter pex you use, get the same size in more plywood.
Cut pieces of ply to fill in between all of the pex tubing.
Be sure to use the reflective aluminum in the pex channels you have just created.
No router and bits to buy.
No giant mess and waste of plywood.
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Old 11-12-2016, 03:39 PM   #8
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Or.... instead of plywood between the runs of tubing cut your foam board insulation to fit, taking into account the degree of foam compression from the weight of the top layers of flooring and whatever you plan to put on top of it. Laying the reflective aluminum still applies.
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Old 11-12-2016, 05:20 PM   #9
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Now if we could use that technology in highway bridges... No more ice on bridges!

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Old 11-12-2016, 08:31 PM   #10
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It's much easier to use a router to cut the grooves in the Styrofoam, then lay your plywood on that.
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