Shops, Barns, Varmints, and Trucks - Water temp for heated floor.

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Water temp for heated floor.

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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=204358
Printed Date: 30 Nov 2024 at 6:36pm
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Topic: Water temp for heated floor.

Posted By: scott
Subject: Water temp for heated floor.
Date Posted: 30 Nov 2024 at 8:02am

I have two connected pole barns that share a Navia on demand water heater. One building has an overhead box heater with radiator, fan, and louvers. The other building has tubes in the cement radiant heat.
The floor heat is off. The overhead box has been keeping both shops warm with 150 degree water. Last night it was colder and the OH box didn’t keep up.
What is my more efficient option? I can raise the water temp to the OH box (180?) or drop the water temp so I can run both heaters as the floor can only take 120 or so.

Replies:

Posted By: jaybmiller
Date Posted: 30 Nov 2024 at 8:44am

heat the floor.

hot water heats concrete, huge 'thermal mass' and warm air rises.

it'd be interesting to know what the temp leaving the overhead is.

say 150 going in and 120 coming out.... you could plumb to go IN the floor......

even if 80, I'd still try it......

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: DMiller
Date Posted: 30 Nov 2024 at 10:40am

140 was the magic number I was explained as to spalling Concrete or causing cracking.

Posted By: plummerscarin
Date Posted: 30 Nov 2024 at 12:04pm

Were it me, I'd heat the floor. I don't fully understand your set up. Two buildings, connected. A wall separates the 2? No wall? Two heating methods. The floor system operates at a lower temperature but this is a set it forget it method. The overhead blower can operate off a programmable thermostat because it can raise and lower room temperature more quickly. My solution is a mixing valve on the radiant with water and thermostat at a lower temp. Operate the boiler at a higher temperature and a separate thermostat to raise and lower room temperature above fixed radiant temperature as desired.

Posted By: DonBC
Date Posted: 30 Nov 2024 at 1:00pm

There are different systems for different purposes. Insulated building with constant use a heated floor works as well as forced air or a furnace. For an uninsulated building and intermittent use it is best to use radiant heat as it heats the objects (you) quickly.

Posted By: tadams(OH)
Date Posted: 30 Nov 2024 at 2:28pm

Heat rises and cold falls, I would keep the floor heated so it doesn't freez the pipes and have fans to circulate the heat from above.

Posted By: steve(ill)
Date Posted: 30 Nov 2024 at 3:37pm

set the boiler at 120 degrees. The floor heat will work great and do 50% of the buildings.. The 120 degree water in the radiator heater for the other building should heat that 50% to an acceptable temp.

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Like them all, but love the "B"s.

Posted By: jaybmiller
Date Posted: 30 Nov 2024 at 3:52pm

hmm. share a Navia on demand water heater.

so WHERE is the thermostat placed ?

when I did remote energy control systems, each building had 'zones'( 1-6 space heaters), with their own thermostats.

In your case, you have two pole barns so two 'zones'...... each should have it's own stat and valving., PLUS the floor... so minimum of 3 zones.

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water