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scott 
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Joined: 12 Sep 2009
Location: michigan
Points: 2588
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 Topic: Water temp for heated floor.
Posted: 8 hours 55 minutes ago at 8:02am |
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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.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 22511
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Posted: 8 hours 13 minutes ago 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
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31151
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Posted: 6 hours 17 minutes ago at 10:40am |
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140 was the magic number I was explained as to spalling Concrete or causing cracking.
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plummerscarin
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Joined: 22 Jun 2015
Location: ia
Points: 3486
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Posted: 4 hours 53 minutes ago at 12:04pm |
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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.
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DonBC
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Joined: 12 Sep 2009
Location: Courtenay, BC,
Points: 919
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Posted: 3 hours 57 minutes ago at 1:00pm |
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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.
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tadams(OH)
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Joined: 17 Sep 2009
Location: Jeromesville, O
Points: 10148
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Posted: 2 hours 29 minutes ago at 2:28pm |
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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.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 1 hour 20 minutes ago at 3:37pm |
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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.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
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Posted: 1 hour 5 minutes ago 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
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