max. run for my hydro baseboard taco 070?
bsh6979
| Posted in Energy, Heating & Insulation on
i have a single story slabed ranch, oil fuel w/hot water baseboard threw out.. my house mesures 25′ x 55′ if you could imagine one contionus loop around the exterior walls and one toe kick hydro in the kitchen piped with 3/4″ my wells mclain is only 5 years old and is 115,000btyus theres only one zone should i upgrade the circulator? should i split the system? thanks for any info
Replies
Fin tube???
You did say what type of heat emmitters, I assume fintube. And if you have one contunious loop the last set of fintuber must be stone cold. But you also didn't say how it was piped.
Rule of thumb is 75' max on a loop (fintube)
And at that you will see a temp drop coming out of the loop.
Go visit , heatinghelp.com, post you question on the wall, give more info.
Does it work?
Is there a reason to fiddle with it or are you just curious?
You have 1375 sf house heated by a 115MBH boiler?
i checked the boiler and its a 100mbh 115000btus, I had a couple issues with the back two bedroom being very cold. yes its fin tube base board. 1" main that runs from the boiler at one of the house to the other end and then splits back to the boiler in two seprate runs but only one zone. a friend who is a hvac tech suggested removing the T and makeing it one continuos loop but i have doubt about his thereoy, it seem way too long of a loop for the amount of heat drop in the line, i suggested that we might have to split the system. what would be your suggestion? thanks for the info
Zoning and piping
The slab construction makes me wonder about pipe routing and how accessible/changeable it might be.
I would suggest dividing the system into a few zones, definitely not a single loop.
As far as pump sizing goes, for the "standard" 20 deg dT, the total system flow for 100 MBH (btw, 1 MBH = 1000 btu/hr) is 10 gpm. 1" pipe is not big enough for 10 GPM without excessive velocity and pressure drop. The Taco 007 pump may be a little undersized.
Standrad zone control panels are available for 4 zones (plenty for your application) and will control either zone valves or zone pumps. Valves are less expensive than pumps and can be powered by 24VAC. You don't have to use all the zones.
How much piping and wiring are you up for? Do you want to repipe the system for the best control, or just make it work better?
TACO 007
THE LEAST EXPENSIVE SOLUTION WOULD BE TO CHANGE THE 007 TO A 0012 OR 0011. THESE ARE HIGH VELOCITY PUMPS AND WILL MOVE THE WATER AROUND MUCH FASTER THAN A 007. GOOD LUCK
in response...
You really need to know the boiler temp of supply and return to tell whats going on. Would assume the Taco 007 (not 070) is big enough to pump at least 5gpm, which if you are able to maintain a 20deg delta T, (difference between supply and return), the btu's used per hour would be about 50,000 btu/hr... Your house would have to have a real high heat loss, to need that much. I don' think your pump is the problem.
Assuming your supply temp is around 180 degs, your baseboards should be able to put out about 600 btus/lf., but you've never mentioned how much baseboard you have. Say you have 50' total of baseboard, x 600 = 30,000btu/hr max. output.....(based on the info in my imaginary house above. Would think if you have that much baseboard, you would have enough..
...of course you could have baseboard with higher of lower outputs......and possibly a very high heat loss...all this info is needed to say for sure.
And don't listen to the friend who suggests one loop over what is technically 2 loops now. You have a better chance of keeping even temps to all baseboards splitting it two directions.