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Hey T-Bone ?

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Franz

01-01-2002 12:57:25




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Listened to a discussion last night between a couple fairly intelligent people about water temperature in a hot water baseboard system.
One fellow insisted it was more efficient to run 180 degree water, while the other insisted running 140 degree water in a residential system would do the same job and use less fuel to accomplish the task.
Now I do know the Johnson Control systems vary water temp in commercial systems according to outside temperature and wind conditions, so I seem to believe the guy who was arguing 140 degree water will do the job, given the limited amount of heat reansferr available in baseboard radiation.
Do you know of any sites discussing this?

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Greg S

01-03-2002 14:06:40




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 Re: Hey T-Bone ? in reply to Franz, 01-01-2002 12:57:25  
Franz,
Here is a web site on boiler controls
www.tekmarcontrols.com



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Greg S

01-02-2002 10:26:35




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 Re: Hey T-Bone ? in reply to Franz, 01-01-2002 12:57:25  
Franz,
There are a couple of ways to do this (called outdoor reset). If the boiler is one of the older style cast iron sectional type most manufacturers like them to be at a minimum of 140 deg. I have used a pair of ball valves linked together and controlled by outside air temperature that will bypass the return water to the supply side to maintain the water temp set on the controller. The boiler runs on its own controls and will maintain the 140 0r 180 temp set.

The newer high efficiency boilers are made where condensation of flue gases is not a problem and these boilers can be controlled to provide whatever water temp is needed to do the job of heating.

I live in SE wyoming and typically I designed the outdoor reset schedules to be 140 at 60 outside up to 200 at 0 outside. Ther are a number od manufacturers that make these reset controllers, prices are probably $1000 give or take depending on how exotic you want to go.

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Bill

01-01-2002 18:56:42




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 Re: Hey T-Bone ? in reply to Franz, 01-01-2002 12:57:25  
The heating of a structure in is replacing the heat that is lost to the outside of the structure. When I worked on residentual boilers I would set them at 180 degrees. This was the tempature that they were designed for. During warmer weather 60's to 30's you can run at a lower heat such as 140 degrees. The drawback of this is when the tempature drops the aquastat has to be reset. Most customers are not qualified or want to do this. The last thing we need is the average home owner playing with safety controls on their heating system. The controls that you mentioned for commerical systems certainly help their efficiency. The best ways, for the homeowner to save on heating cost are good windows, insulation and doors.

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Dusty

01-02-2002 05:38:57




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 Re: Re: Hey T-Bone ? in reply to Bill, 01-01-2002 18:56:42  
Some where I've seen an add on control, that had a remonte bulb to sensor, that allowed you to have two water temperature settings, depending outdoor temperature.
Dusty



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T_Bone

01-03-2002 11:36:11




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 Re: Re: Re: Hey T-Bone ? in reply to Dusty, 01-02-2002 05:38:57  
Hi Franz,
Sorry I can't give you a good answer at the present time, health problems won't let me think stright. From what the other posters said sounds about right.

You can buy a control to do anything you wish to do but do you have the money? I agree that a homeowner adjustable system is not advisable but an auto unit would be good.

If you want more info latter when I can, let me know.

T_Bone

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Franz

01-03-2002 18:24:36




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 Re: Re: Re: Re: Hey T-Bone ? in reply to T_Bone, 01-03-2002 11:36:11  
I had one of the double bulb units 25 years ago, and while it was OK, I really didn't fall in love with it.
In my ideal control freak world, I'd have outside sensing of temperature and wind, and connect that up with a bunch of if/then statements in something with the brainpower of a Timex computer to set the boiler temperature.
Things like If outside temperature is rising, and the sun is coming up and there's no wind, then, postpone firing the boiler for x# of minutes and resense heating need. Unfortunately, I can't liberate a Johnson Controls system to use in the house, the people at JC have NO sense of humor.
Right now, average outside temp is 20 degrees, and I'm burning abouty 2 hours a day on the boiler I just put in, running 140 degree water.
It works just fine, but I hate giving the oil company money. He11, I hate giving anybody money.

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