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Posted by HeatPro on August 14, 2008 at 11:45:48:
In Reply to: Re: New Boiler posted by John on August 13, 2008 at 22:56:21:
: I took your advice and used the heat loss calc. from Slant/Fin. I got a total heat loss of almost 50,000 BTU/HR. Is this correct? I'm not sure.
++ If you did it right. It is possible that the house was built to 1990 insulation standards which would make the estimate about that. You didn't say what insulation factors you used.
: Just to give some info about my house: 2500sq.ft colonial, 1st floor has 9 ft. ceilings, double hung wood windows, 14 years old, full unfinished basement.
: Some of the values for the heat loss calc were: Infiltration Factor .012, Door and Glass factor .65, the System Design Water Temp was 180 degrees (I think this should have been 120F since that is the temp I have set for the 40 gal. SuperStor hot water tank.)
++ The system design temperature is for the baseboard output. If you design at 120F you'll need twice the baseboard lengths of that at 180F.
: The calc never asked if the boiler makes the hot water for the superstor as well, which of course it does.
: Any advice on the values that I used? Or, the calculation I came up with? I can't believe that the number I came up with does not take into account the SuperStor?
++ Unless you run the water in the Superstore out every hour of every day, you'd have to account for the Superstore; but 50,000 btuh PER DAY to make hot water can be ignored for the boiler as it has all day to make a hot water load.
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