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Posted by HeatPro on May 06, 2008 at 17:45:08:
In Reply to: Re: Is historical usage data better than Manual-J for sizing boilers? posted by dana on May 06, 2008 at 17:00:39:
: I've tried to get the heatpro program to work, seems to keep calling software not actually installed on my machine, but I'll get there eventually...
Yes, the .net program seems difficult without the full .net file updates.
The older IBR HeatPro program does get a bit over for houses over 1000 sq ft; but can give a clue.
The intention was staple-up/extruded plates for lowest-possible operating temps.
That gives the better response; but works better with low water tepperatures and long cycling.
: Decommissioning the forced air (at least for heating) seemed like a good bet
+++ But good for AC or just extreme weather heating.
: In the current configuration the basement stays so warm (~64F) that the floor is ALREADY 62F or higher,
++ Through insulating the full basement, it will still not require much heat down there.
: Even prior to heat-loss modeling it's pretty clear that the structure won't need more than 50,000BTU/hour on design day
++ With a 50,000 btuh load, a high-efficiency water heater is affordable or a T-K3. The difference between 85% and 92% isn't enough to pay some thousands for the extra $130 a year savings.
++ Water heaters like the above have settings to go no higher than 150F.
: I haven't measured the return water temp directly
++ Do measure the supply and return water temperatures in each loop so you know.
: When the smaller radiant floor zone kicks on, the burners cycle 90-120 seconds on, gets up to ~180F, then 20+ minutes off, pretty much as-before.
++ Very fast cycling.
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