![]() 6 on the floor, a little higher than what they will wind up at but I figured with only 35-40% of the heat installed, I'd better run a little warmer water to keep the place heated. I have the basement floor running at 75-78* surface temp and have only 8 out of 22 radiators installed. The system was designed like the first with a max water temp of 140 at design. The second house is the one I had the pics of five Vitodens hanging on the wall.( four of 'em run the driveway) It is now completely insulated and is maintaining 65-70* with no problem. Judging from a rough calculation of floor and rad output at the present water temps the heat load at design has to be in the 55-60,000 btus range. I figured an r value of 21 for the walls, The ceiliing has from 14" (roof/ceiling combination) up to about 20" in the open attics. The insulation package was a little better than normal with blown 2圆 walls, wrapped outside with Low-E foil faced 1/4" foam and 3"x10" half log siding. The rads run luke warm most of the time unless it gets near zero outside. The homeowner loves the fact that he's burned less than 500 gallons of LP since September but his wife is miffed that the floor runs so cool she can't really "feel" the heat. ![]() At this date, the curves we are working with are about 1/2 what I originally figured. I set the both curves on the Vitodens to hit the target temps above at -10*. The floor was figured for a max water temp of 95*. ![]() ![]() The load calc indicated 91,579 btu's at design and I sized the rads to hit the required output at 140* max, keeping the system condensing in all outdoor temps. This house is 5,830 sq ft with lot's of glass to the South, 22' ceiling in the great room and 9' everywhere else including the fully finished basement. House 1 is radiant floor in the basement, Climate Panel in about 70% of the main floor + 3 panel rads and 2 towel bar rads. ![]() Here's a couple of examples of what I'm refering to in the hydronic houses. The forced air systems we put in seem to operate as one would expect when properly sized. I have been using HVAC calc for all my heat loss calculations for the past 4-5 years and have repeatedly found that the hydronically heated homes we do are over radiated. ![]()
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