Sawmill House

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The Sawmill House

Annual Heat Budget vs Wall Insulation.

The following table presents estimates of the annual heat budget for various wall insulation R values -

 WallR  Walls   Wndws    Ceilng   Floor    Doors   Inflt    LSum1  HIndx1   SGain    LSum2   HIndx2   NGals

   5   55.92     3.89     6.19    11.62     0.79     9.31   87.73   7.70    15.28    72.45     6.36  1413.87
  10   27.96     3.89     6.19    11.62     0.79     9.31   59.77   5.24    15.28    44.49     3.90   868.22
  15   18.64     3.89     6.19    11.62     0.79     9.31   50.45   4.43    15.28    35.17     3.09   686.34
          *** 20 percent more auxiliary annual heating needed per year
  20   13.98     3.89     6.19    11.62     0.79     9.31   45.79   4.02    15.28    30.51     2.68   595.40
          *** 10 percent more auxiliary annual heating needed per year
  25   11.18     3.89     6.19    11.62     0.79     9.31   42.99   3.77    15.28    27.71     2.43   540.84
          *** Sawmill House
  30    9.32     3.89     6.19    11.62     0.79     9.31   41.13   3.61    15.28    25.85     2.27   504.46
  35    7.99     3.89     6.19    11.62     0.79     9.31   39.80   3.49    15.28    24.52     2.15   478.48
          *** 10 percent less auxiliary annual heating needed per year
  40    6.99     3.89     6.19    11.62     0.79     9.31   38.80   3.40    15.28    23.52     2.06   458.99
  45    6.21     3.89     6.19    11.62     0.79     9.31   38.02   3.34    15.28    22.74     2.00   443.83
  50    5.59     3.89     6.19    11.62     0.79     9.31   37.40   3.28    15.28    22.12     1.94   431.71
  55    5.08     3.89     6.19    11.62     0.79     9.31   36.89   3.24    15.28    21.61     1.90   421.78
  60    4.66     3.89     6.19    11.62     0.79     9.31   36.47   3.20    15.28    21.19     1.86   413.52
  65    4.30     3.89     6.19    11.62     0.79     9.31   36.11   3.17    15.28    20.83     1.83   406.52
          *** 20 percent less auxiliary annual heating needed per year
  70    3.99     3.89     6.19    11.62     0.79     9.31   35.81   3.14    15.28    20.52     1.80   400.53
  75    3.73     3.89     6.19    11.62     0.79     9.31   35.54   3.12    15.28    20.26     1.78   395.33
  80    3.49     3.89     6.19    11.62     0.79     9.31   35.31   3.10    15.28    20.02     1.76   390.78
  85    3.29     3.89     6.19    11.62     0.79     9.31   35.10   3.08    15.28    19.82     1.74   386.77
  90    3.11     3.89     6.19    11.62     0.79     9.31   34.92   3.06    15.28    19.64     1.72   383.20
  95    2.94     3.89     6.19    11.62     0.79     9.31   34.75   3.05    15.28    19.47     1.71   380.01
 100    2.80     3.89     6.19    11.62     0.79     9.31   34.61   3.04    15.28    19.32     1.70   377.14

Column Headings -

  WallR  Walls Insulation R-value, (F*Hr*Ft**2)/BTU)
  Walls  Walls annual heat loss, MBTU/year
  Wndws  Windows annual heat loss, MBTU/year
  Clng   Ceiling annual heat loss, MBTU/year
  Floor  Floor annual heat loss, MBTU/year
  Doors  Doors annual heat loss, MBTU/year
  Iflt   Infiltration annual heat loss, MBTU/year
  LSum1  Sum of annual (walls ... infiltration) losses, no solar Gain
  HIndx1 Heating Index, BTU/DD/Ft**2, No solar gain
  SGain  Annual solar gain, MBTU/year
  LSum2  Net sum of Heat Losses, including solar gain, MBTU/year
  HIndx2 Heating Index, BTU/DD/Ft**2, with solar gain
  NGals  Estimated Annual propane need, gallons/year, exclusive of domestic hot water

Notes - The wall insulation of the Sawmill House is estimated at 30.00 (F*Hr*Ft**2)/BTU.

As of August 8, 2009

Copyright ©2002, 2009 E. Stiltner.

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Updated '8-Aug-2009,11:50:42'