Sawmill House

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The Sawmill House

Annual Heat Budget vs Estimated Wind Speed.

The following table presents estimates of the annual heat budget for various wind speeds.

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

          *** Sawmill House
  0.0    9.32    3.89     6.19    11.62     0.79    9.31   41.13   3.61    15.28    25.85     2.27   504.46
  5.0    9.41    3.93     6.24    11.62     0.80    9.39   41.40   3.63    15.28    26.12     2.29   509.70
 10.0    9.62    4.02     6.37    11.62     0.82    9.59   42.03   3.69    15.28    26.75     2.35   522.07
 15.0    9.93    4.15     6.56    11.62     0.85    9.89   42.99   3.77    15.28    27.71     2.43   540.78
          *** 10 percent more auxiliary annual heating needed per year
 20.0   10.34    4.32     6.79    11.62     0.88   10.27   44.22   3.88    15.28    28.94     2.54   564.77
 25.0   10.81    4.52     7.07    11.61     0.92   10.71   45.66   4.01    15.28    30.37     2.66   592.77
          *** 20 percent more auxiliary annual heating needed per year
 30.0   11.33    4.74     7.38    11.61     0.96   11.20   47.23   4.14    15.28    31.95     2.80   623.53
 35.0   11.88    4.97     7.70    11.61     1.01   11.72   48.89   4.29    15.28    33.60     2.95   655.83
          *** 30 percent more auxiliary annual heating needed per year
 40.0   12.44    5.20     8.03    11.61     1.06   12.24   50.57   4.44    15.28    35.29     3.10   688.66
          *** 40 percent more auxiliary annual heating needed per year
 45.0   12.99    5.43     8.36    11.60     1.11   12.76   52.24   4.58    15.28    36.95     3.24   721.18
          *** 50 percent more auxiliary annual heating needed per year
 50.0   13.52    5.65     8.67    11.60     1.15   13.26   53.85   4.72    15.28    38.57     3.38   752.77
 55.0   14.03    5.86     8.97    11.60     1.19   13.74   55.40   4.86    15.28    40.12     3.52   782.98
          *** 60 percent more auxiliary annual heating needed per year
 60.0   14.52    6.07     9.26    11.60     1.24   14.19   56.87   4.99    15.28    41.58     3.65   811.54
 65.0   14.97    6.26     9.53    11.59     1.27   14.62   58.24   5.11    15.28    42.95     3.77   838.29
          *** 70 percent more auxiliary annual heating needed per year
 70.0   15.39    6.43     9.77    11.59     1.31   15.01   59.51   5.22    15.28    44.23     3.88   863.18
 75.0   15.78    6.59    10.00    11.59     1.34   15.38   60.69   5.32    15.28    45.41     3.98   886.20
          *** 80 percent more auxiliary annual heating needed per year
 80.0   16.14    6.74    10.22    11.59     1.37   15.72   61.78   5.42    15.28    46.50     4.08   907.43
 85.0   16.47    6.88    10.41    11.59     1.40   16.03   62.78   5.51    15.28    47.50     4.17   926.94
 90.0   16.77    7.01    10.59    11.58     1.43   16.31   63.70   5.59    15.28    48.41     4.25   944.85
          *** 90 percent more auxiliary annual heating needed per year
 95.0   17.05    7.13    10.75    11.58     1.45   16.57   64.54   5.66    15.28    49.26     4.32   961.27
100.0   17.31    7.23    10.90    11.58     1.47   16.81   65.31   5.73    15.28    50.03     4.39   976.31



Column Headings -

  WSpd   Estimated average annual wind speed, miles/hour
  Walls  Wall 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

Methodology -

The heat loss versus wind speed calculation is based on the following -

A least square quadratic fit was applied to the daily Heating Index values from October 1, 2008 through March 31, 2009 versus estimated wind speed.

The wind speed estimates were derived from daily estimates of whether the day was calm, breesy, or windy. The basis for the speed estimates was sustained wind according to the following Beaufort Scale ratings -


Beaufort        Wind         Description
 Scale          Speed, mph
  00                        Calm
  05           19 - 24      Fresh breeze, Small leaved trees sway
  08           39 - 46      Fresh gale, Twigs break off trees, cars hard to steer

As of September 1, 2009

Copyright ©2002, 2009 E. Stiltner.

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Updated '3-Sep-2009,11:16:02'