Advanced Building Simulation

82 Degelman
Generally, the monthly differences have fallen under 0.1�C for dry-bulb temperatures
and under 0.2�C for dew-point temperatures. For the other parameters, the average
monthly difference is 0.9% for wind and around 2% for daily horizontal solar radiation.
Some other efforts at model validation were reported in an ASHRAE symposium
paper (Degelman 1981). That work showed almost a perfect agreement between generated
degree-day data and the actual recorded degree-days (less than 1% difference
in both heating and cooling degree-days, see Figures 3.15–3.17). That analysis
Heating DD (C-days)
350
300
250
200
150
100
50
0
Jan
Actual historical data
Simulated results
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 3.15 Comparison of heating degree-days from simulated versus real weather data.
Cooling DD (C-days)
400
350
300
250
200
160
100
50
0
Jan
Actual historical data
Simulated results
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 3.16 Comparison of cooling degree-days from simulated versus real weather data.