Summer design weather data

Location tab on model data at Site level

You can select the 'confidence' of the design data, i.e. the probability that the design data will be at the very extreme of conditions encountered over recent years. This risk can be specified based on dry or wet-bulb temperatures, for 99.6, 99 and 98% confidence (i.e. 0.4, 1 or 2% chance of more extreme weather occuring).

The weather data used in cooling design calculations:

Maximum outside dry-bulb temperature - the maximum dry bulb air temperature over the day
Minimum outside dry-bulb temperature - the minimum dry bulb air temperature (nighttime)
Wet-bulb temperature at the time of the maximum dry-bulb temperature.

The daily temperature profile used in the cooling design calculations is calculated from the maximum and minimum values using a sinusoidal curve and assuming that the maximum temperature lags maximum solar elevation by 3 hours.