Winter design weather data

Location tab on model data at Site level

Heating design and simulation autosizing simulations use simplified winter design weather based on a worst case design day.

The weather data used in Heating design calculations is as follows:

• Minimum outside dry-bulb temperature - the winter design outside air temperature.
• Co-incident Wind speed. This data is used to help calculate external convective heat transfer coefficients.

In addition for zone heating load autosizing this additional data is used:

• Coincident Wind direction is used in Calculated natural ventilation autosizing calculations (along with the wind speed above).

The degree of 'confidence' of the design data can be selected, i.e. the probability that the design data will occur in practice based on conditions encountered over recent years. Select either 99.6 or 99% confidence (i.e. 0.4 or 1% chance of more extreme winter weather occurring).