Select the day of the month for the design day. The default day is 15, i.e. the middle of the month.
Depending on the selection at site level for Design temperature period, you can either select a single design month (when it is set to 1-Single design month) or a month range (when it is set to 2-Multiple design months).
When a single month is being used the default design month will be 1 month after mid-summer by default (July in the Northern Hemisphere, January in the Southern Hemisphere). When multiple months are being used the default start month is mid-summer and the end month is 2 months later. This covers most design cases where peak conditions may occur some time after mid summer, especially when there are large amounts of South-facing glazing (in the Northern Hemisphere).
This selection is used to identify the appropriate daily profile within the schedules to use for the Cooling design calculations. The day type should be the day when the most extreme conditions and highest cooling loads are expected. You should normally keep the 9-SummerDesignDay default option, especially when also running simulations. Select the day of week from the options: