Surface properties tab on Constructions Dialog.
Data on this tab allows the inside and outside surface convection properties of the construction to be set to fixed values. This may be useful where specific known convection properties are to be used or for validation exercises where DesignBuilder outputs are to be compared with those for other software in which particular convection coefficients have been used.
In most cases you should leave the check boxes on this tab unchecked.
Note: The values entered here do not affect the heat transfer coefficients reported on the Calculated tab.
To fix the outside convection heat transfer coefficient for all surfaces using this construction, check the Fix convective heat transfer coefficient check box under the Outside Surface header and enter the coefficient. Likewise for inside properties.
Note that if the SimpleCombined Outside convection option has been selected at building level on the Constructions tab under Surface Convection or on the Calculation options or Model options dialogs the outside convective heat transfer coefficients set will actually be used as a combined convective plus radiation coefficient.