Could you tell me in which box on the Glazing Data window in Hevacomp I can enter the glazing g-value? Thanks.
Hi Steve,
The most important point to be aware of is that different parts of the Glazing data menu are used depending on what calculations/simulations you are looking to run.
While a G value is displayed, it cannot actually be changed manually as it is calculated according to the layers of glazing that have been set up, as below. Please note that the layer data is used by Simulations only.
On the other hand if you are looking to run Design Database calculations then the information in the top right corner of the Glazing data menu is used. Your glazing manufacturer will be able to provide you with this data.
A more thorough explanation of the above can be found here.
Shane Regan | Principle Building Performance Support EngineerHevacomp to OpenBuildings - A complete guide for every user | Bentley Communities
Answer Verified By: Shane Regan
Yes that is correct, the Part L calculation will not use the Layer Data. There is no way of entering such a G-value I'm afraid - the data fields that are used by the Part L calculation in Hevacomp are solely determined by the inputs required by SBEM, and this is not one of them.
I would recommend having a look at the Limiting Solar Gains section of the NCM Modelling Guide as offers advice such as how to achieve certain G-Values, example below. Your glazing manufacturer should also be able to provide such information.