Question-and-Answer Resource for the Building Energy Modeling Community
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You should be able to find more information regarding the number of node calculation in the Engineering Reference. The following is an excerpt from the engineering reference, please refer to the link above for full context.
The discretization method allows CondFD to assign different node spacing or grid size to different material layers in a wall or roof, as building walls and roofs typically consist of several layers of different materials having different thermal properties.
Δx =√(CαΔt)The actual integer number of nodes for each layer is then calculated by rounding off the result from dividing the length of the material layer by the result of the equation above.
