Dear Linda,
Thank you for your response. I will definitely look into Mike's recommendation. Although, I think that Node 1 is the outside surface (i.e the surface that is in contact with the outside air) and the number of nodes progressively increases as we go inwards.
Thank you again,
Niraj
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Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.