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You shoud refer to measurement data. AIVC Technical Note 44 and AIVC Guide 4 both give typical values for n for different building components, and whole buildings (www.aivc.org). A typical value for whole buildings is n=0.66. "n" is dependent on the Reynold's number. A house consists of many leakages of different sizes, each with a different individual "n". The value of "n" for the whole house is thus a weighted average.
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Fra: marco_vanbeek [mailto:marco_vanbeek@...]
Sendt: 9. desember 2004 15:13
Til: comis@yahoogroups.com
Emne: [comis] value for n?
Fra: marco_vanbeek [mailto:marco_vanbeek@...]
Sendt: 9. desember 2004 15:13
Til: comis@yahoogroups.com
Emne: [comis] value for n?
In TRNFlow (COMIS) the following formula is used: q=C*(delta p)^n.
This factor n is depending on the type of airflow. When the airflow
is turbulent the factor n=0,5 en when the airflow is laminar the
factor n=1,0. Now I'm wondering when values for n between 0,5 and 1,0
can be used. The default value in TRNFlow is 0,61 but I don't know
when to use this n=0,61. Is the value for n a function of the
Reynolds number? I hope someone can explain to me how to determine
the value for n.
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