Periodic Heat Flow in Walls and Roofs

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TypeTechnical Report
Series titleReport, Division of Building Research, National Research Council Canada; Volume 132
Physical description20 p.
SubjectHeat performance
AbstractTwo methods of calculating the periodic heat flow through solid walls of roofs are described. The matrix method gives the accurate value of heat flow through a solid wall whether homogeneous or multilayer. One of the advantages of this method is the ease with which different surface heat transfer coefficients can be accounted for. A much simpler vector diagram method is presented for calculating the complex thermal impedance of a wall or roof. The errors which occur with this method are chiefly due to representing a continuous wall by a lumped resistance-capacitance network. The lumping error for a "T" network representation of a homogeneous wall is evaluated analytically: the same method can be applied to more complex circuits.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number7849
NPARC number20337972
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Record identifiere21597a2-1c66-46a1-9c5b-e53a1b5c6fe5
Record created2012-07-19
Record modified2016-10-03
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