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why infiltration in summer and winter are different?

asked 2021-05-08 09:25:56 -0500

Moheete's avatar

updated 2021-05-10 21:23:59 -0500

I found some .idf files that are of infiltration schedules. I found the infiltration schedule some odd! beacouse it is different throught the year. I want to know why they are different? thanks

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answered 2021-05-09 18:33:39 -0500

Jim Dirkes's avatar

Generally, the winter winds are stronger, thus making infiltration higher. Infiltration, in my opinion, is difficult to model accurately. I like the treatment described by Lisa Ng, Steven Emmerich and Andrew Persily in NIST Technical Note 1829. (

It provides coefficients which vary infiltration by wind speed, though you still need to assign a base rate for the infiltration.

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The zone air (Tzone) to outdoor air (Todb) temperature difference is also greater in the winter than the summer.

MatthewSteen's avatar MatthewSteen  ( 2021-05-10 11:38:22 -0500 )edit

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Asked: 2021-05-08 09:25:56 -0500

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Last updated: May 11 '21