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RE: [EnergyPlus_Support] Algorithm HAMT and number of warmup day

HAMT is based on WUFI.  As a WUFI user I can tell you that a wall will start with some initial, arbitrary moisture content assumption and then adapt to the climate file weather conditions over time.  A mass masonry wall can take 2-3 years or more in WUFI to reach repeatable moisture content through the assemble.  We often run multi-year models but only look at the last year unless we are really concerned with the initial conditions in the wall and have selected representative starting conditions.  Light weight, vapor permeable assemblies react faster.  I assume that EnergyPlus warm up has to do something similar for HAMT.


Ned Lyon, P.E. (MA, WV)
Staff Consultant

781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax


From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of claraspitz@xxxxxxxxx
Sent: Wednesday, November 06, 2013 9:50 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Algorithm HAMT and number of warmup day



Hi all,
I'm using the HAMT algorithm of EnergyPlus to compare measure and simulation in a wall at different section. When I considere the parameter vapor coefficient, I take 1e-8 inside and outside, the parameter number of warmup day is very influencial to the output temperature and humidiy. The value of number of warmup day is 50 or 100.  

Somebody to explain why the number of warmup day is very influential  ? It's normal ?




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