Re: [EnergyPlus_Support] warm-up time

["Edward Lyon" <eglyon@xxxxxxx>]

As I understand the startup of an E+ calculation, the program must
iterate to a repeatable starting condition before moving into the actual
calculation.  Consequently, if you try to model single days (like just a
design day), your model will always look like the conditions have been
the same for a long time.  To see what you want, you probably need to
calculate several days with the first days being your cool weather and
the last days being your hot weather.  You should then see the building
respond to a quick warmup.

Ned Lyon

Senior Project Manager
Simpson Gumpertz & Heger Inc.

41 Seyon Street
Building #1, Suite 500
Waltham, MA  02453

Phone:  781-907-9000
Fax:  781-907-9009

>>> mohitmehta1@xxxxxxxxx 03/11/04 12:38 AM >>>

hi:

if am running a simulation of a high mass NV building between aug 14 -
17 (4 hot days) - shouldn't the building take a few hours or days to
warm up? like indoor and outdoor temperatures starting out the same on
the first day (aug 14), and indoor air temperatures climbing gradually
over the four-day period; finally balancing out? it appears that the
mass starts out as preheated (warmed/cooled). does it use 3-4 warm-up
days before the days that i am looking at are reported?

thank you. 

~m


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