[Bldg-sim] RE : Infiltration effect in Climate 1

[mark dewsbury]

Dear Gents,

I work in empirical validation research using an Australian software which I
believe is very similar in many aspects to EneryPlus.

In the Australian software the infiltration rate is informed by the:

-          wind speed data fro the climate file

-          The nominated terrain category and a 

-          Default constant value regardless of wind speed

 

 

 

I have some research which has linked variations between simulation and
measured room temperatures and infiltration calcul;ations. 

 

 

This is totally separate to the Natural Ventilation Model, which includes
aperture opening size, wind speed, terrain category, etc

This is an area which we have some concern with and requires further
empirical validation. 

 

Mark Dewsbury

Residential Thermal Performance Research 
School of Architecture
University of Tasmania
Locked Bag 1324
Launceston 7250
mob: 0417 290 807
fax: 03 6324 4088
e: mark.dewsbury at utas.edu.au

  _____  

From: Genest, Frederic [mailto:fgenest at pageaumorel.com] 
Sent: Tuesday, 2 August 2011 11:03 AM
To: ROBERT GOMEZ; bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] RE : Infiltration effect in Climate 1

 

 

Hello Richard.

I'm not used to eQuest, but since it is using DOE in the background, same as
EE4 I'm using more frequently, I'll try to answer correctly.

Climate Zone has nothing to do with infiltration rates, except when in comes
to wind speed and such. However, I don't think DOE is considering wind speed
when calculating infiltration rates; it is usually defined as a constant,
based on a value such as ACH or cfm/ft.sq. of wall area.

As such, I would start to check your infiltration inputs to see what is
defined, first in eQuest and then in the DOE input file. I'm pretty sure
you'll find your answer somewhere there.

Also note that design infiltration rate and "actual, under operating
conditions" infiltration rate, are two different things. The average
constant infiltration rate is adequate enough for the later one.

Also, if you ever need to model a real infiltration from blower door test
results, I personnaly use the 50 Pa value divided by 20 for actual, normal
operation conditions, while the 75 Pa value would be divided by 35 (in
whatever units those values are provided).

Regards.



Frederic Genest, ing., M.Sc.A.
LEED AP, ASHRAE HBDP
fgenest at pageaumorel.com

Pageau Morel et associés
210 Cremazie Ouest, suite 110
Montréal, Qc H2P 1C6
T) 514-382-5150 begin_of_the_skype_highlighting              514-382-5150
end_of_the_skype_highlighting begin_of_the_skype_highlighting
514-382-5150      end_of_the_skype_highlighting  F)514-384-9872
www.pageaumorel.com


-------- Message d'origine--------
De: ROBERT GOMEZ [mailto:rsg4999 at yahoo.com]
Date: dim. 31/07/2011 23:05
À: bldg-sim at lists.onebuilding.org
Objet : [Bldg-sim] Infiltration effect  in Climate 1

Hello all,
 
I'm currently involved in a project that is located in International Climate
Zone 1 (Very Hot - Humid). The building has no heating system, HVAC systems
are only for cooling. Infiltration effect is smaller than I expected from
the eQuest energy model result. I know it has something to do with the
climate. Can anyone tell me the reason why?
 
Thanks in advance!
 
 
Richard Gulli
Project Engineer

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