[Equest-users] Can equest be used for calculating ETTV

[Joe Huang]

Ery, others,

There's a deficiency in the method described in your answer because the heat flows 
reported in LOADS, i.e., LS-E by space and LS-F for the whole building,  are calculated at 
the constant LOADS temperature, and not the actual zone (space) temperature that is 
derived in SYSTEMS. This does not affect the temperature-independent heat flows (solar and 
internal gains), but has a big effect on the conductive loads through the envelope, 
particularly in cooling climates.  About 17 years ago, Ellen Franconi (now at RMI) and I 
(then at LBNL :-)) developed a method in DOE-2.1E using User Functions to take the hourly 
component loads from LOADS and correct them for the true zone temperature in SYSTEMS, and 
then aggregate them to produce building-level component loads.  The report is available at 
http://www.whiteboxtechnologies.com/download_complds_rpts.htm .  Unfortunately, User 
Functions have not been hooked up in DOE-2.2 yet, so this method for now can be applied 
just to DOE-2.1E models.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 9/14/2012 10:46 AM, Ery Djunaedy wrote:
> My answer to the same question:
> http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/2011-January/007486.html
>
>
> On 09/14/2012 11:02 AM, Nimesh Prajapati Nimesh wrote:
>> Dear Friends,
>>
>> Can equest be used for calculating ETTV ( Envelope Thermal Transfer value ) ? if yes, 
>> How can we use it so that we can get this value for the building modeled.
>>
>> Thanks,
>>
>> Nimesh Prajapati
>>
>> HVAC Design Engineer
>> (+91 9687133492)
>> email: nimonomics at yahoo.in <mailto:nimonomics at yahoo.in>
>> Skype: nimonicideas
>> Please consider the environment before printing this e-mail.
>>
>>
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