[Equest-users] High space heating values

[eric wang]

Maybe you can create a hourly report in eQUEST including HVAC system and thermal zone as variable types to check the real conditions of the HVAC systems. 
 
The hourly results series I always pick up are as follow
 
total central heat coil output
toal central cool coil output
total system supply air flow
total system return air flow and,
ratio of outside air to total supply air.
 
I think the hourly report is very useful for troubleshootng specially for unexpected cooling or heating loads.
 
HTH
 
Shaojie
 
--- On Wed, 9/17/08, Doug Maddox <DougM at TWGI.com> wrote:

From: Doug Maddox <DougM at TWGI.com>
Subject: Re: [Equest-users] High space heating values
To: "Eric O'Neill" <elo at MichaelsEngineering.com>, "Xavier García Casals" <xavier.garcia at aiguasol.coop>
Cc: equest-users at lists.onebuilding.org
Date: Wednesday, September 17, 2008, 2:21 PM








I have done a comparison between DOE2.1 and DOE2.2 for an office building with a boiler and chiller serving a VAV air handler.  Heating and cooling loads were almost identical between the two (as listed in the SS-A reports).  Boiler gas consumption was about 10% lower for DOE2.2.
 

Doug




From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Eric O'Neill
Sent: Wednesday, September 17, 2008 10:47 AM
To: Xavier García Casals
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] High space heating values
 
Our infiltration values and schedules are both set the same. Would you mind elaborating on what you mean by calculation method? 
 
We’ve tried to analyze the loading to see if the heating calculation is the same; however report sheet LS-D from each program is for a specific hour of a day and of course the peak load happens on different days at different times of the year which means you’re comparing red delicious apples to granny smiths. We’re going to be parsing the 8760 data from the hourly reports at some point to see if we can’t figure out if the internal loads are different, if a specific shell component is yielding significant losses, or if the whole building is just being calculated differently. I was just hoping someone might have some insight into what’s going on and could point me in the right direction. 
 
Thanks,
 
Eric 


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Xavier García Casals
Sent: Wednesday, September 17, 2008 3:44 AM
To: Eric O'Neill
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] High space heating values
 
Did you have a look at infiltration values, schedules and calculation method (effects of outside T and V)?. Since Std.90.1 does not fix this values both programes could be using different defaults with a significant impact on heating demand.

En/na Eric O'Neill ha escrit: 
Good evening all, 
 
So we’re beginning the transition from VDOE (DOEv2.1e) to eQuest (DOEv2.2), and we noticed that eQuest tended to result in higher space heating requirements. We have attempted to reconcile the difference, but even when we set two baseline buildings as closely as possible in their respective program - setting as many details the same as we could - we still couldn’t get similar space heating results. Most of electric consumptions were close enough, however the space heating section results indicated about a 40% more heating in eQuest than in VDOE. The eQuest model is showing about 0.67 therms/square foot for something similar to an ASHRAE baseline (although it’s not exactly) which seems high. 
 
In a similar fashion, I’m working on a NAPA autoparts store, which, as most know, are extremely simple. My output there is about 0.76 therms/square foot. I built it to the dimensions that they gave me, however I set all the components to the ASHRAE 90.1 standard and left the remainder as defaults. 
 
Has anyone else experienced this? 
Eric O'Neill 
Mechanical Engineer 
Energy Division - Michaels Engineering 
811 Monitor St. Ste 100 
La Crosse, WI 54603 
v: 608-785-1900 x521 
f: 608-784-2270 
elo at michaelsengineering.com 
http://www.michaelsengineering.com       



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--  Xavier García Casals Sistemas Solares, Eficiencia Energética e Ingeniería Bioclimática AIGUASOL INGENIERÍA Sistemes Avançats d’Energia Solar Tèrmica SCCLC/ Palermo, 17. Bajos dcha. 28043 MadridTel: (+34) 91 142 27 88 C/ Roger de Llúria,  29 3r 2a 08009 BarcelonaTel: (+34) 93 342 47 55  Fax: (+34) 93 342 47 56 Mobil: 660 22 94 45xavier.garcia at aiguasol.coophttp://www.aiguasol.coop 
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