[Equest-users] Spam:Re: eQuest Design Days

[Jay Keazer]

Todd, 

You can tell eQUEST to run multiple Design Days by setting the start day and
the number of days in the Design Day Properties dialog box in the detailed
interface (don't know about the wizard).  For example I normally set the
start day to 6/1 and the number of days to 120.  That way it will cover all
the solar angles from June - September combined with the ASHRAE Cooling DB /
WB, and will use the heating/cooling design day schedules specified in the
Week Schedules.  I figure this should pretty much cover it, although as Carol
said there is usually a peak in the weather file that exceeds the ASHRAE
conditions.  

Jay Keazer,  EI
Energy Engineer
TME, Inc.
2039 N Green Acres Road
Fayetteville, AR  72703
 
ph   479.521.8634
fax  479.521.1014
jkeazer at tmecorp.com
www.tmecorp.com


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol
Gardner
Sent: Thursday, August 28, 2008 2:32 PM
To: Todd Lagus
Cc: equest-users at lists.onebuilding.org
Subject: Spam:Re: [Equest-users] eQuest Design Days

Todd,

If you put in any data at all in the DD screens and run eQUEST it will 
do the DD sizing off that information. If you delete the data on those 
screens, however, and let the model run using the TMY data you should 
get output that looks more like what you want. The TMY data extremes are 
frequently higher than the DD input from ASHRAE and do include all the 
solar info. Try it out and see what you think.

Carol

Todd Lagus wrote:
> Thanks for your input Carol.
>
> I think my main concern is that the sizing peaks aren't necessarily going
to occur in the summer.  Say you have a building with a lot of south facing
glass.  This space may peak in October.  I did a quick validation model in
eQuest and another peak sizing program to see how different the loads would
be for such a case.  The eQuest model solar gains were only about 35% of what
the sizing program calculated.  I believe this is because the sizing program
always assumes a clear day to size equipment for peaks, while the eQuest
weather files use average data.  Each kind of calculation serves a purpose,
one for sizing and one for simulation, but relying on the simulation weather
file to size equipment seems risky.  Everything may turn out ok in these
cases because the temperature is less in October than in the summer, but I'm
not to a point where I'd trust it yet.  
>
> Thanks,
>
> Todd
>
>  
> Todd Lagus, EIT
> Mechanical Engineer
> Sebesta Blomberg
> 2381 Rosegate
> Roseville, MN 55113
> Phone: 651-634-7236
> Fax: 651-634-7400
> www.sebesta.com
>  
> This message has been sent via the Internet. Internet communications are
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> -----Original Message-----
> From: Carol Gardner [mailto:gems at spiritone.com] 
> Sent: Thursday, August 28, 2008 1:48 PM
> To: Todd Lagus
> Cc: equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] eQuest Design Days
>
>
>
> Todd,
>
> I have been told in the past that it is best to use the TMY weather file 
> rather than the Design Day input. If you use the TMY3 file you should 
> have all the latest weather/solar info. Just do as you would with DD 
> calcs: revise you schedules for summer hottest day with everything on 
> and winter coldest day dead of night with everything off, set your 
> sizing factors to what you want and hit enter. This should give you good 
> output. Be sure to have all the wall/glass info in that you want and be 
> sure you have the right thermostat type and throttling range for it 
> based on your HVAC system type.
>
> Carol
>
> Todd Lagus wrote:
>   
>> Hello All,
>>
>> Has anyone ever tried to use eQuest for sizing equipment? I know about 
>> the design day input, but it only allows for a single design day, 
>> which doesn't necessarily cover all of the bases for solar angles. 
>> Based on the standard TMY2 weather files, I know that shouldn't be 
>> done, but has anyone ever created some design day weather files? I'm 
>> especially suspicious of the equipment sizing due to the sunlight 
>> clarity factors. It would save a lot of time if eQuest could do design 
>> day and simulation calculations that could be trusted, but I'm not 
>> sure if there is a time effective way to do it. Any input would be 
>> greatly appreciated.
>>
>> Thanks,
>>
>> Todd
>>
>> **Todd Lagus, EIT**
>>
>> Mechanical Engineer
>>
>> //Sebesta Blomberg//
>>
>> //2381 Rosegate//
>>
>> //Roseville////, MN 55113//
>>
>> //Phone: 651-634-7236//
>>
>> //Fax: 651-634-7400//
>>
>> //www.sebesta.com <http://www.sebesta.com>//
>>
>> //This message has been sent via the Internet. Internet communications 
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>> therefore cannot guarantee that this message has not been modified in 
>> transit. This message and any files transmitted with it are 
>> confidential and intended solely for the use of the addressee. If you 
>> have received this message in error, please notify the sender and 
>> destroy your copies of the message and any attached files.//
>>
>> ------------------------------------------------------------------------
>>
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