[Equest-users] Serious T-24 issues.

[Chakraborty, Jude]

Hi Ramya,

 

Thanks for the response. I hope you are doing well. I had called you
sometime back and left a voice message as well. 

 

Anyways, the problem is that I have put in all the proposed design
parameters in my baseline case and that is where it is giving me about
20 unmet hrs total which is about 0.6%. It wasn't giving me the same in
my first run but after working around with the capacities and throttling
range values, I am able to jot that down. 

 

But when I try to run the T-24 compliance, it automatically creates a
standard building case and a proposed case and I am having hard time in
figuring out how to change my proposed case as I have only one .pd2 file
which is my baseline case. Also, the SS-R and SS-F reports which
actually shows the system and zone by zone unmet hours, I can view them
only in my Baseline.sim and not in any of the other cases mentioned. See
the screenshot below for the options I have in the proposed.sim file.
So, I don't even know which systems or which zones are giving me
problems in the proposed case. 

 

So, yeah lets see if anyone else has some constructive feedback on the
same. 

 

Thanks again,

Jude.

 

 

 

 

 

From: r s [mailto:ramyashivkumar at gmail.com] 
Sent: Thursday, November 17, 2011 12:21 PM
To: Chakraborty, Jude
Subject: Re: [Equest-users] Serious T-24 issues.

 

Jude,

I have never run a T-24 compliance so I might not be able to help you
with that. But as far as unmet hours in the proposed case, I would
suggest looking at the airside summary in eQUEST. Such huge amount of
unmet hours 68.9% usually means that the problem could be coming from
1. one or 2 systems which have a huge number of unmet hours 
2 and that its something basic like heating/cooling system inputs or
capacity/loads mismatch or your setpoints

I would suggest looking at how that 68.9% percent has been arrived. is
it even distributed unmet hours across all systems in the building, if
it is then there is a mismatch between your loads and design or if its
just one system then check your inputs for the system and how the system
size compares to what equest auto sizes it to etc, then check the loads.
I am sorry I am being very vague here.

This is where I would look first to solve unmet hours problem. And from
your write up it appears that once you solve this the next step might be
easier. Again I could be totally incorrect ...so I will wait for you to
provide an update when you crack this. Good luck

Ramya

On Thu, Nov 17, 2011 at 2:50 PM, Chakraborty, Jude <
Judhajit.Chakraborty at wspfk.com> wrote:

Hello all,

 

I am having some serious Title -24 compliance errors in equest. I really
apologize as I am attaching about 4 screenshots.  Hopefully I can get
some constructive responses. 

 

Every time I run the compliance run, it runs all through (100% through
all the steps with no errors) but the result is a non compliant building
with a message: " Hours outside throttling range >10 percent"

 

Now in my baseline building, the hours outside the throttling range is
only 0.06%. Please see the image below: I have about 20 unmet hours for
all the systems (4 VAV and 10 FCU).  

However when I look into the proposed building sim file and the standard
building sim file, it seems that I am having many hours outside the
throttling range.  I am attaching them as well.  And to add to my agony,
when it runs the simulation, it starts creating a file called, "Proposed
HVAC sizing.sim". But then when the simulation ends and I get the
non-compliance nod, the HVAC sim file vanishes.  While it was running, I
managed to capture a screenshot which I am attaching as well. 

 

Now my question is, how do I change my proposed design model to make it
compliant?  Equest also creates these Title-24 baseline and proposed
.inp files for both the building and the HVAC systems but they are all
blank. 

Did anyone have this experience with T-24 modeling before? I am at a
serious fix and any help will be highly appreciated. 

 

Thanks,

Jude.

E. judhajit.chakraborty at wspfk.com
<mailto:judhajit.chakraborty at wspfk.com> 

W. built-ecology.com <http://www.built-ecology.com/> 

 

 

 

 

 

 

 

 

 

 

 

 

 


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