[Equest-users] PSZ Very High Unmet Hours

[Bruce Easterbrook]

     This is just basic fundamentals and has nothing to do with eQuest.  
If you have 50 rooms, and want perfect control in each one you need 50 
t-stats and 50 PSZ units.  Once you move away from this you need a way 
to independently manipulate the temperature in each room up and down.  
VFD will vary volume and pressure, but will not independently vary the 
volume to an individual room as you are using them.  There are many ways 
to do this, VAV, terminal units, multi-zones.  Either your concept of 
the design or the design itself is flawed.  Either way there is no point 
doing any more work with eQuest until you resolve the design problem.  
Equest is working fine and your results are totally expected.  I rarely 
open files, I do not have time, but more specifically there is no point 
in your case.  You have junk going in, therefore you have junk coming out.
     Dakota has done you a big favour, much more eloquent than I and 
given some excellent pointers.  You need to pick up the phone and nail 
down the basics and don't forget to ask about the outside air.  VAV and 
OA don't always play well together.  You will also have rooms with 35 
kids and a room with one principal.
     Sorry about the touch of flame but much of the debate on this site 
lately has regressed to teaching of basic concepts or to users who seem 
to have only spent a week or 2 in the trenches.  It seems some of the 
old hands are getting cranky because the privilege of asking questions 
on this site is getting abused.
Bruce Easterbrook P.Eng.
Abode Engineering

On 29/07/2010 05:32 PM, vidya gowda wrote:
>
> Dear John,
>
> Have posted the proposed and the baseline case model on behalf of 
> Adam, also responding to your query about VFD, about varying the 
> flows, do we need to model a vav system?.. or I am not very familiar 
> with this part as the specs don’t show VAV terminal units, they have 
> provided the VFD schedules. It would really help if you could let us 
> know how to to rectify the error. I also went ahead and changed the 
> hot deck temperature to default as suggested by you and Demba. But it 
> doesn’t seem to help much
>
>
> Thanks for responding,
>
>
> Kind Regards,
>
>
> Vidya
>
>
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