[Equest-users] Plenum Space temperature and effect of plenum load

[Chris Jones]

A few of places to begin:

1.  Does the factory actually have three spaces - conditioned, plenum 
and space under roof?  Or is the plenum directly under the roof?  The 
model should represent the building.
2.  What are the constructions between the spaces?  Is there a 
ceiling in the factory?  What is its R-value.
3.  How did you define the light fixture sensible heat distribution?
4.  How does the model HVAC system represent the return air path: 
directly, by duct, or by plenum?

Read the LS-B reports for each of the space to see if internal 
conduction is represented.  The space beneath the roof should show 
and change in heating/cooling loads when you change the reflectivity.

Re.  Supply air - do you mean the self-sized supply air flow as 
reported in SV-A?  This air flow changes based on numerous 
factors.  Changing the reflectivity would have negligible effect on 
the self-sized peak air flow, especially if you have defined a Min 
Design Flow in the Air-Side HVAC Zone Parameters.

Or do you mean the hourly supply air flow throughout the year?

The manual is an excellent place to start for many of these questions.

At 06:46 AM 21/05/2012, Uday Gorre wrote:
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>Hello all,
>
>I am modeling a assembly factory of 40000 sq .ft. floor area with 
>total height of 19.6 ft and pitched roof (8 degrees). Conditioned 
>height is 10 ft only. When I used multi level space option in eQUEST 
>(entered 10 ft is the conditioned height), by default software 
>creates three spaces (named as conditioned space, Plenum space and 
>under roof). After completion of simulation, LS-C report (Building 
>Peak Load Component)is  not included roof conduction load (My 
>observation was plenum and conditioned space both are at same 
>temperature therefore no heat transfer between these two ). How much 
>is the plenum space temperature I have to consider ? and also  Where 
>this plenum load accounted in simulation? . When I changed any 
>modification in the roof construction by using reflective surfaces 
>there was no change in supply flow (I think this was because of no 
>reduction in load in the LS-C report). How this roof conduction load 
>reduction effected in the conditioned space ?.
>
>Do such loads (plenums) get directed straight back to the central 
>air handler, or do they also partially interact with the zones as well?
>
>Can anybody please help me in this issue.
>
>Thanks &regards
>
>Uday Kumar
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 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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