[EnergyPlus_Support] Multiple sys/common return, deep daylighting ?s

["Kristin Field" <fieldkm@xxxxxxxxx>]

Hello, EP folks.  Two questions for you:

(1) A proposed underfloor & displacement air system will utilize
multiple VVT systems, which share a common return plenum and shaft.
Can this be modeled explicitly in E+ using air nodes (roomair or
other)? The designer claims that during heating the return
temperatures in the core will be higher than on the perimeter. As the
perimeter VVT systems provide warm air directly they can utilize all
warmth in the RA to reduce the heat added to the SA, so it is
important to have a valid determination of this mixed RA temperature,
and to have distinct systems with separate SA temperature control on
each perimeter.  Any advice on whether and/or how this could be
implemented in EP?
 
(2) One situation we struggle with regularly is the daylighting
calculation where the daylit zone is deeper than the thermal zone.
This is typical in large open office configurations, with very tall
daylight glass (or light-redirecting devices) and dimming ballasts
installed to the interior. The daylight zone may be 30' deep, but the
thermal zone is typically only 15' deep. The zones are separated in
the model by an air wall. Is there a way to explicitly model daylight
which passes into this interior zone, without declaring "virtual"
exterior walls & windows, etc., at that 15' boundary?  I remember that
daylight doesn't pass through interior windows, but I'm wondering if
there's another way to get it to cross through zones.

Thanks for your help!

Kristin Field



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