[Equest-users] Unconditioned spaces

[Bishop, Bill]

Lars,
For (1.), set your DESIGN-HEAT-T and DESIGN-COOL-T per the guidance in
the help menu.
For (2.), put the lighting and miscellaneous loads in the unconditioned
spaces if that's where they actually are. When you create your DHW
heater you can specify a zone where it is located. Your unconditioned
spaces still need to be assigned to thermal zones and HVAC systems. I
usually assign them to the HVAC system of an adjacent space. The system
will not try to heat or cool the space directly, but the
DESIGN-HEAT/COOL-T can create loads on the interior walls.
Regards,
 
William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P Please strive to live sustainably.
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lars
Fetzek
Sent: Monday, September 21, 2009 11:21 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Unconditioned spaces
 
eQuesters,
 
    Here's my latest fiasco:
    I have some conditioned and some unconditioned spaces.  The
unconditioned spaces contain loads from electric water heaters and
lighting and the water usage, itself.  All of these electric and water
loads must, of course, be modeled.
    However, these unconditioned spaces do not include HVAC systems.
The unconditioned spaces simply exhaust air from the conditioned spaces
to the outside via exhaust fans.  I've been advised by previous
listserve e-mails to model the conditioned spaces as directly exhausting
to the outside.
    The problems are these:
 
1.  How do I get eQuest to model the temperatures of the unconditioned
spaces without specifying HVAC systems (which don't exist)?  This is
important insofar as the unconditioned spaces can conduct heat to the
adjacent conditioned spaces via shared interior walls/floors/ceilings.
 
2.  In order to model the plumbing and lighting systems (for water and
electricity use), I have to assign them to spaces.  If I assign them to
the conditioned spaces, this will artificially inflate their affect on
the cooling loads of those conditioned spaces.  However, if I assign
them to the unconditioned spaces, then I have to assign those spaces to
respective thermal zones, which, in turn, require assignment to HVAC
systems that don't exist.  How can this be simply and correctly modeled?
 
    Thanks again.
 
Lars Fetzek, EI
Phoenix Engineering Group
Tampa, Florida
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