[Equest-users] Zones with different HVAC systems

[Jing Hong]

Bruce, you mean in eQuest even if a zone needs ventilation only, I still
have to set the zone as conditioned? Then I set the HVAC system as no
heating or cooling. Is that correct?
Thanks,
Jing

On Wed, Nov 15, 2017 at 5:29 PM Bruce Easterbrook <bruce5 at bellnet.ca> wrote:

> Jing, I think the mistake is making the zone unconditioned.  You are
> trying to keep it under control with ventilation, therefore it is
> conditioned, no active heating or cooling but it is conditioned.  You also
> need the temperature profile of what is going on in that space so you can
> understand what is happening.  Buildings aren't always intuitive depending
> what is going on and where it is located.  You have a fully walled and
> windowed zone I presume.  For unconditioned I would think a space like a
> parking garage that is more than half open on 3 sides.
> You also have the impacts of the floor below and the floor above which
> probably have larger boundary surfaces with your second floor space than
> that space has exterior wall.  It may not be energy efficient to let the
> second floor stay near exterior temperatures because of it's impact on the
> floors above and below.  By making it conditioned and giving it to a system
> will give you the information you need to evaluate whether you want to
> treat it with just ventilation.  Open up your heating and cooling set
> points so there really isn't going to be a call for heating and cooling and
> see what the temperatures in the space do.   Then start tinkering with the
> exhaust cfm and zone cooling set point to see if this is practical from an
> energy consumption point of view.  Also watch what is happening in the
> floor above and the floor below.  You can advantage of auto-sizing too.
> Bruce Easterbook P.Eng.
> Abode Engineering
>
>
> On 11/15/2017 2:33 PM, Jones, Christopher via Equest-users wrote:
>
> SUM system type. The DOE2.2 manuals do not explain the SUM system type
> very well. From the DOE2.1e manual:
>
>
>
> 4. System Descriptions
>
> a. Summation of LOADS to PLANT (SUM)
>
> This is actually not a secondary HVAC distribution system, but rather a
> diagnostic tool, which is used to 1) pass the hourly LOADS program output
> to the PLANT program without simulating a system, 2) adjust the constant
> zone temperatures specified in LOADS, 3) simulate the thermostat schedules
> (but not the equipment), and 4) tabulate energy consumption by ZONE (or
> group of ZONEs). SUM is not a miscellaneous SYSTEM-TYPE for UNCONDITIONED
> zones.
>
>
>
> UNCONDITIONEO ZONEs should be assigned to another SYSTEM.
>
>
>
>
>
>
>
> *Christopher R. Jones*, P.Eng.
>
> Technical Specialist
>
> Sustainability & Energy
>
>
>
> T +1 416-644-0252
>
>
>
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>
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>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Jing Hong
> via Equest-users
> *Sent:* Wednesday, November 15, 2017 2:13 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Zones with different HVAC systems
>
>
>
> Dear All,
>
>
>
> I have a building with more than one kind HVAC system. I have the first
> floor with VAV system, and the second floor only has ventilation fans
> running. So I made all the zones on Second Floor unconditioned, and choose
> SUM as air-side HVAC system for second floor. However, the Space Cool of no
> VAV for second floor is even higher than that of the whole VAV, which does
> not make sense to me.
>
> Do you know how the eQuest calculate Space Cool? Should The VAV energy
> consumption be Space Cool+Vent. Fans shown on the simulation output?
>
> Thank you,
>
> Jing
>
>
>
> --
>
> PhD Candidate, LEED AP BD+C
>
>
>
> School of Architecture and Urban Planning
>
> University of Wisconsin-Milwaukee
>
>
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University of Wisconsin-Milwaukee
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