[Equest-users] Zones with different HVAC systems

Thu Nov 16 08:47:12 PST 2017

Hi Bruce,

Thanks for your instruction. Your suggestion makes a lot of sense. But I am
wondering, if I make the ventilated zones as conditioned zones,eQuest will
ask for Thermostat, etc. Should I make the Cooling set point very high and
heating setppoint very low to avoid eQuest calculates loads? By your
experience, will that affect my space cool or space heat number?
Thanks,
Jing

On Thu, Nov 16, 2017 at 8:52 AM, Bruce Easterbrook <bruce5 at bellnet.ca>
wrote:

> It is what I do, at least initially.  You can change it later.  The reason
> is that if it is an actual system then eQuest will generate reams of data
> on it, you can do hourly reports to get more.  You can also play with it's
> settings and see the impact on the adjoining building zones.  A model is an
> investigation and a platform to experiment to find the most energy
> efficient way to condition the building and the cost implications so you
> can also also design an economically efficient building.
> Ventilation is not very controlled and you have fans and motors consuming
> power to move this air.  So it is conditioned.  The main reason is, it is a
> power draw on the building.  You need to quantify it.  The next question
> is, is it the best way to do it?
> Bruce Easterbrook P.Eng.
> Abode Engineering
>
> On 11/15/2017 10:32 PM, Jing Hong wrote:
>
> 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 <(416)%20644-0252>
>>
>>
>>
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>>
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>>
>> wsp.com
>>
>>
>>
>>
>>
>> *Please consider the environment before printing...*
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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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>> --
> PhD Candidate, LEED AP BD+C
>
> School of Architecture and Urban Planning
> University of Wisconsin-Milwaukee
>
>
>

-- 
PhD Candidate, LEED AP BD+C

School of Architecture and Urban Planning
University of Wisconsin-Milwaukee
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