[Equest-users] Heating is not on for System Type Pkgd Var Vol, and 4380 under heated hours

[Jing Hong]

Michael,

Thanks for your response. I think you are correct that the Thermostat type
should be Reverse Action for VAV. I changed the thermostat type to
"Reverse Action" accordingly, but the space heat is still ZERO.

Jing

On Tue, Nov 13, 2018 at 3:41 PM Michael Busman <mbusman04 at gmail.com> wrote:

> Jing,
>
> It's been a while but I'm remembering back to my days using VisualDOE.
> You might want to check how your thermostat is defined.  To get heating to
> simulate properly with a VAV system, the thermostat needs to be defined as
> reverse acting.  Take a look at this.
>
> My best,
>
> Mike Busman CEM
> Retired Senior Energy Engineer
>
> On Tue, Nov 13, 2018 at 1:32 PM Daric Adair via Equest-users <
> equest-users at lists.onebuilding.org> wrote:
>
>> Jing;
>>
>>
>>
>> First thing that jumps out at me is that there is no Heating Discharge
>> Air Tempertaures or Reheat Temperatures set on the System>Heating Tab (last
>> image you shared). For a VAV System I’d expect these values to be something
>> like: Zone Max Temp: 90F Hot Deck Max Leaving Temperature 60F and Reheat
>> Delta T: 35F.
>>
>>
>>
>>
>>
>> Thanks,
>>
>> *DARIC R ADAIR* PE, CEM, BEMP
>> Mechanical Engineer, Energy Analyst
>>
>> *Henderson Engineers*
>> daric.adair at hendersonengineers.com
>>
>> *Licensed in* KS
>>
>>
>>
>> *From:* Jing Hong <hongjing.shirley at gmail.com>
>> *Sent:* Tuesday, November 13, 2018 3:16 PM
>> *To:* equest-users at lists.onebuilding.org; equest-users at onebuilding.org
>> *Subject:* [Equest-users] Heating is not on for System Type Pkgd Var
>> Vol, and 4380 under heated hours
>>
>>
>>
>> Dear All,
>>
>>
>>
>> My model is located in Mexico and three zones are equipped with VFD. So I
>> selected Pkgd Var Vol + Heat pump for these three zones and set the system
>> up by the design cooling and heating capabilities. Currently, the SS-R
>> shows 4380 under heated hours for each of the zones. And no space heat is
>> provided for any of the zones. Does anyone know the possible reasons for
>> this phenomenon?
>>
>>  I've done several solutions by searching:
>>
>> - Increased Throttling Range
>>
>> - Night Cycle Control --> Set to "Cycle on Any"
>>
>>  - Fan Control and Placement - Set to" Hourly Report Schedule"
>>
>>
>>
>> [image: image.png]
>>
>> [image: image.png]
>>
>> [image: image.png]
>>
>> [image: image.png]
>>
>> [image: image.png]
>>
>> Thank you!
>>
>>
>>
>> Jing
>>
>>
>>
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