[Equest-users] Setting DOAS system type airflow rates

Thu May 16 12:04:51 PDT 2019

Your COOL-SET-T and MIN-SUPPLY-T are both defaulting to 65 F, which results in cooling and reheating. The solution is to drop your heating setpoint slightly and enter cooling setpoints that are slightly higher than the heating setpoint, as in the attached file.

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Chris Hadlock via Equest-users
Sent: Thursday, May 16, 2019 2:33 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Setting DOAS system type airflow rates

It's been suggested I share my pd2 and inp (and weather) file to allow others to perhaps help with the troubleshooting. Those 3 files have been attached. I am using build 7175, DOE 2.3.

Thank you to all that take a look and provide suggestions.

Chris

On Thu, May 16, 2019 at 12:00 PM Nicholas Caton <Nicholas.Caton at se.com <mailto:Nicholas.Caton at se.com> > wrote:

A fast shotgun guess:  Is it possible the boiler(s) serving that hot water loop feature a 5:1 turndown and the loop operation is set to standby, meaning the boiler(s) can’t turn off completely?

~Nick

Nick Caton, P.E., BEMP

  Senior Energy Engineer
  Regional Energy Engineering Manager

  Energy and Sustainability Services
  Energy Performance Contracting 

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From: Equest-users <equest-users-bounces at lists.onebuilding.org <mailto:equest-users-bounces at lists.onebuilding.org> > On Behalf Of Chris Hadlock via Equest-users
Sent: Thursday, May 16, 2019 9:16 AM
To: Brian Fountain <Brian.Fountain at sa-footprint.com <mailto:Brian.Fountain at sa-footprint.com> >
Cc: equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org> 
Subject: Re: [Equest-users] Setting DOAS system type airflow rates

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For my most recent project for which I have a DOAS system, I've noticed a constant (8760 hrs) heating energy consumption. I've got the DOAS set up as a gas-fired furnace and DX cooling coil. I've set my auxiliary fuel consumption set to 0 and no preheat. During the summer where there is active cooling my furnace is running at about 19% of it's design capacity (simultaneous heating and cooling). Has anyone noticed their DOAS system doing this? Any suggestions? 

Thanks,

Chris

On Wed, May 15, 2019 at 9:52 AM Brian Fountain via Equest-users <equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org> > wrote:

Hi Chris.

Yes – you can explicitly set the heating and/or cooling capacities of the DOAS system type.

Cheers,

Brian

Footprint

Brian Fountain
Associate
d 416 572 8501 m 416 562 6831

From: Equest-users <equest-users-bounces at lists.onebuilding.org <mailto:equest-users-bounces at lists.onebuilding.org> > On Behalf Of Jones, Christopher via Equest-users
Sent: Wednesday, May 15, 2019 8:39 AM
To: Bishop, Bill <bbishop at pathfinder-ea.com <mailto:bbishop at pathfinder-ea.com> >
Cc: equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org> 
Subject: Re: [Equest-users] Setting DOAS system type airflow rates

CAUTION: EXTERNAL SENDER 

Thanks Bill,

Re. DOAS coils – is there an option to specifically size the coils? 

Christopher R Jones, P.Eng.

T+ 1 416-644-0252

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill via Equest-users
Sent: Tuesday, May 14, 2019 2:02 PM
To: Brian Fountain <Brian.Fountain at sa-footprint.com <mailto:Brian.Fountain at sa-footprint.com> >
Cc: equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org> 
Subject: Re: [Equest-users] Setting DOAS system type airflow rates

Thanks, Brian! You make an important point on design sizing of DOAS systems – the hourly ventilation rate is determined by the systems/zones that the DOAS serves, and the corresponding ventilation controls for those systems.

Some additional observations:

-          If you enter the DOAS SUPPLY-FLOW (Design cfm): 

o   The design fan power will be based on the SUPPLY-FLOW multiplied by SUPPLY-KW/FLOW (if entered).

o   Any central airhandler coils will be autosized based on the SUPPLY-FLOW. (See the SV-C report in the SIM file.)

-          If instead, you let the DOAS SUPPLY-FLOW (Design cfm) default by leaving it blank: 

o   The design fan power will be based on the design ventilation rate determined by the served systems multiplied by SUPPLY-KW/FLOW (if entered).

o   Any central airhandler coils will be autosized based on the design ventilation rate.

-          If you enter zone ventilation as OA/FLOW-PER (cfm per person), to simulate DCV or to size the ventilation per ASHRAE 62.1 guidelines, the design ventilation rate will be based on the highest hourly value in the occupancy schedule. So you have to have at least one hour with 1.0 occupancy either in the weekday, weekend and/or CDD/HDD schedules. Otherwise, the design ventilation rate will be reduced.

~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP

Senior Energy Engineer

T: (585) 698-1956                        F: (585) 325-6005

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From: Equest-users <equest-users-bounces at lists.onebuilding.org <mailto:equest-users-bounces at lists.onebuilding.org> > On Behalf Of Brian Fountain via Equest-users
Sent: Monday, May 13, 2019 5:47 PM
To: equest-users at lists.onebuilding.org <mailto:equest-users at lists.onebuilding.org> 
Subject: [Equest-users] Setting DOAS system type airflow rates

Caution note when using DOAS systems – you cannot simply define the OA volume in the flow parameters tab of the DOAS fan.  

In DOE-2.3, there is now a system type ‘DOAS’ that will properly provide outdoor air either directly to zones or to the mixing section of the system it serves.  The volume of outdoor air delivered by this system is determined by the outdoor air flow rates of the zones that take air from this system.  The screenshot below suggests that the unit will be delivering 6,545 cfm of OA but in fact this system was only delivering 500 cfm as the served zones did not have their OA volumes set properly.  

When the OA was defined in the zones taking air from this system, the volume of OA in the DOAS was as expected.

Today’s lesson – define outdoor air rates properly, and hourly reports are your friend.

Footprint

Brian Fountain P.Eng., LEED AP BD+C, BEMP
Associate
Brian.Fountain at sa-footprint.com <mailto:Brian.Fountain at sa-footprint.com> 

100 Sheppard Ave Suite 800 Toronto Ontario M2N 6Z1
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