[Equest-users] Gas INFRA-RED radiant heater

[Howe, Timothy]

Technically you need to model both heating and cooling in the baseline and proposed.

You can work around this technicality by modeling the zone thermostat as I stated.  Go crazy set it to 999 in the schedule, but make sure you set the Indoor Design Temperature to a reasonable value or things will go sideways in the autosizing of your system capacities.

In summary,

Baseline:  Model it as a packaged single zone system. Autosize the CFM, fan power based upon Appendix G requirements, cooling (1.15 sizing ratio) and heating (1.25 sizing ratio) capacities, cooling and heating unitary power based upon capacity and 90.1 min efficiency values.
Proposed:  Model it as a packaged single zone system. CFM = 10, kW/CFM = 0,  cooling (1.15 sizing ratio) and heating autosized (1.0 sizing ratio), but put the radiant heater in the baseboard inputs (I would do it this way so that it does not rely on the air side (the 10 cfm) to convey the heat to the space.. Not going to work).  Cooling unitary power same as baseline and proposed based upon the radiant heater eff

Thermostats the same in both cases.


Tim.

Timothy Howe, MS, LEED® AP BD+C
Mechanical Engineer
Stantec
61 Commercial Street
Rochester NY 14614
Ph:   (585) 413-5347
Fx:   (585) 272-1814
Cell: (585) 330-8681
stantec.com<http://www.stantec.com>

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From: Pasgar, Arash [mailto:APasgar at dbrinc.com]
Sent: Friday, June 08, 2012 11:47 AM
To: Howe, Timothy; equest-users at lists.onebuilding.org
Subject: RE: Gas INFRA-RED radiant heater

Thank you Tim.

To make it more clear. I have a 2500 sf shop without any cooling and just gas infra-red radiant for heating.
I think I have no other choice to select unit heater for proposed plan an just over ride the cfm to 10 as you said and enter the heating capacity.

I think I need to do exactly the same for baseline. Am I correct?

Thank you,

Arash Pasgar
Mechanical Designer

[cid:image001.jpg at 01CD4572.C0B0C150]

v. 210.546.0200 | www.dbrinc.com<http://www.dbrinc.com>

From: Howe, Timothy [mailto:Timothy.Howe at stantec.com]<mailto:[mailto:Timothy.Howe at stantec.com]>
Sent: Friday, June 08, 2012 10:24 AM
To: Pasgar, Arash; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: Gas INFRA-RED radiant heater

I would model the radiant heater as baseboard and set you supply fan in the proposed to something low like 10 CFM and put in 0 for the supply fan power.  Also if this space is not cooled, I would use a thermostat schedule for cooling that is high enough that the cooling never turns on.

In the baseline remove the baseboard.  Let the CFM autosize and set the fan power to the allowable kW/cfm as specified in Appendix G.

Tim.

Timothy Howe, MS, LEED® AP BD+C
Mechanical Engineer
Stantec
61 Commercial Street
Rochester NY 14614
Ph:   (585) 413-5347
Fx:   (585) 272-1814
Cell: (585) 330-8681
stantec.com<http://www.stantec.com>

The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.

ü Please consider the environment before printing this email.
From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasgar, Arash
Sent: Friday, June 08, 2012 11:13 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Gas INFRA-RED radiant heater

Hi all,

I have a Gas INFRA-RED radiant heater in a big space. I tried to model it as a unit heater, heat source=furnace, enter heating capacity same as my mechanical sch.
Under SA-V report shows a lot of CFM for fan that is wrong in my case, because there is no supply fan.
How can I fix this in my propose and baseline plan.

Thank you,

Arash Pasgar
Mechanical Designer

[cid:image001.jpg at 01CD4572.C0B0C150]

v. 210.546.0200 | www.dbrinc.com<http://www.dbrinc.com>

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