[Equest-users] Gas INFRA-RED Radiant

[Dennis Hunt]

Arash,

I've used the following approaches to model overheat gas radiant heating
systems.

Since doe-2 does not have models for heating that is predominantly radiant
in nature; the assumption I use for the heating models are that the
predominant gain mechanism is convection.

I assume the system is well modeled by using a heating coil in the space,
such as a baseboard system (which has no flow).

If the heater is constant output when on then you could use a reset
controlled baseboard with a flat output relation.

If they are space temperature controlled then you use thermostat control.
Both would be good models.

If control is variable based on people sense of comfort then you need a
relationship between space temperature and comfort and then alter the
thermostat schedule to match that relation.

 

Dennis

___________

Dennis Hunt

Mechanical Engineer

Summit Building Engineering

503-246-5241

dhunt at summitbe.com

http://www.summitbe.com



 

 

 

  _____  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Friday, May 25, 2012 8:30 AM
To: Pasgar, Arash; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Gas INFRA-RED Radiant

 

Hi Arash,

 

There are a couple right answers.  Here's an approach I've used:

*        System type UHT

*        Zero out fan energy (0.00 kW/CFM), if there are no space
circulation fans tied to your IR heater operation

*        eQuest doesn't simulate the skin-heating comfort effects of radiant
heat.  If you run into unmet heating hours, you can justifiably lower
associated thermotat setpoints to account for this.

*        DOE2 help files advise adjusting your HIR to 1.05 if products of
combustion are not being vented out of the space (industrial applications).


 

~Nick

 

cid:489575314 at 22072009-0ABB

 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasgar,
Arash
Sent: Friday, May 25, 2012 10:09 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Gas INFRA-RED Radiant

 

Hi all,

 

First of all sorry about the previous message.

 

I have a storage using gas infra-red radiant heaters. Is there accurate way
to model this.

Thank you in advance for your help.

 

Arash Pasgar
Mechanical Designer

Description: Description: Description: Description: Description:
Description: image001

v. 210.546.0200 | www.dbrinc.com

 

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