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<font size="+1">Hi Bill,<br>
I don't have a project to pull up to get to these inputs. I
believe I normally enter the AFUE, and 78% is an medium oil number
and a low gas number. Typically most gas units on the market will
give you a 92% AFUE for a condensing unit and a few are running in
the 94% range. Oil you can get into the 84% range. Don't do
condensing oil, no one is using the correct steel in the heat
exchangers and they rot out after a few years. No units run with
a pilot light anymore and you can see why, it is all spark
ignition. I normally use a warm air furnace on a PSZ. Use 78%
for oil and 92% for gas, no pilot light for either. You can
adjust everything later on the heating/unitary power tab. Grain
of salt, I don't do LEED work, just 90.1. For the project I have
open I have a HIR of 1.08 and 0 auxiliary, gas. So I probably
input 92% AFUE in the wizard, no pilot light.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
</font><br>
On 21/06/2011 10:12 AM, Bishop, Bill wrote:
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<p class="MsoNormal">When selecting “furnace” for the heat
source, eQUEST adds 800 Btu/h for furnace fuel auxiliary
(pilot light) as default. The default 800 Btu/h adds 12% to my
baseline heating energy, so it is not trivial.<o:p></o:p></p>
<p class="MsoNormal">ASHRAE Standard 90.1, Table 6.8.1E lists
minimum furnace efficiency requirements.<o:p></o:p></p>
<p class="MsoNormal">What should I enter for Furnace HIR and
Furnace Fuel Auxiliary for Baseline System 3 (PSZ-AC) and the
new 90.1-2010 Baseline System 9 (Heating & Ventilation;
Warm-air furnace, gas-fired)?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First, which equipment type applies? Table
6.8.1E has three gas-fired equipment types – Warm Air Furnace,
Warm Air Duct Furnace, and Warm Air Unit Heaters. I think both
Systems 3 and 9 would be Warm Air Furnace, since packaged
(System 3) and ventilation (System 9) systems would seem to
preclude duct furnaces and unit heaters.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Second, does the note, “Units must also
include an interrupted or intermittent ignition device (IID)”
mean that no pilot light should be modeled? This note to Table
6.8.1E does not apply to Warm Air Furnaces <225,000 Btu/h
in 90.1-2004 or 90.1-2007, but applies to all Warm Air
Furnaces in 90.1-2010. This is a LEED 2.2 project but the
building is currently under construction.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Third, Warm Air Furnace minimum efficiency
is 78% AFUE or 80% E<sub>t</sub> . Should I use HIR=1.282
(78%) or HIR=1.25?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for your thoughts,<o:p></o:p></p>
<p class="MsoNormal">Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img id="Picture_x0020_1"
src="cid:part1.03020202.03040400@bellnet.ca" alt="Signature
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<p class="MsoNormal"><o:p> </o:p></p>
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