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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My opinion: <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Performance of well-maintained equipment remains much the same
as when it was new and can actually improve. Performance of poorly maintained
equipment can deteriorate within months by 20+%. I cannot imagine any study /
research which could accurately paint a picture of “typical” that would be
useful in energy modeling. For existing buildings, I <u>measure</u> the
performance of critical and larger equipment.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-size:13.5pt;color:#1F497D'>The Building Performance Team<br>
</span></b><b><span style='color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Jin Minming<br>
<b>Sent:</b> Thursday, February 18, 2010 6:09 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Fw: How to estimate performance of HVAC system in
life cycle analysis?<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'>Hello John,<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><br>
Thanks for your reply,<br>
<br>
I can get service life of equipments from Chapter 36 OWNING and OPERATING COSTS
in ASHRAE 2007 HANDBOOK or <a href="http://xp20.ashrae.org/publicdatabase/"
target="_blank">http://xp20.ashrae.org/publicdatabase/</a>. But I am more
interested to understand how the performance of HVAC systems changes during
their life. HVAC equipment performance normally degrades with use and
time, at a rate depending on the quality of maintenance and operations.
Then for different conditions of equipments (best, normal, and worst), maybe
simple degradation rate can be used to indicate how the efficiency of
equipments (such as boiler efficiency, chiller COP, fan efficiency, pump efficiency)
degrades with time. Maybe there are some typical values from actual HVAC
systems although there should be very uncertain in these degradation rates
under actual conditions. <br>
1: Would you please let me know where I can find these degradation data for
HVAC equipment performance? <br>
2: Or maybe it is fair to say that HVAC equipment efficiency would remain
similar to the initial one during their life (about 20 years) under good and
constant maintenance? (I read some papers about how to calculate
operating energy from HVAC systems in life cycle analysis. Most
researchers assume that annual operating energy is a constant during the
building life.) <br>
3: Would you please give me some advice how to quantify or semi-quantify these
performance change of HVAC equipment during their service life?<br>
<br>
Thanks,<br>
<br>
Jim Terrry <br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
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style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
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<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> John Aulbach
<jra_sac@yahoo.com><br>
<b>To:</b> Jin Minming <jminming@yahoo.com>;
bldg-sim@lists.onebuilding.org<br>
<b>Sent:</b> Tue, 16 February, 2010 5:38:06<br>
<b>Subject:</b> Re: [Bldg-sim] How to estimate performance of HVAC system in
life cycle analysis?</span><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>Jim:<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>I don't have the reference right in
front of me, but I believe the ASHRAE HVAC Systems has a table for useful life.
Also the California Energy Commission. But my references are at work. Reemail
me at <a href="mailto:jaulbach@ptrenergy.com" target="_blank">jaulbach@ptrenergy.com</a>
to emind me, and I shall look them up for you.<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>John Aulbach<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Jin Minming
<jminming@yahoo.com><br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Sent:</b> Mon, February 15, 2010 3:42:12 AM<br>
<b>Subject:</b> [Bldg-sim] How to estimate performance of HVAC system in life
cycle analysis?</span><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>Hello all,<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><br>
In life cycle analysis of buildings, it seems it is very hard to estimate
long-term performance of HVAC systems (or other building components), for
example, air handling units, chiller, or boilers. It makes sense
that HVAC system will degrade with time, depending on many factors, like
maintainence, wear-and-tear. The problem is how to quantify these change
with time. Maybe some probabilstic or scenario methods can be used. Would you
please tell me the common method to predict these performance change or where I
can find some good references about this topic?<br>
<br>
Thanks,<br>
<br>
Jim Terrry <o:p></o:p></p>
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