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1. i would recommend obtaining 90.1-2001 and 2004 as the
requirements of 2001 and the methodologies of 2004 differ from 2010.<br>
2. don't forget 179d requirements over-ride requirements of 90.1.<br>
3. do you have the 179d energy simulation guide? this one is free
from the nrel website. 40467.pdf is the name of it.<br>
4. the irs bulletins on the revisions for partially qualifying have
changed over the years. most recently (02/12) with an option to use
two different percentage sets if the building is not fully
qualifying until 12/31/2013. i.e. 10% building, 15% hvac/swh, 25%
lighting OR 10% building, 20% hvac/swh, 20% lighting. the old
16-2/3% for each discipline expired at the end of 2008.<br>
5. and if you're looking at partially qualifying don't forget a
partially qualifying is each discipline by itself so you can't have
a partially qualifying hvac/lighting only or hvac/arch. it would be
one simulation partially hvac, another partially bldg, or lighting.
and in the case of lighting you can use the interim lighting rules
which doesn't require simulation.<br>
6. can't help you with the use of phase change materials.<br>
7. the simulations start the same between leed and epact but a)
you'll see more savings with epact, b) the baseline requirements are
different (see the 179d simulation guide), and MOST importantly the
179d certification is a certification of what is installed on the
project. i.e. who is field verifying what is there? you are. and
you're certifying this to the irs. this can make a large difference
as far as hvac due to your having field measure fan flow, motor
volts, and motor amps used. as these should be less than nameplate
data you'll see more energy savings. yes, i realize some of the
language in 179d reads equipment "that will be installed" but if
you're using only catalog data (which can differ from nameplate) due
to trying to certify before the building is constructed you won't
see as much 179d savings. don't forget you're also certifying
building envelope installation and field measured lighting levels
(there are lighting contractors that can provide this) per the 179d
requirements. <br>
8. the 179d savings are an energy cost savings basis. you have to
break out the percent cost of energy used by each discipline from
the total cost of the building based on the percentage energy used
by each discipline. see page 9 of the 40467.pdf from nrel.<br>
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<img src="cid:part1.03050904.07020203@gmail.com" alt=""><br>
9. remember you're only comparing energy for building envelope,
hvac/swh, and lighting. as misc/other energies are energy neutral
they don't impact your savings directly (unlike in leed).<br>
10. solar pv savings do not apply to 179d, and neither does
external lighting (it's all internal lighting). we could have a lot
higher savings where i'm at if we could include external lighting
due to stringent site lighting reductions trying to keep our skies
dark and federally funded telescopes having great views. solar
thermal (swh) does apply.<br>
<br>
regardsl,<br>
<br>
On 12/1/12 2:44 PM, CleanTech Analytics wrote:
<blockquote
cite="mid:CALKTE9TPisD-0CLvPhUaVbp5vMu3Z-fDKj6ML=jD3cdMYtEUEQ@mail.gmail.com"
type="cite">Dear List-<br>
I am researching the EPAct §179D Energy Efficient Commercial
Buildings Tax Deduction, specifically the segment for $.60 per
square foot building floor area for building envelopes that
contribute to %50 better than ASHRAE 2001. The main question I
am attempting to figure out is if Phase Change Materials could be
used in conjunction with ASHRAE 90.1 2007 or 2010 prescriptive
insulation and fenestration requirements (or better) to achieve
the tax credit. The projects that this would apply to are
currently going for LEED but may not be going for EPAct. I am
trying to figure out how the envelope contribution to the %50
better than ASHRAE 2001 requirement is segmented to understand if
these projects could be applicable for the credit due to the
advanced Phase Change Material envelopes. <br>
<br>
I understand that the procedure to follow is ASHRAE 90.1 2004, and
the baseline to be 50% above is ASHRAE 90.1 2001.<br>
<ul>
<li> Question 1: Is the calculation for %50 reduction similar to
the LEED % of cost approach or if it is a % of energy basis?</li>
</ul>
The part I do not know is the multipliers to segment the envelope
only portion and associated modeling procedures. If this is based
on minimum R values and maximum U values than our product would
not contribute to the %50, while if it is based on %50 energy
reduction from the baseline envelope energy use than phase change
materials could contribute to the credit and receive the $.60 per
square foot building area.<br>
<ul>
<li>Question 2: How is the envelope segmented from the HVAC and
lighting systems when applying for envelope only EPAct?</li>
</ul>
I have a budget to buy any required literature, but do not want to
misuse funds by buying unnecessary publications.<br>
<ul>
<li>Question 3: Should I get ASHRAE 90.1 2001 and ASHRAE 90.1
2004, or can I find this info in the ASHRAE 2010 version I
already own? </li>
<li>Question 4: Is there any other reference materials that are
advised (free or purchased) to better understand EPAct rules
and requirements?</li>
</ul>
Thank you in advance to anyone who shares their insights..
<br>
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