Aaron,
Beyond building a roof monitor in eQuest, be very careful of the
lighting calculation engines. It is my understanding that they are no
more complicated than a lumen method calculation with gives accuracy
only to an order of magnitude at best. Daylight Factors are definitely
the better way to go for accuracy.
Best wishes,
*Jill Dalglish, LEED AP BD+C*
Is there any way to obtain all the coefficients listed in APPENDIX C,
the methodology for the envelope trade-off calculations? Even better
would be a text file with all the equations and the coefficients.
>> Christopher Jones, P.Eng.
>From what I read in the users manual they are based on DOE2 calcs, so
possibly could get from there?
*Jeremiah D. Crossett*
FYI - Appdx c is being re-written, for 90.1-2013. When I get back to internet connectivity I can give you the addendum letter. The goal was to streamline the baseline building generation, even automate it.
As for the current Appdx c their is no document u seek that I know exists. But it reads pretty clearly, ( as everything feeds into one equation ) so I would just go all old school and write them down. It's only about 10 or 15 or so.
Sent from my HTC on the Now Network from Sprint!
----- Reply message -----
You are likely correct, I can select, copy and paste all the
equations and coefficients from Appendix C into a text
document. Then it's a matter of creating a spreadsheet or Perl
program to do the calculations.
I have been using ENVSTD for years. The problem
is that the Ontario Building Code has revised the
envelope prescriptive requirements to hybrid
values that are not matched by the current and
past versions of ENVSTD. Ideally one would get
the source code and modify the lookup tables then
recompile but I am not having any luck with that concept.
I have heard that the the ENVSTD developers are
working on a version for Ontario but who knows
how long that might take. In the meantime, the
cost of building permits goes up on July 12 so
lots of developers are scrambling to get permits before then.
If I'm not mistaken, the trade-off approach is what COMcheck's (free software) is built around for envelope compliance calculations. Don't believe it gets much easier ;).
NICK CATON, P.E.
Just a quick side note on this ? the EnvStd software is not included in the 90.1-2010 User?s Manual. The last one offered was EnvStd 6.0, published with the 90.1-2007 User?s Manual.
Regards,
Larry O. Degelman, P.E., HBDP, BEMP
Again the problem wit COMcheck is the prescribed envelope
characteristic don't match the new Ontario Building Code values. It
is unfortunate that COMCheck and ENVSTD have those values hard
coded. It would have been great if those programs had been
constructed with a database that was open for revision based on the
local jurisdictions requirements.
I have found a volunteer to help develop a WEB based solution. Don't
hold you breath, it is a spare-time project.
>> Christopher Jones, P.Eng.
Hi Chris,
If it's any help, I understand COMcheck is still being actively updated as I get notifications pretty often re: updates. Considering COMcheck is inclusive of a fairly wide range of standards, some of which are state/locality-specific, you might find the folks responsible for updating/developing the software receptive to including another set of prescriptive standards if you ask the question.
Best of luck!
NICK CATON, P.E.