Dear Mr. Rick Routh,<br><br>You will have to assign one system type 3 to every zone in your building. <br><br>System type 3, as you point out, are single zone units, meaning they can only respond to one thermostat input. However, in ASHRAE 90.1 User's Manual, 2004 on page G-23 they say that "the baseline building HVAC system is a rooftop packaged system serving each thermal zone (or thermal block)." This allows you to group similar zones in your proposed building together, and you can assign your System type 3 to each block instead, speeding up the calculations for your model. However, your thermal blocks must be specified identically in your proposed and baseline building. Example G-H on page G-27 in the same User's Manual highlights this point.<br>
<br>For information on thermal blocks and how they are modeled in your proposed building, refer to ASHRAE 90.1 (the standard, not the user's manual), p 173, table G3.1 - 7. <br><br>I hope this clarifies your question, if not, feel free to contact me.<br>
<br>Sincerely yours,<br><br><br><b>Ulrik Welle-Strand Horn </b><br>Sustainability Engineer<br><div><br><b>Silpa Inc.</b><br><font size="1"><b>s</b> i m p l e . <b>s</b> c i e n t i f i c . <b>s</b> u s t a i n a b l e<br>
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<font size="1"><div>AMERICAS | MIDDLE EAST | ASIA<br>
<a href="http://www.silpainc.com/" target="_blank">www.silpainc.com</a><br></div><font size="2"><br></font></font><font size="2">India: +91.90080.96083</font><br><br><div class="gmail_quote">On Sun, Nov 2, 2008 at 11:06 PM, Routh Consulting Engineers <span dir="ltr"><<a href="mailto:routhconsultingengineers@charter.net">routhconsultingengineers@charter.net</a>></span> wrote:<br>
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<div><font size="2" face="Arial">I am modeling a new building applying for LEED
certification and want to make sure I'm using the right Appendix G baseline HVAC
system configuration. The proposed design has three gas/electric rooftop
packaged HVAC units, each with VVT dampers for subzoning, 6 to 12 subzones
per system, all zones are defined at the stage of design development we're at. I
believe I need Appendix G system type 3, gas/electric single zone units for my
baseline, but do I use the same three HVAC unit configuration and
assign the same eQUEST spaces/zones to the corresponding systems, or
do I use a separate HVAC system for each space/zone? Thanks in advance for
any replies.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Rick Routh</font></div>
<div><font size="2" face="Arial"></font> </div></div>
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