Hi Ramana,<br><br>The ASHRAE Appendix G modeling protocol requires that both heating and cooling be modeled for the entire building in both the Baseline and Proposed design, even if no heating or cooling is included in the actual design (see Appendix G,
TableG3.1.10 (Proposed)). <br><br>According to Table G3.1.4 (Proposed), you may model the indoor fans in the Proposed Design as cycling to show some benefit from natural ventilation, while your budget case fans would be modeled as continuous during occupied hours. As far as I can tell, this is the only thing you can do to reflect any energy savings from natural ventilation using the Appendix G modeling methodology.
<br><br>Best Regards,<br>Gail Stranske<br>CTG Energetics, Inc.<br><br><br><br><div><span class="gmail_quote">On 12/18/06, <b class="gmail_sendername">Ramana Koti</b> <<a href="mailto:ramana.koti@gmail.com">ramana.koti@gmail.com
</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Dear all,<br><br>Is ignoring natural ventilation in both proposed and baseline designs an accepted/fair way of modeling based on Appendix G (ASHRAE
90.1-2004)?<br><br>Part of the proposed design has (radiant heating + natural ventilation) with no cooling which was modeled as a radiant slab, no cooling, natural ventilation ignored.
<br><br>But the Baseline HVAC system based on Appendix G is System 5: Packaged VAV w/Reheat. (Natural ventilation can be modeled based on Air Change method or Sherman Grimsrud method though I do not know how to do it).<br>
<br>I cannot decide how to make the baseline and proposed comparable with respect to Natural Ventilation (in a manner acceptable to LEED review), suggestions will be appreciated.<br><br>Thanks,<br><br>Ramana Koti, Sustainable Building Analyst
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