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<p><font size="2">Mike,</font><br>
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<font size="2">You would keep your CUH's for heating, and you would only zero-out your </font><b><font size="2">heating coils</font></b><font size="2">, not cooling coils (in your design case only). You would keep both coils operating in your baseline case. Thinking about it further I would not create a VAV heating plant for your design (I'm not sure if Trace automatically creates one or if your require to create it in Trace). I would just assign the heating systems to the CUH heating plant. In Trace, your fans will cycle when occupancy is at 5% or above, realistically, if your occupancy is never at 5% your fans will not turn on due to occupancy. However they will cycle with load - which is how you want the system to operate anyway. And for a warehouse I'm guessing there isn't much going on in most of the place anyway, so setup your thermal zones / rooms so you have your storage area separate from the loading dock and offices and you should set yourself up pretty well. </font><br>
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<font size="2">Be sure to use good insulation on the walls and roof, 90.1 calls out for continuous insulation, for a warehouse I'm assuming your going to be using steel stud construction, I'd double check the arch's U, and SC values against what the minimum are in the arch section of 90.1. Another thing - if your lights are all on a time clock or occupancy sensors, you can take a 10% credit in lighting power (I've found this little credit is something that is often overlooked, it's the last table in the standard). </font><br>
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<font size="2">Good luck.</font><br>
<font size="2">-Shariq<br>
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<img src="cid:20__=0ABBFF4DDFE8AE268f9e8a93df93@urscorp.com" width="16" height="16" alt="Inactive hide details for Mike Kennedy <consumer@madronagrove.com>"><font size="2">Mike Kennedy <consumer@madronagrove.com></font><br>
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<ul><b><font size="2">Mike Kennedy <consumer@madronagrove.com></font></b><font size="2"> </font>
<p><font size="2">06/23/2009 06:22 PM</font><br>
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<div align="right"><font size="2">To</font></div></td><td width="100%"><img src="cid:40__=0ABBFF4DDFE8AE268f9e8a93df93@urscorp.com" border="0" height="1" width="1" alt=""><br>
<font size="2">Shariq_Ali@URSCorp.com, bldg-sim@lists.onebuilding.org</font></td></tr>
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<font size="2">Re: [Bldg-sim] Bldg-sim Digest, Vol 19, Issue 20</font></td></tr>
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<font size="2">Shariq Ali,<br>
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Can you really say you are modeling cooling in the base and proposed cases if you set the cooling capacity to zero? <br>
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Mike<br>
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At 12:31 PM 6/23/2009, Shariq_Ali@URSCorp.com wrote:<br>
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<ul><font size="2" face="Courier New">Robby - the fans must cycle with occupancy, and then when the space is not occupied the must cycle with load. They can not cycle with load only. For Mike Kennedy's system he would need to model the baseline with VAV heating and cooling. And also model the same system in the proposed, however you could set the heating coil capacities to zero, not create a heating plant, or not assign any systems to the heating plant for the VAV system. (This is if you are using Trace 700).</font><br>
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Good luck.</font><br>
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-Shariq Ali</font><br>
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