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<DIV><FONT face=Arial size=2><SPAN class=049000818-18042006>I am looking for
some guidance from ASHRAE 90.1 modelers. I have a couple of
projects in Chicago where the proposed system is comprised of ground
loop-coupled water-to-air heat pumps. My question is regarding
compliance with ASHRAE 90.1-1999 ECB method (the projects are to be LEED
v2.1 certified). I am using eQuest v3.55. Given that we are using
the ground loop and this is a non-residential multi-zone project,
I have to use the ECB Budget System 6 (constant volume Water-source
heat pumps with DX cooling and boiler heating) as the Budget System. That
seems straight forward, except that I am not sure how to handle heat rejection
from the condenser/DX coil on the heat pumps for a small building
given the limited guidance in 90.1-1999. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=049000818-18042006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=049000818-18042006>In most cases I
would use a cooling tower for heat rejection from the condenser loop
as the Budget System. Has anyone had successfully proposed using a
cooling tower/fluid cooler for the ECB Budget System 6 for a relatively
small system (less than 12 tons of cooling load) with the USGBC? It
seems like overkill to me to use cooling tower with an additional pump and head
loss, and the percent of energy saved over the GLHP system reflects that.
I know that Appendix G's Budget System in my case would be a packaged HP
with an air-cooled condenser for rejection. But I want to find out if
there is any precedent for the heat rejection for 90.1-1999's Budget System
6. Any help you could give me would be great.</SPAN></FONT></DIV>
<DIV> </DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2>Patrick Dolan</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Serena Sturm Architects,
Ltd.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>3351 Commercial Ave.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Northbrook, IL 60062</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>847-564-0370, ext. 24 voice</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>847-205-5089, fax</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV><PRE>
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