<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Jeff:<br><br>ASHRAE 90.1 allow spaces of similar thermal characteristics to be combined in thermal blocks. I do not include what you call support spaces because the load and occupancy is much different than, say a classroom. I would define the corridor as a separate zone within the thermal block but served by the same HVAC system. This allows you to have a different set-point, airflow, occupancy and schedules for the corridor.<br><br>You do not have to define a separate shell for each block, you can define the block by custom zones in the wizard.<br><br>I divide up a thermal block into as many reasonable zones as possible. This allows me to find out which area of the thermal block is causing any unmet heating or cooling hours. It also allows me to change the HVAC
system control zone to that zone which is the hardest to satisfy in the summer and winter. These zones can be served by a single HVAC system.<br><br>For a proposed model that needs to conform to an actual design, defining multiple zones per thermal block allows you to balance the airflow to zones that have unmet hours without increasing the overall airflow of the HVAC system. I define the zonal airflow in the Zone tab. I reduce the airflow to the zones without any unmet hours and increase the airflow to those zones that have unmet hours. I do not define the total fan CFM in the Airside Systems tab.<br><br>What were the comments from the LEED reviewer?<br><br>Paul Diglio<br><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight:
bold;">From:</span></b> Jeff Ross-Bain <jeff@rbgb.com><br><b><span style="font-weight: bold;">To:</span></b> equest-users <equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Wed, May 4, 2011 9:05:15 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] Thermal Blocks<br></font><br>
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">Hi All,</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">Are there any additional discussions out there regarding
thermal blocks besides what is in ASHRAE Standard 90.1 and the User’s
Guide? I have received comments back from a LEED reviewer that seems to reflect
an interpretation of that concept which I have not seen before.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">In a nutshell, does each thermal block require a separate
shell with individual HVAC system? I understand the concept of having individual
thermal blocks or combining these if they are similar space use categories. I
am assuming then that the similar space use categories (say a college classroom
building) can also include support spaces such as corridors, storage spaces,
faculty offices, etc. </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">So if several thermal blocks are combined into one, can they
not be served by a single, similar type of HVAC system?</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">I hope that I have made myself clear and many thanks for
your thoughts and comments.</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy;">Regards,</span></font></p>
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<p class="MsoNormal"><b><font color="#006e78" face="Century Gothic" size="1"><span style="font-size: 7.5pt; font-family: "Century Gothic"; color: rgb(0, 110, 120); font-weight: bold;">Jeffrey G Ross-Bain, PE, LEED AP, BEMP</span></font></b><font color="navy" face="Times New Roman" size="3"><span style="font-size: 12pt; font-family: "Times New Roman"; color: navy;"></span></font></p>
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