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<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008><FONT face=Arial
color=#0000ff>Dan,</FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008><FONT face=Arial color=#0000ff>I passed your note over
to some experienced UFAD mechanical engineers (they have done many projects with
UFAD that met LEED and ASHRAE 62.1).</FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008><FONT face=Arial color=#0000ff>The response is
below. I hope this helps some!</FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008><FONT face=Arial
color=#0000ff>John</FONT> </SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT face=Arial color=#0000ff
size=2><SPAN class=923271114-05112008></SPAN></FONT></FONT> </DIV>
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</SPAN></FONT></DIV></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=923271114-05112008> </SPAN><STRONG>Sent:</STRONG> Tuesday, November
04, 2008 4:15 PM<BR><B>Subject:</B> RE: ASHRAE 62.1 Compliance with
Underfloor-Air Distribution<BR></DIV></FONT></FONT>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">A combination of
factors and options must be considered. Most UFAD systems include large open
office areas, for which C02 monitoring can be applied, and there is a
non-trivial amount of general leakage of supply air through the floor and the
diffusers, even in minimum settings. Depending on the UF plenum pressure and the
floor and carpet systems used, this may be 0.25 CFM per SF, beyond what the
diffusers provide at their minimum. Some UFAD diffusers have definable minimum
stops, and some (e.g. the Titus TAF-LV system) can be designed and controlled to
provide a minimum aperture area, which, in conjunction with known underfloor
plenum pressures, can provide defined amounts of supply
air.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
bldg-rate-bounces@lists.onebuilding.org
[mailto:bldg-rate-bounces@lists.onebuilding.org] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Dan Russell<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, November 04, 2008 11:07
AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
bldg-rate@lists.onebuilding.org<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Bldg-rate] ASHRAE 62.1 Compliance
with Underfloor-Air Distribution</SPAN></FONT><FONT face="Times New Roman"
size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">Hello
All,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">I am
struggling with determining how the common UFAD systems today are meeting ASHRAE
62.1. The systems which I have seen utilize floor grilles with either a
motorized damper controlled via wall-mounted t-stat or a manual damper.
When the space is satisfied the dampers close and all of a sudden there is no
supply air entering the space. This is also the case during all heating
modes I have observed in UFAD systems. During heating mode for these
systems the primary supply air is completely shut-off and the space is heated
using 100% re-circulated air from the space. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">I
recently attended a seminar by a UFAD manufacturer where one of the speakers was
a chief engineer for the company. After the seminar I posed this question
to him, only to have him respond by saying that it’s a tough issue to tackle and
he’s not sure how compliance would be met. I’ve also been told that since
heating only takes place on the perimeter that ventilation is drawn from
interior zones. I’ve also been told, “Well we generally only see corridors
on the perimeter of buildings with UFAD.” To my knowledge ASHRAE 62.1
doesn’t allow ventilation from interior zones to compensate for perimeter zones
that have little or no primary air flow. Also, ASHRAE 62.1 requires
ventilation in corridors anyways so this argument seems to be just as
weaselly. ASHRAE 62.1 requires zones to be adequately ventilated during
all load conditions, which includes no load or heating
load<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">UFAD
seems to be touted as the Messiah of multi-story office HVAC, but the lack of
ventilation air appears to be a glaring omission. Am I missing something
about these systems? <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">Does
anyone know how to design a UFAD system that complies with ASHRAE 62.1?
Surely there have been several successful LEED certifications for projects
utilizing UFAD technology; does anyone know if the USGBC has given
guidelines for this issue?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=4><SPAN
style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </SPAN></FONT><FONT
face=Cheltenham color=#a0002f size=5><SPAN
style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan Russell,
EIT <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></SPAN></FONT></P>
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id=Picture_x005f_x0020_1 height=174 alt=cid:image001.jpg@01C840A4.E711B250
src="image001.jpg" width=200></SPAN></FONT><o:p></o:p></P>
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