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<p class=MsoNormal>Hello All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:Cheltenham;
color:#A0002F'> </span><span style='font-size:18.0pt;font-family:Cheltenham;
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><img width=200 height=174 id="Picture_x0020_1"
src="cid:image001.jpg@01C93E59.D22807A0"
alt="cid:image001.jpg@01C840A4.E711B250"></span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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