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<DIV>Dear colleague:</DIV>
<DIV> </DIV>
<DIV><FONT face=宋体 size=2> <FONT
face="Times New Roman" size=3>I have met a serious problem during LEED a
factory.</FONT></FONT></DIV>
<DIV><FONT><FONT><FONT face=宋体 size=2>
</FONT>
<DIV><FONT face=宋体 size=2> <FONT
face="Times New Roman" size=3>For this project, There equipped some
HL-600G&HL-600 Gravity type skylight ventilator on the factory roof and some
operable window at the surrounding walls. But the height of the ventilator is
from 10.5m to 13m over the ground surface.</FONT></FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV>
LEED/ASHRAE 62 requirment: Natural ventilation spaces shall be
permanently open to and within 8m of operable wall or roof opening to the
outdoors. </DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV> Assume the
breathing zone is 1.6m high, So LEED accept height of the ventilator
should be lower than 9.6(1.6+8)m. So the interior area(more than 8 m away from
surrounding walls) does not have valid natural ventalition system as described
by LEED/ASHRAE.</DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体
size=2> </FONT></DIV></FONT></FONT></DIV>
<DIV> The
designer does not agree our opinion, their reason:</DIV>
<DIV> </DIV>
<DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=827563803-10042008>1. the design is to give comfort to
the operators on the floor since the process equipment is very hot and the space
within the 8-m high will get unbearably hot. Nanjing is known for its hot
summers</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=827563803-10042008>2. the specification is for 22 air
changes per hour (ACPH) and the need for 8-m floor to roof eave height is to aid
natural draught ventilation so it is easier to reach 22 ACPH</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=827563803-10042008>3. The supplier is to warrant 22 ACPH
and provide ASHRAE calculations to reach this figure.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=827563803-10042008>4. It is less acceptable to fill the
roof area with mechanical roof ventilators since it is energy dependent (an
increase in the carbon footprint) and as such agaist the LEED
concept</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=827563803-10042008>5. The approach is within the
philosophy of LEED in that the operators comfort and well being is at the heart
of this design, the use on natural ventilation address sustainable design in
that no energy is required to get 22 ACPH.</SPAN></FONT></DIV></DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体 size=2> <FONT face="Times New Roman"
size=3>QUESTION: 1. Are the designers reason will be agreed by
LEED?</FONT></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=宋体
size=2> <FONT
face="Times New Roman" size=3> 2. If we installed some exhaust fan on
the roof, makeup air will go in through operable windows on the surrounding
walls. whether the ventalition system changed to mechanical ventalition system
as defined by ASHRAE/LEED?</FONT></FONT></DIV>
<DIV> </DIV>
<DIV> Any further suggestion is highly appreciated. </DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
<DIV>Ziqiang Chen<BR> <BR>Project
Engineer<BR> <BR>EMSI<BR> <BR>86-21-54962727
TEL<BR> <BR>86-21-64435767 FAX<BR> <BR><A
href="mailto:zqchen@emsi-green.com.cn">zqchen@emsi-green.com.cn</A><BR> <BR><A
href="http://www.emsi-green.com">www.emsi-green.com</A><BR> <BR></DIV>
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