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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">Thanks
for your input on HRV versus ERV.<SPAN style="mso-spacerun: yes"> </SPAN>I
really enjoyed the discussion that followed concerning the health impact of
humidity.<SPAN style="mso-spacerun: yes"> </SPAN>I gained new knowledge
from that series.<SPAN style="mso-spacerun: yes"> </SPAN><?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; COLOR: black; FONT-SIZE: 16pt; mso-themecolor: text1"><A
title=steve@tjiang.org href="mailto:steve@tjiang.org"><SPAN
style="COLOR: black; TEXT-DECORATION: none; mso-themecolor: text1; text-underline: none">Steven
Tjiang</SPAN></A> writes:<o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">Your
analysis seem correct for your climate. If there is no active source of
moisture removal an ERV would only delay the inevitable equalization of humidity
between the external and the internal.<o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">I
have decided to install ERV, even though I am not immediately planning to
install the active moisture removal to take advantage of the ERV’s ability to
preserve that value.<SPAN style="mso-spacerun: yes"> </SPAN>I decided to
preserve the option of installing active moisture removal such as a mini-split
heat pump.<SPAN style="mso-spacerun: yes"> </SPAN>Living in a wooded
location, with upgraded thermal efficiency from tighter and higher conductive
insulation, I have the potential for grid tied photovoltaic array in field where
there is full sunshine to produce the electricity credits in summer to pay for
heat in winter.<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">The
next issue what ERV to use. <SPAN style="mso-spacerun: yes"> </SPAN>My
house is small.<SPAN style="mso-spacerun: yes"> </SPAN>Using ASHRAE
formula for required ventilation = (.01cfm/sf x Area(sf)) + 7.5cfm/occupant x
#occupants), I only need 22cfm.<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">Is
there a source of information for comparing the performance of various
manufacturers and models?<o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">Efficiency
of recovery and reliability are important factors.<SPAN
style="mso-spacerun: yes"> </SPAN>Rcomendations will be appreciated.<SPAN
style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">I
am considering <o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">*
Fanteck <B>5504.153 </B>SE 704N Compact ERV<o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">*
Panasonic ERV FV-04VE1<o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">*
Renew air model to be determined.<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">I
spoke with an engineer recently that recommended Renew Air Energy Recovery Flat
Plate HX.<SPAN style="mso-spacerun: yes"> </SPAN>He told me that some
ERV’s with desicant wheels have leakage between air flows and maintenance issues
caused by bearing and seal of wheel.<SPAN style="mso-spacerun: yes">
</SPAN>The ERV he recommended has some different method of transferring humidity
that flows over plates.<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 16pt">I
have an L shaped 36’x26’house with long leg 10’wide and short leg 24’wide.<SPAN
style="mso-spacerun: yes"> </SPAN>I am looking at installing HRV near
north wall in area common to both legs so a straight 4” duct can deliver fresh
air to opposite side of each leg.<SPAN style="mso-spacerun: yes"> </SPAN>A
parallel duct on one of the legs would deliver exhaust air to South side for
plenty of separation between inlet and outlet.<SPAN
style="mso-spacerun: yes"> </SPAN>Is there a disadvantage for having the
exhaust duct going 20’ through conditioned space?<SPAN
style="mso-spacerun: yes"> </SPAN>Would it be advantage to have the long
leg be the outdoor air supply instead.<SPAN style="mso-spacerun: yes">
</SPAN>I could send exhaust air out North side near inlet, but then continue to
open end to achieve the separation needed instead of crossing the house.<SPAN
style="mso-spacerun: yes"> </SPAN>I would like to use PVC pipe to insure
tightness.<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P></DIV></BODY></HTML>