<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=text/html;charset=iso-8859-1 http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.7600.16444"></HEAD>
<BODY style="PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: 15px"
id=MailContainerBody leftMargin=0 topMargin=0 CanvasTabStop="true"
name="Compose message area">
<DIV><FONT size=2 face=Arial>Hello Dan,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>You are correct to use Watts for the SI
equation. The counterpart equation for the PTHP (cooling mode, new
construction) in the IP version is [12.3 - (0.213 x Cap/1000)], but is expressed
as EER (not COP.) COP's are expressed for heating mode as [3.2 - (0.026 x
Cap/1000)]. That lower coefficient (0.026) softens the Cap/1000 value,
when Cap is in Btu/h.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>LOD</FONT></DIV>
<DIV><FONT size=2 face=Arial>===========================<BR>Larry O. Degelman,
P.E.<BR>Professor Emeritus of Architecture<BR>Texas A&M
University<BR>===========================</FONT></DIV>
<DIV style="FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=djestico@hilsonmoran.com
href="mailto:djestico@hilsonmoran.com">Dan Jestico</A> </DIV>
<DIV><B>Sent:</B> Tuesday, December 01, 2009 10:34 AM</DIV>
<DIV><B>To:</B> <A
title="mailto:Bldg-sim@lists.onebuilding.org CTRL + Click to follow link"
href="mailto:Bldg-sim@lists.onebuilding.org">Bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV><B>Subject:</B> [Bldg-sim] ASHRAE 90.1-2004 Packaged Terminal Heat Pump
Efficiencies</DIV></DIV></DIV>
<DIV><BR></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>Afternoon
all,</FONT></SPAN></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>We're trying to
obtain the minimum CoP for a Packaged Terminal Heat Pump in cooling mode for a
new construction using table 6.8.1D in ASHRAE 90.1-2004 (SI edition) and the
formula is proving to be somewhat confusing. In the SI edition it is described
as </FONT></SPAN></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>[3.60 - (0.213 x
Cap/1000)]</FONT></SPAN></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>Is this the same
equation as listed in the imperial edition of 90.1-2004? If the max. unit
capacity of 4.4kW is converted to Btu/hr (approx 15024 Btu/hr, as per note c)
and input to the formula, the minimum CoP is only 0.4, which seems very low.
However, if I use the value in Watts in the equation, the minimum CoP comes out
as a much more reasonable 2.66. </FONT></SPAN></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>I can't seem to find
any addenda on ASHRAE's website or additional guidance on this matter and would
very much appreciate any guidance you can provide.</FONT></SPAN></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2 face=Arial>Many thanks for your
help.</FONT></SPAN></DIV>
<DIV><SPAN class=645462016-01122009><FONT size=2
face=Arial><BR>Dan.</FONT></SPAN></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV align=left>
<DIV align=left>
<DIV style="TEXT-ALIGN: left; FONT-FAMILY: Arial; FONT-SIZE: 12pt"
align=left>DAN JESTICO </DIV>
<DIV
style="TEXT-ALIGN: left; FONT-FAMILY: Arial; COLOR: #808080; FONT-SIZE: 10pt"><FONT
color=#000000></FONT> </DIV>
<DIV
style="TEXT-ALIGN: left; FONT-FAMILY: Arial; COLOR: #ce0000; FONT-SIZE: 10pt">HILSON
MORAN</DIV>
<DIV style="TEXT-ALIGN: left; FONT-FAMILY: Arial; FONT-SIZE: 12pt"> </DIV>
<DIV
style="TEXT-ALIGN: left; FONT-FAMILY: Arial; COLOR: #008000; FONT-SIZE: 8pt">Members
of the Italian, Emirates, U.K. and U.S. Green Building Councils</DIV>
<DIV style="TEXT-ALIGN: left; FONT-FAMILY: Arial; FONT-SIZE: 12pt"> </DIV>
<DIV style="TEXT-ALIGN: left; FONT-FAMILY: Arial; FONT-SIZE: 12pt">
<TABLE style="FONT-SIZE: 8pt" cellSpacing=0 cellPadding=0>
<TBODY>
<TR>
<TD><FONT size=1>Direct Dial:<S td></S> </FONT>
<TD style="PADDING-LEFT: 10px">
<DIV><FONT size=1>+44 (0)20 7940 8884</FONT></DIV></TD></TR>
<TR>
<TD>
<DIV><FONT size=1>Mobile:</FONT></DIV>
<DIV><FONT size=1>London:</FONT></DIV></TD>
<TD style="PADDING-LEFT: 10px">
<DIV><FONT size=1>+44 (0)7595 106 614</FONT></DIV>
<DIV><FONT size=1>+44 (0)20 7940 8888</FONT></DIV></TD></TR>
<TR>
<TD colSpan=2><A style="COLOR: #ce0000"
title="http://www.hilsonmoran.com/ blocked::http://www.hilsonmoran.com/"
href="http://www.hilsonmoran.com/">www.hilsonmoran.com</A></TD></TR></TBODY></TABLE>
<DIV style="FONT-SIZE: 12pt"> </DIV>
<DIV style="COLOR: #808080; FONT-SIZE: 8pt"><STRONG>Please consider the
environment before printing this email.</STRONG></DIV>
<DIV style="FONT-SIZE: 8pt"> </DIV>
<DIV style="COLOR: #808080; FONT-SIZE: 8pt">Registered No: 1233447 England.
Registered Office: One Discovery Place, Columbus Drive, Southwood West,
Farnborough, Hampshire GU14 0NZ</DIV>
<DIV style="FONT-SIZE: 12pt"> </DIV>
<DIV style="COLOR: #c0c0c0; FONT-SIZE: 8pt">This message is for the named
person(s) use only and may contain confidential, proprietary or legally
privileged information. No confidentiality or privilege is waived or lost by
erroneous transmission. If you receive this message in error, please immediately
delete it and all copies of it from your system, destroy any hard copies of it
and notify the sender. You must not, directly or indirectly, use, disclose,
distribute, print, or copy any part of this message if you are not the intended
recipient. Hilson Moran Partnership Ltd reserves the right to monitor all email
communications through its networks. Any views expressed in this
message are those of the sender, except where the message specifically
states them to be the views of Hilson Moran Partnership Ltd. All transmissions
are checked for viruses but all recipients are advised to undertake their own
virus checks as Hilson Moran Partnership Ltd will not take responsibility for
any damage arising from virus infections.</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV> </DIV><BR>______________________________________________________________________<BR>This
email has been scanned by the MessageLabs Email Security System.<BR>For more
information please visit http://www.messagelabs.com/email
<BR>______________________________________________________________________<BR>
<P>
<HR>
<P></P>_______________________________________________<BR>Bldg-sim mailing
list<BR>http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org<BR>To
unsubscribe from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR></BODY></HTML>