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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In addition to Eddie’s comments, I
would advise referring to manufacturer’s documentation for heat pump
performance. Performance varies by brand, model, capacity, and ambient
conditions. I have experience with several heat pumps operating well into the
teens. Others claim they can perform well below zero. Capacity charts and performance
curves will tell you what the capacity is at various conditions. For the
purposes of your model, I would ensure that you are using performance curves reflective
of the equipment you intend to install in your room.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-<st1:City w:st="on"><st1:place w:st="on">Gary</st1:place></st1:City><o:p></o:p></span></font></p>
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<p><st1:PersonName w:st="on"><b><font size=1 color=navy face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:navy;font-weight:bold'>Gary
Schrader</span></font></b></st1:PersonName><font size=1 color=navy face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:navy'> | </span></font><b><font
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<b><span style='font-weight:bold'>Energy Solutions </span></b>| <b><span
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<b><span style='font-weight:bold'>Phone:</span></b> +1 913 217 8068 | <b><span
style='font-weight:bold'>Fax: </span></b>+1 913 469 0206<br>
<b><span style='font-weight:bold'>Email: </span></b><a
href="Mailto:gary.schrader@buildings.schneider-electric.com">gary.schrader@buildings.schneider-electric.com</a>
| <b><span style='font-weight:bold'>Site: </span></b><a
href="http://www.schneider-electric.com/buildings">www.schneider-electric.com/buildings</a>
| <b><span style='font-weight:bold'>Address: </span></b><st1:address w:st="on"><st1:Street
w:st="on">16011 College Boulevard, Suite 212</st1:Street>, <st1:City w:st="on">Lenexa</st1:City>,
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Eddie Corwin<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, November 04, 2010
2:17 PM<br>
<b><span style='font-weight:bold'>To:</span></b> deepika khowal; equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] PTAC
and PTHP</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><span class=apple-style-span><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>A heat pump are a MUCH
more efficiency way of heating. The only issue with heat pumps
are that they do not work well in cold weather (<40*F) below this
temperature, they are pretty much electric resistance heaters. A lot of
improvements have been made, for example, the Mitsubishi Citi
Multi-Split systems can operate at temperatures as low as 13*F. For
these types of systems, they operate as Heat pumps at 40*F and above.
At 40*F and below, they use electric resistance heat to warm the air
flowing over the outdoor unit (allowing for heat transfer between the air
and the refrigerant). So once you get down to 13*F they start to use
a lot of electric resistance heating. Still much better that pure
electric resistance heating!</span></font></span><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>-Eddie<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'> deepika khowal
<deepika.khowal@gmail.com><br>
<b><span style='font-weight:bold'>To:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thu, November 4, 2010
2:52:38 PM<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] PTAC and
PTHP</span></font><font color=black><span style='color:black'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>HI <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I am trying to model a room with 80%
glazing which has a wall unit air conditioner.<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>what will be the difference PTAC using
electric heat / heat pump for heating ?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>which one is advisable in terms of
efficiency and energy savings?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>does anyone has any thought on this?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Thanks<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Regards<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Deepika<o:p></o:p></span></font></p>
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