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<p class=MsoNormal>Does anyone know of a way to make part load operation work
in Type668?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The performance maps are based on entering conditions on the
evaporator and condenser side. However, there is no direct way to make type668
run at 10%, 50%, etc.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The work around I have used in the past is dividing the
performance map by 50% to reflect two stages of operation and so on. Then
setting up valves and controls to route the flow correctly. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The HP I am modeling has a 10:1 turn down ratio and I don’t
want to make 10 heat pumps each with 10% of the total capacity of a single
unit. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Please advise,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Fred<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;color:#660000;text-transform:uppercase'>Fred Betz</span></b><b><span
style='font-size:9.0pt;color:#333333'> </span></b><span
style='font-size:9.0pt;color:#333333'>PhD., LEED AP <br>
</span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>Sustainable
Systems Analyst</span><span style='font-size:9.0pt;color:#333333'><o:p></o:p></span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:9.0pt;color:#660000'>AEI</span></b><span style='font-size:
9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>
5802 Research Park Blvd. | Madison, WI 53719<br>
<br>
</span><span style='font-size:9.0pt;color:#660000'>P: 608.236.1175 | F:
608.238.2614</span><span style='font-size:9.0pt;color:#333333'> <br>
</span><span style='font-size:9.0pt;color:#660000'><a
href="mailto:fbetz@aeieng.com"><span style='color:#660000;text-decoration:
none'>fbetz@aeieng.com</span></a> | </span><b><span
style='font-size:9.0pt;color:#660000'><a href="http://www.aeieng.com/"><span
style='color:#660000;text-decoration:none'>www.aeieng.com</span></a></span></b><span
style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p>
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