<DIV>Dear Martin,</DIV>
<DIV>I think the findings may be correct.</DIV>
<DIV>First, for a TES system the leaving chilled water temperature usually will be lower, so the COP will be deduced, but as the outside temperature is lower, it does not deduced alot.</DIV>
<DIV>Second, if the TES system using brine water, i think the efficiency will reduce more.</DIV>
<DIV>As our experience in some project in Hong Kong and Mainland, TES system can only reduce electricity cost due to tariff rate rather than consumption.</DIV>
<DIV>I hope these comment would help.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV>Ernest Tsang</DIV>
<DIV>Meinhardt (M&E) Ltd</DIV>
<DIV><BR><BR><B><I>Martin Yip <yipch@emsd.gov.hk></I></B> wrote:</DIV>
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<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US">Dear Bldg-<SPAN class=SpellE>sim</SPAN> Subscribers,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US">I recently simulated an air cooled chiller plant with cold water tank thermal energy storage using DOE 2.2. <SPAN style="mso-spacerun: yes"> </SPAN>I originally expected some energy saving due to improve chiller COP at night charging the storage when compare it with a system without storage.<SPAN style="mso-spacerun: yes"> </SPAN>However, the results showed an energy penalty of a few percentages even though hourly data actually showed COP improvement during charging. <SPAN style="mso-spacerun: yes"> </SPAN>I have already set the loss coefficient to zero for the TES.<SPAN style="mso-spacerun: yes"> </SPAN>I should be most grateful if anyone can comment on this issue and provide some suggestion.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US">Engineer<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=1><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-US">EMSD, HKSAR<o:p></o:p></SPAN></FONT></P>
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