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<body class='hmmessage'><div dir='ltr'>Maybe I didn't elaborate this problem clearly enough. Here i'm repeating: the tank does't work below 0 degree no matter what charge/discharge rate i assign to it. I don't know if other guy've met the same problem too?  <BR>

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From: jenny.zhang@arup.com<BR>To: silver_mirror@msn.com; 503271081@qq.com; equest-users@lists.onebuilding.org; yjhuang@whiteboxtechnologies.com<BR>Subject: RE: [Equest-users] »Ø¸´£º RE: »Ø¸´£º[Equest-users ] Thermal storage tank doesn't work below zero degree<BR>Date: Fri, 31 May 2013 10:34:11 +0000<BR><BR><BR>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">I met the same problem. Maybe it is a bug of equest. If my memory is right, I think eQuest before 3.63 could do ice storage correctly.</SPAN></P>
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<P class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>From:</SPAN></B><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>WangWendy<BR><B>Sent:</B> 2013</SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>Äê</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>5</SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>ÔÂ</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>31</SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>ÈÕ</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US> 18:14<BR><B>To:</B> </SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>ÀäÃ溮ǹ</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>; Equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users] </SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>»Ø¸´£º</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US> RE: </SPAN><SPAN style="FONT-SIZE: 10pt" lang=ZH-CN>»Ø¸´£º</SPAN><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>[Equest-users ] Thermal storage tank doesn't work belo w zero degree</SPAN></P></DIV></DIV>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'">enclosed are the screenshot. You may see both the water side system and the propertites panel of storage tank. Charge temperature now is 32 F( 0 C) due to the reason i mentioned. Another two attachement are the screenshot of charge loop and discharge loop.<BR><BR> </SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'">From: <A href="mailto:503271081@qq.com">503271081@qq.com</A><BR>To: <A href="mailto:silver_mirror@msn.com">silver_mirror@msn.com</A>; <A href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR>Subject: <SPAN lang=ZH-CN>»Ø¸´£º</SPAN> RE: <SPAN lang=ZH-CN>»Ø¸´£º</SPAN>[Equest-users ] Thermal storage tank doesn't work belo w zero degree<BR>Date: Fri, 31 May 2013 17:59:53 +0800<BR><BR>can you provide the water side system screenshot in eQUEST or attach your inp and pd2 file in Email. </SPAN></P>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>·¢¼þÈË</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> "WangWendy"; </SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>·¢ËÍʱ¼ä</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> 2013<SPAN lang=ZH-CN>Äê</SPAN>5<SPAN lang=ZH-CN>ÔÂ</SPAN>31<SPAN lang=ZH-CN>ÈÕ</SPAN>(<SPAN lang=ZH-CN>ÐÇÆÚÎå</SPAN>) <SPAN lang=ZH-CN>ÏÂÎç</SPAN>5:54</SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>ÊÕ¼þÈË</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> "<SPAN lang=ZH-CN>ÀäÃ溮ǹ</SPAN>"; "<A href="mailto:Equest-users@lists.onebuilding.org">Equest-users@lists.onebuilding.org</A>"; </SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>Ö÷Ìâ</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> RE: <SPAN lang=ZH-CN>»Ø¸´£º</SPAN>[Equest-users ] Thermal storage tank doesn't work belo w zero degree</SPAN></P></DIV></DIV>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'">Of course I've set the maximum rate per design value. My problem here is the actual rate doesn't equal to the supposed value. As i mentioned below, the actual discharge/charge load/rate is zero when the entering/leaving temperature is below 0 degree. I don't think the problem comes from wrong setting of discharge/charge rate.<BR><BR>Any other possibility besides the charge/discharge rate?<BR><BR>Thank you all the same.<BR><BR></SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"><BR>From: <A href="mailto:503271081@qq.com" target=_blank>503271081@qq.com</A><BR>To: <A href="mailto:silver_mirror@msn.com" target=_blank>silver_mirror@msn.com</A>; <A href="mailto:equest-users@lists.onebuilding.org" target=_blank>equest-users@lists.onebuilding.org</A><BR>Subject: <SPAN lang=ZH-CN>»Ø¸´£º</SPAN>[Equest-users] Thermal storage tank doesn't work below zero degree<BR>Date: Fri, 31 May 2013 17:32:17 +0800<BR><BR></SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'">you must Specifies the maximum rateat which the storage component can discharge and discharge <SPAN lang=ZH-CN>¡£</SPAN></SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>·¢¼þÈË</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> "WangWendy"; </SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>·¢ËÍʱ¼ä</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> 2013<SPAN lang=ZH-CN>Äê</SPAN>5<SPAN lang=ZH-CN>ÔÂ</SPAN>31<SPAN lang=ZH-CN>ÈÕ</SPAN>(<SPAN lang=ZH-CN>ÐÇÆÚÎå</SPAN>) <SPAN lang=ZH-CN>ÏÂÎç</SPAN>2:55</SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>ÊÕ¼þÈË</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> "<A href="mailto:Equest-users@lists.onebuilding.org" target=_blank>Equest-users@lists.onebuilding.org</A>"; </SPAN></P></DIV>
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<P style="BACKGROUND: #efefef" class=ecxMsoNormal><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt" lang=ZH-CN>Ö÷Ìâ</SPAN></B><B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt">:</SPAN></B><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'; FONT-SIZE: 9pt"> [Equest-users] Thermal storage tank doesn't work below zero degree</SPAN></P></DIV></DIV>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Hello everyone</SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">This problem came across when I was modelling an ice-storage system. Hourly report said the charge and discharge load are both zero, which means the tank doesn¡¯t work under the setting condition. The supposed entering temperature of the tank is -6</SPAN><SPAN style="COLOR: #1f497d; FONT-SIZE: 11pt" lang=ZH-CN>¡æ</SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"> and is leaving at -3</SPAN><SPAN style="COLOR: #1f497d; FONT-SIZE: 11pt" lang=ZH-CN>¡æ</SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">. Freeze temp is below -10</SPAN><SPAN style="COLOR: #1f497d; FONT-SIZE: 11pt" lang=ZH-CN>¡æ</SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">. In order to run the simulation, I have to raise the charge/discharge temperature as well as the loop temperature of charge loop up above 0</SPAN><SPAN style="COLOR: #1f497d; FONT-SIZE: 11pt" lang=ZH-CN>¡æ</SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">. When the charge temperature is above or  equal to zero, the tank does work. However it changes the performance of double duty chillers under ice-making mode, since the curve of chiller is different with different leaving temperature, leading to a bigger assigned load of double duty chiller than the max charge load and less accurate results.</SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"> </SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Does anyone have any thoughts how to solve this problem? Making storage tank work below 0</SPAN><SPAN style="COLOR: #1f497d; FONT-SIZE: 11pt" lang=ZH-CN>¡æ</SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"> at setting temperature? Or is this the limit of eQuest software yet to be solved?</SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"> </SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Many thanks</SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P>
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<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Wendy</SPAN><SPAN style="FONT-FAMILY: '΢ÈíÑźÚ','sans-serif'"></SPAN></P></DIV></DIV></DIV></DIV></DIV></DIV>
____________________________________________________________<BR>Electronic mail messages entering and leaving Arup  business<BR>systems are scanned for acceptability of content and viruses<BR></DIV>                                       </div></body>
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