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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>I
would like to start a forum on modeling ice storage.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>I
have had many problems when modeling an ice storage system in eQUEST. I first crate
a thermal storage tank and attach it to the chilled water loop. Then I set the operating
temperatures and attach a charging schedule. I also input the Capacity Ratio, (When
CAPACITY is defaulted, accepts a numeric value that acts as a multiplier on the
loop's design hourly load. The default is one hour's load) since I want the
tank to discharge for 6 hours I input a ratio of 6.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><img
width=460 height=343 id="_x0000_i1025" src="cid:image001.jpg@01CA5DFC.14F20EB0"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>My
next step is to create equipment controls for the chilled water loop. The following
image is of the <st1:place w:st="on"><st1:PlaceName w:st="on">Load</st1:PlaceName>
<st1:PlaceType w:st="on">Range</st1:PlaceType></st1:place> control:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><img
width=455 height=339 id="_x0000_i1027" src="cid:image002.jpg@01CA5DFC.14F20EB0"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>The
results of this shows a realistic cost savings but the energy consumption does
not make sense. The cooling consumption decreases significantly (I would have
expected it to slightly increase) and the heating energy consumption is
affected (the heating energy consumption should not be effected by the ice
storage tank).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>Since
eQUEST’s results do not appear to be correct, I use an excel spreadsheet
from a Thermal Storage manufacturer to calculate the savings. Since there should
be a minimal energy consumption difference, I simply subtract the savings from
the electrical cost. This method works fine except for the fact that I cannot
seem to force eQUEST to subtract the savings from the electric consumption. If
anyone knows how to subtract cost (and label it as “Ice Storage Savings”)
using eQUEST please respond to this email!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>Any
help is appreciated.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'>Otto
Schwieterman<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><o:p> </o:p></font></p>
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