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Wu,<br>
Type666 models a chiller that can modulate its capacity using
internal controls to maintain a steady chilled water outlet
temperature. I would think that using the chiller on/off signal
would result in the outlet chilled water temperature either being
equal to the inlet temperature or being equal to the user-defined
chilled water setpoint temperature so long as the chiller has enough
capacity to meet the setpoint. Usually when I have seen staged
chillers in a project each chiller is able to modulate its capacity
internally and multiple chillers are staged sequentially as they
reach their respective capacities. I have not run across a chiller
that did not have the ability to run at part load so as to maintain
a setpoint. If you are looking for a model of a chiller stack that
contains multiple variable capacity chillers then I have written
such a component. In order to use it you would need to define
equations or use a controller component that would decide how many
of the chillers should be on at any given time. If you are
interested in purchasing the component, please contact me directly
and I can estimate the cost.<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/28/2015 00:12, 吴伟伟v v wrote:<br>
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<blockquote cite="mid:BLU180-W50436CBE8A769BF56B904D2210@phx.gbl"
type="cite">
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<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
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align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Dear users,
<!--?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /--><o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><o:p> </o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Hi all!<o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">I’m using TRNSYS to model a typical HVAC
system,i.e.,chiller( type666) and fan coil(type 508a)
combined a building model(type 56). I set a room
thermostat(type645) for room temperature control, but I
found that the chiller has oscillations which result in
chilled water temperature fluctuated strongly <span
style="mso-spacerun: yes"> </span>several times even in an
hour</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">。<span
lang="EN-US">My question is as following:<o:p></o:p></span></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><o:p> </o:p></span></p>
<p style="TEXT-ALIGN: left; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm
0pt 18pt; mso-pagination: widow-orphan; tab-stops: 45.8pt
91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt
458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;
mso-char-indent-count: 0; mso-list: l0 level1 lfo1"
class="MsoListParagraph" align="left"><span
style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><span style="mso-list: Ignore">1.<span
style="FONT: 7pt 'Times New Roman'"> </span></span></span><span
style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Is there any idea to control Type666 to output
its cooling capacity as 0.25,0.5,0.75, 1,like stages
control? <o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; TEXT-INDENT: -18pt; MARGIN: 0cm 0cm
0pt 18pt; mso-pagination: widow-orphan; tab-stops: 45.8pt
91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt
458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;
mso-char-indent-count: 0; mso-list: l0 level1 lfo1"
class="MsoListParagraph" align="left"><span
style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><span style="mso-list: Ignore">2.<span
style="FONT: 7pt 'Times New Roman'"> </span></span></span><span
style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Should I set more chiller(equally sized) in the
model to realize the number of chillers control instead of
one chiller?</span><span style="FONT-FAMILY: 宋体; FONT-SIZE:
12pt; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><o:p> </o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><o:p> </o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">I did not found the relevant information in the
forum. Can someone please help me with this issue?<o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US"><o:p> </o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">With best wishes<o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Yours sincerely<o:p></o:p></span></p>
<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination:
widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt
274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt
595.4pt 641.2pt 687.0pt 732.8pt" class="MsoNormal"
align="left"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt;
mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"
lang="EN-US">Wu weiwei<o:p></o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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