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<p>David,<br>
</p>
<p><br>
</p>
<p>Thank you for your feedback.I am grateful.<br>
</p>
<p><br>
</p>
<p>Regards<br>
</p>
<p>Idris<br>
</p>
<p><br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> David BRADLEY <d.bradley@tess-inc.com><br>
<b>Sent:</b> 04 May 2015 17:04<br>
<b>To:</b> Shofolahan, Idris Adewale; TRNSYS users mailing list at OneBuilding.org<br>
<b>Subject:</b> Re: [TRNSYS-users] Type 510 cooling tower -Fan control signal error</font>
<div> </div>
</div>
<div>Idris,<br>
There are numerous reasons why this might happen. As I mentioned in a previous mail if the current ambient wetbulb temperature is higher than your desired outlet temperature then the desired outlet temperature cannot be achieved. When I mentioned it before
it was in the context of the design condition not in the context of the current conditions but the same physics applies. If you are unable to determine the cause of the behavior then I would recommend that you send your project to your distributor for assistance.
<br>
regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/2/2015 7:30 AM, Shofolahan, Idris Adewale wrote:<br>
</div>
<blockquote type="cite">
<div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif">
<p>David,<br>
</p>
<p><br>
</p>
<p>Thank you. Yes,I am trying to achieve an outlet temperature set at 8th input and I did set the fan control signal (input 7) to -1 but, the outlet water temperature is still higher than the desired outlet temperature.For example,the desired outlet temperature was
set at 24C as the 8th input, but the outlet fluid temperature was 29C. What is the reason for not achieving the desired outlet fluid temperature?<br>
</p>
<p><br>
</p>
<p>Regards<br>
</p>
<p>Idris<br>
</p>
<p><br>
</p>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> David BRADLEY
<a class="moz-txt-link-rfc2396E" href="mailto:d.bradley@tess-inc.com"><d.bradley@tess-inc.com></a><br>
<b>Sent:</b> 01 May 2015 17:04<br>
<b>To:</b> Shofolahan, Idris Adewale; TRNSYS users mailing list at OneBuilding.org<br>
<b>Subject:</b> Re: [TRNSYS-users] Type 510 cooling tower -Fan control signal error</font>
<div> </div>
</div>
<div>Idris,<br>
The design outlet fluid temperature is the outlet fluid temperature that you would get if all the inlet conditions were at the design condition. The design outlet fluid temperature is not a "set point" temperature that the tower is trying to achieve. If you
are trying to achieve a certain outlet temperature then you have to set that temperature as the 8th input and you have to set the fan control signal (input 7) to -1 (as it says in the "more" buttons for the Type). If you are not trying to control the outlet
liquid temperature but just want it to be closer to the wetbulb temperature then you have to increase the air flow rate that the fans are providing.<br>
regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/30/2015 5:45 PM, Shofolahan, Idris Adewale wrote:<br>
</div>
<blockquote type="cite">
<div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif">
<p>David,<br>
</p>
<p><br>
</p>
<p>Thank you for your response.I have checked the parameters as suggested.The design outlet fluid temperature was not below the design wet bulb temperature. Although,when I reduce the design wet bulb temperature,I didn't get any error message.</p>
<p><br>
</p>
<p>However,the outlet water temperature is higher than the design outlet fluid temperature. How can I achieve a lower outlet water temperature,probably similar to the <span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">design
outlet </span><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">fluid temperature or lower?</span><br>
</p>
<p><br>
</p>
<div id="Signature">
<div name="divtagdefaultwrapper" style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:; margin:0">
<p>Regards,<br>
</p>
<p>Idris<br>
</p>
<p><br>
</p>
<p> </p>
<p> </p>
</div>
</div>
<div style="color:rgb(0,0,0)">
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<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> David BRADLEY
<a class="moz-txt-link-rfc2396E" href="mailto:d.bradley@tess-inc.com"><d.bradley@tess-inc.com></a><br>
<b>Sent:</b> 30 April 2015 15:35<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org; Shofolahan, Idris Adewale<br>
<b>Subject:</b> Re: [TRNSYS-users] Type 510 cooling tower -Fan control signal error</font>
<div> </div>
</div>
<div>Idris,<br>
The error message doesn't have to do with the fan control signal. The error is that the model cannot determine the energy transfer coefficients for the tower given the parameters that you have entered. For example, if you give a design outlet fluid temperature
that is below the design wet bulb temperature then it is physically impossible for a tower to deliver such an outlet water temperature and the model will generate the error that you received. The fan control signal appears involved because the energy transfer
coefficients are only calculated if the tower is actually on and running.<br>
regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/30/2015 12:20 AM, Shofolahan, Idris Adewale wrote:<br>
</div>
<blockquote type="cite">
<pre>Dear all,
I'm currently working on a project using a chiller and type 510 cooling tower. The project is given error when the fan control signal is set at 1 at the input tab. What do you think is the cause of this error? Schematics and error message of the project attached.Thank you.
Regards,
Idris
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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
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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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<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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