<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Lucio,<div><br></div><div>The current models in the TESS Libraries do not include the option for two phase flow in the solar collector models. If this is of great interest, we could prepare a quote to perform the necessary changes to allow for steam.</div><div><br></div><div>Let me know!</div><div><br></div><div>Jeff - TESS<br><br><div id="AppleMailSignature">Sent from my iPhone</div><div><br>On Aug 13, 2019, at 8:00 AM, Lucia Royo Pascual via TRNSYS-users <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear Jeff,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">First of all, thank you in advance for your response.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Regarding your proposal, it could be a nice solution to overcome the simulation of steam by means of a steam generator. However, as a first step I would be interested (if it is possible)
to simulate the boiling process within the Fresnel collector as a direct steam generator (DSG). Have you developed any library that can simulate that effect?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Thank you in advance,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Kind regards,<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#E05206">PhD. Lucía Royo Pascual</span></b><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>De:</b> Jeff Thornton <<a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a>> <br>
<b>Enviado el:</b> lunes, 12 de agosto de 2019 20:03<br>
<b>Para:</b> TRNSYS users mailing list at <a href="http://OneBuilding.org">OneBuilding.org</a> <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>><br>
<b>Asunto:</b> Re: [TRNSYS-users] TRNSYS Simulation Fresnel & steam<o:p></o:p></p>
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<p>Lucia,<o:p></o:p></p>
<p>The collector models that you reference are not intended to work with two-phase flow like steam and were written assuming constant liquid inlet and outlet fluid properties. Have you considered keeping the collector loop isolated from the steam loop and
utilizing a steam generator to create the steam? Many of the large solar power plants utilize this concept.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Jeff <o:p></o:p></p>
<p> <o:p></o:p></p>
<div>
<pre>---<br>Jeff Thornton<o:p></o:p></pre>
<pre>President - TESS LLC<o:p></o:p></pre>
<pre>3 N. Pinckney Street, Suite 202, Madison WI USA 53703<o:p></o:p></pre>
<pre>Office: (608) 274-2577 Fax: (608) 278-1475<o:p></o:p></pre>
<pre><a href="http://www.tess-inc.com">www.tess-inc.com</a><o:p></o:p></pre>
<pre>E-Mail: <a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a><o:p></o:p></pre>
</div>
<p>On 08/12/2019 1:16 am, Lucia Royo Pascual via TRNSYS-users wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello TRNSYS users,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am writing to you this e-mail in order to ask you about the simulation of steam cycle using a solar field (Fresnel or flat plate collector).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The idea is to simulate the water-steam stream using the solar field. I have seen that there is the possibility to use a flash tank to separate water and steam in the TESS library.
In this tank, it is possible to define the pressure. However, I have seen that in the solar collector field it is not possible to fix the outlet pressure, only the Cp can be modified.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Could you explain me briefly how can I change the outlet pressure in the collector type? It is possible to define steam at the outlet using a control? Is there any example that
I can use to start my simulation?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have TESS libraries, but I have seen that there is no example of this feature…<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you in advance,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Kind regards,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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