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<p>TRNSYS only calls equations/constants if the constituent values change. So if A = B + C, A is only re-evaluated if B or C change. That's been true from version 16 on.</p>
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<p>Jeff</p>
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<pre>---<br />Jeff Thornton
President - TESS LLC
3 N. Pinckney Street, Suite 202, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
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<p>On 10/24/2018 12:43 pm, Eric Peterson via TRNSYS-users wrote:</p>
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<p class="MsoNormal"><span style="color: #1f497d; mso-fareast-language: EN-US;">Hi David and/or Jeff,<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="color: #1f497d; mso-fareast-language: EN-US;">I am now putting some constants followed by other constants defined by equations in the head of a *.dck file, but find it runs painfully slow.<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="color: #1f497d; mso-fareast-language: EN-US;">Is there a way to ensure these are assessed once at the beginning of a simulation and are not assessed again?<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="color: windowtext;">Eric Peterson, PhD, PE, RPEQ, M-ASHRAE TC4.2 Climatic Data<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="color: windowtext;">Research Fellow in Geothermal Systems Modelling<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="color: windowtext;"><a href="http://www.geotech-project.eu/?portfolio=university-of-leeds">http://www.geotech-project.eu/?portfolio=university-of-leeds</a><!-- o ignored --></span></p>
<p class="MsoNormal"><span style="color: windowtext;">School of Civil Engineering, University of Leeds<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="color: windowtext;">Leeds, West Yorkshire LS2 9JT United Kingdom<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="color: windowtext;">Telephone +44 (-0) 11334 31957<!-- o ignored --></span></p>
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