<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi community, hope everyone is well.<div class=""><br class=""></div><div class="">I’m trying to model steam generation from solar parabolic trough, so to achieve this I have connected a type 536 outlet to the inlets of the counterflow HRSG type 637a.</div><div class=""><br class=""></div><div class="">The T536, is set to vary the flowrate to try and reach specified outlet temperature, so the flowrate is set by this component and in turn the input flowrate isn’t used. Right?</div><div class=""><br class=""></div><div class="">The T637a calculates the maximum steam flowrate available from the inputs and restrains, so this component sets the steam flowrate, ans so the input of steam flowrate isn’t used. Right?</div><div class=""><br class=""></div><div class="">I have the resumed the main connections to:</div><div class=""><br class=""></div><div class="">T536: Outlet flowrate —> T647a: Input hot side flowrate</div><div class="">T536: Out temp —> T647a: In hot temp</div><div class="">T637a: Out hot flow —> T536: in flow</div><div class="">T637a: Out hot temp —> T536: In temp</div><div class="">T637a: Out steam flow —> T637a: In steam flow (continuity?) </div><div class=""><br class=""></div><div class="">This will produce a 441 message "<i style="white-space: pre-wrap; background-color: rgb(255, 255, 255);" class="">The inputs to the listed units have not converged </i><i style="white-space: pre-wrap; background-color: rgb(255, 255, 255);" class="">at this timestep. The values at the last iteration will be used and </i><i style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class="">the simulation will proceed…</span></i><span style="white-space: pre-wrap;" class=""><i class="">” units are identified to the collector (T536) and HRSG (T637a).</i></span></div><div class=""><i style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class=""><br class=""></span></i></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class="">If I delete the 637a or the 536, the error 441 disappears, so this points that there is a problem with the connections or information exchanged between them.</span></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class=""><br class=""></span></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class="">Where should I start checking?</span></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class=""><br class=""></span></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class="">Best,</span></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="white-space: pre-wrap;" class="">José María Roca</span></span></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>