<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1448959671397_20718" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;">Dear trnsys users,<div id="yui_3_16_0_1_1448959671397_20717" class="y_msg_container"><div id="yiv4993266836"><div id="yui_3_16_0_1_1448959671397_20716"><div id="yui_3_16_0_1_1448959671397_20715" style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv4993266836yui_3_16_0_1_1448620003444_3216">I encounterd the following message when simulate a model with chilled ceiling.<br></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3218"><br></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3214" dir="ltr">*** Fatal Error at time : 1.000000<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3179"> Generated by Unit : 56<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3181"> Generated by Type : 56<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3183"> Message : multizone building - Resistance from radiant panel Rr_Rx negativ this might be caused by a too high Resistance Rw (e.g laminar instead of turbulent flow) or a too low estimated Resistance R_WRX<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3185"> <br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3187"> <br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3189">*** Fatal Error at time : 1.000000<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3191"> Generated by Unit : 56<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3193"> Generated by Type : 56<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3195"> TRNSYS Message 191 : Subroutine MATRIX_INVERT was called from subroutine INVPAR with a singular matrix.<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3197"> Reported information : Subroutine INVERT was called from subroutine INVPAR with a singular matrix!<br class="yiv4993266836" id="yiv4993266836yui_3_16_0_1_1448620003444_3199"></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3263" dir="ltr"><br></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3262" dir="ltr">So i did some tests, i changed the Uwrx value, finally, i found that the model could turn well only when the Uwrx is lower than 110 kJ/h/m²K. But i don't understand if this value can be used. Because the value proposed in the table 5.4.5-1 for the barcol-air product is about 38 W/m², otherwise 136.8 kJ/h/m². This value should be divided by the dTsurf_norm ? The two different units for Uwrx in the Eq5.4.5-1 [kJ/h m² K] and the table 5.4.5-1 [W/m2] make me confused. If the value of Uwrx in the table 5.4.5-1 shoud be divided by the dTsurf_norm corresponded, it make sens for my tested value. If not, i really don't understand.</div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3637" dir="ltr"><br></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3648" dir="ltr">Aleck <br></div><div id="yiv4993266836yui_3_16_0_1_1448620003444_3638" dir="ltr"><br></div></div></div></div><br><br></div> </div><div class="qtdSeparateBR"><br><br></div><div style="display: block;" id="yui_3_16_0_1_1448959671397_20720" class="yahoo_quoted"><div id="yui_3_16_0_1_1448959671397_20719" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> </div> </div></div></body></html>