I encounterd the following message when simulate a model with chilled ceiling.
*** Fatal Error at time : 1.000000
Generated by Unit : 56
Generated by Type : 56
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
*** Fatal Error at time : 1.000000
Generated by Unit : 56
Generated by Type : 56
TRNSYS Message 191 : Subroutine MATRIX_INVERT was called from subroutine INVPAR with a singular matrix.
Reported information : Subroutine INVERT was called from subroutine INVPAR with a singular matrix!
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.
Aleck