Hi everybody,
I'm trying to model a radiant system in which the return flowrate of the radiant is recirculated. I’m using type 11b to divide the return flowrate into 2 parts so that the temperature at the inlet of the radiant system is constant at 31 ° C. A part of the flowrate out of the type11b is recirculated and a part is heated in a tank and subsequently mixed in the type 11h with the recirculated flowrate. After the type11h I have a constant flowrate pump (type114) and then I have the radiant system to which I apply a negative delta_T. The flowrate out of the radiant is sent to type11b. Having applied a negative delta_T the temperature at the inlet of type 11b is lower than 31 ° C but trnsys gives me this error message: "The inlet temperature and the heat source temperature have simultaneously exceeded the set point temperature. Gamma has been set to 0 (Mode 4) or 1 (Mode 5) ". I tried to simulate the same system with the type 115 but I have the same problems. If I simulate an open loop system such as a domestic hot water system I haven't errors. I have errors in case i simulate a closed loop system where recirculated water is required.
Basically the system is the same as that of page 4-328 (component mathematical reference) figure 4.5.2-4 with the difference that the to-load and the make-up are united (same flowrate but different temperature), but the to-load temperature is higher than the make -up beacause of I apply a delta_t through a calculator (equa) beetwen to-load and make-un. I hope you can help me.
Best regards