[TRNSYS-users] Type33 routine causing errors

[Marie-Claude Hamelin]

Hi all,
I am getting errors while using TRNSYS16 with GenOpt. I run four 
simulations at a time, they all load and even start returning some 
results, and then after a few seconds they stop because of a fatal 
error. "The subroutine SAT of the utility routine PSYCHROMETRICS, which 
calculates the thermodynamic properties of moist air, has been called 
with a temperature below absolute zero (-273 C).  Please check the TYPE 
routine which calls the psychrometrics routine for possible sources of 
errors." This error is generated by Type760 (heat-recovery ventilator).
I also get a lot of notices generated by Type56 "The utility routine 
PSYCHROMETRICS, which calculates the thermodynamic properties of moist 
air, has been called with conditions that yield a saturation pressure 
greater than the ambient pressure."

I have compared my .dck and .bui files with previous versions that did 
work properly, without finding any difference that could explain the 
errors. One strange output that I get from my simulation is that, while 
Bldg-HourTemp.out shows that temperatures in all 3 zones of the building 
are fine, Type56's output for air temperature on the second floor is 
always zero (until it crashes). The heating loads are also very close to 
zero. First simulation run always crashes at time 54.5 hours, simulation 
run 2 at 30.5 hours, simulation 3 at 31 and simulation 4 at 6 hours.

I have checked outputs from Type33 and Type760, and they all seem to be 
normal until simulation crashes.

Does anybody have an idea of what could cause that?
Thank you,

Marie-Claude Hamelin