[TRNSYS-users] questions about type 56 building model and chiller

[Zhuo Li]

Dear Trnsys users,



I am using type 56 to model an air conditioning system for a three-story building. In my program, each floor has an air handling unit and the external air relative humidity ratio, mass flow rate, and temperature are obtained as ventilation inputs to building model from Type 607, which is connected to cooling coils (type 508).  The temperatures of thermal zones of 1st floor are within acceptable range, whereas temperatures of thermal zones of 2nd and 3rd floor are going infinitely high. How can I solve this problem?



In addition, I encountered problems with chiller and ducts. The warning messages are written below:

1) The file\Trnsys 17\Tess Models\SampleCatalogData\AirCooledChiller\Samp_C.dat was called with a first independent variable value below the range supplied in the data file. Data is interpolated within the data file range but is not extrapolated beyond  the range. Performance of the equipment modeled by this unit may be incorrect.
2) The referenced UNIT\ (Type 607)\ has called the PSYCHROMETRICS routine with a humidity ratio above the saturation humidity ratio for the given dry bulb temperature. The air was assumed saturated at the given dry bulb temperature and the humidity ratio set for this condition.
For the chiller, parameter of rated capacity was changed and other parameters remained as default values.
Thanks in advance for your help.
Best regards,

Zhuo Li


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