Hi,
I have a
model with simple plant settings: Boiler/Chiller/Cooling Tower. My temperature
Setpoint is as listed below:
Boiler
Loop
Hot
water supply: 90°C
Hot
water return: 60°C
Chilled
Water Loop
Chilled
water supply: 6°C
Chilled
water return: 12°C
The node
connections are all correct and air paths passed integrity testing. The bypass
branch should works as well. However, the plant loop temperature goes out of
control for some period (Like: Hot water return temperature is too low, or
Chilled water return temperature is too high:
Plant loop falling below lower
temperature limit, PlantLoop="HEAT_PLANTLOOP"
************* **
~~~ ** This error occurred 3289 total times;
************* **
~~~ ** during Warmup 6 times;
************* **
~~~ ** during Sizing 0 times.
************* **
~~~ ** Min=15.010066
*************
Plant loop exceeding upper temperature
limit, PlantLoop="CHILLED_PLANTLOOP"
************* **
~~~ ** This error occurred 31592 total times;
************* **
~~~ ** during Warmup 1177 times;
************* **
~~~ ** during Sizing 0 times.
************* ** ~~~
** Max=31.890885
Could
anyone give me some clue about how to solve this problem, or which part might
goes wrong. I attach for you the simple IDF file. The weather data is for Frankfurt, Germany. Thanks so much for the help.
Thanks,
Eshagh