Hello,

I am trying to change a single speed cooling tower serving WSHPs to a variable speed cooling tower, but every time I make the change in OS, it stops working and I have to close it. No error file is generated, so it is not possible to understand the reason for the issue. I am keeping the design inputs same for the single speed and variable speed with the only change being the fan control. Even if I specify a fluid cooler instead of a cooling tower, the issue persists. Even if I change the type of setpoint manager, or delete one / all setpoint managers, the issue persists.

Here is the picture of the configuration:

The heat exchanger exchanges heat with boilers. That's how the system is designed.

Looks like a similar problem was reported previously. https://unmethours.com/question/580/o.... However, answers to that thread don't help me. OS does not seem to model variable speed as readily as single speed.

Please share your thoughts on this.

Pranav

PS:Since I was not able to model the variable speed control in OS, I tried modeling it in E+. E+ simulated the IDF file, but (prima facie) the electrical energy increased instead decreasing.....so that's one more issue. I will write about this if I don't get any helpful tips on the OS issue above!!

Here is the picture of the issue C:\fakepath\OS-April3-1.png