modelIntegratedOperation
Validates cooling tower fan speed control sequence for integrated operation of chillers and WSE
Information
This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Towers.FanSpeed.EnabledWSE.Subsequences.IntegratedOperation.
The waterside economizer keeps operating and the chiller 1 is proven on since 200 seconds. Thus, the plant switches from the economizer-only operation to the integrated operation.
- When the operation switches to the integrated operation, in the first 10 minutes, which is the period from 200 seconds to 800 seconds, the fan speed is held at 100%.
- At the moment when the 10 minutes period ends, it enables the PID controller and its output is reset to 100%. Thus, the fan speed begins at 100% speed.
- When the sum of the running chiller load becomes greater than the sum of the running chillers' minimum load, the control increases the fan speed. This shows the direct-acting of the PID controller.
Note that this sequence does not control the fan speed when the economizer is running
only. Thus, the fan speed setpoint ySpeSet before 200 seconds is not
valid.
For the control when the economizer runs only, please see the example in
Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Towers.FanSpeed.EnabledWSE.Subsequences.Validation.WSEOperation.
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Towers.FanSpeed.EnabledWSE.Subsequences.IntegratedOperation | intOpe | Tower fan speed control when chiller and waterside economizer are running | |
| Buildings.Controls.OBC.CDL.Logical.Sources.Constant | wseSta | WSE status | |
| Buildings.Controls.OBC.CDL.Logical.Sources.Pulse | booPul | Boolean pulse | |
| Buildings.Controls.OBC.CDL.Logical.Not | chiSta | First chiller status | |
| Buildings.Controls.OBC.CDL.Logical.Sources.Constant | chiSta1 | Second chiller status | |
| Buildings.Controls.OBC.CDL.Reals.Sources.Constant | con | Zero constant | |
| Buildings.Controls.OBC.CDL.Reals.Switch | swi | Logical switch | |
| Buildings.Controls.OBC.CDL.Reals.Sources.Sin | sin | Chiller load |
Revisions
-
August 12, 2019, by Jianjun Hu:
First implementation.