blockSpeed_primary_remoteDp
Pump speed control for primary-only plants where the remote DP sensor(s) is hardwired to the plant controller
Information
Block that outputs chilled water pump speed setpoint for primary-only plants where
the remote pressure differential sensor is hardwired to the plant controller,
according to ASHRAE Guideline 36-2021,
section 5.20.6 Primary chilled water pumps, part 5.20.6.7 and 5.20.6.8.
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When any chilled water pump is proven on,
uChiWatPum = true,
the pump speed will be controlled by a reverse-acting PID loop, maintaining the
differential pressure signal at a setpoint dpChiWatSet. All pumps
receive the same speed signal. PID loop output shall be mapped from the minimum
pump speed (minPumSpe) at 0% to the maximum pump speed
(maxPumSpe) at 100%.
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Where multiple differential pressure sensors exist, a PID loop shall run for
each sensor. Chilled water pumps shall be controlled to the maximum signal output
of all DP sensor loops.
Parameters
| Type | Name | Default | Description |
|---|
| Integer | nSen | 2 | Total number of remote differential pressure sensors |
| Integer | nPum | 2 | Total number of chilled water pumps |
| Real | minPumSpe | 0.1 | Minimum pump speed |
| Real | maxPumSpe | 1 | Maximum pump speed |
| Speed controller |
| Buildings.Controls.OBC.CDL.Types.SimpleController | controllerType | Buildings.Controls.OBC.CDL.Types.SimpleController.PI | Type of controller |
| Real | k | 1 | Gain of controller |
| Real | Ti | 0.5 | Time constant of integrator block |
| Real | Td | 0.1 | Time constant of derivative block |
Revisions
-
August 1, 2019, by Jianjun Hu:
First implementation.
