blockTuning
Defines a tuning parameter for the temperature prediction downstream of WSE
Information
Waterside economizer outlet temperature prediction tuning parameter subsequence per ASHRAE Guideline 36-2021, section 5.20.3.3.
The subsequence calculates the tuning parameter y as follows:
-
Decrease
yinstepwhen the WSE is disabled if the WSE remained enabled for more thanwseOnTimDecperiod. -
Increase
yinstepwhen the WSE is disabled if the WSE remained enabled for less thanwseOnTimIncperiod and the cooling tower fan speed signaluTowFanSpeMaxdid not decrease below 100% speed while the WSE was enabled.
y initializes at 0 upon first plant start up,
it holds its value when the plant is disabled, and tuning resumes from that value when the
plant is re-enabled. It is limited between -0.2 and 0.5.
To avoid large integer values above larInt, the counters
get reset to 0 each time any of them reaches that value.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | step | 0.02 | Incremental step used to reduce or increase the water-side economizer tuning parameter |
| Real | wseOnTimDec | 3600 | Economizer enable time needed to allow decrease of the tuning parameter |
| Real | wseOnTimInc | 1800 | Economizer enable time needed to allow increase of the tuning parameter |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | uWseSta | WSE enable disable status | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | uTowFanSpeMax | Maximum cooling tower fan speed signal | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | y | Tuning parameter for the waterside economizer outlet temperature prediction |
Revisions
-
September 12, 2019, by Milica Grahovac:
Revised for performance. -
October 13, 2018, by Milica Grahovac:
First implementation.