Dear forum,
Apologies in advance for a messy question…..
Below is a schematic of an air loop.
· Note that there is a pre-cooling coil upstream of the Mixing Box.
· Also note that all of the numbers (e.g., 1200, 1204, etc.) are “shorthand” for a node name.
I want the pre-cooling coil to operate solely as a dehumidification device to maintain a specific humidity ratio. Everything else should operate in a fairly typical fashion for heating and cooling control, except that there is no economizer.
I show below the SetPointManagers and related mixed air NodeList that I am using with no success for dehumidification. Can you offer a suggestions to make this work?
Thanks!
| SetpointManager:MixedAir |
Name | SPMgr_MixAir_AHU-1 |
Control variable: | Temperature |
reference set point node name | 1210 (Node name equivalent) |
fan inlet node name | 1208 |
fan outlet node name | 1210 |
Name of the set point Node or Node List | MANodeLIST_AHU-1 |
| |
| SetPointManager:Warmest |
Name | SPMgr_DischAir_AHU-1-warmest |
Control Variable | Temperature |
HVAC Air Loop Name | AirLoop_AHU-1 |
Minimum Setpoint Temperature | 12.8 |
Maximum Setpoint Temperature | 26.7 |
Strategy | MaximumTemperature |
Setpoint Node or NodeList Name | 1210 |
| |
| SetpointManager:SingleZone:Humidity:Maximum |
Name | SPMgr_ZoneRH_AHU-1 |
Control Variable | MT |
Schedule Name | MT |
Setpoint Node or NodeList Name | 1210 |
Control Zone Air Node Name | Node_MainStore |
| |
| SetPointManager:Scheduled |
Name | SPMgr_Sched_AHU-1 |
Control Variable | Temperature |
Schedule Name | SchCpct_Always70F |
Setpoint Node or NodeList Name | 1204.5 ß E+ complains if I don’t have a temperature setpoint for the pre-cooling coil |
| |
| SetPointManager:OutdoorAirPretreat |
Name | SPMgr_OAdehum_AHU-1 |
Control Variable | MaximumHumidityRatio |
Minimum Setpoint Temperature | 10 |
Maximum Setpoint Temperature | 30 |
Minimum Setpoint Humidity Ratio | 0.0008 |
Maximum Setpoint Humidity Ratio | 0.0091 |
Reference Setpoint Node Name | 1205 |
Mixed Air Stream Node Name | 1205 |
Outdoor Air Stream Node Name | 1204.5 |
Return Air Stream Node Name | 1200 |
Setpoint Node or NodeList Name | 1204.5 |
| NodeList |
Name | MANodeLIST_AHU-1 |
Node Name1 | 1205 |
| 1207 |
| 1208 |
| 1204.5 |
Making me think….
"He who is kind is free, even if he is a slave. He who is evil is a slave, even if he is king."
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