Re: [EnergyPlus_Support] Setpoint Managers are driving me crazy!

[Richard Raustad <RRaustad@xxxxxxxxxxxx>]

Does this help?

Controller:WaterCoil,
  \min-fields 9
  A1 , \field Name
       \type alpha
       \required-field
       \reference AirLoopControllers
  A2 , \field Control Variable
       \type choice
       \key Temperature
       \key HumidityRatio
       \key TemperatureAndHumidityRatio
       \note keys HumidityRatio or TemperatureAndHumidityRatio
       \note requires a ZoneControl:Humidistat object along
       \note with SetpointManager:SingleZone:Humidity:Maximum,
       \note SetpointManager:MultiZone:MaximumHumidity:Average, or
       \note SetpointManager:Multizone:Humidity:Maximum object


On 5/21/2012 11:55 AM, Jim Dirkes wrote:

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." 

 

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
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