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





Temp is OK.  Humidity ratio is not.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Don Shirey
Sent: Monday, May 21, 2012 12:46 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Setpoint Managers are driving me crazy!

 

If you haven't already done so, suggest checking the temperature and high humidity setpoints at node 1204.5 to make sure they are getting written correctly to the cooling coil outlet node.

 

 

 

From: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Monday, May 21, 2012 12:31 PM
Subject: RE: [EnergyPlus_Support] Setpoint Managers are driving me crazy!

 

No.

I have a reasonable grasp of the basics (at least I think that’s true).  I do not have a good grasp of how SetPointManagers interact and particularly have little � no experience using a pre-coolingg coil and making it “play nicely” with the other coils.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Richard Raustad
Sent: Monday, May 21, 2012 12:11 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Setpoint Managers are driving me crazy!

 

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

 

 

 

 

 

 

Description: BPT BizCard JVDII Updated

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