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

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."