RE: [EnergyPlus_Support] Problem in using EMS actuator to control Controller:OutdoorAir

On 13 Nov 2015 17:03, "Andy Tindale andy.tindale@xxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

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The DesignBuilder help has some ideas on how to customise the basic E+ economiser and HR functions. You may find it useful:
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http://www.designbuilder.co.uk/helpv4.5/#Generic_AHU.htm
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Search the page for "Heat recovery control tips"
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Andy
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, November 13, 2015 11:41 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Problem in using EMS actuator to control Controller:OutdoorAir [2 Attachments]
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Dear all,

I'm trying to model a simple CAV with a heatexchanger:airtoair and without heating coils to bring fresh air to a zone. I would also to implement freecoling for the system using the object Controller:OutdoorAir.

In this object I have to set the economizer minimum and maximum limit dbt.

The heating SPtemperature is 20 and the cooling SPtemperature is 23 extended for the whole year.Â At the moment I set:

Controller:OutdoorAir,
Â Â Â Circuito ad Aria UTAÂ Controllore Aria Esterna,Â !- Name
Â Â Â Circuito ad Aria UTA Relief Air Outlet,Â !- Relief Air Outlet Node Name
Â Â Â Circuito ad Aria UTA Ventilatore di Estrazione Air Outlet Node,Â !- Return Air Node Name
Â Â Â Circuito ad Aria UTA Mixed Air Outlet,Â !- Mixed Air Node Name
Â Â Â Circuito ad Aria UTA Outdoor Air Inlet,Â !- Actuator Node Name
Â Â Â autosize,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Minimum Outdoor Air Flow Rate {m3/s}
Â Â Â autosize,Â Â Â Â Â Â &nbs p;Â Â Â Â Â Â Â Â !- Maximum Outdoor Air Flow Rate {m3/s}
Â Â Â FixedDryBulb,Â Â Â Â Â Â Â Â Â Â Â !- Economizer Control Type
Â Â Â MinimumFlowWithBypass,Â Â !- Economizer Control Action Type
Â Â Â 23,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Economizer Maximum Limit Dry-Bulb Temperature {C}
Â Â Â ,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Economizer Maximum Limit Enthalpy {J/kg}
Â Â Â ,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Economizer Maximum Limit Dewpoint Temperature {C}
Â Â Â ,Â Â Â Â Â Â & nbsp;&nb sp;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Electronic Enthalpy Limit Curve Name
Â Â Â 16,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Economizer Minimum Limit Dry-Bulb Temperature {C}
Â Â Â LockoutWithCompressor,Â Â !- Lockout Type
Â Â Â FixedMinimum,Â Â Â Â Â Â Â Â Â Â Â !- Minimum Limit Type
Â Â Â 2,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Minimum Outdoor Air Schedule Name
Â Â Â ,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Minimum Fraction of Outdoor Air Schedule Name
Â Â Â ,Â Â Â Â & nbsp;&nb sp;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Maximum Fraction of Outdoor Air Schedule Name
Â Â Â ,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Mechanical Ventilation Controller Name
Â Â Â ,Â Â Â Â Â Â Â !- Time of Day Economizer Control Schedule Name
Â Â Â No,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- High Humidity Control
Â Â Â ,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Humidistat Control Zone Name
Â Â Â 1,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â & nbsp;&nb sp; !- High Humidity Outdoor Air Flow Ratio
Â Â Â Yes,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Control High Indoor Humidity Based on Outdoor Humidity Ratio
Â Â Â BypassWhenWithinEconomizerLimits;Â !- Heat Recovery Bypass Control Type
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But in this case I obtain that in winter the heatexchanger is bypassed when external temperature are in the raneg 16-20C and it's not correct.
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I was wondering about how to assign different !- Economizer Minimum Limit Dry-Bulb Temperature {C} according to the season, using in this case 20C instead of 16C... and I tryed to set up a EMS actuator for the variable !- Economizer Minimum Limit Dry-Bulb Temperature {C} but things are not working. I have problems to set the actuator for that variable.
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Could anyone help me or point me a different solution to reach my intent?
Thanks a lot
(this message correct a the previous one)