RE: [EnergyPlus_Support] OA

Dr. Li,

Thanks for your reply.

I follow your method of specifying OA controls. But it arises one more question to me, how would a multi-zone system's OA controller distribute OA supply to each zone as per its individual needs? I am not able to find an answer for that.

Vinay

On Fri, Jun 3, 2011 at 8:27 PM, YuanLu Li <yli006@xxxxxxxxxxx> wrote:

The simple answer is yes, and you need not use EMS to control the OA inlet node actuator.

The following is from page 1670 of the I/O Ref Manual.

Controller:OutdoorAir,

OA Controller 1, !- Name

Relief Air Outlet Node, !- Relief Air Outlet Node Name

Outdoor Air Mixer Inlet Node, !- Return Air Node Name

Mixed Air Node, !- Mixed Air Node Name

Outdoor Air Inlet Node, !- Actuator Node Name

0.25, !- Minimum Outdoor Air Flow Rate {m3/s}

1.6, !- Maximum Outdoor Air Flow Rate {m3/s}

ElectronicEnthalpy, !- Economizer Control Type

ModulateFlow, !- Economizer Control Action Type

23., !- Economizer Maximum Limit Dry-Bulb Temperature {C}

, !- Economizer Maximum Limit Enthalpy {J/kg}

13.5, !- Economizer Maximum Limit Dewpoint Temperature {C}

ElectronicEnthalpyCurveA,!- Electronic Enthalpy Limit Curve Name

14., !- Economizer Minimum Limit Dry-Bulb Temperature {C}

NoLockout, !- Lockout Type

FixedMinimum, !- Minimum Limit Type

OAFractionSched, !- Minimum Outdoor Air Schedule Name

, !- Minimum Fraction of Outdoor Air Schedule Name

, !- Maximum Fraction of Outdoor Air Schedule Name

, !- Mechanical Ventilation Controller Name

TimeOfDayEconomizerSch, !- Time of Day Economizer Control Schedule Name

Yes, !- High Humidity Control

EAST ZONE, !- Humidistat Control Zone Name

0.9, !- High Humidity Outdoor Air Flow Ratio
Yes; !- Control High Indoor Humidity Based on Outdoor Humidity Ratio

Curve:Cubic,

ElectronicEnthalpyCurveA,!- Name

0.01342704, !- Coefficient1 Constant

-0.00047892, !- Coefficient2 x

0.000053352, !- Coefficient3 x**2

-0.0000018103, !- Coefficient4 x**3

16.6, !- Minimum Value of x

29.13; !- Maximum Value of x
=================
You need not use all the fields. There may be a simpler one without the economizer section. It has the option to use the sum of the minimum, and people, equipment, etc of the zone.
Controller:MechanicalVentilation
=======================
I do not quite follow your question with the Zone sizing - using the DesignSpecification:OutsideAir object. Zone sizing controls the equipment capacity. It will include the load demands, but do not vary the flow rate according to a schedule.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: vinay.devanathan@xxxxxxxxx
Date: Fri, 3 Jun 2011 18:28:21 -0400
Subject: [EnergyPlus_Support] OA - Zone Level

Hello,

I would like to know if it is possible to specify Outdoor Air demand at Zone Level with the use of a Schedule. For example, a schedule or a pattern describing the demand for different OA Supply CFM at different times in the Zone Level? The only way to specify OA cfm to zones is using the Sizing:Zone object (excluding VAV system - which can use the DesignSpecification:OutsideAir object). Am I correct? Is there any other way to override this and introduce OA supply to the zones? Can this be done using EMS?

Thank you.

Vinay

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RE: [EnergyPlus_Support] OA - Zone Level