[EnergyPlus_Support] EMS overwrite and CAV system [1 Attachment]

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Subject: [EnergyPlus_Support] EMS overwrite and CAV system [1 Attachment]

From: Artem Zhukov <artem.zhukov@xxxxxxxxxxx>

Date: Wed, 29 Jan 2014 13:00:50 +0100

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Dear All,

I try to model DOAS system and fancoil (FCU) supplement system.

The problem occur when I start use EMS to switch off the FCU’s fans when there aren’t water flow through heating and cooling coil. I have created separate availability schedules for FCU fans:

Fan:OnOff,

Offices_1st_flo Supply Fan, !- Name

Offices_1s_flo_FCU_fan_availability, !- Availability Schedule Name

And overwrite its value from 1 to 0 if water flows through coils is 0.

But I notice that the fan from DOAS system start operate as variable and do not supply max airflow 24/7. If I remove the EMS code the DOAS fan works ok (24/7 at max performance).

I can’t observed the connection. Moreover if in EMS code I change the following:

EnergyManagementSystem:Program,

MyComputedAvSchdProg, !- Name

IF (m_ch_w_O1stFLO==0) && (m_h_w_O1stFLO==0), !- Program Line 1

Set myOffices_1s_flo_FCU_fan_availability_Override = 0 (change to 1) , !- Program Line 2

ELSE, !- A4

Set myOffices_1s_flo_FCU_fan_availability_Override = 1, !- A5

ENDIF, !- A6

The DOAS fan start operate as should.

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