The DesignBuilder help has some ideas on how to customise the basic E+ economiser and HR functions. You may find it useful:
http://www.designbuilder.co.uk/helpv4.5/#Generic_AHU.htm
Search the page for "Heat recovery control tips"
Andy
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]
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. At the moment I set:
Controller:OutdoorAir,
Circuito ad Aria UTA Controllore Aria Esterna, !- Name
Circuito ad Aria UTA Relief Air Outlet, !- Relief Air Outlet Node Name
Circuito ad Aria UTA Ventilatore di Estrazione Air Outlet Node, !- Return Air Node Name
Circuito ad Aria UTA Mixed Air Outlet, !- Mixed Air Node Name
Circuito ad Aria UTA Outdoor Air Inlet, !- Actuator Node Name
autosize, !- Minimum Outdoor Air Flow Rate {m3/s}
autosize, &nbs p; !- Maximum Outdoor Air Flow Rate {m3/s}
FixedDryBulb, !- Economizer Control Type
MinimumFlowWithBypass, !- Economizer Control Action Type
23, !- Economizer Maximum Limit Dry-Bulb Temperature {C}
, !- Economizer Maximum Limit Enthalpy {J/kg}
, !- Economizer Maximum Limit Dewpoint Temperature {C}
, & nbsp;&nb sp; !- Electronic Enthalpy Limit Curve Name
16, !- Economizer Minimum Limit Dry-Bulb Temperature {C}
LockoutWithCompressor, !- Lockout Type
FixedMinimum, !- Minimum Limit Type
2, !- Minimum Outdoor Air Schedule Name
, !- Minimum Fraction of Outdoor Air Schedule Name
, & nbsp;&nb sp; !- Maximum Fraction of Outdoor Air Schedule Name
, !- Mechanical Ventilation Controller Name
, !- Time of Day Economizer Control Schedule Name
No, !- High Humidity Control
, !- Humidistat Control Zone Name
1, & nbsp;&nb sp; !- High Humidity Outdoor Air Flow Ratio
Yes, !- Control High Indoor Humidity Based on Outdoor Humidity Ratio
BypassWhenWithinEconomizerLimits; !- Heat Recovery Bypass Control Type
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.
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.
Could anyone help me or point me a different solution to reach my intent?
Thanks a lot
(this message correct a the previous one)
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Posted by: Andy Tindale <Andy.Tindale@xxxxxxxxxxxxxxxxxxx>
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