Re: [EnergyPlus_Support] Residential Central Fan Integrated Ventilation

That may be quite tricky for a "novice", but it's doable. set the fan (which I assume is a continous set flowrate type) schedule to turn on and off as you described. then use the availibilitymanager nightventilation object to override your fan schedule if it is off when there are loads to combat in the zones. For the AHU you're probably looking at using one of the "unitary" objects (they come with furnace heating and dx cooling coil). forget about the ducting. thermodynamically they could all be sepetately ducted to outdoors. Your biggest friend here is the input output reference guide and the countless examples. both are easily searchable.

let us know how you get on.

Jean

Sent from my iPhone

On 04.12.2012, at 00:54, "buildingsimulator" <mikemoore2@xxxxxxxxx> wrote:

I'm trying to account for the energy use (fan and heating and cooling penalty/benefit) associated with the specification of a central fan integrated (CFI) ventilation system for a single family home with a single zone heating and cooling system. This system uses an outdoor air duct with a mechanical damper connected to the return trunk of a centrally ducted system. Control sequence for the mechanical OA damper is:
10 minutes on
20 minutes off

When the damper is "ON" (i.e., open), the central fan is turned ON. When the damper is "OFF", the central fan responds to calls for heating and cooling. Heating and cooling cycles can also occur when the damper is "ON". Heat is provided by a centrally ducted natural gas fired forced air furnace. Cooling is provided by a traditional, centrally ducted AC unit with the coil just downstream of the furnace heat exchanger.

I'm an EnergyPlus novice, and am wondering how I might model this. It seems like the Unit Ventilator might be a good idea, but I'm not sure that I can pair this with a natural gas-fired furnace and DX cooling coil. Also, how would I write the schedule for the OA damper and ensure that I don't double-count the ventilation fan energy used when the OA damper is "ON" and there is a simultaneous call for heating or cooling?

Thanks,

Mike

__._,_.___

Primary EnergyPlus support is found at: http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx The primary EnergyPlus web site is found at: http://www.energyplus.gov The group web site is: http://groups.yahoo.com/group/EnergyPlus_Support/ Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files. EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___