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RE: [EnergyPlus_Support] Re: Simple Night + Day Ventilation
What I don't understand here is how you are gauging your expectations for what is suppossed to happen with both Ventilation objects. You should probably use 10-minute timesteps when using this trick because of some complicated details related to the timing of when Mixing energy is accounted for in the simulation. You could explore your concerns by testing just the single Ventilation object on dummy Zone B and comparing the results to the same single Ventilation object acting on Zone A.
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Rory Walsh
Sent: Thursday, February 02, 2006 1:36 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Simple Night + Day Ventilation
Hi Brent
Thanks for the advice regarding , "how to get a second ventilation
object to operate on a zone".
I am not sure if this is going to work for me though.
I have created two zones, Zone A (the real zone) and Zone B ( the
dummy zone) and linked these together using two mixing objects.
By applying the second "Ventilation Object" indirectly to Zone A
using Zone B, the "Ventilation Object" is losing access to the
internal temperatures in Zone A, which it needs to control night
ventilation properly.
I know that by using two Mixing Objects and a high volume flow rate
it is possible to force Zone B to be the same temperature as Zone A,
but a consequence of this is that the air in Zone B heats up and the
benefits of night ventilation available to Zone A are lost to some degree.
Essentially my model is not getting as cold at night using this
system as it would using a standard ventilation object.
Sorry if I have not explained my concerns very clearly, or if I have
misunderstood your suggestions.
Kind Regards
Rory
At 15:18 02/02/2006, you wrote:
>There is a modeling trick that can be used as a work around for more
>than one simple Ventilation object to act on a zone. 1) Create
>small, simple dummy Zone(s) that is/are not really part of the
>model. 2) Apply the extra Ventilation objects to those dummy
>zones. 3) Connect each dummy Zone to the actual Zone using pairs
>of Mixing objects with pretty high flow rates for good mixing.
Rory Walsh
UCD Energy Research Group
School of Architecture, Landscape & Civil Engineering
University College Dublin
Richview, Belfield, Dublin 4, Ireland.
http://erg.ucd.ie
Tel: +353-1-716 2682
Fax: +353-1-283 8908
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