[Bldg-sim] Modelling of ceiling fan

[Joe Huang]

I think this level of detail in modeling is unnecessary. In fact, I don't think there's 
need for any enhancements to the thermal modeling
of the building to assess the comfort benefits of ceiling fans.   Ceiling fans do not 
change the thermal conditions of the space (except for
a little added heat generated by the fan motor).  It provides comfort through air motion 
experienced by the occupants.   The improved
comfort can be quantified explicitly using Fanger's equation,  or implicitly if you 
calculate an equivalent temperature to that with still air.

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 7/27/2011 3:41 AM, Paul Carey wrote:
> Hi Deepak
>
> I think you can specify destratification fans so that would essentially be the same. 
> Other than that you could try splitting the zone in 2 and letting internal air transfer 
> between the zones work out the exchange but that's not really the ideal way to do it.
>
> Otherwise you probably need to think CFD and you'd be in the realms of moving mesh 
> transient CFD then and I wouldn't recommend that.
>
> Not an easy one to solve really.
> Regards
> Paul
>
>
>
> Sent from my HTC
>
> Dr Paul Carey
> Director
>
> Zero Energy Design Ltd
> 10a Portland Place
> 2-22 Mottram Road
> Stalybridge
> Cheshire
> UK
> SK15 3AD
>
> Tel - +44 161 3386200
> Mob - +44 789 4098012
> Email - paul at zed-uk.com
>
>
>
> ----- Reply message -----
> From: "Deepak Tewari" <deepak.tewari at teri.res.in>
> Date: Wed, Jul 27, 2011 08:34
> Subject: [Bldg-sim] Modelling of ceiling fan
> To: <bldg-sim at lists.onebuilding.org>
>
> Dear All,
>
> Is it possible to model the effect of ceiling fan on thermal comfort
> conditions in Energyplus for hot and dry Indian climates.
>
> Thanks in advance for any suggestions.
>
>
>
>
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