Re: [EnergyPlus_Support] wind speed vs electric consumption

["Michael J. Witte" <mjwitte@xxxxxxxx>]

My apologies for the delayed response.

Higher wind speed will increase exterior convection coefficients and may 
increase INFILTRATION flow rates depending on the coefficients used.  During 
the daytime, the increased convection helps cool surfaces which are hotter than 
the outdoor dry bulb due to incident solar.  During the night, if the outdoor 
dry bulb is warmer than the inside zone temperature, then increased convection 
increses heat transfer from outside into the envelope.

Mike


On 28 Sep 2004, at 10:24, HSIEH Chun-Ming wrote:

> Hello,
> 
> I was doing a kind of sensitive analysis (pretty rough one).
> I  changed the wind speed from 0,1,2, 3,4 to 5
> to see how the wind speed affects the heat rejection (or say electric 
> consumption) of window type air conditiopners
> in the same building with the same schedule.
> 
> The results showed
> 1. During the daytime, the electic consumption (heat rejection) of air 
> condioners is getting lower as the the wind speed increases.
> 2. At night (after sunset and before sunrise), the electic consumption 
> (heat rejection) of air condioners is getting HIGHER as the the wind 
> speed increase goes up. That means we need more electric consumption 
> when there is  windy outside at night.
> 
> I think result 1 is reasonable, but I wonder how to explain the result 2.
> do you have any ideas about that? Thank you very much.
> 
> Chunming
> 
> 
> 
> 
> 
> 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 not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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