[esp-r] Re: Naturally ventilated office cooling loads

[Achim Geissler]

Dear Cathal

what was your (constant?) air change rate without the natural ventilation and what is your air change rate (wind/buoyancy driven) with natural ventilation at times where external temperature is below your heating set point? Did you plot supplied heat, ambient temperature and air change rate vs. time in res for both cases? Possibly you can find the explanation there.

Best
Achim



On Apr 19, 2011, at 7:32 PM, Cathal Quinn wrote:

>  
> Dear All,
>  
> I am currently modelling an office space and comparing a simple heating/cooling scenario with a naturally ventilated scenario
> The control parameters I have implement are from 22-26 degrees with my windows set to open using the range based command from 23-26 degrees with the high setpoint at 24. My simulation period is from April to September (cooling season) using the Dublin weather file. Its quite a similar scenario setup to the training model on natural ventilation included with the ESP-r distribution. My question is simply can anyone provide me with a clear explanation as to why introducing a natural ventilation strategy such as this increases my heating load quite substantially. I know its probably the voice of inexperience talking but I would have imagined the heating load to remain relatively constant while the cooling load drops 
>  
> Thanking you in advance for any help provided
>  
> Kind Regards
> Cathal
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achim.geissler at intergga.ch