[esp-r] Re: operation file - infiltration scheme with default interpolation function?

[Achim Geissler]

Hi Tobias

what you describe has bugged me, also. As far as I could see from the  
code this behavior is "default" (or better: unavoidable). It would be  
nice to

	a) have the changes between settings quicker *and*
	b) to be able to enter schedules with a higher frequency than 1/hour

via .opr. A recent code crawl did not reveal any easy path to achieve  
this to me, though. A good Bachelors Thesis for a student at  
Fraunhofer, maybe?  ;o)

Best
Achim


On Sep 29, 2010, at 4:40 PM, Tobias Zitzmann wrote:

> Dear users,
>
> I used an operation file to define the internal gains and infiltration
> flow rates for a simple room in winter case. Gains and infiltration  
> rate
> are 250W and 0.5h-1 between 7am-6pm; outside this period the values  
> are
> 20W and 0.1h-1. No operation control has been set up. The simulation
> time step is 5min.
>
> As I have expected, the simulation result shows a sudden raise of
> internal gains at 7am and a sudden decrease at 6pm. However, for the
> infiltration rate the solver seems to interpolate linearly between
> 7am-8am and between 6pm-7pm.
>
> Thus, the difference between the internal gain scheme without
> interpolation and the infiltration scheme with interpolation leads to
> significant 'room temperature humps' after 7am and 6pm.
>
> Is this linear interpolation procedure the default setting for the
> infiltration scheme in ESP-r? What is the reason for this and is  
> there a
> way to switch it off in the operation file? The only way I was able to
> get rid of the interpolation so far was to use a 5min time step  
> temporal
> file.
>
> Any comments are welcome,
>
> Tobias
>
> -- 
> Dr. Tobias Zitzmann
> Project Manager
> Dept. Thermal Systems and Buildings
> Fraunhofer-Institut für Solare Energiesysteme ISE
> Heidenhofstraße 2, 79110 Freiburg, Germany
> Phone: +49 (0) 7 61/ 45 88-55 82  Fax: +49 (0) 7 61/ 45 88-95 82
> tobias.zitzmann(at)ise.fraunhofer.de
> http://www.ise.fraunhofer.de
>
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achim.geissler at intergga.ch