[esp-r] Re: Temporal file

[paul strachan]

Dear Ali,

Regarding the measured vertical solar radiation, the only way at present 
to use this is to use a facility in the simulation toggles of the 
simulator (note password is 101). If you put the measured data in a 
single column in a text file, then you can use this in the simulator - 
note you will need to make sure that the data includes simulation 
start-up days and use simulation timesteps to correspond to the data in 
the file.

As ESP-r needs the direct and diffuse radiation separately, ESP-r uses 
the data in the climate file to calculate the direct and diffuse for the 
vertical surface. It uses the resulting direct/diffuse ratio to split 
the measured solar radiation into its direct and diffuse components.

For control, it is possible to switch between different optical 
properties based on the surface irradiation - go to the construction 
file and select  "transparent layer properties".

Thanks for your observations on the channel flow convection algorithm - 
we'll look at this.

Regards
Paul

Ali fallahi wrote:
> Dear All,
>
> I am modeling a double-pane window with ESP-r and then comparing the
> results with measurements from outdoor test cell. I got these problems
> in modeling:
>
> Radiation:
>
> 1- My measurements are global vertical solar radiation. Is there any
> way to use these data directly as input to ESP-r or it needs to be
> decomposed to its components first? I tried to use "short timestep
> (temporal) data / GLOVRTT" but it didn't work and I got this message "
> No data found, pick another type! "
>
> 2- In the case that I want to use controllers to sense direct normal
> solar radiation incident on a specific surface , which "control law"
> would be more appropriate?
>
>
> Convection:
>
> For Convection coefficient correlation from "Bar-Cohen and Rohsenow
> for buoyancy driven flow in vertical channels" when referring to
> source code it seems that in calculation of Rayleigh number, beta (
> thermal expansion coefficient) is 1/Centigrade instead of being
> 1/Kelvin! Moreover, if this correlation is used for more than one
> zone, trace facility shows that  IAORZ has always one value and that
> is the latest value specified in HTC file instead of having different
> values for different air origin zones.
>
> I would be pleased if someone could answer my questions.
>
> Best Regards,
> Ali Fallahi
>
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> esp-r at lists.strath.ac.uk
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>   

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Dr P A Strachan                   email: paul at esru.strath.ac.uk
ESRU, Dept. of Mechanical Eng.          phone: +44 141 548 2041
University of Strathclyde                 fax: +44 141 552 5105
Glasgow G1 1XJ, UK                 http://www.esru.strath.ac.uk
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