Re: [TRNSYS-users] type 109 internal interpolation

["Diego A. Arias" <daarias@wisc.edu>]

Dear David,

If you follow the explanation in the mathematical reference (Volume 5 - 
Mathematical reference), the mode in Type109 that reads a user-written 
weather data allows for three options for interpolation: 'No 
interpolation', 'Linear interpolation' and 'Five point spline 
interpolation'.

When Type109 reads a TMY2 data file, it uses the 'Five point spline 
interpolation'.  It is based on this paper:
Hiroshi Akima, Interpolation and Smooth Curve Fitting Based on Local 
Procedures, Communications of the ACM, October 1972, Vol. 15, No. 10, 
pp. 914-918

Best regards,

Diego


David Garcia wrote:
> Dear trnsys-users,
>
>  
>
> I´m using type 109 for reading a TMY2 file with hourly data, but the 
> simulation time step is 0.6 hours.
>
> I would like to know which interpolation procedure does this type use 
> to generate climate data at hours that are not given in the TMY2 file.
>
> Thanks very much in advance.
>
>  
>
> David García Menéndez
>
> Ing. Industrial
>
> Dpto. de Física
>
> Universidad de Oviedo
>
> Edificio Departamental Este
>
> Campus de Viesques
>
> 33204  Gijón
>
> Tfno: 985 18 23 91 / 985 18 63 67
>
> Fax: 985 18 23 90
>
> e-mail: garciamdavid@uniovi.es <mailto:garciamdavid@uniovi.es>
>
>  
>
>  
>
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--

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706