OpenStudio and plugins

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I am Mechanical engineering last year student and working on a project that calculates the heating and cooling load of staff houses. I created model with sketch up. then i get weather values such as dp temp. solar etc. on excell and trying to create a weather file that will be used in OpenStudio. My question is how can i create that weather file for a year and it is going to be used in OpenStudio? and also can you give me a work flow briefly for the all heating and cooling load calculation process. thank you for your interest.