Justin McMillan Posted November 21, 2018 Report Share Posted November 21, 2018 Suggested best Model to apply for UK Based projects in reference to below: Model for Diffused Irradiation - Model for Irradiation on the Incline Plane - Im aware that the norm is to use Hoffman / Hayes and Davies but is this best option? Quote Link to comment Share on other sites More sharing options...
developer_mh Posted November 22, 2018 Report Share Posted November 22, 2018 Hi Justin, unfortunately there is no such "best" answer when it comes to irradiation, especially to the irradiation on the inclined plane. But I would recommend you to have a look at our help pages first to see how these models all connect (probably you are already aware of that): https://help.valentin-software.com/pvsol/2018/calculation/irradiation/ Then, in order to estimate the quality of the combination of the Hofmann model (for diffuse irradiation) and Hay & Davies (for the tilted plane) I would recommend these two papers which we published some years ago: The first one explains the Hofmann (my) model, and also validates it for 28 locations worldwide, 2 of which are in UK (Camborne and Lerwick) https://www.mdpi.com/1996-1073/10/2/248 The second one uses a bunch of irradiation models and combines them together, for different time resolutions as well (as the models behave very differently when using one hour or one minute time steps) https://www.mdpi.com/1996-1073/10/10/1495 The outcome of this is that the combination of Hofmann and Hay&Davies can be considered as the most "trustworthy". But we (the community in general) do not have much measurement data for the irradiation on the tilted plane, so the validation is difficult there. For Hannover, Germany and Boulder, USA we made a study that searched for the "best" model for the tilted plane: https://www.mdpi.com/1996-1073/10/11/1688 Another very interesting study on that topic, but again without measurement data from UK is this one from Dazhi Yang: https://www.sciencedirect.com/science/article/pii/S0038092X16302432?via%3Dihub And, finally, a good study that examines various diffuse models, espacially for UK (unfortunately the Hofmann model was not included, BRL wins): https://www.mdpi.com/1996-1073/10/2/181 Kind regards, Martin Quote Link to comment Share on other sites More sharing options...
Justin McMillan Posted November 22, 2018 Author Report Share Posted November 22, 2018 Martin, many thanks for the information, I will have a good read up and decide form there. kind regards Quote Link to comment Share on other sites More sharing options...
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