Since it is not economically feasible to build measurement stations at every
site where a solar system might be built, Task 9 researchers evaluated a large
number of techniques for estimating solar radiation for locations between
network sites or where the existing measurements are not adequate. This work
expanded on the resource assessment work of Task
4 and Task 5.
In a major validation exercise, 33 models from various countries were assessed
and those having the greatest accuracy identified. Various approaches for
deriving needed data were investigated, including classical statistical
techniques as well as new methods, such as satellite-based methods. Another
activity was concerned with recommending the most appropriate methods for
developing "representative design years" as input to solar system and building
Finally, the task focussed on demonstrating the improved quality of solar
radiation measurements now available with pyranometers and other instruments.
Guidelines were also developed for solar energy engineers on proper solar
radiation measurement procedures.