Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
You may find it easier to consult BigLadderSoftware's online EnergyPlus documentation (the links below refer to v8.3, as per your link - you can consult documentation for other versions here).
Chapter 5 on Climate, Sky and Solar Calculations e.g. from weather data to direct/diffuse components, EnergyPlus' Sky Radiance Model, as well as Solar Gains. Chapter 6 is also quite relevant with regards to your question.
