| From Auxiliary Programs manual, page 55: "Historical weather data files in CD144 format do not contain solar data nor is such data generally available for a specific location and time period. In this case, ersatz solar data must be generated from cloud cover and other data using sky models and regression formulas. Currently, neither the Weather Conversion utility nor the EnergyPlus program synthesizes this data. However, the weather conversion utility can use any two of the commonly recorded data (i.e. two of Global Horizontal Radiation, Horizontal Diffuse Radiation and Direct Normal (or Direct Horizontal) Radiation to calculate the EnergyPlus primary solar data of Direct Normal and Horizontal Diffuse Radiation values)." This states that two solar values must be entered to derive the others. Please tell us more about how to derive direct normal and diffuse irradiation in the Weather Converter with just global horizontal. Thanks! --- On Fri, 6/5/09, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:
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