The data presented assume continuous tracking of the sun throughout the day. Data for two-axis trackers represent the maximum solar radiation at a site available to a collector. Tracking the sun in both azimuth and elevation, these collectors keep the sun's rays normal to the collector surface. These instruments see only the sun's disk and a small portion of the sky surrounding the sun. A table shows average climatic conditions by listing monthly and yearly values for various parameters.
Degree days indicate heating and cooling requirements of buildings.
They are defined as the difference between the average temperature for the day and a base temperature. If the average for the day is greater than the base value, the difference is designated as cooling degree days. All Rights Reserved.