Wind loads on large solar arrays on flat roofs (2)
report
The market for building added solar energy systems is developing rapidly. As a result new products appear constantly on the market. Solar energy systems should be de signed to withstand the loads that act on them during their lifetime. Wind loads are often the most dominant load for the design of fixings or added ballast weight. The European standard for wind loads does not provide specific values for solar energy systems on buildings. Since 2000, codes and guidelines have been developed and values based on existing knowledge have been incorporated into guidelines, interna tionally as well as in the Netherlands. The Dutch NVN 7250, published in 2003, was the first pre-standard concerning the building integration of solar energy systems. Up until now it has the status of pre standard. The NVN 7250 is currently being updated to an official standard, NEN 7250. The wind loading values included in the pre-standard are based on full scale and wind tunnel experiments from TNO, done in 2002, [8]. A frequently asked ques tion by the industry is whether the wind loading data could be updated to cover more types of systems and to provide more specific information for their systems. Wind tunnel research is found costly for individual suppliers and manufacturers of solar energy systems. Also, results of research for individual parties are not publicly available to be used by others and in new guidelines or standards. In a joint initia tive of suppliers and manufacturers of solar energy systems and Agentschap NL a parametric wind tunnel experiment has been performed to provide new wind loading data for solar energy systems places on flat roofs. The results of this research will be included in the new NEN 7250.
Topics
TNO Identifier
472530
Publisher
TNO
Collation
120 p.
Place of publication
Delft