Аннотация
The randomly varying nature of both global and beam radiation on
a yearly basis is investigated. Based on nearly 3000 days of simultaneous
hourly horizontal global and normal beam radiation data for Bet Dagan,
Israel, utilizability curves based on daily total radiation are found
to be a good approximation to the corresponding curves for individual
hour pairs, and the random nature of fluctuations in radiation about
clear day values can be observed. A model which treats insolation
as a stochastic variable is shown to provide accurate predictions
of daily utilizability curves.
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