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Sustainable Growth and Applications in Renewable Energy Sources Part 10

Tham khảo tài liệu 'sustainable growth and applications in renewable energy sources part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Parameterisation of the Four Half-Day Daylight Situations 171 Monthly average relative sunshine duration s Fig. 38. Occurrence probability of half-day situations during mornings Monthly average relative sunshine duration s Fig. 39. Occurrence probability of half-day situations during afternoons These probabilities of the occurrence of typical four daylight situations were derived from measurements in two different climate zones i.e. in Bratislava as well as in Athens. So it can be assumed that the dependence on monthly sunshine durations during morning and afternoon half-days could be valid not only in Central Europe and European Mediterranean regions but also world-wide. 172 Sustainable Growth and Applications in Renewable Energy Sources 5. Approximate redistribution of the four daylight situations in the yearly simulation of their occurrence In accordance with the probability study of the four daylight situations in Bratislava morning and afternoon data during 1994-2001 the check was done using Athens data gathered in a five year period 1992-1996 Darula et al. 2004 . Because the calculated probability had to be substituted by a concrete number of days within a particular month i.e. in integer numbers these had to correspond with sum of half-days in that actual month. The redistribution into half-days had to dependent also on the overall monthly sunshine duration so the redistribution model correlating the probability percentage and number of half-day situations had to be found. The best fit final solution is documented for the morning redistribution model with results shown in Fig. 40 as well as for afternoon in Fig. 41 with monthly relative sunshine duration data measured during mornings sm and measured during afternoons sa. 1.0 0.9 0.8 o Í 0.7 0.6 I 0.5 I 0.4 Redistribution model sm 0 92 Pm1 0 21 Pm2 0 56 Pm4 A sm 0 92 Nm1 0 25 Nm2 0 61 Nm4 Nm z 0.2 Athens morning averages 1992-1996 Bratislava morning averages 1994-2001 0.1 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 .