Menso Molag, Tunnelveiligheidsexpert 'Er kan best een alternatief bestaan voor het Oosterweeltracé van de BAM, maar Arup/Sum heeft dat niet. ' Volgens tunnelveiligheidsexpert Menso Molag wordt de kostprijs van veiligheid de achilleshiel van Arup/Sum. Menso Molag is een Europese tunnelautoriteit. Van 2000 tot 2005 was hij coördinator van SafeT, een Europees tunnelveiligheidsproject. Hij legde mee de basis voor de Europese tunnelrichtlijn. Vanuit Nederland kan hij, wars van de hele politieke Oosterweeldiscussie, naar de tunnel-brugconstructie van de BAM (met Lange Wapper) en de geboorde tunnel van studiebureau Arup/Sum kijken.
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‘Brandweer uren bezig om water uit kelders en tunnels te pompen’. ‘Ondergelopen kelders, woningen en tunnels’.
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This study evaluates the performance of a counter-rotating dual rotor wind turbine (CR-DRWT) with 2 m2 rotor radius equipped with a double rotational armature in an open jet wind tunnel. With only one similar-sized design previously assessed in a wind tunnel, this study offers valuable validation material for the literature. Through wind tunnel testing, the CR-DRWT confirmed earlier findings in literature and achieved a 15% to 50% increase in power output and a 10% increase in efficiency (CP) compared to a single rotor configuration at higher wind speeds (> 7 m/s). Though these gains were not observed at lower wind speeds (4–7 m/s). The simplified mechanics of a double rotational armature show promise for SWTs, as financial viability depends on reducing LCOE through efficiency improvements that maximize energy capture. The design's maximum CP values were below those achieved in previous field tests at larger scale highlighting potential for improvement for smaller sized turbines. To further explore the aerodynamics of CR-DRWT's, computational fluid dynamics (CFD) simulations are recommended, as they could provide insights into optimizing flow dynamics around CR-DRWT's. Finally, the study emphasizes the need for precise pitch angle and rotational speed measurements to improve the value of future measurements.
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