Module Properties poly-Si Module Unit Value Power capacity W 200 Efficiency% 13.50% Area m 2 1.48 Nominal operating cell temp. For advanced solid polymer or alkaline electrolyser, the electric efficiency of the industrial process overcomes 75%. It has evaluated the economic feasibility of photovoltaic hydrogen production that making a conservative hypothesis on the prices of hydrolytic hydrogen (evaluated one-fifth of average helium cost). In a preceding paper, Dumas has estimated that the necessary hydrogen can be produced in one year with a large photovoltaic facility with the characteristics reported in Table. A parameter, defined V eff, has defined for hydrogen and helium airships. The hydrogen mass has also been evaluated in 29.44 tons while helium mass in about 61.53 tons. Number of persons Mass (kg) Passengers 480 48000 CFreight 12000 Total passengers and freights 62500 Structure 150000 Energy conversion 60000 Energy storage 50000 Propulsion 40000 Total System Weight 300000 Total Weight 362500 Both Hydrogen and Helium balloons has been estimated and it has been observed that helium balloons results about 1.084 times larger than hydrogen ones. Safety considerations has been also taken into account. It has been previously applied to transport airship shapes with interesting results and on MAAT system. This design methodology - defined Constructal Design for Efficiency – aims to finalize an optimal design which can solve the energetic issues related to the MAAT cruiser-feeder system. He has finally proposed final formulations based on a dual cycle design method with a preliminary design method: the first aims to the definition of the optimal system on the basis of Constructal principle and second principle of Thermodynamics, the second aims to produce an effective optimization of the internal subcomponents of the system. Starting from the generalized formulation of the second principle defined by Adrian Bejan and defined Constructal Law, , he have developed a novel design method which can overcome the theoretical limits of the bottom-up design approach. On the other side Trancossi has focused on the conceptual design methodologies to perform an effective system design optimization. Tuveri is developing an innovative mesh based approach for the estimate the added masses to an unconventional unmanned airship.

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