Regenerative Fuel Cell

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Regenerative Fuel Cell ( regenerative-fuel-cell )

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APPENDIX A METHOD USED TO ESTIMATE SHIP DISPLACEMENT When displacement wasn’t available from the open literature it was estimated from ship dimensions. The first step in calculating displacement is to find the submerged volume: π‘†π‘†π‘‚π‘‚π‘†π‘†π‘šπ‘šπ‘’π‘’π‘π‘π‘”π‘”π‘’π‘’π‘‘π‘‘ π‘‰π‘‰π‘π‘π‘™π‘™π‘‚π‘‚π‘šπ‘šπ‘’π‘’ [π‘šπ‘š3] = 𝐢𝐢𝑏𝑏 Γ— (𝐿𝐿𝑝𝑝𝑝𝑝[π‘šπ‘š] Γ— 𝐡𝐡 [π‘šπ‘š] Γ— 𝑇𝑇 [π‘šπ‘š]) Where Cb is the non-dimensional block coefficient, Lpp is the length between perpendiculars (approximately the length of the ship along the waterline), B is the beam, and T is the draft. Due to limited availability of Lpp data, the overall length (LOA) was substituted instead, which introduces an over-estimate of actual submerged volume and thus displacement. Block coefficients for each vessel were also not known so typical block coefficients for different ship classes were used instead, as shown in the table below41. Where a range is given the average was used. SHIP TYPE BLOCK COEFFICIENT (Cb) AVG Cb LIGHTER 0.9 0.9 BULK CARRIER 0.80-0.85 0.825 TANKER 0.80-0.85 0.825 GENERAL CARGO 0.55-0.75 0.65 CONTAINERSHIP 0.50-0.70 0.6 FERRY 0.50-0.70 0.6 FISHING VESSEL 0.55 Total ship displacement was then calculated through the submerged volume and the density of seawater: π·π·π‘†π‘†π‘€π‘€π‘†π‘†π‘™π‘™π‘€π‘€π‘†π‘†π‘’π‘’π‘šπ‘šπ‘’π‘’π‘‘π‘‘π‘‚π‘‚ [π‘˜π‘˜π‘”π‘”] = π‘†π‘†π‘‚π‘‚π‘†π‘†π‘šπ‘šπ‘’π‘’π‘π‘π‘”π‘”π‘’π‘’π‘‘π‘‘ π‘‰π‘‰π‘π‘π‘™π‘™π‘‚π‘‚π‘šπ‘šπ‘’π‘’ [π‘šπ‘š3] βˆ— πœŒπœŒπ‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†π‘†[π‘šπ‘šπ‘˜π‘˜π‘”π‘”] Where 1025 kg/m3 was used for the seawater density. 3 41 Van Dokkum, Klaas. Ship Knowledge. 9th ed. Vlissingen, The Netherlands: DOKMAR Maritime Publishers BV, 2011. 69

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