著者

渡部 朝史 村田 謙二 神谷 祥二

出版者

一般社団法人 エネルギー・資源学会

雑誌

エネルギー・資源学会論文誌 (ISSN:24330531)

巻号頁・発行日

vol.30, no.3, pp.10-18, 2009 (Released:2019-09-14)

参考文献数

23

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Expanding energy resources for electric power plants from fossil energies to cost competitive renewable ones are required for reducing GHG emissions and for coping with the soaring in imported fossil energies prices. Importing natural energy resources as storable and transportable hydrogen transformed from wind power electricity may be preferable, if a large quantity of windmills are constructed in the favored oversea regions, such as Patagonia, where steady and strong wind is blowing over wide area and its electricity cost becomes low. Three kinds of electricity generating systems, based on domestic land windmills, domestic offshore windmills and that composed of electric power plant utilizing imported hydrogen, as mentioned above, are designed and the electricity costs of net power flows from such three systems are derived by estimating construction and running costs for the elements of such systems from open references. The result shows that the electricity cost derived from oversea wind power is comparable with that from domestic land wind power, if the future improvements of energy conversion efficiencies of electrolysis and hydrogen liquefaction are considered, though the construction cost for the oversea wind power system is more than twice of that of the domestic land wind power system.

著者

高橋 勝國 斎藤 敏雄 柳島 淑隆 神谷 祥二 老固 潔一 岩田 章 増井 喜健

出版者

公益社団法人 低温工学・超電導学会

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.15, no.2, pp.97-110, 1980-05-25 (Released:2010-02-26)

参考文献数

18

被引用文献数

3

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This paper presents the results of a study on the pressure drop and the film boiling heat transfer for a two-phase flow of hydrogen in a horizontal tube.Experiments were made on two types of tube; two pieces of vacuum insulated straight tubes of 4m long, inside diameters of which are 18.4 and 23.9mm, respectively; Anuninsulated tube of 8m long with 90 degree bends at two locations, inside diameter of which is 12.3mm.Experimental conditions were as follows; Flow rate (l/min.); 5 to 50 Vapor quality; 0.01 to 0.90 Pressure (bar); 1.4 to 5.8 Conclusions obtained from the experiments are summarized below.1) The frictional pressure drop of two-phase flow of hydrogen for a straight tube is well related to a modified Lockhart-Martinelli (L-M) curve, that is, L-M pressure ratio parameter, φl multiplied by 0.8, for both adiabatic and diabatic conditions. More than 90% of data fell within the scatter band of ±20% from the modified L-M curve.The pressure drop for a bend was also correlated by using parameters analogically introduced from L-M parameters for a straight tube.2) As for the heat transfer by forced-convection film boiling, the following relationship was established based on the method proposed by Ellerbrock.(Nuf/Nufm)⋅Bo-0.4=9.46Xtt-0.131More than 90% of data obtained were in agreement with the the expression shown above with no more than ±20% error.In this study, it was known that the heat transfer for two-phase flow of nitrogen as well as hydrogen follow Ellerbrock's theory.