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Egypt is bordered by coastal sea 2450 km, while incident solar radiation is in the order of magni- tudes of 1900-2200 W/m 2 in that area of the world. The present work is aimed to assess the hy- drogen production from the solar-hydrogen system composed of photovoltaic cell motivated by solar energy and supplies electricity to alkali electrolyzer. The electrolyzer uses sea and Nile wa- ter as electrolytes. Indoor tests are done to identify the optimum concentration ratio of the sea water to produce hydrogen. Experimental results showed that stand-alone sea water gives a higher production rate. The results of the outdoor tests revealed the need for about seven units of elec- trolyzer working with the sea water to produce the same amount of hydrogen that KOH solution electrolyte would provide. However, the efficiency of solar-hydrogen units working with the sea water gives a lower constant efficiency of about 0.13%, followed by Photovoltaic/electrolyzer unit using Nile water of approximately 0.005%. The KOH solution electrolyte provides an efficiency of approximately 8% at solar noon. The sea water is recommended to be used instead of KOH solu- tion in all coming electrolyzers.

Hydrogen Production from an Alkali Electrolyzer Operating with Egypt Natural Resources