Category: Renewable Energy

The Solid-Oxide Fuel Cell (SOFC)

In the SOFC, a thin ceramic layer of yttrium-oxide-doped zir­conium oxide (YSZ) serves as electrolyte, allowing the pas­sage of oxygen anions at its operating temperature of 900 to 1000° C. The power output of the systems currently being test­ed ranges from one kilowatt for household energy provision using natural gas up to a pressure-driven 200 […]

Hydrogen in the Gas Tank

As the lightest element, hydrogen has a high mass-specific energy storage density of 120 MJ/kg. This corresponds to about three times the storage density of diesel fuel, at 43 MJ/kg, referred to the so-called lower heating value. How­ever, this physically favorable property of hydrogen cannot readily be applied in a technological setting. While an automobile […]

Electric Automobiles

by Andrea Vezzini Electric cars indeed operate emission-free when the pow­er for charging their batteries comes from renewable sources (Figure 1). Even when their power is generated from fossil sources, they show a good C02 balance, since they utilize the electrical energy very efficiently. Our mea­surements at the Bern University of Applied Sciences in Biel, […]

Existing OWC Projects

Between 1978 and 1986, in an international experiment ini­tiated by Japan, an OWC system was tested for the first time on a large scale: The ship Kamai’ carried out three series of tests in the Japan Sea in which turbines with up to a megawatt of power output were installed. Only in 1998 was the […]