This book is the first volume of a new ser ies on solar energy researeh and developnent whieh is earried out in the European Communi ty. The Commission of the European Cammunity's Directorate General (XII) for Researeh, Scienee and Edueation is eurrently implementing, on a eost-sharing hasis, a solar energy R+D programme through eontraets wi th European industry, researeh institutions and universities. This programme eovers the following sectors : Project A Solar Energy Applieations to Dwellings project B Thermo-mech. Solar Power Plants project C Photovoltaie Power Generation project D Photochemieal, Photoelectrochemical and Photobiological Processes project E Energy fram Biamass project F Solar Radiation Data project G