outdoor experiments on a once-through single glazed solar air heater with perforated metal absorber plate were conducted to determine the practical effect of absorber plate porosity as well as suction air flow rate on the collector thermal efficiency and its total pressure drop. three aluminum absorber plates were made perforated by drilling circular holes with different diameter/pitch ratios i...

unglazed transpired solar collectors are widely used for heating outside air directly, these days. pre-heating ventilation air for large spaces and heating air for crop drying, are some of the applications of these kinds of collectors. the outside air is drawn straight from ambient, uniformly through the whole surface of a perforated absorber (transpired, dark-colored plate) exposed to the sun....

Various authors (1, 2, 3, 9) have reported that tritiated water as applied to plant roots does not fully exchange with water of various aerial organs, particularly leaves, even after long period of observation. This incomplete equality between tritium concentration in tissue water and external sources has been attributed to an inaccessible component of tissue water which does not exchange (2). ...

g1 Richard Hall MEng, AIEMA EngD Researcher, Steel Construction Institute, Surrey EngD in Environmental Technology, University of Surrey, Guildford, UK g2 Xiaoxin Wang MSc, PhD Research Fellow, Oxford Institute for Sustainable Development, Oxford Brookes University, Oxford, UK g3 Raymond Ogden DiplArch, PhD Professor, Oxford Institute for Sustainable Development, Oxford Brookes University, Oxfo...