This study presents a new concept that combines microtechnology with solar thermal energy to provide a free portable
energy source. A water-methanol mixture flows through an array of parallel microchannels which are fabricated into a
silicon matrix using conventional micro-fabrication techniques. A vacuum layer is interposed between the channels and
the external surface to thermally insulate the channels from the ambient temperature. A selective coating is deposited on
one of the vacuum walls to absorb the short wavelength incoming radiation and reduce the long wavelength radiation,
hence reducing the heat losses. A geometry and material optimization is still being developed in order to obtain the
highest possible efficiency for the micro-heater, while keeping a low pressure drop in the micro-channels. The methanol
outlet temperature is predicted to be higher than 250°C. This temperature is required for hydrogen production in a
methanol reforming micro-reactor. Therefore, it is envisaged that the micro-solar heater will supply the thermal energy
needed for hydrogen generation, that can later be used as fuel for microfuel cells. Both technologies can be integrated in
a portable device.
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