filtration
Latest
IBM solar collector will concentrate the power of 2,000 suns, keep its cool
Modern solar collectors can concentrate only so much energy for safety's sake: too much in one place and they risk cooking themselves. An IBM-led group is working on a new collector dish that could avoid that damage while taking a big step forward in solar power efficiency. The hundreds of photovoltaic chips gathering energy at the center will be cooled by the same sort of microchannel water cooling that kept Aquasar from frying, letting each chip safely concentrate 2,000 times the solar energy it would normally face. The collector also promises to do more with sunlight once it's trapped: since the microchannels should absorb more than half of the waste heat, their hot water byproduct can either be filtered into drinkable water or converted into air conditioning. As you might imagine, IBM sees more than just the obvious environmental benefit. When a receiver will generate about 25kW of energy while costing less to make through cheaper mirrors and structures, a fully developed solar array could be an affordable replacement for coal power that delivers greater independence -- picture remote towns that need a fresh water supply. IBM doesn't estimate when we'll see production of these collectors beyond several prototypes, but the finished work will likely be welcome to anyone frustrated by the scalability of current solar energy.
Powerless filtration system increases fuel cell efficiency
While we've been seeing methanol fuel cells pop up in all kinds of concept devices for a while now, there have been precious few actual shipping products that get their juice on with a fuel cell. That might be slowly changing, as a research team at the National Tsing Hua University in Taiwan has come up with a novel filtration system that increases the efficiency of methanol cells to potentially usable levels. The system, which is 10 times more efficient than conventional waste pumps, features a series of 100 50-micron holes that allow waste CO2 to escape out of the cell, while excess water is pulled off by a hydrophobic Teflon ramp (boy do we love those hydrophobic Teflon ramps!) that drives H20 molecules away from the methanol and into a collector. Since this method doesn't require any power to work, it's well-suited to cell phones and laptops, as the cells can be made smaller and quieter. While this doesn't mean we'll be seeing fuel cell Zunes anytime soon, you can bet those guys in Texas with the booze-powered robots just crossed a big X off their dev charts.(Photo is of an unrelated Toshiba fuel cell concept.)[Via DailyTech]
