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Onboard separation technology set to improve fuel economy:
A technology developed by researchers at the U.S. Department of Energy's Pacific Northwest National Laboratory could pave the way for increased fuel economy and lower greenhouse gas emissions as part of an octane-on-demand fuel-delivery system.
Designed to work with a car's existing fuel, the onboard separation technology is the first to use chemistry—not a physical membrane—to separate ethanol-blended gasoline into high- and low-octane fuel components. An octane-on-demand system can then meter out the appropriate fuel mixture to the engine depending on the power required: lower octane for idling, higher octane for accelerating.
Studies have shown that octane-on-demand approaches can improve fuel economy by up to 30 percent and could help reduce greenhouse gas emissions by 20 percent. But so far, the pervaporation membranes tested for octane on demand leave nearly 20 percent of the valuable high-octane fuel components in the gasoline.
In proof-of-concept testing with three different chemistries, PNNL's patent-pending onboard separation technology separated 95 percent of the ethanol out of commercial gasoline. The materials are also effective for separating butanol, a promising high-octane renewable fuel component.
More information: Katarzyna Grubel et al. Octane-On-Demand: Onboard Separation of Oxygenates from Gasoline, Energy & Fuels (2019). DOI: 10.1021/acs.energyfuels.8b03781
(Score: 0) by Anonymous Coward on Tuesday May 26 2020, @03:08PM (1 child)
That kind of power dissipation is hardly novel in consumer electronics; any old Pentium 4 heatsink laying around should do the trick. ;)
But typically, that wattage would be distributed among dozens of emitters covering a lot of area, such as an 8 foot linear fixture. GP said nothing to suggest it would be a single emitter.
(Score: 1) by anubi on Wednesday May 27 2020, @03:17AM
I've recycled a lot of Pentium heatsinks, but I consider the fan a failure prone item. I often repuopose worn brake disks to make outdoor lighting fixtures. They were made to dissipate heat.
I glue my 10watt LED chips on with silicone sealant,
cover the assembly in yet more silicone sealant, attach some hanging bolts on, and am good to go. Safe to string up in a tree. Just use aircraft cable...those things are heavy!
I've had some running for five years now. My design goal is they will work literally forever, or until rust consumes the underlying brake discs, which I usually acquire free.
These are custom lights I make for friends. They need to be more reliable than things I made under business environments.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]