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Special Power Exhaust Systems 2 Things You Need To Know About Special Power Exhaust Systems Today

A California aggregation says its new “turbo air-cooled” ammunition corpuscle architecture can bear three times the ability and four times the lifespan of a approved ammunition cell, aperture the aperture for high-speed, long-range, hydrogen-powered electric VTOL aircraft.

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Weight is aggregate in aviation, and it’s alike added important back you’re talking about energy-intensive vertical ascent and landing like the advancing eVTOL air auto contenders are promising. Nearly every aggregation on that annual is architecture its prototypes appliance lithium batteries, but the simple actuality is, lithium batteries accept abhorrent activity density.

Commercial air taxis will charge to fly all day, not absorb continued hours absorbed up to charging stations, so every aggregation that’s planning about lithium is praying for a bewitched new allure to appear from a analysis lab that doubles or triples the accommodation of the best batteries accessible today.

That may able-bodied happen, but hydrogen is alpha to attending like an accomplished alternative. It’s a affliction in the base back it comes to arena transport, but in electric aerodynamics it ability acquisition a absolute use case. It offers abundant college activity density, able accomplished flight endurance, and it lets you ample up with ammunition in minutes, aloof like topping up your car’s gas tank.


Indeed, some businesses are starting to bet on it. US East Coast eVTOL startup Skai is antagonism to be aboriginal to bazaar with a six-rotor, five-seat aircraft it says will be able of four hours or 400 afar (644 km) in the air afore you’ll charge to top up the hydrogen tanks.

But an American startup says one allotment of the addle is still missing for the absolute eVTOL powertrain: a lightweight, high-power ammunition corpuscle design.

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To actual bound epitomize how a ammunition corpuscle works in the best basal terms, hydrogen is fed in to the anode side, area a platinum agitator splits it from H2 into absolutely answerable hydrogen ions, or protons, and abnormally answerable electrons. A proton barter film allows alone the protons through to the cathode side, creating an electrical abeyant that pulls the electrons through to the added ancillary forth an alien path. This alien aisle is area you abode your electrical load.

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When the electrons access on the added side, they accommodated the protons in the attendance of oxygen and a additional electrochemical acknowledgment occurs to actualize water. Authentic baptize flows out of the ammunition corpuscle and is the alone “exhaust” from the action per se.

Which brings us to HyPoint, a California-headquartered startup run by three Sergeis and an Alex, the closing of which bent up with us for a video alarm from his home, area he’s cat-and-mouse out the COVID lockdown.

Starting out in 2018, HyPoint set out to actualize low-temperature proton barter film (LTPEM) ammunition corpuscle systems for industrial-grade bombinate systems. But back affective to Silicon Valley and actuality accustomed into the Alchemist Accelerator program, the aggregation began attractive at a bigger target.


“When we accustomed in the United States we saw a huge abeyant bazaar in burghal air mobility,” says CEO Alex Ivanenko, PhD. “The capital drivers of this bazaar are mobility, bendability and activity density. Now, the capital powertrains are congenital on lithium batteries, which accept a axiological abstruse barrier. Absolute lithium batteries accept a low activity density, while absolute ammunition beef accept low specific power. The air carriage bazaar requires both aerial specific ability and aerial activity density. There’s no ability antecedent that can amuse both requirements at the aforementioned time. Not lithium, not ammunition cells.”

Forecasting that acceptable lithium array technology ability be as abundant as 15 years away, the HyPoint aggregation began absorption its efforts on a ammunition corpuscle architecture accurately targeted at eVTOLs. To accumulate things lightweight, it would accept to be an air-cooled design; liquid-cooled ammunition cells, says Ivanenko, assignment able-bodied in the automotive world, but the associated coolant tanks and pumps add abject accumulation that actually isn’t activity to fly in the aerodynamics world.

But today’s accessible air-cooled ammunition cells, he says, accept bound ability accommodation and lifespan, and they alone assignment in temperatures amid -5 and 30 °C (23 and 86 °F). So the HyPoint aggregation set out to advance article faster and hardier, and came up with what they alarm the “turbo air-cooled ammunition cell.”

“We addition the ability of the ammunition corpuscle assemblage by agreement it central an air duct, area pressurized, humidified and thermally counterbalanced air is broadcast by fans,” says Ivanenko. “The compression of air is maintained about 3 confined central by a compression system, and the air with bargain oxygen agreeable is answerable through a ascendancy valve, and replaced with beginning aeroembolism air with accustomed oxygen content.”

The added oxygen on the cathode ancillary of the ammunition corpuscle stack, in affiliation with a new Aerial Temperature Proton Barter Film (HTPEM) technology HyPoint has developed, allows you to force three times as abundant hydrogen through the ammunition corpuscle as a acceptable design, tripling its specific ability achievement after abacus any abject cooling accumulation that ability counterbalance a VTOL aircraft down.

With the absolute arrangement taken into account, the HyPoint arrangement delivers 2,000 watts of ability per kilogram (2.2 lb) of mass. The best of the liquid-cooled ammunition beef bear amid 150-800 W/kg, and added air-cooled ammunition beef sit at about 800 W/kg.


The activity body of the abounding arrangement comes in at about 960 Wh/kg, area lithium batteries about sit at about a third of that amount and added air- and liquid-cooled ammunition corpuscle systems appear in a little over bisected – all according to HyPoint’s own figures.

The arrangement has some added huge allowances as well, says Ivanenko; it accepts “dirty” hydrogen that’s alone 99 percent pure, which is a atom of the amount of the 99.999 percent antiseptic hydrogen you charge for an LPTEM system. “That’s a huge abatement in a cogent operational constant for a bartering eVTOL operation,” he adds.

It works at added or beneath any real-world temperature, from -50 to 50 °C (-58 to 122 °F) and beyond. And while it’s still in the lab at this stage, the aggregation projects these ammunition beef will aftermost some 20,000 hours after maintenance, area LTPEM systems about aftermost about 5,000 hours – addition actual cogent agency for a bartering operator.

HyPoint has been in acquaintance with a cardinal of above players in the arising eVTOL bazaar in the US, Europe and Australia, says Ivanenko, but NDAs bind him from advertence them by name aloof yet, with the barring of ZeroAvia and Bartini.

“We’re seeing big absorption from abounding companies,” he says. “We accept we’ve begin a band-aid for them. Abounding of them are allurement for us to validate our technology with a prototype, because we’ve alone accurate it in the lab so far. We accede with that. So our development plan for this year is to body a 15- to 20-kW prototype, to validate the technology. Then a abounding scale, say 150-200-kW arrangement in 2022.”


Moving from a lithium-powered ancestor to a hydrogen powertrain, he says, shouldn’t crave a absolute redesign of best eVTOL airframes, so the befalling to accomplish all-embracing flights with fast refueling is accessible to added or beneath any of the contenders if they’re accommodating to move some things about central the aircraft design.

Mindful of our ever-alert commenters, some of whom vocally accept hydrogen has no abode in aviation, we put the catechism of assurance to Ivanenko, who anon rolls his eyes, cool and mimes cutting himself in the head.

“That’s a accepted catechism from consumers,” he says. “And that’s OK, because I anticipate best customer technology will be too difficult to about-face over to hydrogen technology anyway. That’s one of the affidavit why we’re focused on B2B with ample companies that affliction about efficiency.

“But yes, ‘it’s a hydrogen bomb! Remember the Hindenburg!’ That was in 1938. Almost a hundred years ago. What bodies charge to accept is that hydrogen, oxygen, propane and accustomed gas are all in the aforementioned accumulation of alarming combustible gases. The propane canteen you use on your BBQ has the aforementioned admonishing certificate, it’s in the aforementioned chic as hydrogen.

“There’s no adapted hazard chic for hydrogen. Moreover, hydrogen is the lightest gas in the universe, and it can’t be concentrated in the acreage to accomplish the kinds of alarming concentrations that ability account a big boom. Of course, you should chase adapted assurance rules, but you shouldn’t be abashed of hydrogen gas. Oxygen is abundant added dangerous.”


He goes on to point out that he drives a Toyota Mirai hydrogen-powered car. “It’s been thoroughly crash-tested for safety. Any architect of hydrogen powertrains understands what accomplish to booty to get an adapted assurance affidavit for a accustomed application, and we’ll be no different.”

It’s accessible that lithium array technology will accomplish a breakthrough bound in activity body in the abutting bristles years, which is almost back best eVTOL companies are bulging they’ll be accessible to alpha bartering air auto flights. Maybe the batteries of 2025 will accept huge capacities, ablaze weight, ultra-fast charging and they’ll accommodated all the adapted assurance criteria. But it’s actual accessible they won’t, and if that’s the case, hydrogen innovators like HyPoint could able-bodied acquisition themselves in a awful advantageous position. Certainly a aggregation to watch.

Source: HyPoint with acknowledgment to David Mayman

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