10-11 mpg is pretty good for a semi especially with a load. My 2002 tundra can barely do 16 mpg. Piss poor! thats why the ERX is such a game changer with diesel is about to hit $5 per gal here in Houston. Thanks for this detailed analysis! -LL
Your Tundra would do better if you drove it 500 miles at 65 mph with cruise control and only stopped for bathroom and coffee twice. But most people don't drive their personal vehicles the amount that we drive semi's. If you do take a road trip one day, try that method. I bet it gets 22mpg
Dex, I’ve been checking out turbine engines in hybrid trucks. A small private company Wrightspeed has made some busses & garbage trucks with turbines. Microturbines are light (600 pounds vs 2900 for 15L diesels), but limited to about 42% efficientcy (Capstone brand, although many limited to 30%). Power plants run combined cycle turbines where the natural gas turbine (that generates electricity) produces waste heat that is used generate steam to drive another turbine blade (creates more electricity) that increases total efficiency to 63%. So could Mr. Healy be working on a combined cycle turbine hybrid? GPPS Journal vol. 4 2020 has an article on this taking a turbine from 30 to 44% using combined cycle “Hybrid electric powertrain for long-haul trucks”. In the article they say a diesel is 50% peak efficient, but 11% at idle. The Hyliion turbine would only run at peak efficiency when the battery is low & turn off when the battery is charged. Diesel engines run all the time (peak efficiency or idle or in between) so the average efficiency will be below 50%. If Hyliion could get a combined cycle turbine to run between 50 to 63%, then it would be game over for diesels. MPG for a CNG combined cycle turbine would be off the chart, especially with regen braking/idling. Did you know there are regen shock absorbers too?
I did not know about the shock absorbers. That's pretty cool😎. I think your theory is valid interest of what healy has under the hood. Because...I can't find a video with the ERX hood raised. Nor did JMac show any in his recent vids. One ERX in the work bays I was not allowed to photograph. Plus healy won't talk about it other than it a "fuel agnostic generator". So. I am behind your research, because I myself have found they are tight lipped on the subject.
@@drivemixgame if they were going to put a simple turbine with no combined cycle heat recovery or a small CNG Cummins engine under the hood, then I see no reason to be secretive. Anyone can do that. However, combined cycle in a truck is a big challenge. First they need to put a heat exchanger in the turbine exhaust that could raise the temp of the fluid to 800-900F under pressure. Second this needs to go to a small turbine where they release pressure to drive a generator. Third once the pressure is released the steam needs to go through a radiator to condense it so it can go back into the heat exchanger. The economics of this would be beyond awesome.
Thank you so, so much for this great information and insight!
10-11 mpg is pretty good for a semi especially with a load. My 2002 tundra can barely do 16 mpg. Piss poor!
thats why the ERX is such a game changer with diesel is about to hit $5 per gal here in Houston.
Thanks for this detailed analysis!
-LL
Your Tundra would do better if you drove it 500 miles at 65 mph with cruise control and only stopped for bathroom and coffee twice. But most people don't drive their personal vehicles the amount that we drive semi's. If you do take a road trip one day, try that method. I bet it gets 22mpg
Thx for pointing that out. I missed the mpg
Thks my friend for the info, keep promote some insights. Personnaly, i will not complain when there is more and more physics ;)
Thanks Reda! I will try. Always happy to share my experiences.
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😎
Dex, I’ve been checking out turbine engines in hybrid trucks. A small private company Wrightspeed has made some busses & garbage trucks with turbines. Microturbines are light (600 pounds vs 2900 for 15L diesels), but limited to about 42% efficientcy (Capstone brand, although many limited to 30%). Power plants run combined cycle turbines where the natural gas turbine (that generates electricity) produces waste heat that is used generate steam to drive another turbine blade (creates more electricity) that increases total efficiency to 63%. So could Mr. Healy be working on a combined cycle turbine hybrid? GPPS Journal vol. 4 2020 has an article on this taking a turbine from 30 to 44% using combined cycle “Hybrid electric powertrain for long-haul trucks”. In the article they say a diesel is 50% peak efficient, but 11% at idle. The Hyliion turbine would only run at peak efficiency when the battery is low & turn off when the battery is charged. Diesel engines run all the time (peak efficiency or idle or in between) so the average efficiency will be below 50%. If Hyliion could get a combined cycle turbine to run between 50 to 63%, then it would be game over for diesels. MPG for a CNG combined cycle turbine would be off the chart, especially with regen braking/idling. Did you know there are regen shock absorbers too?
I did not know about the shock absorbers. That's pretty cool😎.
I think your theory is valid interest of what healy has under the hood. Because...I can't find a video with the ERX hood raised. Nor did JMac show any in his recent vids. One ERX in the work bays I was not allowed to photograph. Plus healy won't talk about it other than it a "fuel agnostic generator".
So. I am behind your research, because I myself have found they are tight lipped on the subject.
@@drivemixgame if they were going to put a simple turbine with no combined cycle heat recovery or a small CNG Cummins engine under the hood, then I see no reason to be secretive. Anyone can do that. However, combined cycle in a truck is a big challenge. First they need to put a heat exchanger in the turbine exhaust that could raise the temp of the fluid to 800-900F under pressure. Second this needs to go to a small turbine where they release pressure to drive a generator. Third once the pressure is released the steam needs to go through a radiator to condense it so it can go back into the heat exchanger. The economics of this would be beyond awesome.
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vun.fyi
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