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Doctorate in Mechanical Engineering, entreprenuer
Interests: diesel and gasoline engines, cars, aircraft, railroads, electric drives
Recent Activity
CheeseEater88 Most sewage treatment plants use digesters that convert the waste to methane. Normally, the methane is captured and used for power to drive the pumps etc.
I think that a plugin hybrid van for in city deliveries is a good idea but the article is completely devoid of any technical information on what size the battery is and what electric range might be expected, etc.
"Kawasaki aims to develop a large liquefied hydrogen carrier with a capacity of around 160,000 m3." This should provide the opportunity for an exciting accident. I did the calculations a few years ago for the amount of energy stored in the new large LNG tankers and came up with about a megaton TNT equivalent. You would not get a detonation but you might get a fireball with enough radiant energy to ignite any wood frame building in a 10 mile radius. It has not happened yet but given the number of shipping accidents, it probably will. There was an accident a few years ago where a LNG t-boned a smaller lumber carrier. See
HarveyD: Yes, 12 of these are safer than one larger unit as each unit is inherently a "walk away safe" unit. If every thing else fails, the unit will just power down without a thermal run away. Also, as they can be factory built, it is less likely that there will be a construction error. I did look up the size. They are about 15 ft diameter and 70 ft long so they are an oversize load but not an impossible to move load by rail or truck. As these would be expected to have an availability of greater than 95%, each 50 MW unit should be able to replace about 200 1.5 MW wind turbines without requiring energy storage or backup generation.
This is great news. I hope that the Design Certification process proceeds in a timely manner. It is also good to see that they have the first 12 units pre-sold and that they will be going into a current nuclear site. There is no scale on the drawing but I assume that these reactors can be moved as a complete assembly by truck or train. There was some information on these reactors and other new reactor technology in a recent PBS Nova program. I also hope that TerraPower’s Generation IV traveling wave reactor (TWR) makes it to market shortly. The TWR will burn natural uranium, depleted uranium and even spent nuclear fuel leaving very little waste.
SJC: I was and am deeply disappointed that none of the bankers that were complicit in the sub prime debacle were given prison time.
Yoatmon: Your calculations have some problems 53' x 0.3048 = 16.1544 m 8.5 x 0.3048 = 2.5908 m I rounded off a bit and took 16 m x 2.5 m = 40 m2 I took a solar irradiance of 1KW/m2 and 18% solar cell efficiency but I will use 22% and give you 220 w/m2. This is probably optimistic but I do not know how Panasonic did their measurements. Anyway, this would give you 8.8 KW. However, as the solar cells are not normal to the sun unless you are at the equator on the equinox at high noon, you need to correct for the angle of the sun. I took an angle of 40 degrees latitude and as the sun swings thru a -45 to +45 over 6 hrs I took a scientific wild ass guess of an average of 52 degrees off normal (which is probably a bit optimistic). So you need to correct by the cosine of 52 or 0.62. To get the correct answer you need to integrate over compound angle). See if you want more on this. So now you are down to 5.4 KW or about 32.5 KWhr over 6 hours. But the problem is that most tractors are running about 450 hp or 340 KW. I took a very liberal average power usage of 150 KW but something over 200 KW would probably be a better number. Some of the drivers that are running 80 mph (legal limit in a number of western states) are probably pushing the engine to max and maybe running closer to 550 hp or over 400 KW. Anyway, you would be very lucky to get 10 minutes of driving from this arrangement.
If the execs and employees are found guilty, I hope that they are given some prison time as an example. Oliver Schmidt was arrested last Saturday night in Florida and is in US custody but the others may be harder to take into custody.
Darius: With a US 53 ft long x 8.5 ft wide trailer, you have about 40 sq meters so you might get about 4.5 KW or about 6 hp. The trucks are probably using an average of at least 200 hp or 150 KW so you are not going to get far on 4.5 KW which is about 3% of the required power.
mahonj: I think that you are being a bit optimistic. I measured the roof of a typical hatch back and came up with 1.2 x 1.8 meters. If you use a solar cell efficiency of 18% and a solar flux of 1 KW/m2 (This is at the equator so this is really too much) you have about 388 watts but given a flat panel and a latitude of 40 deg (Kansas City) plus the sun sweeps thru an angle of -45 to +45 over 6 hours, you need to multiply this by the cosine of 52 deg (an optimistic guess as I am too busy to try to do the required integration). So you have an optimistic 240 watts or about 1.4 KW hr for 6 hrs. The Chevy Volt has 18 KW hr and gets about 57 miles so you might pick up about 4.4 miles range
"Do the math"? Are you kidding? Most people seem to have no clue about math or physics.
"The hybrid’s Continuously Variable Transmission (CVT) features a new Sport Mode setting that allows the driver to execute smooth yet quick “gear” shifts of the simulated 6-speed sequential shift transmission. The SE grade adds paddle shifters for increased fun and a more sporting driving experience." A even dumber feature for a dumb transmission.
"halve its total company CO2 emissions from 2000 levels by 2050"??? I would have thought that the goal would be to have no CO2 emissions before then. However 2050 is so far out that you have no idea what disruptive technology might be available by than. I can believe goals for 2020 because the design and manufacturing is already well underway for 2020. There is a fairly good idea what will be available for 2025 as research and development is already working on that but beyond 2030 is just blue sky. Honda does not even make heavy duty vehicles or other equipment that primarily uses diesel engines. This will be the type of equipment that will be harder to electrify. And even then, it should be relatively easy to halve the total CO2 emissions before 2030.
At least this concept is a real vehicle unlike the VW below. Figure on maybe 45 km (28 mi) SAE unless you try to impress everyone with the acceleration.
This is a concept vehicle and is not even a physical concept vehicle. It is just computer renderings thrown out to see if it stirs any interest in the automotive world.
OK, what are the specs for the 2170 batteries and when can I buy them.
I am a long ways past being a millennial but I would suggest adding optional all wheel drive and maybe the means to increase the ground clearance on demand. This morning I had to deal with some 6 inches of snow and the neighborhood had not been plowed. I would not have made it to work without 4WD. Also by Thursday, we are supposed to have another 8 to 16 inches of snow. Add some hills and 4WD become a necessity. Increased ground clearance would allow using the vehicle to be used off highway for camping. etc.
HarveyD: It is much easier to build a bus with a 350 miles range for stop and go city driving than it is to build an inter-city bus with a 350 mile range. IN stop and go driving, you are recovering the braking energy while with inter-city driving, most of the energy goes to overcoming air drag. This is why hybrid cars get better city mileage compared to highway mileage. Anyway, I am quite impressed with the Proterra buses and wish them the best.
It might go 300 km or 186 mi (EPA rating would probably be only a more realistic 225 km or 140 mi) on a single fill up of hydrogen and a fully charged battery but with only 5 KW of fuel cell power it would not go the distance on the highway as the power usage at any reasonable speed is more than 5 KW so once the battery is drained, you would need to wait until the fuel cell recharges it. It probably works as a urban delivery vehicle where it is stopped most of the time.
A nice looking and performing vehicle. I would have 2 requests--AWD and the same mileage ratings worldwide. If you look at the earlier post, you will see that the EPA all-electric range is 37 miles while the China rating is 50 miles. Same vehicle -- different rating agencies. I expect that the AWD is more likely to happen any time soon.
SJC: My comment was not intended to be a snarky answer. I had asked a legitimate question on where the energy came from as the article was not clear on that point and I get back from you what might be considered a snarky answer that it uses less energy. OK, but what is the source of the energy?
SJC: When you oxidize Carbon to form CO2 (burning coal for example), you get energy out. To convert CO2 back to carbon you have to put energy back and as none of the processes run at 100% efficient, you need to put in more energy than you got out. Generally speaking, a catalyst will allow the reaction to run with less wasted energy but you still need to put in more energy than you got out. If you do not understand this, read up on the laws of thermodynamics. I was asking where the energy came from. You could be getting energy from transforming the iron to iron oxide but then you need to put energy back to reduce the iron oxide back to iron. As an interesting side note, my company used to run a CNC plasma cutter with a water table (it has since been replaced with a fiber laser) Periodically, we would have to clean out the bottom of the water tank which contained scrap and what was essentially iron shot. When we would dump to barrels of the wet waste into a larger container for recycling, the workers commented that it stank. I recognized that the odor was ammonia as the iron was stripping the O from H20 to form iron oxide and the freed hydrogen was combining with nitrogen in the air to form ammonia. The iron also acts as a catalyst for this reaction. There was also some white crystals being formed which might have been ammonium nitrate but I did not try to test this hypothesis:)
OK, but the article is not clear on where the energy comes from. Sun light or solar energy? You can not reduce CO2 without an input of energy.
Davemart: Many of the new Tier 4 Final engines have DPF systems which stands for diesel particle filter and do filter particles (soot) from the exhaust and periodically burn off the accumulated soot. Also many diesel engines have SCR which is selective catalytic reduction which gets rid of NOx. Anyway, Hyundai's claim is simply playing with numbers in that it will accumulate up to some many milligrams of particles per mile driven. You could probably make the same type of claim that a diesel engine with a SCR system would eliminate NOx from the atmosphere but I would consider both of the claims as rather bogus. Last post on this subject from me.
Davemart; I read your reference and I understand what they are saying. They are simply saying that with sufficiently dirty air, the fuel cell vehicle is capable of filtering so many mg of fine particles every km or mile it is driven and this might be the equivalent to the particles emitted by so many diesels. However, if the diesel engines had a exhaust particle filter and put out almost no particles, it might clean the air from 1000 or more diesel cars. Anyway, this is a rather bogus claim and is certainly not a claim I would want to quote. The new Tier 4 final diesel engines have the same property of actually having exhaust that is cleaner than the intake air in some of the more polluted cities in the world but I would not recommend running more diesel engines to clean the air. Anyway, I will stick my initial comment that they would be off running Battery Electric Buses instead of Fuel Cell Buses. Look at the ABB article further up the column. In my opinion, this makes much more sense but the Proterra buses probably have enough range for a full day's operation without intermittent recharging.