- #1
voltech444
- 32
- 1
I have been thinking of a concept for a class 7-8 semi-tractor trailer that is hybrid electric. The basic idea is a fully electric drive system that propels the truck with electric motors only. A lithium-ion battery pack stores energy for the drive system. A diesel generator provides electricity to charge the batteries and motors. An ORC Scroll Expander (from Air Squared) is powered by the waste heat from the engine coolant and exhaust; the electricity from the scroll expander also provides charge to the batteries and motors. This combined cycle power-plant coupled to an electric drive train makes the perfect, most efficient hybrid electric vehicle available.
The coolant system for the diesel engine is modified to flow through the engine block and a heat exchanger in the exhaust manifold. This hot coolant then passes through another heat exchanger that has the refrigerant being pumped through for the scroll expander. In this setup most of the wasted thermal energy has been converted into electric energy.
Air squared offers 1, 5, and 10Kw scroll expanders with two options; oil lubricated or oil-free. The oil version offers an 80% efficiency, while the oil-free version runs at 70%. I'm in communication with them trying to figure out some of the details; like what type of oil does it uses and how often does it need to be changed. My guess is that the oil version will offer the highest pay-back on investment; so I would like to use the 10Kw oil version in my setup.
I've been trying to figure out the total thermal efficiency of the diesel engine and scroll expander. So if the diesel gets 40% efficiency that means there's another 60% lost as heat. If the oil scroll expander can capture 80% of that heat then the total efficiency would be: 0.4 * 0.8= 0.32 * 100= 32%+ 40%= 72% Is that calculation correct? Here's another: diesel 50%, scroll 80% 0.5 * 0.8= 0.4 * 100= 40% + 50%= 90%
Then, to get the MPG you would have to factor in the efficiency of the electric drive system. I will do that calculation tomorrow since it's getting late, but there's a lot more variables involved since it depends on the batteries, motors, motor controller; and a bunch of other things.
The vehicle could have a longer battery pack if it has access to regular charging;or a smaller pack if it's constantly over the road. Check out Air Squared's website, I think what they have is a breakthrough in waste heat recovery energy production.
There's a lot of different setups you could do to improve a vehicles efficiancy, extended-range electric vehicle, strong hybrid electric vehicle, mild hybrid electric, or non hybrid vehicle.
Thanks for you inputs!
http://airsquared.com/
The coolant system for the diesel engine is modified to flow through the engine block and a heat exchanger in the exhaust manifold. This hot coolant then passes through another heat exchanger that has the refrigerant being pumped through for the scroll expander. In this setup most of the wasted thermal energy has been converted into electric energy.
Air squared offers 1, 5, and 10Kw scroll expanders with two options; oil lubricated or oil-free. The oil version offers an 80% efficiency, while the oil-free version runs at 70%. I'm in communication with them trying to figure out some of the details; like what type of oil does it uses and how often does it need to be changed. My guess is that the oil version will offer the highest pay-back on investment; so I would like to use the 10Kw oil version in my setup.
I've been trying to figure out the total thermal efficiency of the diesel engine and scroll expander. So if the diesel gets 40% efficiency that means there's another 60% lost as heat. If the oil scroll expander can capture 80% of that heat then the total efficiency would be: 0.4 * 0.8= 0.32 * 100= 32%+ 40%= 72% Is that calculation correct? Here's another: diesel 50%, scroll 80% 0.5 * 0.8= 0.4 * 100= 40% + 50%= 90%
Then, to get the MPG you would have to factor in the efficiency of the electric drive system. I will do that calculation tomorrow since it's getting late, but there's a lot more variables involved since it depends on the batteries, motors, motor controller; and a bunch of other things.
The vehicle could have a longer battery pack if it has access to regular charging;or a smaller pack if it's constantly over the road. Check out Air Squared's website, I think what they have is a breakthrough in waste heat recovery energy production.
There's a lot of different setups you could do to improve a vehicles efficiancy, extended-range electric vehicle, strong hybrid electric vehicle, mild hybrid electric, or non hybrid vehicle.
Thanks for you inputs!
http://airsquared.com/