Dids
Well-known member
- First Name
- Les
- Joined
- Dec 21, 2019
- Threads
- 8
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- 1,766
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- Location
- Massachusetts
- Vehicles
- 04 Tacoma, 23 Cybertruck
- Occupation
- Self
I hear you but do respectfully disagree. I did know what you were saying but took pains to point out that what you are saying also means that a ln EV is less effected by a change in load. It does not matter if that change is aerodynamic or weight etc. My disagreement and attempt to lead you to a physical truth is what matters is energy conversion rate. I am trying to convince you that energy density does not matter, that it doesn't change and therefore is irrelevant.Sorry I think we might be talking past eachother. Let me try again.
There are two distinct sides of the range "coin" conversation. One is vehicle energy consumption, or rate of work, the other is available energy capacity to do said work.
So given these two distinct sides, we can say that on a EV the energy "consumption", or work, that is caused by weight is less pronounced as it is on a ICE. Thats fine.
But, range is a consequence of energy vs work, and in the case of a ICE, its fuel energy storage "battery" is simply some 5x the "usable size" of a CT TM battery in kWh to the wheels. So even if the ICE had twice the consumption of the EV because of the load* the ICE would still have 2.5times the range.
So effectively EVs have less weight induced consumption (mostly because of regen), but ICE still have much more available energy.
(*load being weight, and weight having the effect of increasing rolling resistance, which is only part of the total drag according to the previously posted graph.)
BTW ICE typically have maximum Carnot efficiency at max RPM/Power. So that would be a correct assumption but not my point here.
I am trying to make the point that the increase rate of energy consumption as work increases is the most important factor in this problem and that you are wrong to assume that an EV is effected more by an increase in load.
Everyone knows that a diesel is effected less by an increase in load than a gas engine. It is unfortunate that some engineers think this is due to energy density of the fuel. It is not. It is purely a function of converstion by the powerplant. A diesel has a higher torque component of the power and therefore experiences a lower rate of increase of energy required as load increases, an EV has an even higher torque component of power. It will experience an even lower rate increase of energy required as load increases. It doesn't matter if that load is aero or weight.
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