JBee
Well-known member
- First Name
- JB
- Joined
- Nov 22, 2019
- Threads
- 18
- Messages
- 4,752
- Reaction score
- 6,129
- Location
- Australia
- Vehicles
- Cybertruck
- Occupation
- . Professional Hobbyist
Purely hypothetical conjecture.Very true that using the AC system in reverse to heat the vehicle is one difference between the new Teslas and other cars. But to the point of this discussion, the other main difference is that in ICE vehicles, the pump is powered by the main engine. The power the pump takes from the engine is typically inconsequential compared to ICE’s inherent losses. Where on a BEV, the power used by the pump matters and can noticeably affect range. Tesla most likely does a very careful balancing act to size the pump to give the best cooling performance while minimizing losses.
In college I drove an ‘86 Buick Regal that had a V8 engine. If I left the AC on “Max” for to long I could turn that car into a meat locker. On a particularly hot humid day, I started it and left it running with the AC on to cool it off. Condensation started to form on the outside of the side windows. I still remember the chill I felt getting into that car that day. (Yes I realize the multiple layers of wastefulness in this story. But god, did I love that about that car.)
First law of thermodynamics is that energy cannot be created nor destroyed. You did nothing wrong by leaving the V8 running the A/C, except bring about some premature entropy....thx Bill!
Even with the octovalve setup and heat pump Teslas still rely on resistive heating when COP falls under 1 with low external temperatures.
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