P2 | Tesla Model Y Thermal management system with OCTOVALVE & HEATPUMP | Working in Detail

[@Ingineerix]

I just started an analysis of this system, which I will be posting on my channel soon. First off, there is no "LV" or even "HV" heater in the cabin. The older non-heat pump system in the Model 3 had a PTC heater running off HV. Tesla has never used an LV heater, that would be pointless. In any event, the HV PTC heater was removed on the heat pump system. The only extra electrical heat that can be injected into the system is from the drive unit, it can be put into a "total loss" mode where it just makes heat from electrical power. Also, looks like your coolant circuit is drawn wrong. First off, The radiator is not teed with the LCC. The radiator has it's own 2 ports on the octovalve. (the middle 2 on the bottom) There is no "9th pipe".

[@theredbaron7302]

Thank you so much, been looking for an explanation/analysis but this went beyond my expectations!

[@shyam163]

Excellent work . you are awesome (I scoured internet , you are the only one) , tesla engineers are awesome too . Rarely someone sees such beatiful pieces of engineering .

[@larryteslaspacexboringlawr739]

i put this on reddit in tesla investors club

[@mrshoney2624]

Very fascinating and very well explained, good animations great work thank you.

[@kschleic9053]

Excellent work! The best on KZbin.

[@UntangleClub]

Glad you think so!

[@jayshreedeshpande6912]

Genius 👍

[@JWardellTechEV]

Thank you for putting all this effort into the octovalve/heat pump explanation and excellent animations! Do you have a graphic comparing this to the model 3's 5-way valve system?

[@UntangleClub]

Check out Model 3's TMS with Superbottle 👉 kzbin.info/www/bejne/q5e0lYGLfJV0p7c

[@rohandeshpande7896]

You deserve more SUBSCRIBERS, keep it up 👍

[@lifeofwayne]

Hi bro, i'm a Chinese Tesla fan and a Chinese KZbinr. I learned a lot from this video about Tesla heat pump! Super helpful! Can i use this as a material to introduce "How tesla heat pump works" to Chinese audience? I will give you record and tell them this research is from your channel.

[@bulletbob]

Very clever dudes and dudettes at Tesla. Excellent video.

[@StormsparkPegasus]

The 2021 refresh Model 3 has this same system now too. (The Model 3 did not have this at the time this video was made.)

[@rahulchoudhary1466]

Great Video, Compressor has much work to do, for eg heat mode 5. Do you know the compressor power?

[@hrissan]

Worth adding that in modes 2, 3 the radiator blinds are closed, effectively reducing radiator cooling, otherwise seems a bit strange that when heat is scarce, fluid from warm battery/drive unit must pass radiator. Are you sure octovalve passes heated liquid through radiator in these modes?

[@mma008]

It can be either bypassed or shut the airflow at front shutter so heat exchanger becomes much smaller; bypass needs additional valve for cost, AGS works but additional system loss.

[@daveduran8158]

Very informative, max efficiency for evs

[@jamescoppe]

Great vid again!

[@garnikgg]

great videos, thanks for the effort; not clear if low-voltage heaters are really there, if so - why not used in other modes where battery/drive unit cant supply heat; I guess this is just direct interpretation of the patent; actual implementation may be different;

[@publicshared1780]

Such a great video, thank you. But I dont understand how Condition 7 works. It looks like the compressor (the funnel-looking piece below the "A") for heating is on but I am assuming the car is "off" and no one is inside, so the compressor isnt needed and would just be wasting energy. Can someone explain what is happening here please?

[@xenadu02]

In condition 7 the compressor loop is cooling the cabin (A/C is on) but instead of rejecting the heat to the atmosphere it stores the heat in the batteries by warming them up. That's for the reason mentioned: the batteries will stay hot for a lot longer than the cabin.

[@akashkumarmahtoprotech6855]

Keep it up

[@kevincolwell2115]

Love this explanation

[@trkarting]

I really like your work and respect what you study and share here, especially regarding octovalve. However, according to your explanation, in mode3, system can use heat coming from battery and in addition to this LV heaters does work. Its OK. But could you please explain why those LV heaters doesn't work in cabin, in damn mode4, although there is no heat coming from battery?

[@TeslaHere3]

I found that cabin condenser is the main heat source for most cases. Is it common for EV? Meanwhile, resistance heater is only activated in case #3, which is quite less and weird, since it is the main heat source of Model 3's cabin. Did I miss something?

[@trkarting]

You are right. I don't think Case#3 is the only case (below minus 10C) where resistance heater works.

[@oisiaa]

Incredible video!!!

[@jerrychen3819]

Great video! just a couple of questions below 1) In heating mode 6, why does the chiller need to be activated? 2) In heating mode 7, The driver is not in the car yet, how is it activated before the drive?

[@danielrose1392]

1) The coolant is at high pressure. Before entering the compressor again, the coolant has to be expanded somewhere. Options are your Chiller or Cabin Evaporator. Since the Cabin is inactive, only the chiller can be used.

[@mma008]

Tbh, mode 6 is fancy but really inefficient. When condenser heat cancels the chiller (it has no choice since there is no air condenser any more to exchanger from ambient), only available heating becomes your compressor power, likely low COP; in this case why not just a coolant heater with no losses from plate heat exchangers as well :)

[@iankathurimakinyua1145]

Im your first subscriber

[@Dupont550]

Does the model y still come with low voltage cabin heaters? Many people are having issues with heat right now. Maybe the vehicles don’t have low voltage heaters?

[@beltrams]

I don't think MY has LV cabin heaters. I think that under certain conditions, the motor/inverter is used in a way that intentionally uses low power factor power that causes the motor(s) to heat up. This heats the coolant flowing through the motors. The warmed coolant then goes to the chiller, warming the refrigerant, then through the compressor and into the cabin condenser to warm the cabin. This, anyway, is what I think I have observed in Service Mode in my summer 2023 Fremont-built MYLR. One can see the front and rear motor/inverter temperatures spike. I'm thinking some parts of the modes shown in this, now 3 year-old video, aren't applicable for newer M3 and/or MY.

[@imranlivesit]

Good Job 👍

[@sgerardschulte7691]

what does the "chiller" do? normally a chiller is a compressor, a condenser and an evaporator...

[@Lav-v9c]

I dont think the Octovalve system has any PTC heaters at all

[@charliedevine6869]

This is the antithesis of Keep It Simple Stupid philosophy.

[@musaran2]

Explanations are too convoluted and repetitive. Would be better to explain the base functions and slight switching between many modes.