I was thinking: instead of wasting the excess coolant pressure, why not channel it to spin a compressor and recharge the battery in electrified vehicles? Then you can make the expansion bottle cap sealed to prevent water and air to enter it and also have a longer range, thus better efficiency since less stuff is wasted.
Nice video, i also have a question. As you said cooling system generally runs at 3-4 bars and thats good enough to not boil the liquid up until around 140 degree celcius. My queestion is does the cooling system still run at same pressure even at lower temperatures lets say around 90 degrees celcius? Or does it simply still run at 3-4 bars even at lower temperatures? I also heard higher pressure in the cooling system makes the liquids job of taking away heat from the engine harder , so if it runs at 3-4 bar at even lower temperatures i guess that will decrease efficiency of the cooling system a bit?
Higher temperatures are going to increase the pressure, and low temperatures will inevitably reduce it. Think of pressure pans, they all have bleed valves and it doesn't mean they'll be at that pressure, they may never reach that pressure, it's just for extreme cases.
The primary coolant loop in a pressurized nuclear reactor is over 100 bar to raise the boiling point over 300 °C, and even in the secondary loop it's over 50 bar. They don't seem to have a problem with cooling efficiency, so a few bars in an engine is probably not making a difference.
Wouldn't be it a cone? The cone angle should be adjusted to the required longitudinal and transversal forces (aka g's) . This is from filling point of view. Obviously as a pressure vessel the spherical design is king.
I have enjoyed your videos, but I see lots of information that is incorrect. You give the "typical" diagram but forget the pressure relief valve. It's called a "Radiator Cap" and releases excess pressure as the water expands or boils in the cooling system. As this water exits the cooling loop, it goes into the coolant reservoir at approx. 1 bar. As the engine cools, the coolant flows back into the loops via suction as the coolant contracts. Although your pictures show pressurized bottles, the pic. at .08 sec does not. You mention the best shape is a bottle, but the Tesla design at 1:04 is not round in any way. It's tall with multiple internal dividers to keep bubbles from the bottom. The coolant reservoir does not need to be mounted up high, that is only to ease operator filling. The "pressurized" coolant cap you showed has internal baffling to help ensure the water and air are separated, but not part of a pressurized system. None of the caps have international warnings about pressure relief, but they warn of hot water. Google "audi coolant reservoir cap" and take a look. I also like the Audi at 3:35 with the oil coolant line run on the outside of the frame rails. This will ensure that any damage from another car or roll-over will break the line and cause a DNF. I like the bottle design at 4:09. It has a nice picture of which way to roll your toilet paper.
I think your describing a different style or reservoir. I was wondering why he left it out of the video. Maybe because he’s European and it’s usually found on Asian car designs.
I think they use a closed system, so they are fed coolant until there's no air left and they work with that, no expansion tank would work as they reach around 5-6g in the corners
No. The expansion tank is to catch water overflow on a coolant system if the coolant is hot, then return it when it cools down. Racing cars ALWAYS check coolant levels before going on the track, but anything that goes track must have a coolant overflow can/bottle/device. Different for different classes. I can personally tell you there is nothing like trying to pass an overheating racing vehicle. You are typically going over 100MPH and you get constant blasts of boiling water on your face. It Hurts!!
I don’t see how a spherical shape is better than a cone or an upright cylindrical shape for hard cornering or braking. The sphere has the least friction of any design. The coolant will slosh around in circles.
The sphere has the same distance to the center at any point, ultimately why it works, it doesn't promote different depths depending on lateral g forces, which isn't great on a small tank anyway. Worth keeping in mind the reservoir needs to be high because air is much less dense than the fluid, it also needs to be accessible to both humans and the cooling system so it has to be on the engine bay, which has limited space. A cylinder would work it it was mostly full, which shouldn't happen as described in the video. Could very well be either overestimating your imagination or overestimating how bad sloshing is.
This should be mandatory to watch for anyone promoting the idiocy and fakery of waterless coolants and removing expansion tanks.
Quality as always
the generic vw expansion bottle is a legend
Another Masterclass
Nice little video
How long has VAG been using that same bottle in every car from the cheapest to the most expensive?
for about 30 years. If it ain't broken...
I was thinking: instead of wasting the excess coolant pressure, why not channel it to spin a compressor and recharge the battery in electrified vehicles? Then you can make the expansion bottle cap sealed to prevent water and air to enter it and also have a longer range, thus better efficiency since less stuff is wasted.
This is fundamentally against what expansion bottles for
Very good. Thank you!
I still don't understand why this is any better then an overflow bottle and preasure cap.
Perfect for my mk1 tt 👌
Nice video, i also have a question. As you said cooling system generally runs at 3-4 bars and thats good enough to not boil the liquid up until around 140 degree celcius. My queestion is does the cooling system still run at same pressure even at lower temperatures lets say around 90 degrees celcius? Or does it simply still run at 3-4 bars even at lower temperatures? I also heard higher pressure in the cooling system makes the liquids job of taking away heat from the engine harder , so if it runs at 3-4 bar at even lower temperatures i guess that will decrease efficiency of the cooling system a bit?
Higher temperatures are going to increase the pressure, and low temperatures will inevitably reduce it. Think of pressure pans, they all have bleed valves and it doesn't mean they'll be at that pressure, they may never reach that pressure, it's just for extreme cases.
The primary coolant loop in a pressurized nuclear reactor is over 100 bar to raise the boiling point over 300 °C, and even in the secondary loop it's over 50 bar. They don't seem to have a problem with cooling efficiency, so a few bars in an engine is probably not making a difference.
I disagree on shape, the ideal is an upright cylinder. Its easier to package too.
With a hemispherical bottom
@@carlopitti7500 not necessarily - just make the cylinder tall and narrow.
Wouldn't be it a cone? The cone angle should be adjusted to the required longitudinal and transversal forces (aka g's) . This is from filling point of view. Obviously as a pressure vessel the spherical design is king.
👍
I have enjoyed your videos, but I see lots of information that is incorrect. You give the "typical" diagram but forget the pressure relief valve. It's called a "Radiator Cap" and releases excess pressure as the water expands or boils in the cooling system. As this water exits the cooling loop, it goes into the coolant reservoir at approx. 1 bar. As the engine cools, the coolant flows back into the loops via suction as the coolant contracts. Although your pictures show pressurized bottles, the pic. at .08 sec does not. You mention the best shape is a bottle, but the Tesla design at 1:04 is not round in any way. It's tall with multiple internal dividers to keep bubbles from the bottom. The coolant reservoir does not need to be mounted up high, that is only to ease operator filling. The "pressurized" coolant cap you showed has internal baffling to help ensure the water and air are separated, but not part of a pressurized system. None of the caps have international warnings about pressure relief, but they warn of hot water. Google "audi coolant reservoir cap" and take a look.
I also like the Audi at 3:35 with the oil coolant line run on the outside of the frame rails. This will ensure that any damage from another car or roll-over will break the line and cause a DNF.
I like the bottle design at 4:09. It has a nice picture of which way to roll your toilet paper.
I think your describing a different style or reservoir. I was wondering why he left it out of the video. Maybe because he’s European and it’s usually found on Asian car designs.
Does F1 cars have expansion tank?
I think they use a closed system, so they are fed coolant until there's no air left and they work with that, no expansion tank would work as they reach around 5-6g in the corners
No. The expansion tank is to catch water overflow on a coolant system if the coolant is hot, then return it when it cools down. Racing cars ALWAYS check coolant levels before going on the track, but anything that goes track must have a coolant overflow can/bottle/device. Different for different classes. I can personally tell you there is nothing like trying to pass an overheating racing vehicle. You are typically going over 100MPH and you get constant blasts of boiling water on your face. It Hurts!!
Technically No. They use high pressurized systems for aero advantage. But they do have an accumulator which is to add pressure to the system.
I don’t see how a spherical shape is better than a cone or an upright cylindrical shape for hard cornering or braking. The sphere has the least friction of any design. The coolant will slosh around in circles.
You need to keep those upright, if you have space for it, sloshing shouldn't be a problem because it's a sphere
The sphere has the same distance to the center at any point, ultimately why it works, it doesn't promote different depths depending on lateral g forces, which isn't great on a small tank anyway. Worth keeping in mind the reservoir needs to be high because air is much less dense than the fluid, it also needs to be accessible to both humans and the cooling system so it has to be on the engine bay, which has limited space. A cylinder would work it it was mostly full, which shouldn't happen as described in the video.
Could very well be either overestimating your imagination or overestimating how bad sloshing is.
Amazing how much engineering goes into an ICE car. Fascinating.
Is this what you pee in if you don’t have a blatter?
Bmw never watched this video when they designed the M5x engines