AT's latest video card testing results

[Janooo]

efficiency at what? converting gasoline into CO2 + H2O + NOx?



yes. unless you did not return to the same elevation from which you began your journey, in that case some of the energy was temporarily converted into potential energy care of gravity...or you stopped your journey at a lower elevation than you began and so not only did you convert 100% of the gasoline's energy into heat but you also converted some potential energy from gravity into heat as well.

if your 100km journey was a closed-path, end-point is the same as the start-point, then yes 100% of the gasoline's energy was converted to heat by the time your trip came to an end.

http://www.school-for-champions.com/science/thermodynamics.htm

Why these engines are considered to have 20% efficiency?

 

[Idontcare]

They convert 20% of the electrical energy into mechanical energy (work). I said that way above when you first posted the link.

That mechanical energy in turn becomes heat. That is what happens to kinetic energy, that is what one means when one refers to "drag"...drag is the process by which mechanical energy becomes heats.

 

[RussianSensation]

I am an absolutely junior member here, but what about this suggestion.

Let everyone buy what THEY think is the best card for the price.

You are absolutely correct. What happens is someone asks what the best computer part is at a certain price. So then different people recommend different components based on criteria such as absolute performance, price/performance ratio, performance/watt ratio, absolute power consumption, idle vs. load power consumption, minimum frame rates, etc.

We should pay more attention to what the original poster ranks as most important and then cater our recommendations appropriately

Good advice maddie!

 

[Janooo]

They convert 20% of the electrical energy into mechanical energy (work). I said that way above when you first posted the link.

That mechanical energy in turn becomes heat. That is what happens to kinetic energy, that is what one means when one refers to "drag"...drag is the process by which mechanical energy becomes heats.

20% of the internal energy on the input is transferred into useful work, 80% are losses.
Where do you see that anybody claimed that a combustion engine turns everything into the heat?
Please, show me one source.

 

[Keysplayr]

20% of the internal energy on the input is transferred into useful work, 80% are losses.
Where do you see that anybody claimed that a combustion engine turns everything into the heat?
Please, show me one source.

This is like you saying that only 20% of that gasoline produces heat when it combusts, and the part that pushes down the piston remains cold.
All of the gasoline burns, all of it becomes heat as it's transferred to the engine block and coolant, and mostly exhausted.
The piston being forced downward is that result of the energy. Does not diminish the consumption whatsoever. Just like the annihilated peaches are a result of the mixers power consumption. All of it.

 

[Janooo]

This is like you saying that only 20% of that gasoline produces heat when it combusts, and the part that pushes down the cylinder remains cold.
All of the gasoline burns, all of it becomes heat as it's transferred to the engine block and coolant, and mostly exhausted.

No, I am saying that part of the gasoline internal energy produces kinetic energy and not the heat energy.

 

[Keysplayr]

No, I am saying that part of the gasoline internal energy produces kinetic energy and not the heat energy.

I understand that, but it's not part of the gasolines internal energy. It's all of it.
The kinetic energy (piston forced down) is just a result of 100% of the gasoline burning producing all the heat that the actual amount of gasoline is supposed to produce. Whether you pour that same amount of gas on the ground as being injected into the cylinder, and light it up, it still produces the same amount of heat. Albeit a lot slower. But it's the same amount of heat produced for the specified (whatever the measurement would be) amount of gasoline.

Take the fan blade off the fan motor. Still going to consume the same power and produce the same heat.

 

[cusideabelincoln]

No, I am saying that part of the gasoline internal energy produces kinetic energy and not the heat energy.

No one is denying that. What we're saying is that kinetic energy eventually winds up as heat energy, if you expand the system to include everything.

The friction of the internal components of the engine cause lots of heat from kinetic energy, so that kinetic energy is turned into heat. The kinetic energy that moves the car causes air friction, which means heat energy is transferred to the air. The friction of the tires on the road from the work of the kinetic energy causes the tires and road to heat up (heat energy).

 

[Keysplayr]

No one is denying that. What we're saying is that kinetic energy eventually winds up as heat energy, if you expand the system to include everything.

The friction of the internal components of the engine cause lots of heat from kinetic energy, so that kinetic energy is turned into heat. The kinetic energy that moves the car causes air friction, which means heat energy is transferred to the air. The friction of the tires on the road from the work of the kinetic energy causes the tires and road to heat up (heat energy).

Very well said. ^

 

[Janooo]

I understand that, but it's not part of the gasolines internal energy. It's all of it.
The kinetic energy (piston forced down) is just a result of 100% of the gasoline burning producing all the heat that the actual amount of gasoline is supposed to produce. Whether you pour that same amount of gas on the ground as being injected into the cylinder, and light it up, it still produces the same amount of heat. Albeit a lot slower. But it's the same amount of heat produced for the specified (whatever the measurement would be) amount of gasoline.

Take the fan blade off the fan motor. Still going to consume the same power and produce the same heat.

What happens to the heat and temperature when the piston is pushed down?

 

[Janooo]

No one is denying that. What we're saying is that kinetic energy eventually winds up as heat energy, if you expand the system to include everything.

The friction of the internal components of the engine cause lots of heat from kinetic energy, so that kinetic energy is turned into heat. The kinetic energy that moves the car causes air friction, which means heat energy is transferred to the air. The friction of the tires on the road from the work of the kinetic energy causes the tires and road to heat up (heat energy).

When you move a car 100km how much work was done?

 

[dust]

When you move a car 100km how much work was done?

While I'm sure it's an interesting topic, it should be discussed elsewhere, I just logged in and was hoping to learn something else from this particular thread. Not directed only at you!

 

[Keysplayr]

While I'm sure it's an interesting topic, it should be discussed elsewhere, I just logged in and was hoping to learn something else from this particular thread. Not directed only at you!

Definitely have a point there. I really don't know how we got this far off topic. Maybe an equivalent thread can be started up in the "highly technical" forum.
Interesting discussion none the less.