191–200 of 273 posts
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They mean a heat pump. You apply work to transfer heat, getting more inside than if you had just turned the energy into heat directly; the outside gets colder of course. https://en.wikipedia.org/wiki/Heat_pump#Principle_of_operati...
Yes, heat pumps are over 100%, but isn't turning the energy into heat directly exactly 100%?
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Yes, heat pumps are over 100%, but isn't turning the energy into heat directly exactly 100%?
As a random thought, for resistive heating some energy is definitely "lost" as light.
This one is pretty cool and definitely surprised me. > Motor Humming or Whirring when Navigating to a Supercharger … > In some circumstances (such as cold weather), it is normal for the motor(s) and components to make noise, such as humming or whirring as it generates heat to warm the Battery. Super cool that the motors can be used for things other than moving the vehicle. It reminds me of how ESCs for RC vehicles us…
I have a relatively analogue car (Subaru BRZ) and there are times when you shut it off on a warm day and then randomly about ten mins later a radiator fan kicks on. I guess it's to help cool down but I don't remember exactly what the manual says. Basically it's cool how cars do things largely on their own sometimes to stay within certain parameters.
Before I looked up what it was, I kept hearing a gentle noise coming from the garage in the late evening. Figured it was noise from outside... Then one day I was out there and heard it start, realized it was the car, and looked it up.
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Sound design is an important part for many other manufacturers. There are literally people who's job it is to make sure that things like the "thump" of a closing door sounds good and on-brand. Though to be fair it's kind of an outgrowth of legacy car manufacturers who need to sell tiny bits of progress to stay relevant.
You mean when you physically close a car door they might shape the internal sound dynamics in either the frame or inside the door or adding some surface layer to the door itself?
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This is due to a phenomenon called heat soak which is where the engine temperature increases above normal for a time after it has been switched off due to the lack of coolant flow. The fan is coming on to aid cooling the engine/engine bay to reduce the effect of heat soak. With carburettor fed engines it is sometimes advised by the manufacturer to allow the engine to idle for some time after running it at high RPM. T…
Also turbo charged engines can greatly benefit from running idle for a minute. I learned the hard way. (Had to replace the turbo.)
This one is pretty cool and definitely surprised me. > Motor Humming or Whirring when Navigating to a Supercharger … > In some circumstances (such as cold weather), it is normal for the motor(s) and components to make noise, such as humming or whirring as it generates heat to warm the Battery. Super cool that the motors can be used for things other than moving the vehicle. It reminds me of how ESCs for RC vehicles us…
Back when I watched more F1 racing they had a musical performance where they used the telematic systems of some cars, with their high revving motors, to play notes ie the telematics selectively. I couldn't readily find a reference but remember the event.
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How can anything be <100% if producing heat is the goal? Where would the rest of the energy be going?
Using a cryptominer or GP computer at full tilt for the purpose of making heat is less than 100% efficient, because some of the input power gets used on computing. A pure resistive heater is also less than 100% efficient, but it's very very close.
> Cabin Noise during Acceleration with Ludicrous Enabled This one is pretty good.
I don't get it. OK there are sounds to let you know the car is falling apart constantly, but this one is ambient sound of people encouraging you to accelerate??