Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? - Car Talk - Nairaland
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| Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 6:06pm On Jul 23, 2014 |
No cheating, Googlers (self included) yah all placed on notice  Everything being equal (not comparing brick SUV to svelte sedan), which one used more gas/petrol, driving with windows down and not using ac or with windows up and using ac. This is on the open highway where speed is relatively constant. City "Thorn On Their Side" NG |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 6:57pm On Jul 23, 2014 |
Lol... Definitely A.C. Shutting the windows reduces aerodynamic drag on the vehicle, thereby increasing fuel economy. 4 Likes |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Mohitto: 7:14pm On Jul 23, 2014 |
0rex: Lol... Definitely A.C. Shutting the windows reduces aerodynamic drag on the vehicle, thereby increasing fuel economy.cool. then i have been doing the right thing without actually knowing d advantage 3 Likes |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 9:52pm On Jul 23, 2014 |
Switching ON your AC has been discovered to considerably manage fuel economy of vehicle better when compared to opening the windows which creates drags, causes the engine to work more to overcome such drags and air resistance and ultimately lowering fuel economy during highway driving. 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by sultaan(m): 10:00pm On Jul 23, 2014 |
On myth busters it was found to be almost the same 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by yungboss(m): 10:05pm On Jul 23, 2014 |
Easily when the windows are wound up, but again, the refrigeration system exerts its own work on the engine, since it draws power from the engine itself, it is a subsystem of the main motor. so the functions of compression (and expansion) require power (drawn from the engine). then the drag, from this perspective, which is resistance to motion by virtue of the movement of air across the vehicle (with its windows down), is another limiting factor. so given these two circumstances, i am to a limit uncertain as to what the actual answer is to the Op's question. air resistance i know, has this formula Ra=Ka.A.{V.V} Ka= coeff of drag A = frontal area of the vehicle V = speed of the vehicle Op, am i permitted to search through my old text books for some education? 2 Likes |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by missdebs(f): 11:59pm On Jul 23, 2014 |
nd my mum keeps complainin hw ac finishes her fuel....mscheew *blasts ac 2 highest* 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by sultaan(m): 12:07am On Jul 24, 2014 |
yungboss: Easily when the windows are wound up, but again, the refrigeration system exerts its own work on the engine, since it draws power from the engine itself, it is a subsystem of the main motor. OK Trac where have you been 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by yungboss(m): 12:16am On Jul 24, 2014 |
sultaan:lolzz, Trac is from another world! he has not been logging on, I checked his profile...last seen in January. I wonder what has happened 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 7:43am On Jul 24, 2014 |
yungboss: Easily when the windows are wound up, but again, the refrigeration system exerts its own work on the engine, since it draws power from the engine itself, it is a subsystem of the main motor. Damnit, I developed an immediate headache from reading that formula |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by jodeci(m): 7:52am On Jul 24, 2014 |
yungboss: I missed trac anyway,i enjoyed his often head on with Ikenna,to an extent his engineering analysis of automobiles |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by yungboss(m): 9:13am On Jul 24, 2014 |
jodeci:there was also a time Trac v Somorin#1, slick and tyres, I got lost there... 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Marpol: 3:30pm On Jul 24, 2014 |
sultaan: On myth busters it was found to be almost the same The difference was insignificant. |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 3:39pm On Jul 24, 2014 |
yungboss: Oh yeah I remember that episode. |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Raymie(m): 6:59pm On Jul 24, 2014 |
On highway driving, AC. City driving btw traffic stops, window down. For me, AC. Can't stand dust on interior of car. 2 Likes |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by icemann(m): 3:32pm On Jul 25, 2014 |
yungboss: Easily when the windows are wound up, but again, the refrigeration system exerts its own work on the engine, since it draws power from the engine itself, it is a subsystem of the main motor. So you are saying Ra= Ka.A.V2 Even with my knowledge of mechanics I don't understand the formula oh. Please do explain. |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by jodeci(m): 3:54pm On Jul 25, 2014 |
icemann: Even when fun is obvious? |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by icemann(m): 4:02pm On Jul 25, 2014 |
People do get confused on how drag is more when the windows are down. You need to have a creative mind to understand my explanation. The air rushing into your car thorough the windows is pilling your car back Its like a Drogue parachute(chute used to stop jet fighters). That pull is causing the drag on your car. At the bottom of your back windshield there is a tinny gap the helps relive the pressure build up, but is not good enough. Facts you need to know Driving at 60MPH head on at a wind of 10MPH would give you a drag Equivalent of 70MPH ie what you would experience driving at 70MPH on a no wind day. (60-(-10)=70. Read Newtons laws of motion. Wind tunnels are created taking the laws above to model air resistance. They don't have to drive at 150MPH to figure out what would happen. They just force air at 150MPH. The faster you go with your windows down the more unstable your car is. The turbulent flow would fishtail at very high speeds. You know air resistance at high speeds make planes fly. If you are really trying to save gas with no ac, you best bet is to buy a convertible. * I am not here to battle anybody, if you think other wise do state your own claims nicely. Thanks. 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 5:23pm On Jul 25, 2014 |
0rex: Lol... Definitely A.C. Shutting the windows reduces aerodynamic drag on the vehicle, thereby increasing fuel economy. And it's that simple. Kudos for a simple and very easy to read answer. 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by inze(m): 6:20pm On Jul 25, 2014 |
Raymie: On highway driving, AC. City driving btw traffic stops, window down. For me, AC. Can't stand dust on interior of car. @bolded, I thought i was the only one. I don't drive with windows down |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by yungboss(m): 8:53pm On Jul 25, 2014 |
icemann:that's exactly what I am saying, I don't know if this was taught in elementary physics back then...but in thermodynamics, if you recall Bernoulli equation (expressing kinetic energy in the fluid,atmospheric pressure and gravitational effect),consider also the simple definition of force,F as P/A, acknowledge that drag increases with air density, speed and the larger frontal area, a few parameters substituted, and the resultant equation becomes what was stated. I can't fully recall the exact mathematical bits and derivations now, but the equation for air resistance is correct. Maybe I'll work it out and revert... 3 Likes |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Kizyte(m): 11:21pm On Jul 28, 2014 |
missdebs: nd my mum keeps complainin hw ac finishes her fuel....mscheew *blasts ac 2 highest*Don't be misled by some of the informations you find online. I've used my car with and without A/C and it's very obvious my fuel drain faster when running on A/C. 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Nobody: 10:27am On Jul 29, 2014 |
Kizyte:This thread pertains to highway driving specifically. Driving around town with A/C will make your car consume more fuel. 1 Like |
| Re: Quiz: Which Is More Fuel Efficient On The Highway Open Windows Or Ac? by Kizyte(m): 7:01pm On Jul 29, 2014 |
0rex:Now I understand 2 Likes |
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