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Nairaland Forum / Nairaland / General / Car Talk / Does A Car Consume More Fuel When The AC Is On HI Than On LO (35664 Views)
My Toyota Corolla Over Heats Only When The AC Is On! / Reasons Why Your Car Consume Much Fuel / 6 Reasons Your Car Consumes More Fuel Than Normal (2) (3) (4)
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by cardoctor(m): 10:13am On Apr 11, 2016 |
Simple answer is NOT REALLY. As long as your AC is on and the compressor clutch is engaged, the car engine is working on more load which equates to more fuel requirements by the engine to keep the power balanced. Fan speed on high or low doesn't really bear much significance to fuel consumption. Too many off the rail contributions here. I'm out. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Osyxcel(m): 10:37am On Apr 11, 2016 |
MyX1: You can confirm yourself. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by suco01(m): 11:02am On Apr 11, 2016 |
Frm a car AC technician dat i asked, he told me d more u change d car AC frm low to medium to high and d engine change sounds, it consume more fuels dats y u see pple mostly stay on low to maintain a cool environment in d car to avoid more fuel consumption... 1 Like |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Lagusta(m): 11:07am On Apr 11, 2016 |
NigerianScholar: Which village did you come from 4 Likes 1 Share |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by 1886martino(m): 11:31am On Apr 11, 2016 |
suco01:Engr how is it possible? Fuel hose inside... blah blah |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by 1886martino(m): 11:35am On Apr 11, 2016 |
I read some comments and laugh. Some people should go and learn how car engine works before talking about A/C system. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Oshotse21(m): 11:36am On Apr 11, 2016 |
Engine boys wan blow my head o...lay man explanation pls |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Nobody: 11:45am On Apr 11, 2016 |
Sunymoore: If you mean to ask if higher fan speed with the AC will reduce your MPG, it certainly will! The AC in your car (aside from electric AC systems found in hybrid and electric cars) works differently from the electric systems in buildings and houses. Automotive AC systems use a compressor driven by the engine through an electromagnetic clutch. This allows the compressor to be disengaged when not in use. When you use the AC, the air is cooled by passing over the evaporator which is cooled by the work done by the compressor. The evaporator gets cooled to about 34°F but not much lower to prevent ice accumulating. When the evaporator reaches that temperature, the compressor is disconnected by the clutch. As air continues to flow over the evaporator, the evaporator takes the heat from the air and its temperature increases. When the evaporator reaches about 42°, the compressor clutch is engaged and the evaporator is cooled back to 34°. Increasing the airflow over the evaporator causes it cool down more slowly with the compressor engaged and heat up more quickly with the compressor disengaged. This results in the compressor running for more time, which takes more power from the engine and results in fewer MPG than when the airflow over the evaporator is lower. It takes work to cool air. The work is ultimately done by the engine. More work is required to cool more air. Electric AC systems are governed by the same rules. https://www.quora.com/Does-the-increase-in-fan-speed-of-a-cars-AC-decrease-its-fuel-efficiency-Why-or-why-not This means more fuel is used, not because the fan is using engine power to turn faster, but because the compressor ends up being engaged for longer and disengaged for far shorter periods during the use of the AC at higher fan speeds. 2 Likes |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by seaga: 11:46am On Apr 11, 2016 |
FTBoi: Check owners manufacturers manual, for more details.The funny thing people who has never used or driven a large number of cars would argue with someone that rebuild and reconstruct cars. Note blower has no connection whatsoever with the engine it's only fuse box and the compressor hoist that's connected. The jerk is either your compressor is having problems with the control switch or your minds playing tricks on you |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by ogbiwa: 12:01pm On Apr 11, 2016 |
achu442: what if cold begin catch me for road when the A/C dey for HI. Make I freeze for steering because of your experiment? na joke o 1 Like |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Bollinger(m): 12:49pm On Apr 11, 2016 |
honmusa: That is wrong. Your use of AC does not impact the gas consumption especially when you are on a highway. Not using your AC will consume more gas than when you do. Opening your windows transforms your car into a parachute, which means the vehicle is dragging air. What impacts your fuel consumption is the size of your engine and not inflating your tires to the manufacturers recommended levels. 1 Like |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by gabicon: 12:52pm On Apr 11, 2016 |
ogbiwa: http://auto.howstuffworks.com/fuel-efficiency/hybrid-technology/driving-with-windows-down1.htm |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by whoawa(m): 1:37pm On Apr 11, 2016 |
The higher the increment on the speed, the more energy (fuel) required. When ever u increase the speed of any rotor, the FREQUENCY will automatically increase. And frequency in engineering is define as number of revolution or cycles per second. In a summary the work done to revolve the rotor in a higher frequency will result in more fuel consumption |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Shikena(m): 2:34pm On Apr 11, 2016 |
suco01:Don't know how you did the hose to jerry can thing but please don't ever try that again jeez! |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by philosopy: 3:08pm On Apr 11, 2016 |
"On high" mean the compressor now runs for longer time, meaning a slight increase in the car rev to keep up with the sudden drag or load caused by the running compressor. Over a period of time, yes, it consumes more fuel. but it might be insinificant over a short period. The perfect scenario is to watch ur deep freezer run and stop. Notice how the power flunctuates as it picks up . For a car, it draws power from the engine, remember the second law of thermodynamics, work is done on the system and for a prolonged period of time, it becomes tangible work which consumes an aggregate amount of fuel. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by suco01(m): 3:42pm On Apr 11, 2016 |
Shikena: Wetin b d big deal since weyb say na d technician do am. He comot d hose wey carry fuel enta caprator, den use anoda hose frm d can to connect to d caprator. Abi na magis to u?. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by suco01(m): 3:44pm On Apr 11, 2016 |
1886martino: Ogbeni i am nt the technician, d technician did it and i witnessed it, even b4 dis thread comes to nairaland dat it has been practicalised and av seen it.. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Emeka71(m): 5:14pm On Apr 11, 2016 |
martineverest:This period of fuel crisis is not the time to be using air -condition in cars. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by kuntash: 6:08am On Apr 12, 2016 |
martineverest: When there is a +ve change in temperature @ the evaporator ... it CONDENSES ..... that's the cause of water that drips below your car ! Examples of condense in a sentence in this regard. The cooler temperatures cause the gas to condense into a liquid. Moisture in the air condenses to form tiny drops of water. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by Mboeky: 6:33am On Apr 12, 2016 |
No, it's the same principle as if you use a shower that is slightly hot or very hot, the energy consumption and charges would be the same. |
Re: Does A Car Consume More Fuel When The AC Is On HI Than On LO by bigwizzy001(m): 2:02am On Jun 12, 2018 |
[color=#770077][/color] I must confess this is quite insightful. May God bless you beyond explanation.
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