AC setting for Fuel Efficiency?

[cocacola]

වාහන තියෙන කස්ටිය හොදටම දන්නවනේ AC නැතුව ගියොත් අනිවා Interior එක ගන්න දෙයක් නැති වෙනවා කියලා. dust එක ඇවිල්ල ඇවිල්ල අනිවා සවුත්තු වෙනවනේ.

හැබැයි AC එක දාල දුවද්දී තෙල් පිච්චේනවත් වැඩිනේ. දැන් මගේ ප්‍රශ්නය මේකයි.

AC එකට බලපාන settings දෙකක්නේ තියෙන්නේ. එකක් temperature knob එකයි අනික fan speed knob එකයිනේ.
දැන් තෙල් පිච්චිල්ල අඩු වෙන්නේ මේ knob කොහොම කරකුවොත්ද?

temperature knob එක දකුණටම කරකවල ඒ කියන්නේ high cool දාල fan speed එක 1 කේ තිබ්බොත්ද අඩුවෙන්ම තෙල් පිච්ච්න්නේ
නැත්නම් temperature knob එක වමට කරකවල ඒ කියන්නේ low cool දාල fan speed එක 1 කේ තිබ්බොත්ද අඩුවෙන්ම තෙල් පිච්ච්න්නේ?




engine එකට load එක එන්නේ temperature knob එකෙන් නේද? නැතුව fan speed knob ඒකෙ speed එක වැඩිම එකට දැම්ම කියල case වෙනවද?

 

[asylum]

bump.

 

[imhotep]

Theoretically both. If you increase the fan speed, then it takes more current, which in turn loads the alternator thus requiring more engine power - hence more fuel.
When you lower the temperature setting then the compressor works in for a longer time and burns more fuel.

 

[C_A_S_P_E_R]

i need to know too

 

[hichchiputha]

උඩ

 

[Emios]

You should not by a car if you try to save fuel by reducing temperature.the savings are few cents to non

 

[Tanto]

mama use karanne swift 2003

mama TEMP eka uparima cool daala tiyenne Normaly run karaddi FAN speed eka katu 2kata vagee daanawa rasne wadi vageenam katu 3kata daanawa

eeeta vadaa dannawa nam fan Speed sadde vadi nisaaa daanne naa


thel maha lokuwata yanne naaa ithin


thel ichchenawa vadi vageenam tune up ekak karala balapan

 

[imhotep]

You should not by a car if you try to save fuel by reducing temperature.the savings are few cents to non

Correct! Usually it's between 5% to 10% more fuel.

 

[ieannet]

"engine එකට load එක එන්නේ temperature knob එකෙන්"

fan eka power eka salkiya yuthu matamaka naa

samahara gonu inawa AC eka temp eka full adu karala FAN slow dagenna yanna

temp eka normal day nam 26C wage dala thibama athi, godak rasaneyi nam 25 or 24 hondayi, FAN eka normal speed eka thibanam athi, slow damoath niakn aparade cool eka cabin eka cool karanna hulan ene na ne

 

[rot]

Usually AC compressor will run at the same speed no matter what AC setting your are on. It's directly coupled to some engine belt and will engage when you turn the AC on. (both fan and cool).
I think it's different on electric/hybrid cars.


What this temperature control does is it mix hot air from the engine with cold air from AC to adjust the temperature (not exhaust gas of cause).



So I don't think we can control the fuel consumption using AC controls.
However you can just run with the fan on but cooling off, that will save some fuel and will not get any dusty air inside the car as it comes through the cabin filter.


https://www.youtube.com/watch?v=04MlTepEIz4

 

[ieannet]

Usually AC compressor will run at the same speed no matter what AC setting your are on. It's directly coupled to some engine belt and will engage when you turn the AC on. (both fan and cool).
I think it's different on electric/hybrid cars.

What this temperature control does is it mix hot air from the engine with cold air from AC to adjust the temperature (not exhaust gas of cause).

And I don't think the fan consume any considerable amount of power compared to the AC compressor unit.


So I don't think we can control the fuel consumption using AC controls.
However you can just run with the fan on but cooling off, that will save some fuel and will not get any dusty air inside the car as it comes through the cabin filter.

Not valid, there is thermostat on every car, even very old cars does have it

running the AC does reduce gas mileage very very little or not effect to FAN

The temperature you set in the AC will determine the amount of time the compressor will have to run. The compressor will cut in and out depending upon the cabin temperature and various factors. So, when you select a lower temperature, it will lead to the compressor being active for a greater time interval and lead to a higher load on the engine, which will increase Fuel consumption.

basically same does on air conditioner and refrigerator, when you set low temperature then your power usage more than compare to set it higher temperature.

 

[imhotep]

Usually AC compressor will run at the same speed no matter what AC setting your are on. It's directly coupled to some engine belt and will engage when you turn the AC on. (both fan and cool).
I think it's different on electric/hybrid cars.


What this temperature control does is it mix hot air from the engine with cold air from AC to adjust the temperature (not exhaust gas of cause).



So I don't think we can control the fuel consumption using AC controls.
However you can just run with the fan on but cooling off, that will save some fuel and will not get any dusty air inside the car as it comes through the cabin filter.


https://www.youtube.com/watch?v=04MlTepEIz4

Wrong.. The compressor runs full time engaged and the the climate control is done mixing with with the outside air happens in some of the new cars only. Specially the German cars.
In this case there is no effect on the fuel consumption.

 

[Lord Kasun]

You should not by a car if you try to save fuel by reducing temperature.the savings are few cents to non

Henagahana eththa

 

[hrm]

Wrong.. The compressor runs full time engaged and the the climate control is done mixing with with the outside air happens in some of the new cars only. Specially the German cars.
In this case there is no effect on the fuel consumption.

Most newer cars do what you say and normally don't have a clutch to engage/disengage compressor. Even Japanese cars like Vitz, Axio, allion/Premios have this type of compressors known as variable displacement compressors. They run constantly when engine is on and ECU adjusts compressor speed based on various factors. When interior is cooled to desired level compressor runs very slowly just to maintain the cool with less load to the engine. With these cars having AC turned on or off(or having different temps set) doesn't affect fuel economy or acceleration that much.



But cars with regular clutch based compressors it's a different story and compressor doesn't run all the time. Clutch will engage/disengage compressor based on temp sensors against set temperature or cooling level. And compressor always have a fixed speed and load to the engine doesn't change like VDCs do. So when it is run it adds weight to the engine and affect fuel economy to some extent. (Depending on car model, engine displacement etc)

 

[smnadundk]

bmp

 

[Kolama]

You should not by a car if you try to save fuel by reducing temperature.the savings are few cents to non

I would use my brain to earn more money.

 

[Dhanushka.N]

Cool wedi karama compressor on wela tiyena time wadi wenawa fan speed wadi karama ac condensor eke ikmanata cool eka aduwena handa e kiyanne wadipura hulan pramanayak ikmanata cool wenna one nisath compressor eka godak wela on wela tiyenawa.itn dekenm wenne engie ekata load wadi wena eka.itin dekenm fuel usage eka wadi wenawa

 

[Djwathila]

A/C එකට තෙල් පිච්චෙන එක බලපාන්නෙ කොළඹ දුවන කොට තමයි අවුට්ස්ටේෂන් දුවනවනම් ඒ ගැන හිතන්න එපා.

 

[ThimalM™]

You set your AC to meet your thermal comfort. Not according to damm fuel economy.

Better to just operate fans without cooling

 

[imhotep]

Most newer cars do what you say and normally don't have a clutch to engage/disengage compressor. Even Japanese cars like Vitz, Axio, allion/Premios have this type of compressors known as variable displacement compressors. They run constantly when engine is on and ECU adjusts compressor speed based on various factors. When interior is cooled to desired level compressor runs very slowly just to maintain the cool with less load to the engine. With these cars having AC turned on or off(or having different temps set) doesn't affect fuel economy or acceleration that much.

But cars with regular clutch based compressors it's a different story and compressor doesn't run all the time. Clutch will engage/disengage compressor based on temp sensors against set temperature or cooling level. And compressor always have a fixed speed and load to the engine doesn't change like VDCs do. So when it is run it adds weight to the engine and affect fuel economy to some extent. (Depending on car model, engine displacement etc)

Thanks.. I didn't know that the Jap cars like Vitx, Axio etc. The European cars had. You are exactly right.