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Thread: a question about car ACs

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    Default a question about car ACs

    in English:
    I want to know generally about all cars and specifically about Cuore that when we move the fan speed selector to medium and fast from slow, does it only speeds up the blow or is the AC working also sped up with this (and eventualyl more load on engine)?

    in Roman Urdu:
    mera sawal sab cars k ACs se related he or Cuore k baray main bilkhasoos hai. us main jb AC start karte hain to kya fan speed change karne se sirf blor k fan ki speed taiz hoti he ya AC bhi zyada cooling karna shuru kar deta he (and eventualyl more load on engine) ?

    SOLUTION


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    The compressor speed depends on the engine speed. The blower speed is set separately.

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    I am asking about the switch in the attached picture. (Slow/Medium/Fast). Does it only control the blower speed?

    a question about car ACs -1579655

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    Default

    Quote Originally Posted by nabeelkhan View Post
    I am asking about the switch in the attached picture. (Slow/Medium/Fast). Does it only control the blower speed?

    a question about car ACs -1579655
    It control only the speed of the air blower nothing else.

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    does AC work on constant speed ?

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    The part that actually performs the AC function is the compressor. The compressor works at a constant speed and only takes away the heat from air. When you turn the knob on the AC panel, you are only changing the flow rate of the cool air. The AC/Compresssor works at a constant speed.
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    Default

    Quote Originally Posted by shaiki View Post
    The part that actually performs the AC function is the compressor. The compressor works at a constant speed and only takes away the heat from air. When you turn the knob on the AC panel, you are only changing the flow rate of the cool air. The AC/Compresssor works at a constant speed.
    Engine driven ac compressor work with engine rpm, the electrical ac compressor as in Prius work at a cabin temperature regulated speed independently.
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    It depends on the system design. There can be a separate thermostat knob/slider switch. In modern cars the thermostat is also controlled along with the blower fan speed. I think in coure the selector switch you mentioned controls only the blower speed and the knob to its right has a mild option for economical ac which means ac will trip at a warmer temperature.
    And the compressor speed is directly proportional to the engine rpm as it is connected through a belt. Thats why at stopovers the ac performance degrades in smaller cars specially.

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    Default

    Quote Originally Posted by shaiki View Post
    The part that actually performs the AC function is the compressor. The compressor works at a constant speed and only takes away the heat from air. When you turn the knob on the AC panel, you are only changing the flow rate of the cool air. The AC/Compresssor works at a constant speed.
    huh?

    so decompression of the refrigerant aka boilover that happens in the evaporator is not the cooling function? or the condenser is not the item that removes heat?
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    Quote Originally Posted by Xulfiqar View Post
    huh?

    so decompression of the refrigerant aka boilover that happens in the evaporator is not the cooling function? or the condenser is not the item that removes heat?
    I was explaining the overall function of the air conditioning system not the whole air conditioning cycle.
    Yeah the refrigeratant absorbs the heat, vaporizes and then cools upon expanding through the capillary tubes. There is a whole work of thermodynamics behind it which I believed the poster wasn't interested in.
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    The fan speed control switch only controls the speed of the fan while the compressor's speed varies with the rpm of the engine and is not variable through some controller. However, the fan speed does alter the rate at which the compressor turns on and off, frequently turning on and off at low speed while staying on for longer at high speed. This happens because of the thermostat installed in the evaporator unit. At low speed, the coolness of the ac stays longer within the unit, making the thermostat think that it has reached the cut off temperature while at higher speed, it takes longer for the unit itself to reach the cut off temperature because the coolness is transferred to the cabin.

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    Quote Originally Posted by Owais_Yunus View Post
    The fan speed control switch only controls the speed of the fan while the compressor's speed varies with the rpm of the engine and is not variable through some controller. However, the fan speed does alter the rate at which the compressor turns on and off, frequently turning on and off at low speed while staying on for longer at high speed. This happens because of the thermostat installed in the evaporator unit. At low speed, the coolness of the ac stays longer within the unit, making the thermostat think that it has reached the cut off temperature while at higher speed, it takes longer for the unit itself to reach the cut off temperature because the coolness is transferred to the cabin.
    Now that's what I was going to type... You save me from typing few words

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    don't worry much about the blower switch, just set it at 4th place or 80% to save your self from cabin noise.

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    does that mean when car is running at high speed, the AC compressor works more and when the car is standing still but engine is on then the AC compressor works less ?

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    Quote Originally Posted by Owais_Yunus View Post
    The fan speed control switch only controls the speed of the fan while the compressor's speed varies with the rpm of the engine and is not variable through some controller. However, the fan speed does alter the rate at which the compressor turns on and off, frequently turning on and off at low speed while staying on for longer at high speed. This happens because of the thermostat installed in the evaporator unit. At low speed, the coolness of the ac stays longer within the unit, making the thermostat think that it has reached the cut off temperature while at higher speed, it takes longer for the unit itself to reach the cut off temperature because the coolness is transferred to the cabin.
    bhai ye samajh nahi aya mujhe. when you mentioned 'speed' several times is it car speed or fan speed? zara explain karo.

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    Speed of blower. It decides the tripping of the AC.

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    Quote Originally Posted by nasirjavaid View Post
    Speed of blower. It decides the tripping of the AC.
    How it does that?

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    Quote Originally Posted by nabeelkhan View Post
    How it does that?
    Same as your refrigerator does when at low or high settings.

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    bhai mere blower ki speed ka AC compressor tripping se kya talluq

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    Bhai ha na talluq

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