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Dutchess_III's avatar

Does it change the temperature of the air?

Asked by Dutchess_III (46255points) June 4th, 2021
13 responses
“Great Question” (1points)

When you turn the thermostat from 70⁰ to 60⁰ does it change the temperature of the air coming out of the vents or does it simply adjust how long the air blows?

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Tropical_Willie's avatar

The thermostat turned down . . .“simply adjust how long the air blows” yup that is it.

The output “air” temp will be the same from the vents..

kneesox's avatar

Do you have it set for heat or air conditioning?

stanleybmanly's avatar

The thermostat is but a thermometer attached to an on and off switch. Both the heater and air conditioner are usually designed to heat or cool the air at a steady rate. Just as the room itself requires time to heat or cool to the desired temperature, the same holds true for the system heating or removing the heat from that air. Often, there is a fan in these systems which moves the air, and these can adjust the rate at which the air is moved from the heat or cooling source through the vent. Often the fans are designed to delay kicking in until the heater or air conditioner itself has reached its ideal operating rate. Are you asking about the system in your trailer or home?

kritiper's avatar

Once the room temp comes down to 60, the A/C will come on more often to keep the room at that temp. (Compared to how often it will come on at 70.) But the temperature of the air coming out of the vents is the same.

stanleybmanly's avatar

So the air conditioner is guaranteed to have a fan and probably 2. There will be a fan to pull the air either from the room or outside. The fan draws the air over the cold coils where the heat from the air is taken up by the cold refrigerant circulating within the coils (the evaporator) and the fan propels the cooled air into the room. The fluid then passes through a compressor which effectively keeps the fluid flowing with the now concentrated fluid leaving the compressor heating up the exiting set of coils (the condenser) which is exactly as the radiator on your car. And just as with your car, there is usually a fan passing air over the coils and exhausting the hot air to the outside transferring the heat from the coils to outdoors. Imagine that the entire system is just one very long pipe with a pump. Only one section of the pipe (the evaporator) has a much greater diameter than that of the other (the condenser). When the fluid passes from the tiny pipe to the much greater volume, you get a vacuum and the temperature of the fluid plunges as it “evaporates” in the vacuum. All in all, the correct way to look at refrigeration rather than cooling is the removal of heat.

stanleybmanly's avatar

I neglected to include the really narrow “capillary” tube section of pipe between the condenser and the evaporator. The drop in pressure is enormous with the huge expansion in volume resulting in frigid temperature for the resulting vapor. blah blah.

JLoon's avatar

I’m not qualified to answer this question – So I will.

Yes. It does.

And when that happens it will change your life. But I’ll always think of you as hot. And a little sweatty.

Be strong and stay cool.

kritiper's avatar

Another important aspect of air conditioning is that it dries the air, speeding up evaportation of sweat, which makes you cooler.
In addition to what @stanleybmanly said, there are two separate sides of a A/C system: The high pressure (hot) side and the low pressure (cold) side. The high side is ½ of the compressor through the condenser, then the receiver/drier, up to the TEV (thermostatic expansion valve). The pressure goes from high to low at this valve causing the refrigerant to get very cold and begin taking on BTUs. Then the refrigerant goes through the evaporator which cools and dries the air. Then the refrigerant goes back to the compressor and the process begins again.
Have you ever witnessed water dripping under your car in the summer? That is your sweat that the A/C removed from you and the inside of your car.

seawulf575's avatar

When your Air Conditioning is running, it is taking room air and blowing it over cooling coils. This removes heat from the air. The return air will be cooler than the room air. Once the desired temperature is reached (per the thermostat), the AC will “cycle” to control at that temp. this generally includes adjusting air flow.

kneesox's avatar

Wow, @Dutchess_III, you just tapped into a bunch of expertise. Who knew we had so many knowledgeable people on HVAC? I’m proud of us.

Dutchess_III's avatar

I knew! I’ve been hanging with these guys for over 10 years.

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