Country of Origin: United States
I am trying to build an electric driven a/c compressor. Any thoughts Thanks Dave
You're going to take an automobile a/c compressor power it with an electric motor? Ok, I'll bite. Why?
"Don't get stuck on stupid!"
---- Lt. Gen. Russel Honore
keep car cool when waiting to pick up wife from work. it get hot here in florida.
You would need a great big alternator to supply the power necessary to run a compressor with an electric motor. The engine would need to be running to turn this alternator to supply the power for the electric motor to turn the compressor. I believe I read somewhere that it takes about 17 HP to drive the A/C compressor when operating. The energy required for A/C is not free.
Just idle the engine while waiting on the wife, problem solved.
Don't hybrids use electric compressors? Just guessing...don't really know. I guess they do have BIG batteries though.
In 2003, DENSO launched the worldÃ¢ÂÂs first small, light-weight electric compressor for hybrid electric vehicles. The electric compressor provides comfortable air conditioning even during Ã¢ÂÂidleÃ¢ÂÂ stops (when the engine shuts down to save fuel and emissions). This maintains cabin comfort while significantly reducing fuel consumption.
Benefits and Features
* Small size and light weight
o By adopting a newly developed motor winding method, DENSO achieves 30 percent size reduction and 53 percent weight reduction of the electric compressor compared to traditional electric compressors, providing more space in the vehicle and further improving fuel consumption.
o High revolution speed (7500 rotations per minute), regardless of the engine speed, reduces the displacement (amount of refrigerant discharged from the compressor per one rotation) to 18 cm3, allowing the compressor to be more compact.
* High efficiency and quiet operation
o The electric compressor combines a scroll compressor and a DC brushless motor. The optimized scroll form and advanced motor control technology improves efficiency and reduces noise and vibration.
* Quick starting
o DENSOÃ¢ÂÂs advanced motor control technology enables the electric compressor to start at a high revolution speed as soon as the air conditioning system is turned on.
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Don't have to build one, just buy one, took a great deal of effort to design a 7,500 rpm compressor operated by a brushless DC motor.
All you need to add is about 100 lithium cells in series and a means to charge them or swipe Ni-cads from a Prius.
I spent a lot of time in Florida, hated AC, buildings were stuffy and played hell with my sinuses, heat wasn't that bad, get use to it. What you don't want to do is to get a job wearing a Mickey Mouse outfit at Disneyworld.
The Prius has high voltage batteries that can run an electric drive without the gas engine running. When the battery power is depleted the gas engine runs not only to move the vehicle, but operates as a generator to recharge the batteries. The high voltage electric motor driven compressor was introduced to provide consistent A/C while operating in either gas or electric drive modes. Funny thing is that the draw of this electric driven compressor is so high that the selection of Max A/C will command the gas engine (generator) to run all the time to keep up with the voltage draw.
It's good for a couple of minutes. Even running the AC with a gasoline engine at idle is the worse thing you can do to your car, takes it's toll on all that plastic and rubber under the hood. Just roll down the windows, and kill the engine, been doing that for a zillion years now, and still alive.
The GM EV had it's range cut over in half by using the AC, think I would rather sit in the shade of that car with the windows down than walk in the hot sun for 80-90 miles. Can also move up to Wisconsin.
True hypermilers think that opening the windows also makes you guzzle gas. They drive in the summer with the windows CLOSED and the A/C off.
With my instant mpg gauge, didn't see any difference with a window down, but does make a huge difference driving up a hill, accelerating from a stop sign, and driving into a strong headwind. Also using that ethanol added fuel crap makes a negative difference, but they all claim it does not. Like up to a 20% difference in fuel economy.
Modern compressors don't use anywhere near 17 HP.
A V7 compressor soaks up 9kW at full output - about 12 horsepower. A 12v, 12hp electric motor will be kind of large...
Even at the impossible 100% effeciency, 9kW @14.5v is 600+ amps to run the electric motor. Just not practical.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
A friend used to own a small airplane with electric air conditioning. The plane was a Commander Aircraft 115. The cabin is quite small, like most single engine aircraft, probably around Toyota Yaris size.
The airplane had two 28V, 100A alternators. Both were needed to run the A/C. The electrical draw increased by around 140A at 28V with the A/C on. The A/C had to be OFF for takeoff. I flew the plane once with the A/C on, it was quite effective.
He now owns a Mooney with electric air conditioning, but I haven't flown that airplane.
Aftermarket electric air conditioners are available for several different airplanes, including the Cessna 182. I believe they cost around $9000 not including installation; at least as of five or so years ago. Perhaps this would be a suitable starting point for the electric compressor search?
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