Electric AC Compressor in Dixie

May 13, 2011 71 Replies

We had one of those close mornings when the humidity is nearly 100% but too warm for fog. Driving my wife's 2010 Prius, I closed the vents and windows and used the air conditioner to take out the damp but I had to stop at a busy intersection. As I came to a stop, the engine shutoff yet the AC remained cool because the compressor is not engine driven.



Unlike engine driven compressors, there are no seals, electric clutches, or belts. Instead of designing for the wide range of engine speeds, 800-6,000 rpm, the Prius electric compressor is optimized and draws on the same technology as refrigerators and home air conditioners which have become exceptionally efficient. By eliminating parts and seals, the Prius compressor sets a high bar improving reliability and efficiency. So the light changed and everyone moved out yet the Prius engine was not burdened by electric compressor load as the traction battery provided power.



In contrast, today's gassers and diesels have belts, electric clutches, and seals for their mechanically driven compressors. This robs power directly from the engine and limits where the compressor can be located leading to a cluttered engine compartment. In contrast, the Prius regenerative braking stored the power that ran the air conditioner compressor and fan when the car slowed and stopped with the engine off. But the Prius extends the options back into the house.



I saw a nice room air conditioner at Home Depot, 850W for 7,000 BTU, well within the range of my 1kW inverter. I still have to test the unit but it looks to be substantially more efficient than our 5,000 BTU window AC and perfect for Prius power during an outage. So we'll be cooler and save electric bills this summer.



Compared to gassers and diesels, the Prius air conditioning is exceptionally efficient and reliable. Unlike gassers and diesels, Prius integration with the house extends efficiency and saving other household bills. Once again, the Prius is going where gassers and diesels can not follow.



Bob Wilson


No seals? Really?

Is that like "the Prius is superior because it has a catalytic converter, which means it doesn't produce carbon monoxide"?

No shafts, no seals, no electric clutches. See Ebay item:

110674772862

Bob Wilson

My wife's Prius compressor looks like this Ebay item: 140444294007

Toyota has been putting in electric AC compressors for both the NHW20,

2004-09, and ZVW30. They are exceptionally efficient and run even when the engine is off. Again, something the gassers and diesels do not do.

Bob Wilson

Hey, look everyone--techno-ignorant Bob strikes again, then again pointedly ignores the actual questions when he's called out on his ignorance.

Tell us again how the Prius A/C compressor has no seals. We LOVE a good sea story.

The more you talk, the more your complete and utter ignorance shows.

As is is obvious in the photos, no shaft, no pulley, no electric clutch, and no seals. The Prius electric compressor is another superior aspect over what we find in gassers and diesels. Here is another photo taken at the Detroit Auto Show in January, 2009:

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The air conditioner compressor is the lower unit and above it is the electric water pump. The engine has no belt sucking power directly from the engine.

The electric water pump is also a completely sealed unit so there is no path for coolant to leak out. Best of all, it uses less power than a traditional engine water pump. Less energy wasted pumping coolant is more that is available to drive the Prius.

Now there are after-market, electric water pumps for gassers and diesels but no one has identified a make and model that comes with an electric water pump.

Bob Wilson

Bob Wilson

And the bicker fest just keeps on keeping on I see....

He meant no double lip or other type mechanical shaft seal, I hope, of course it still has the gaskets and O-rings which are... gasp... seals.

Wait a minute--are you saying that Bob would TWIST THE FACTS and say things that aren't true, to try to make people think the world isn't what the world actually is?

Within one week's time, we hear Bob tell us:

  • "the Prius is superior because it has a catalytic converter, which means it doesn't produce carbon monoxide"
  • "the Prius is superior because its air conditioning compressor has no seals"

One has to imagine this is how Bob goes through his life, spouting things are simply aren't true--we call that "lying"--in order to convince people that things are different than they actually are. For some reason, that pleases Bob.

It sounds like Bob needs to lie to the world in order to feel good about his automotive purchases. That he needs the world to validate his automotive purchases, is his problem. That he out and out lies, is important for the world to know.

no, you were quite clear: "it has no seals". That's pretty definite for a man who spends his life measuring the performance of his Prius driving down his neighborhood street.

You also said "it doesn't produce CO", which is another definitive statement.

You have a habit of making clearly definitive statements out of ignorance, but then when called on them you backtrack with "well, you know what I meant". No, Bob, we don't know what you meant. You made clear and definitive statements, and you showed your ignorance.

And your backtracking reveals even more about who you are--or rather, aren't.

you seem to be saying, quite clearly and definitively, that the A/C coolant mixes with the engine coolant.

"There isn't a separate set of condensor coils" means exactly what, Bob?

So the Prius A/C compressor has no seals? At all.

Riiiiiight.

You keep calling non-Prius cars "gassers". What does that mean, exactly?

You DO realize, don't you, that the Prius uses gasoline as its sole source of energy?

The Prius is a "gasser" every bit as much as any other "gasser" you try to call names on.

On May 13, 5:53 am, bwilson4web wrote: . . .

One of the interesting aspects is how few Prius air conditioner failures occurred after the electric compressor was introduced in

2004. I have seen at least one ordinary air conditioner failure with the NHW11 that still uses the pulley, belt, electric clutch compressor.

Bob Wilson

On May 14, 12:57 am, "Daniel who wants to know" wrote: . . .

Actually, we're going to step it up. Our local troll has set his configuration so his original postings are deleted after a week or so. The only way he exists is when 'quoted.'

Bob Wilson

Sorry Elmo, I have no interest in your fantasies. Perhaps you might have more luck at one of the alt.sex sites.

Bob Wilson

Look Elmo, I don't know anyone who cares about your sexual fantasies. Just head over to the alt. groups where you'll receive the attention you deserve.

Bob Wilson

No Elmo, you are not attractive to anyone. Serious, head over to the Alt. sex sites.

Bob Wilson

No answer to that one, Bob?

Ah, your answer is that you fantasize about sexual relations with other men.

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