Posted by bwilson4web on May 14, 2011, 7:23 pm
Whatever it takes to get you to change you profile and keep your
postings around. LOL!
You are such an easy bitch.
Posted by Elmo P. Shagnasty on May 14, 2011, 7:42 pm
What's that I said, Bob?
"my profile"? WTF are you talking about?
Posted by bwilson4web on May 14, 2011, 9:44 pm
. . .
No problem, I understand how easily you are confused.
We were posting about the superior Prius air conditioner compressor in
the NHW20 and ZVW30 Prius. Unlike traditional gassers, the Prius do
not use a power robbing belt feeding an electric clutch and turning a
shaft through a seal in the compressor housing. A seal that is subject
to mechanical wear and failure. Instead, the Prius compressors are
electrically driven which pays great efficiency and reliability
The absence of a seal around a spinning shaft elminiates a leak path
for refrrigerant. A path that is subject to mechanical wear. It also
eliminate the electric clutch, another source of air conditioner
failures. Best of all, it is not engine driven so the compressor
continues to run off of the traction battery instead of running the
engine wasting fuel like a gasser or diesel.
See how much easier it is when you ask nicely,
Posted by Elmo P. Shagnasty on May 15, 2011, 12:33 am
Are you saying the Prius does not source its power entirely from
gasoline? Is that what you mean by "gasser"?
What source of energy does the Prius use, then?
And you said "the Prius A/C compressor doesn't have any seals". That's
way, WAY different than the truth.
Makes one wonder about your pretty charts and graphs.
Posted by bwilson4web on May 15, 2011, 6:57 am
Thanks for asking as there are several sources that show the superior
advantages of the Prius electric compressor. The paper
SAE-2004-01-0064 discusses the efficiency in table 4, pp. 10:
11.2 km/L - 1.5L Corolla, gasser with traditional belt-clutch
18.6 km/L - 1.5L NHW11, Prius with traditional belt-clutch compressor
22.1 km/L - 1.5L NHW20, Prius with electric compressor, twice the
mileage of the Corolla
(You can get a copy from the SAE at: www.sae.org.)
Another excellent source is the EPA rule making document:
". . . However,
several commenters noted that electric A/C compressors are an enabler
to lower leakage
rates beyond the minimum levels we specified - and when this
technology is used in
conjunction with other leakage-reducing technologies, the resulting
system leakage can
be lower than the minimum levels we proposed (8.3 g/yr for cars and
10.4 g/yr for
trucks). We agree with the commenters that it is feasible for A/C
systems with electric
compressors to achieve lower leak rates than belt-driven compressors.
leakage can be responsible for more than 50% of the refrigerant
leakage from a system,
we are lowering the minimum leakage score for cars and trucks with
by 50%, to 4.1 and 5.2 g/yr respectively. The effect of this change
will be that vehicles
with electric compressors will be able to qualify for credit, on a
than would have been possible with the limitations of the original
score. For vehicles which do use an electric compressor, the 8.3 and
10.4 g/yr minimum
leakage scores for cars and trucks are retained." pp 70-71. EPA-420-
R-10-009, April 2010,
"Final Rulemaking to Establish Light-Duty
Vehicle Greenhouse Gas Emission
Standards and Corporate Average Fuel
So as I pointed out before, the Prius electric air conditioner
compressor is clearly superior to the traditional, gasser and diesel
versions that used pulleys, belts, electric clutches, shafts and a
leaky seal. Completely sealed, they don't have this leak path which
the EPA has also recognized. Clearly, it also improved Prius
performance that again is so much improved over inefficient gassers
Thanks for asking!