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Old 01-25-2019, 06:37 AM   #21 (permalink)
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I think my car already has one
https://www.autopartswarehouse.com/v...xpansion-valve

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Old 01-25-2019, 09:07 AM   #22 (permalink)
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Maybe water sprayer over the condenser. I can't really think of anything else to improve the efficiency of the ac system.

change the blower motor resistor to a PWM motor controller (more electrically efficient and also most blower motor resistors sit in the stream of air vents to cool them, effectively warming your air slightly)

Insulation, inside and out.

Wrap the roof in white

Silver one way mirror tints on all windows and large sunstrip on windscreen

Cool the seats with in seat vents (basically cut out channels in seat foam and put fans in)


More expensive options are to then start going for dc compressors and powering it off solar panels on the roof / engine braking etc. The cost of which would be many times more than fuel savings.
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Old 01-25-2019, 10:00 AM   #23 (permalink)
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Yes, European cars tend to have better more efficient A/C systems.
Probably bad something to do with paying $7 a gallon for gasoline in their home domestic market.
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Old 01-25-2019, 10:58 AM   #24 (permalink)
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R410 systems run at double r134 pressures and generally use a variable orifice to deal with variable speed ecm controlled compressor. Some systems have a bigger accumulation trap.

Not sure if 410 is more energy efficient.

Other thing which is famous on F250: block engine coolant from interior heater when running A/C
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Old 01-25-2019, 11:28 AM   #25 (permalink)
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http://www.scielo.org.za/pdf/jesa/v19n4/01.pdf

An interesting paper on absorption AC for cooling a car.
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Old 01-25-2019, 12:20 PM   #26 (permalink)
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My car should have pwm for the blower motor control.

It iw european.

And we did have the most expensive gasoline in the world at some point, but the govt decided to cut the luxury tax on top of the tax after an economical crisis to prevent revolts.
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Old 01-25-2019, 04:04 PM   #27 (permalink)
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Quote:
Originally Posted by samwichse View Post
http://www.scielo.org.za/pdf/jesa/v19n4/01.pdf

An interesting paper on absorption AC for cooling a car.
Correct me if I am wrong, but this system also tends to stop with motor not running which I believe is the original problem
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Old 01-25-2019, 10:28 PM   #28 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
Correct me if I am wrong, but this system also tends to stop with motor not running which I believe is the original problem
?

Don't the AC systems in all non-hybrid cars stop when the motor isn't running? Or are you talking about something else...
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Old 01-26-2019, 09:49 AM   #29 (permalink)
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Afaik the a/c stops cooling when the motor is off but the circulation fans may continue to run. The OP was attempting to stay cool during a long KOEO glide.
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Old 01-26-2019, 10:45 AM   #30 (permalink)
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Ac compressor is driven off the motor.

My initial approach was to increase the evaporative fluid capacity of the system. So i can run the compressor for a bit and then use the sotred coolnes??


Note that my local driving is accelerate decelerate accelerate decelerate. Eco driving is very difficult due to the general lack of iq in the population (average of 85) ignorance of the population (you would be surprised at the amount of people who propose a perpetual motion machine fro EVs) and the lack of common sense and joy of consuming the rights of others (despite it being the only sin that is unforgivable in the local religion). Safe driving distance is a joke over here, some one immediately fills the void. And crashes of 7-8 cars is a common occurance.

So, if i can stock up on the cool while decelerating that will be a very significant contributor to FE.

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