12 volt driven aircon

[bblaze]

Has any body set up a !2 volt driven aircon, simular to a house hold inverter type Pump. Had though a house invertor heat pump driven by a 12/240 invertor. Just sold my van after 10 years and looking at possibities to sort an all rounder system for a Toyota coaster
cheers
blaze

[LRT]

This may be of help

Products - Rencool Pty Ltd (https://www.rencool.com.au/products/)

I was looking at this for my Defender.

EV-2208 - Rencool Pty Ltd (https://www.rencool.com.au/product/ev-2208/)

[Tote]

Scavenge one from a Toyota Hybrid? i believe they are electrically driven compressors.

Regards,
Tote

[bblaze]

always a great source of info, no matter the topic
thank you
cheers
blaze

[Homestar]

This may be of help

Products - Rencool Pty Ltd (https://www.rencool.com.au/products/)

I was looking at this for my Defender.

EV-2208 - Rencool Pty Ltd (https://www.rencool.com.au/product/ev-2208/)

Any idea of current draw for these compressors? Couldn’t find the data anywhere.

[LRT]

Any idea of current draw for these compressors? Couldn’t find the data anywhere.

This page has current draw info.

StreetFX Motorsport and Graphics – RENCOOL MD18 12v OR 24v Electric Air Conditioning Compressor For Automotive/Race or Construction equipment – As used in WTF-86 (http://www.streetfx.com.au/product/md18-12v-or-24v-electric-air-conditioning-compressor-for-automotiverace-or-construction-equipment-as-used-in-wtf-86/)

[Eevo]

30-55 amps

[4bee]

This may be of help

Products - Rencool Pty Ltd (https://www.rencool.com.au/products/)

I was looking at this for my Defender.

EV-2208 - Rencool Pty Ltd (https://www.rencool.com.au/product/ev-2208/)


BLOODY HELL! Changing technology never, never ceases to amaze me.[bighmmm]

I remember the first (??) belt driven Vehicle AC compressors I can recall were 2 cylinder cast iron bodied Tecumseh from the U.S. Heavy as old ****, (not that I have weighed old **** & a figure of speech.)


No electric in those days, (only elec. driven Freezer Trucks & only then when they were parked up) etc that I was aware of & now I'm showing my age.[biggrin]

[Homestar]

That's a bit better than what I expected to be honest. [emoji106]

[1950landy]

This page has current draw info.

StreetFX Motorsport and Graphics – RENCOOL MD18 12v OR 24v Electric Air Conditioning Compressor For Automotive/Race or Construction equipment – As used in WTF-86 (http://www.streetfx.com.au/product/md18-12v-or-24v-electric-air-conditioning-compressor-for-automotiverace-or-construction-equipment-as-used-in-wtf-86/)

Whis these were around when I had my MGBGT , sold it because it was too hot to drive even in winter. I had asked a few A/C places if there were any & was tod only for trucks . I looked at putting motor driven compressor on but it would have taken too much power out of the 1800cc & in Brisbane it was always running on the hot side of the gauge so when I pulled up at the lights the thermos fan would come on. I think I would have needed to fit a bigger alternator as I had to be careful in traffic the 2X 6v batteries didn't go flat with the thermos fan running . I even thought about running a compressor off the tail shaft .
And that was only 4 years back .

[200defenda]

Just had a look on ebay you can buy a complete rencon setup for $5500 including plumbing for it,

[200defenda]

Sorry rencool

[PhilipA]

I just read a review of the new Hyundai EV which I presume has 12v air conditioning.
The writer commented on the inadequacy of the aircon, citing that it had to be on full belt to cool the car and even though the back seat passengers had vents they complained. So there may be a few more compromises with EVs than are broadcast.

It also reduced the proposed range from 230Km to AFAIR 180Km.

So My conclusion after one example is be careful that the BTU output is enough to cool a car.

Regards Philip A

[gavinwibrow]

I just read a review of the new Hyundai EV which I presume has 12v air conditioning.
The writer commented on the inadequacy of the aircon, citing that it had to be on full belt to cool the car and even though the back seat passengers had vents they complained. So there may be a few more compromises with EVs than are broadcast.

It also reduced the proposed range from 230Km to AFAIR 180Km.

So My conclusion after one example is be careful that the BTU output is enough to cool a car.

Regards Philip A


But IIRC the car with 5 passengers on board did cool down after a few km (by cold blasting the front passengers until equilibrium) - which is no different to most cars that have been sitting in the hot outside before being driven off, so maybe not write that level of option off just yet.

[jsp]

I've been watching this thread hoping someone will post something awesome! I don't have the spare coin to put a rencool system in, but I'm looking for something 12v driven as well for a project.

Anyone here actually had experience with using an electric car AC compressor? I have to hit up google!

[bblaze]

I wont spend $5 to $6k to do the job either, nearly what it cost me for the old coaster. I am still looking at options. Maybe strip down and reinvent a household invertor system and run it of an invertor
cheers
blaze

[kelvo]

Why not use a normal vehicle AC compressor, but drive it from a 12V motor instead of the engine? You can mount it pretty much anywhere, but close to the batteries would be best. There will be additional energy losses due to the belt drive though.

[LRT]

All pretty pricey still unfortunately

12 V Electric Air Conditioning Compressor – How Can You Decide Which One is Right For You? (https://www.seanhylandmotorsport.com/blog/12-v-air-conditioning-compressor-how-can-you-decide-if-one-is-right-for-you/)

[Old Farang]

HVAC is a complex subject involving many variables, be it air conditioning or refrigeration.

It is basically a matter of energy conversion, and how it is converted to useful work.
Airconditioning compressors, like most other compressors, have a useful output calculated on the displacement and RPM.

An engine driven A/C compressor in a car is not driven at a constant speed, so it is not possible to state what the output is going to be in BTU's, or any other measure, except to say that the output is going to be a lot more at high engine RPM than it is at idle speed, and continuously variable.

Rather than try and write a basic explanation the following has been stolen:


https://www.quora.com/What-is-the-typical-nominal-cooling-capacity-kw-or-BTU-h-of-a-car-air-conditioning-device (https://www.quora.com/What-is-the-typical-nominal-cooling-capacity-kw-or-BTU-h-of-a-car-air-conditioning-device)


A7.2cc/rev R134a compressor operating as HBP at 2100 RPM has a capacity of 2,076BTUs per hour.
Breaking that down:
7.2 cubic centimeters pumped per revolution.
HBP is air conditioning or dehumidifier conditions. (High BackPressure type)
That gives a capacity of 288 BTU/Hr per CC/REV at that speed.
Dividefurther by 2100 RPM is .137 BTU/Hr per CC/REV per RPM
My Geo Tracker/Suzuki Sidekick uses a relatively small Denso10P08E compressor which is 7.6CC/REV. It is roughly 3000 RPM cruising. Thatgives an educated guess as roughly 30k BTU AKA 2.5 tons capacity. At idle speedthat’s less than 1 ton capacity.
Youcan run the numbers for any other vehicle that you can find the idle and cruiseRPMs, pulley ratio to get compressor RPMs, and compressor displacement.
…………………………………………†¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â €¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦

As an old fart, lets stick to old measurements:

The BTU's per hour unit number 2,544.43 Btu/h converts to 1 hp ie, one Mechanical horsepower. It is the EQUAL power value of 1 Mechanical horsepower but in the BTU's per hour power unit alternative.

Since 1 hp equals 746 watts, and volts x amps in this case = watts, and watts divided by volts = amps, we have 746 divided by 12 = 62 amps. (will vary slightly with system voltage)

1,000 watts = 3,412 BTU.

So, I am not sure how Rencool come up with 35 - 55 amps, even using a brushless motor and BLD controller? Even at 24 volts?

[Old Farang]

The following is a bit "nerdy", but brings up some good points:

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2360&context=iracc

[350RRC]

I've been watching this thread hoping someone will post something awesome! I don't have the spare coin to put a rencool system in, but I'm looking for something 12v driven as well for a project.

Anyone here actually had experience with using an electric car AC compressor? I have to hit up google!

There's a couple of electric A/C compressors in this link Goingbush put up in another forum.

Garage Sale (https://www.thunderstruck-ev.com/garage-sale-items-ev/?fbclid=IwAR3iCpUHcN4dOWIOMpfgsvJ8uDLWOuD2-13kYaCIX9o5GWfTQ7R-dJG5Zdo)

New $500 each. US I assume.

DL

[prelude]

I just did a write up on my experiments here: 12v electric A/C compressor (https://www.aulro.com/afvb/p38a-range-rover/300259-12v-electric-c-compressor.html)

It might contain some info that people may find useful.