[Jonny H]

tsuter, we design and build HVAC systems from 12V right up to 750V for EVs so I don't need the lecture. Right now, we are designing a system which will do thermal management for battery packs as well as cabin for a major OEM.

The Prius compressor I referred to is a high voltage one as you point out, but there is no fundamental difference to the mechanical design whatever the voltage. It's a rotating machine with a displacement - that's all. I was just stating that the 12V units we use are 18cc / 2600W and the Prius ESB20 is 20cc / 3000W.

Interestingly, your manual from 2006 shows ES18 which is 18cc - the same displacement as the 12v unit.

As you rightly point out, the other components chosen are also critical to operation of an AC. We are a Denso 'specialist' (their words) so we only use OEM heat exchangers which have the latest evaporator core technology (which has only been around for a few years). These are matched to the electric compressors so that the system is as efficient as can be. There are no aftermarket AC blower units that have this technology - it is heavily protected by the OEMs.

Every AC system has its limit of operation but by using the correct combination of components, efficiency can be maximised. On the plus side, the 911 has a small cabin which results in acceptable performance in climates up to 40 deg C.

Regarding your pressure chart, electric compressors run far less pressure. If you look in your Prius manual, the normal running PSI is stated as 1.37 to 1.57 MPa (199 to 228 psi)

Our last designed 12V system is fitted to the McLaren Solus GT. If you looked at the size of the components, based on 'conventional' AC thinking you would say it couldn't work - condenser is just 14 x 5 inches, placed in the side skirt (there is no frontal area on the vehicle as it open like an F1 car). Again, small cockpit and driver targeted vent system. It works great.

p.s. I didn't come on here to 'sell product'. I came to help out the guy with the SWB. But as usual, the trolls come out and start having a pop with supposed 'facts'. Sorry if having to correct that is viewed as 'selling'.