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The potential on the right car is huge: but what actually is bloody "Performal"? Time to let you into a secret - and some of you may have already guessed. "Performal" doesn't exist but a substance with very similar characteristics is commonly available. It is called paraffin wax, and is sold for use in making candles. Specifically, its typical characteristics are:
Melting point: 52 degrees C
Specific heat: 3.27 kJ per kg per degree C
Specific heat of fusion: 210 kJ/kg
So to increase the temp of 1kg of the wax from 47 to 52 degrees takes 16.35kJ, but to push it past 52 degrees takes nearly 13 times as much energy. (Or, to risk causing confusion, you could dissipate in it a power of 14kW for 15 seconds to melt 1kg.)
Paraffin wax is non-toxic, doesn't explode (although it will catch fire if you expose it to a naked flame) and is easily handled. Special waxes designed specifically for this change-of-state heat storage purpose are also available with melting points in 10-degree C increments from 50 degrees to 100 degrees C, however their availability is obviously less than simple candle wax.
The easiest approach to making a fusion intercooler would be to obtain a small air/air intercooler core, which has adequate airflow for the application. The core could be sealed with sheet aluminium welded into place, much as the water/air design shown here was constructed. The assembly could then be heated to perhaps 60 degrees C in an oven and before having its core completely filled with molten wax - but with a small gap left for expansion. The resulting assembly would then need to be insulated from underbonnet heat, perhaps by being placed in a larger box and having the gaps filled with expanding foam applied with a spray can.
As I said above, the car that I had hoped to apply the technology to isn't suitable: its off-boost intake air temp is too high. However, in the past I have owned turbo cars where the off-boost intake air temp was only 5-10 degrees above ambient, and these would be suitable for the technique. Remember, this approach would not be appropriate for race cars or for cars spending long times on boost on a dyno; it would however be very suitable for turbo cars where packaging is very tight (or a rear- or mid-mounted engine is used) and where in normal road use the duration of boost is limited.
It's a fascinating concept, which as the URLs below show is now being used in other industries and applications. (To find more links do a web search under 'phase change materials heat storage' or similar.) Equipped with a wax or other phase change material that melted at (say) 65 degrees C, the fusion intercooler could even be used as a 'safety' heatsink, able to knock the top of peaks that only rarely occur, or occur for only a very short period.
Either as a main intercooler/heatsink, or as an additional safety device, it's certainly something with huge real-world potential.