What a cool idea (exchanging heat for pressure in brewing)... it would be quite fun to mess around with...
The blogs he references seem pretty cool too at first glance for those interested in food.
Another random idea for those who can switch your elements off and still run your pump (synesso)...cold brew a shot and see what it tastes like...probably too short of an extraction but maybe if you grind superfine and run 12oz water or so....???
Let me know if you try it...i'd be curious to taste.