In light of the electrical resistance heating and wasted engine heat talks, it got me to ponder about this topic. 60% to 70% of the heat energy from burning fuel is not used to turn the crank. Why don’t we use exhaust heat for refrigeration? It doesn’t make sense to further tax the crank with an AC compressor. Absorption refrigeration works as long as there’s heat provided by the exhaust.
Better yet, it can be the ultimate cold air intake when we don’t need or want air conditioning. This allows the engine designers to bump up compression ratio to improve engine efficiency. With today’s variable valve timing and knock sensors, the system can revert to low compression ratio operation when we need to cool the cabin instead of the intake