3 ms·

I don't get it. They are injecting methanol on the outside of the precooler tubes right? What causes it to move opposite to the airflow? Capillary/wetting actio

• CarVac 11y ago
  The dehumidification is done before the precooler, I'd expect. They seem to inject it at the end, collect it somehow, then inject it upstream of the first injection location, then collect it again, then inject again upstream of that... No clue how they perform this collection action, though.
  • draggnar 11y ago
    No, it seems like the mix moves against the airflow, so they'll inject it and collect it upstream. He refers to a trick from the chemical industry. It seems like with the massive temperature difference, the mix will move (expand?) to the warmer part, and the force of this is stronger than the airflow so it moves upstream.
• pcrh 11y ago
  One of the claims in the patent I linked to above states: >A heat exchanger as claimed in claim 93, wherein the antifreeze injector comprises a plurality of injection portions and is arranged to inject a more concentrated antifreeze at a first injection portion in a first region of air flow and a more water-diluted antifreeze at a second injection portion which is more upstream than the first injection portion at a second region of air flow that is warmer than the first region. So I think they have system than repeatedly injects and collects the methanol and methanol/water mixture, re-injecting it each time upstream of the previous injection point.