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07-29-2020 #21Registered User
- Join Date
- Sep 2007
- Posts
- 424
Regarding designing a mix plenum as suggested in posts 9-11- I think most would be surprised how much effort is put into this at an OEM level. Getting Temperature Control Curve slope positive so they don't invert (temp lever goes higher, actual outlet temperature drops), outlet airflow and temperature stratification (near equal, or specified, airflow from each outlet, and equal or specified temperature difference from outlet to outlet) is where months of development work take place. Start moving components around after the heater core, and these kind of go away. It was a problem that gave me grey hair in my 20's.
But I hadn't heard of inverted temp control effects. Care to elaborate on that? I had thought it was a pretty straightforward matter of using a blend door.
In the big picture, I was thinking about the airflow sort of like airflow in an engine. Try to keep the port size consistent throughout the trip. Tight-radius bends & sharp edges are bad. Avoid tall/narrow airflow areas (at least after the cores & blend door) to help keep the temp consistent throughout the air mass.
I'm aware that there would be other issues. Colder air is denser, and denser air carries more inertia when it moves. But I'm less familiar with tackling that.