Testing 4” bilge blower and accordion duct = almost total failure… “almost” because dribble of air does come through condenser. Is useless. Attaching a low profile sucker Spal to condenser was tabled idea. There’s space for Spal but then no space for air to go. Putting pusher Spal inside bucket was another direction suggested. Doable fit but… after checking CFM chart for smaller Spals… it’s a dead end---smaller Spals are comparable to bilge blower CFM.
Accordion duct is replaced with smooth bore, thin gauge product. Is modular and has universal elbows.
Retest of bilge blower with smooth bore…
Config here guestimates final duct length and number of turns, idea being to approximate air resistance imposed on blower.
Static / Blower OFF.
Blower ON - no internal deflector.
Blower ON with internal deflector. Mod to deflector may manage more air flow to top corners of condenser. Compared to dribble of air with accordion duct, air flow’s improved but only marginally. Search for more air continues...
Micro-turbine. Radio controlled (RC) jets use these. For size, is big air mover. Some units produce 10+ lbs of thrust. Big air comes at a price… units are screamers---no issue for flight but for Porsche AC app… uber dysfunctional. More downside… electrical service to “EDF” (Electric Ducted Fan) is more complicated than hooking up basic 12v blower/fan. More…
Credit to Glen, a.k.a GH85Carrera, for thinking through driving environment relative to applying a turbine. Point is: debris sucked in and onto EDF’s finely balanced blades is surly bad news. Fine-particle air filter to protect blade balance is called for. Those who know me know I’m willing to complicate design-build work to benefit from the journey taken but… adding a GUARANTEED maintenance process---aka cleaning a condenser’s air filter---checked myself and I won’t do it.
Still, EDF for this app has distinct advantages---brushless motor, compact size, aggressive air movement---am not abandoning it yet. Instead of plastic EDF seen above… an all-metal unit maybe?
More durable than plastic but to test idea… will cost around $400 (for EDF alone.) With no guarantee EDF concept will work, flushing $400 down toilet is possibility. Unappealing. Search continues…
HP computer server cooling module. Inside is “industrial grade” EDF. Reconditioned unit = $10 plus shipping. “Reconditioned…” fine word with infinite possibilities. For $10, is small caliber bullet to bite if unit craps out sooner than later.