10-27-2019, 03:42 PM
Thanks.
I am quite happy to have confined the 24v Papst clamp on fan to nearly its full usable speed range by twisting one potentiometer. Its airflow is impressive for the amp draw and noise produced at 29 voltsn and really at any voltage, but some fans are certainly even quieter with less amp draw down low.
Ideally, the fan would allow the minimum rotational speed of 7.43 volts, instead of the minimum start up speed of 7.8 volts, but if i need lower speeds all I need to do is bust out the jeweler's screwdriver and twist. and keep in mind that if I unplug the fan, that it will not restart on its own at 7.43 volts.
Which is basically what i have had to do with every other fan since I started manipulating voltage and fan speeds on fans which do not leave the factory with a speed controller.
The 24v Papst clamp fan is less desirable inside the van, due to the larger size and to a lesser degree, higher weight. The 92mm delta powered clamp fans are extremely capable of doing their task, of blasting my body with fast moving filtered air, but are obnoxiously loud at high speeds and still a full 106cfm short of the 24v papst fan at 29v. The velocity of air and the force behind it is more than that of the Papst though. The 92mm deltas cranked high and aimed at my sweaty t shirt after a long fiona walk yields the chills in seconds and lower rpms soon after. That power is appreciated, greatly.
i actually don't know at what voltage the Papst fan achieves 283 cfm, could be 24, could be 30v.
The Papst fans seem to be built like tanks. I think the one that I smoked must have smoked because of the sub 5$ boost buck power supply i was testing it with, but it could also have been a dud. Its amazing that the Papst fan is only 10$ + shipping, granted they want 15$ to ship it, but shipping 4 fans adds only $1.50 to that shipping price. The modern equivalent 24v papst fan, is a minimum 116$ . So these discontinued ones for 10$ is an absolute steal.
I've no idea how long this link will be valid, but here is the 10 amp buck boost power supply which is currently powering the 24v papst clamp fan. I've ordered another, even though I don't have a use for it at this time.
https://www.ebay.com/itm/10A-DC-DC-BUCK-...100623.m-1
With it at 29 volts for 15+ minutes passing ~2.3 amps to the papst fan, , the hottest part of the b/b power supply was the wirewound toroid at 99.8f. The hottest part of any heatsink was 72f in 68f ambient. This thing is not stressed at all powering the Papst fan, apparently, and as such 'should' be reliable long term, and it has no issues providing the surge amperage when I demand 29v. quickly, whereas I had to turn the potentiometer much slower with other power supplies or they would overload.
There is a processor chip on the underside I suspected might get hot and benefit from more heatsinking, but it only achieved 84f so I said F it.
In previous posts I raved about the efficacy of the 6$ Jaro fans, but I regret seeing that 200 cfm rating, and not exploring whether Delta had similar CFM offerings in a 120mm x 38mm computer fan and explored the net for prices.
Even at 14$, the delta fan is way better, as it has no detectable vibration, responds to voltage control from banshee to silent speeds, and exudes quality all around.
I have ordered 3 more Deltas ffb 1212 EHE's to phase out the Jaros, even though I really don't need to spend the money or time on replacing them, especially with winter coming.
While I rarely need the airflow at the high speeds at which the Jaros start vibrating, when I do, it would be nice if they did not start vibrating the whole van. I cranked the new window shroud fans upto the max last night briefly after making some smoke inside, and Fiona got quite alarmed. The one which I failed to improve its balance of the impeller, making it worse instead, sounded like it was going to fall apart if I left it going at max speed. BUt I was also plugged in with at 14.7v so the fans were able to get close to 14.4v, and they earn their 200 cfm rating at 12.0v.
The interior seemed to drop 12 degrees in about a minute with those Jaros blasting away. Could imitate the blazing saddles bean scene, and smell nothing. The deltas will be able to do the same without vibration and mess noise, but with more reliability.
I am quite happy to have confined the 24v Papst clamp on fan to nearly its full usable speed range by twisting one potentiometer. Its airflow is impressive for the amp draw and noise produced at 29 voltsn and really at any voltage, but some fans are certainly even quieter with less amp draw down low.
Ideally, the fan would allow the minimum rotational speed of 7.43 volts, instead of the minimum start up speed of 7.8 volts, but if i need lower speeds all I need to do is bust out the jeweler's screwdriver and twist. and keep in mind that if I unplug the fan, that it will not restart on its own at 7.43 volts.
Which is basically what i have had to do with every other fan since I started manipulating voltage and fan speeds on fans which do not leave the factory with a speed controller.
The 24v Papst clamp fan is less desirable inside the van, due to the larger size and to a lesser degree, higher weight. The 92mm delta powered clamp fans are extremely capable of doing their task, of blasting my body with fast moving filtered air, but are obnoxiously loud at high speeds and still a full 106cfm short of the 24v papst fan at 29v. The velocity of air and the force behind it is more than that of the Papst though. The 92mm deltas cranked high and aimed at my sweaty t shirt after a long fiona walk yields the chills in seconds and lower rpms soon after. That power is appreciated, greatly.
i actually don't know at what voltage the Papst fan achieves 283 cfm, could be 24, could be 30v.
The Papst fans seem to be built like tanks. I think the one that I smoked must have smoked because of the sub 5$ boost buck power supply i was testing it with, but it could also have been a dud. Its amazing that the Papst fan is only 10$ + shipping, granted they want 15$ to ship it, but shipping 4 fans adds only $1.50 to that shipping price. The modern equivalent 24v papst fan, is a minimum 116$ . So these discontinued ones for 10$ is an absolute steal.
I've no idea how long this link will be valid, but here is the 10 amp buck boost power supply which is currently powering the 24v papst clamp fan. I've ordered another, even though I don't have a use for it at this time.
https://www.ebay.com/itm/10A-DC-DC-BUCK-...100623.m-1
With it at 29 volts for 15+ minutes passing ~2.3 amps to the papst fan, , the hottest part of the b/b power supply was the wirewound toroid at 99.8f. The hottest part of any heatsink was 72f in 68f ambient. This thing is not stressed at all powering the Papst fan, apparently, and as such 'should' be reliable long term, and it has no issues providing the surge amperage when I demand 29v. quickly, whereas I had to turn the potentiometer much slower with other power supplies or they would overload.
There is a processor chip on the underside I suspected might get hot and benefit from more heatsinking, but it only achieved 84f so I said F it.
In previous posts I raved about the efficacy of the 6$ Jaro fans, but I regret seeing that 200 cfm rating, and not exploring whether Delta had similar CFM offerings in a 120mm x 38mm computer fan and explored the net for prices.
Even at 14$, the delta fan is way better, as it has no detectable vibration, responds to voltage control from banshee to silent speeds, and exudes quality all around.
I have ordered 3 more Deltas ffb 1212 EHE's to phase out the Jaros, even though I really don't need to spend the money or time on replacing them, especially with winter coming.
While I rarely need the airflow at the high speeds at which the Jaros start vibrating, when I do, it would be nice if they did not start vibrating the whole van. I cranked the new window shroud fans upto the max last night briefly after making some smoke inside, and Fiona got quite alarmed. The one which I failed to improve its balance of the impeller, making it worse instead, sounded like it was going to fall apart if I left it going at max speed. BUt I was also plugged in with at 14.7v so the fans were able to get close to 14.4v, and they earn their 200 cfm rating at 12.0v.
The interior seemed to drop 12 degrees in about a minute with those Jaros blasting away. Could imitate the blazing saddles bean scene, and smell nothing. The deltas will be able to do the same without vibration and mess noise, but with more reliability.
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