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  #1  
Old 08-19-2019
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NH Bill NH Bill is offline
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Default Electric cooling fans increased horsepower

“Giddy-Up: Increasing Your Horsepower with Prevost’s New Electric Cooling Package”

I’ve seen talk about running electric cooling fans here before but not with good outcomes. This sounds different.

Comments please, I could use some more horsepower

https://www.marathoncoach.com/2019/0...JgICokh1CgfwgE
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  #2  
Old 08-19-2019
SAFCO SAFCO is offline
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i would not hesitate for a second to use that. of course integrating that into an existing coach is another story. Sounds pretty cool too me (haha)
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Old 08-19-2019
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New Flyer city buses have had this for years. Makes sense on a city bus for sure and even for a highway coach. Did you notice the 3 alternators on the Prevost?
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  #4  
Old 08-19-2019
GregOC GregOC is offline
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Unless they are solar driven, the effort to drive is still horsepower and fuel Bet there is little diference in cost of effort if any at all
Just a completely new set of issues
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Old 08-19-2019
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Cost/benefit isn't there to try to replicate this on a Wanderlodge, especially if your radiator is on the front of the bus like an FC. You could certainly fab the shroud with a bunch of small fans like that. They also have a different radiator design as far as I can tell, but details are sparse.

City buses use nowhere near the power output we do driving down the highway, so that's not a valid conmparison, either.
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Old 08-19-2019
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A city bus is in stop and go traffic with a driver who has their foot to the floor most of the time. That's unlike a Wanderlodge but the cooling requirements are also very stringent.

An FC needs a fan that can exceed the ram air while driving so electric fans might be a hindrance in some cases. This Prevost may also likely have a larger radiator which is aluminum. There is more than just fans.
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  #7  
Old 08-19-2019
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Quote:
Originally Posted by kunzelj View Post
A city bus is in stop and go traffic with a driver who has their foot to the floor most of the time. That's unlike a Wanderlodge but the cooling requirements are also very stringent.

An FC needs a fan that can exceed the ram air while driving so electric fans might be a hindrance in some cases. This Prevost may also likely have a larger radiator which is aluminum. There is more than just fans.
Less cooling capacity is needed on a city bus that starts/stops/waits and never gets up to any sustained high speed. They are also geared for it. The New Flyer XD40 has 280hp, weighs 26,000 empty. They run their engines at the highest possible temperature (as do all modern engines) which allows for the largest temperature delta possible for a more effective cooling system.

The EMP fan system for this transit bus takes 3300 watts (5hp) to run, the Prevost big boy probably takes more than that.

Prevost is offering a retrofit fan setup for other Prevost coaches. Probably costs more than I make in a year.
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Old 08-19-2019
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5HP for each fan maybe. They are selling 450 amp alternators to run those. City buses also have huge compressors to air up and down their kneeling suspensions. Different use case yes, but both will have cooling challenges. I'm sorry, what are we having a difference of opinion on?
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Old 08-19-2019
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If you need more power NHBill,you need to buy an S60 powered coach!
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  #10  
Old 08-19-2019
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Quote:
Originally Posted by kunzelj View Post
5HP for each fan maybe. They are selling 450 amp alternators to run those. City buses also have huge compressors to air up and down their kneeling suspensions. Different use case yes, but both will have cooling challenges. I'm sorry, what are we having a difference of opinion on?
5hp is not per fan, that's the whole cooling system's electrical load. And they have a 30 cfm compressor and two 24v DN50's, which are 78% efficient. So for cooling that bus I used as an example they need 5.6HP of engine HP and that's only at max cooling power. They have a giant a/c compressor that can suck 30hp, but all of the evap load goes out the roof, not at the radiator.

The difference of opinion is just that transit buses are putzing around compared to 35k+ lbs going 70mph for hours at a time.
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Last edited by badandy; 08-19-2019 at 11:46 AM.
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