Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-11-2008, 04:51 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2008
Location: Des Moines, IA
Posts: 154

Nerdcycle - '81 Honda CM400E
Motorcycle
90 day: 61.16 mpg (US)

Trouble - '06 Kawasaki Ninja
90 day: 74.69 mpg (US)

Edna - '13 Nissan LEAF SV
Last 3: 126.4 mpg (US)

Tank - '20 Ford Expedition Limited
Last 3: 17.4 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Why does the heater core transfer heat from the coolant, not the exhaust?

It would be hot almost instantly and would allow for an air cooled engine whose temperature could be controlled precisely by the amount of air that was let into the engine compartment.

The only reason I can think of is that it would be TOO hot, but that can be solved by just placing less heat exchange material on the pipe. It's probably be just fine to run the regular pipe through the airstream.

__________________

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-11-2008, 05:02 PM   #2 (permalink)
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 122 Times in 80 Posts
Too complicated is my best guess...
  Reply With Quote
Old 10-11-2008, 05:30 PM   #3 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 22 Times in 18 Posts
If it leaks, it's poisonous gas leaking in the cabin versus engine coolant

That, and it's a whole lot easier to route a relatively clean liquid than a much hotter gas
__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Old 10-11-2008, 06:17 PM   #4 (permalink)
Mechanical Engineer
 
Join Date: Jun 2008
Location: Richmond, VA
Posts: 190

The Truck - '02 Dodge Ram 1500 SLT Sport
90 day: 13.32 mpg (US)

The Van 2 - '06 Honda Odyssey EX
90 day: 20.56 mpg (US)

GoKart - '14 Hyundai Elantra GT base 6MT
90 day: 30.46 mpg (US)

Godzilla - '21 Ford F350 XL
90 day: 8.69 mpg (US)
Thanks: 0
Thanked 7 Times in 6 Posts
trebuchet hit the nail on the head....toxic fume leaks.
__________________
  Reply With Quote
Old 10-11-2008, 06:28 PM   #5 (permalink)
Master EcoModder
 
Join Date: Sep 2008
Location: Texas
Posts: 632
Thanks: 0
Thanked 26 Times in 24 Posts
Why don't they run an absorption cycle A/C from it?
__________________
If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler...

Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
  Reply With Quote
Old 10-11-2008, 06:43 PM   #6 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 22 Times in 18 Posts
Quote:
Originally Posted by NiHaoMike View Post
Why don't they run an absorption cycle A/C from it?
I've been curious of the same thing for a few years now.... But I haven't educated myself enough on the concept to build one myself
__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Old 10-11-2008, 07:00 PM   #7 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
I have a number of vehicles where the cabin heat is gotten from exhaust heat exchangers and/or from cylinder waste heat (VW, Corvair, general aviation aircraft (but I don't own one now)). That system can be great WHEN EVERYTHING IS IN PERFECT WORKING ORDER. But, reality interrupts our little daydream (doesn't it always?). Over time exhaust systems rot out and yes, noxious fumes come into the cabin. Also, when (not if) there is an oil or gasoline leak in or near any component of this sort of heating system, all that stench comes in the cabin too.
__________________


  Reply With Quote
Old 10-11-2008, 07:09 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Oct 2008
Location: Racine, Wi
Posts: 82

Puddles - '95 Geo Metro LSI
90 day: 39.52 mpg (US)

Spec Miata - '91 Mazda Miata Club Racing

Scooter - '05 Honda Metropolitan

Monstro II - '99 Dodge Ram 1500

Kassia - '01 Mazda Miata LS

Precious - '97 Chevy 3500 Silverado Dually
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by trebuchet03 View Post
If it leaks, it's poisonous gas leaking in the cabin versus engine coolant

That, and it's a whole lot easier to route a relatively clean liquid than a much hotter gas
both good answers, I will also add.

-heat is exchanged easier, and more efficiently in a fluid
-antifreeze has an anti corrosive that should ideally keep the system working properly longer
-exhaust is wizzing out of your car as fast as possible, back pressure makes your car perform less goodish, where as the radiator fluid is restricted/slowed down by the therm to make the engine coolant exchange work better, and it doesn't _really_ effect engine performance.
__________________
  Reply With Quote
Old 10-11-2008, 07:13 PM   #9 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
Fire: I disagree with your points 1 and 3. Experience shows those not to be factors.
__________________


  Reply With Quote
Old 10-11-2008, 07:23 PM   #10 (permalink)
EcoModding Lurker
 
Join Date: Oct 2008
Location: Racine, Wi
Posts: 82

Puddles - '95 Geo Metro LSI
90 day: 39.52 mpg (US)

Spec Miata - '91 Mazda Miata Club Racing

Scooter - '05 Honda Metropolitan

Monstro II - '99 Dodge Ram 1500

Kassia - '01 Mazda Miata LS

Precious - '97 Chevy 3500 Silverado Dually
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Frank Lee View Post
Fire: I disagree with your points 1 and 3. Experience shows those not to be factors.
That's assuming that you and I agree that VW and Porsche heaters are sufficient. We don't.

__________________
  Reply With Quote
Reply  Post New Thread




Similar Threads
Thread Thread Starter Forum Replies Last Post
glow plug based coolant heater Coyote X EcoModding Central 23 09-11-2018 07:36 AM
Converting Exhaust Heat to Electricity SuperTrooper General Efficiency Discussion 13 03-20-2010 07:03 AM
Waste Heat from Exhaust TES111 EcoModding Central 35 11-21-2008 01:31 PM
Steam engine (from exhaust heat) iHero General Efficiency Discussion 23 09-08-2008 01:30 AM
850 watt tank style coolant heater - installed in the Blackfly MetroMPG EcoModding Central 4 11-28-2007 03:10 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com