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GettinBetter |
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GettinBetter Crazy Courier
Joined: 20 Jun 2019 Karma :
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doggone |
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doggone World Chat Champion
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Posted: 11:44 - 11 Jan 2020 Post subject: |
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The ones in cars are electric, for a bike seat with quite a small area, and you only heat it a modest amount say 20C electric would be more realistic - whether it's worthwhile is another matter but admittedly climbing on a bike covered in frost is not very pleasant
It's extremities which get cold first though. That part of your anatomy is relatively easy to keep warm. |
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RhynoCZ |
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RhynoCZ Super Spammer
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 15:17 - 11 Jan 2020 Post subject: |
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Nobby the Bastard wrote: | It would be ridiculously complicated to use the coolant to heat the seat in comparison to an electrical element, and that's before you realise that you need to be able to remove the seat relatively easily. |
Especially on any of my bikes.. they're air-cooled!
However I do have recollection of a water-heated handle-bar, for water-cooled bikes... advantage that heat is put to the extremities that are more likely to suffer cold. ISTR it was a bit of a shedologist contraption rather than a viable commercial product and the issues, apart from tapping in to the cooling system without leaks, were that you want hot water bot ends of the bars, and dont really want hoses hanging off the ends of the grips. ISTR that that was tackled with a double-skin pipe, so water was fed into of the middle of the bar, directed to the ends via an internal pipe, then returned to the middle to return to the cylinder head. Complicated and expensive to make though, BUT the biggest issue was really to do with heat regulation; ever touched a hot cylinder head? So controlling the temperature of the grips/bars with taps and valves and 'lag' between the engine starting and water getting warm, and more getting the heat to the grip/bar and not letting it get to hot to hold.
I suspect that these issues would be as daunting on any heating system that tried to take the waste heat from the cooling system. Which is a shame, because the infernal combustion engine is horrendously inefficient, and something like 60% of the calorific value of the fuel is wasted as heat to the atmosphere, so scavenging any of it would be a very useful thing, compared to having to burn even more fuel to turn inefficiently into kinetic energy, to turn that just as inefficiently into electric, b-u-t comes down to the practicality and convenience and ultimately the 'comsumer-freindly-productionability' of the scheme.
Could be an interesting uni thesis, but I doubt it would fare very well in the Dragon's Den! ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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MarJay |
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MarJay But it's British!
Joined: 15 Sep 2003 Karma :
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GettinBetter |
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GettinBetter Crazy Courier
Joined: 20 Jun 2019 Karma :
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Posted: 20:18 - 11 Jan 2020 Post subject: |
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Teflon-Mike wrote: | ...However I do have recollection of a water-heated handle-bar, for water-cooled bikes... |
Ah, great idea.
Teflon-Mike wrote: | ...that that was tackled with a double-skin pipe, so water was fed into of the middle of the bar, directed to the ends via an internal pipe, then returned to the middle to return to the cylinder head... |
So much like the Volvo B20 marine engines head cooling arrangement then. Had to remove many a core plug to check/replace the copper pipe inside. So simple yet so effective.
Teflon-Mike wrote: | ...BUT the biggest issue was really to do with heat regulation; ever touched a hot cylinder head? So controlling the temperature of the grips/bars with taps and valves and 'lag' between the engine starting and water getting warm, and more getting the heat to the grip/bar and not letting it get to hot to hold.... |
Sounds like a job for an inline thermostat valve with a negative temp coefficient, & I don't think the time lag would be too much of an issue as you'd be warm initially when you start off on your trek, you just need something to prevent excessive heat loss.
Teflon-Mike wrote: | ...because the infernal combustion engine is horrendously inefficient, and something like 60% of the calorific value of the fuel is wasted as heat to the atmosphere, so scavenging any of it would be a very useful thing, compared to having to burn even more fuel to turn inefficiently into kinetic energy, to turn that just as inefficiently into electric... |
So true, sadly not many people realise this fact. |
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 21:37 - 11 Jan 2020 Post subject: |
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The heat coming off the radiator keeps your knees warm But other than that the most efficient way of distributing around such a small vehicle as a motorcycle has to be electricity. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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WD Forte |
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WD Forte World Chat Champion
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GettinBetter |
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GettinBetter Crazy Courier
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Polarbear |
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Polarbear Super Spammer
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Riejufixing |
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Riejufixing World Chat Champion
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GettinBetter |
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GettinBetter Crazy Courier
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Posted: 11:59 - 12 Jan 2020 Post subject: |
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Polarbear wrote: | ....The alternator on my bike has a stupidly large output though because of all the electrical gubbins on it. |
Nice, mine is the opposite, enough to run the stock bits, and that's it. I could as others have suggested on here replace stock with LED's etc, but as the max is quoted at 5krpm, then at the lower rpm you can bet it's about half the quoted 360W or less. Yet there's all that heat being wasted...mm, need a rev counter
Wouldn't it be great if I did a search and a bloody great stator was available for this model... that's where I'll start, and explore the possibility of getting it rewound, then there's the regulator which'll prolly need upgrading...
Not to mention I went out yesterday (5 degs), and wasn't cold, so maybe it's not so important anyway... |
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Islander |
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Islander World Chat Champion
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Robby |
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Robby Dirty Old Man
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GettinBetter |
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GettinBetter Crazy Courier
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GettinBetter |
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GettinBetter Crazy Courier
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Riejufixing |
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Riejufixing World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 03:01 - 13 Jan 2020 Post subject: |
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I have seen someone route the coolant through the handlebars...
I have also seen someone run corrugated ducting over the header pipe on his morini 3 1/2, attach it to a flexible hose with a computer fan on the end and stick it up his jacket. He had a hula-hoop stitched into the jacket to allow the hot air to circulate. This was great, even blew hot air up his helmet and kept the visor clear. All wen well until he rode it through a ford at which point it turned into a wearable sauna... How we laughed! ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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MCN |
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MCN Super Spammer
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2wheelLover51 |
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2wheelLover51 Two Stroke Sniffer
Joined: 17 Oct 2019 Karma :
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Posted: 22:52 - 29 Jan 2020 Post subject: Gentlemen be seated |
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If I remember correctly a while back there was a scooter which used to duct a portion of the heated air from the rad. or cylinder up towards the rider for winter heating. Needless to say it didn't work... ____________________ 2WHEElLover1951 |
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Polarbear |
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The Shaggy D.A. |
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The Shaggy D.A. Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
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Old Thread Alert!
The last post was made 4 years, 79 days ago. Instead of replying here, would creating a new thread be more useful? |
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