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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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heat exchangers
I'm sure I've seen heat exchangers on small engine
exhausts; the idea being to recover the generator's waste heat while running things in the house. It may have been on a RV generator, but I don't recall. Does this ring a bell with anyone here? -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#2
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heat exchangers
David Lesher wrote:
I'm sure I've seen heat exchangers on small engine exhausts; the idea being to recover the generator's waste heat while running things in the house. It may have been on a RV generator, but I don't recall. Does this ring a bell with anyone here? Chris Craft direct replacement heat exchanger allows use of hot water cabin heater in cooler climates. http://www.go2marine.com/category.do?no=14018 -- John R. Carroll |
#3
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heat exchangers
David Lesher wrote:
I'm sure I've seen heat exchangers on small engine exhausts; the idea being to recover the generator's waste heat while running things in the house. It may have been on a RV generator, but I don't recall. Does this ring a bell with anyone here? http://tinyurl.com/yd6vntz -- John R. Carroll |
#4
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heat exchangers
Alas, neither cite fits the bill. One is a marine water-to-water unit, it appears; the other URL is a paper on engine heat. Neither is useful on a 2 cyl. aircooled generator. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#5
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heat exchangers
David Lesher wrote:
Alas, neither cite fits the bill. One is a marine water-to-water unit, it appears; the other URL is a paper on engine heat. Neither is useful on a 2 cyl. aircooled generator. Original VW beetle heat exchangers maybe. I don't know the details from having one, although I know some people that have, but they used exhaust heat exchangers to heat the cabin air. IIRC the only problem was when the heat exchangers became perforated and started passing exhaust into the cabin air. |
#6
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heat exchangers
David Billington wrote: David Lesher wrote: Alas, neither cite fits the bill. One is a marine water-to-water unit, it appears; the other URL is a paper on engine heat. Neither is useful on a 2 cyl. aircooled generator. Original VW beetle heat exchangers maybe. I don't know the details from having one, although I know some people that have, but they used exhaust heat exchangers to heat the cabin air. IIRC the only problem was when the heat exchangers became perforated and started passing exhaust into the cabin air. Yes, any plan to capture generator waste heat should include redundant CO detectors. If going this route, the entire generator should be enclosed to capture the heat radiated from the block as well, with combustion air ducted in to the carb from outside, the exhaust routed through a few turns of oversized pipe and then outside, and fan forced cooling air over the whole mess. |
#7
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heat exchangers
On Thu, 11 Feb 2010 20:11:24 +0000, David Billington
wrote: David Lesher wrote: Alas, neither cite fits the bill. One is a marine water-to-water unit, it appears; the other URL is a paper on engine heat. Neither is useful on a 2 cyl. aircooled generator. Original VW beetle heat exchangers maybe. I don't know the details from having one, although I know some people that have, but they used exhaust heat exchangers to heat the cabin air. IIRC the only problem was when the heat exchangers became perforated and started passing exhaust into the cabin air. To the best of my knowledge, the VW heating system directed engine cooling air into the cabin, and very little of it at that. In 1963 they started installing a gasoline fired heater which I found totally unreliable although the latter models were somewhat improved. On the other hand, an "after market" accessory for the model "A" Ford was a cast iron shroud around the manifold ducted to a butterfly valve through the firewall into the area of the front seat passenger's knees. Gerry :-)} London, Canada |
#8
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heat exchangers
"Gerald Miller" wrote in message ... On Thu, 11 Feb 2010 20:11:24 +0000, David Billington wrote: David Lesher wrote: Alas, neither cite fits the bill. One is a marine water-to-water unit, it appears; the other URL is a paper on engine heat. Neither is useful on a 2 cyl. aircooled generator. Original VW beetle heat exchangers maybe. I don't know the details from having one, although I know some people that have, but they used exhaust heat exchangers to heat the cabin air. IIRC the only problem was when the heat exchangers became perforated and started passing exhaust into the cabin air. To the best of my knowledge, the VW heating system directed engine cooling air into the cabin, and very little of it at that. They were exhaust heat exchangers, Gerry, as Dave Billington mentioned. Living in Michigan when I had my '64 VW, I became intimately familiar with them. g They had insufficient output, especially for the windshield defroster. By the time the air got up there is was barely warm and the flow rate was feeble. The original equipment just bled a bit of cooling air from the high-pressure area under the sheet metal cooling shroud. The cure was one or two blower-boosters that we usually bought from J.C. Whitney. You could get one for each side. They worked like a charm. -- Ed Huntress In 1963 they started installing a gasoline fired heater which I found totally unreliable although the latter models were somewhat improved. On the other hand, an "after market" accessory for the model "A" Ford was a cast iron shroud around the manifold ducted to a butterfly valve through the firewall into the area of the front seat passenger's knees. Gerry :-)} London, Canada |
#9
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heat exchangers
The VW ones were air to air; the inner exhaust pipe was cast iron, like a manifold. The outer part was sheet metal and soon leaked, but that was not a hazard...it just reduced the output. I'm hoping to heat water with the exhaust. I saw one once; I assume it had a tubing coil wrapped around the pipe, but just got a glance at it years back. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#10
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heat exchangers
David Lesher wrote:
The VW ones were air to air; the inner exhaust pipe was cast iron, like a manifold. The outer part was sheet metal and soon leaked, but that was not a hazard...it just reduced the output. I'm hoping to heat water with the exhaust. I saw one once; I assume it had a tubing coil wrapped around the pipe, but just got a glance at it years back. Check the marine engines. We do this all the time to keep salt water out of the engine cooling jackets. -- Richard Lamb http://www.home.earthlink.net/~cavelamb/ |
#11
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heat exchangers
cavelamb writes:
Check the marine engines. We do this all the time to keep salt water out of the engine cooling jackets. But those are for liquid-cooled engines; this is not one. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#12
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heat exchangers
"David Lesher" wrote in message ... The VW ones were air to air; the inner exhaust pipe was cast iron, like a manifold. The outer part was sheet metal and soon leaked, but that was not a hazard...it just reduced the output. I'm hoping to heat water with the exhaust. I saw one once; I assume it had a tubing coil wrapped around the pipe, but just got a glance at it years back. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 There are industrial ones that are pricey like these: http://polarpowerinc.com/products/he..._exchanger.htm http://www.ejbowman.co.uk/products/E...Exchangers.htm I suppose you could also adapt a standard household gas fired water heater. One of the ones with the helical gas coil inside would probably be more efficient than the straight tube up the center type Art. |
#13
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heat exchangers
On Feb 10, 6:04*pm, David Lesher wrote:
I'm sure I've seen heat exchangers on small engine exhausts; the idea being to recover the generator's waste heat while running things in the house. It may have been on a RV generator, but I don't recall. Does this ring a bell with anyone here? -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 I have not seen them for small, ie less than ~50 Hp, but exhaust to water exchangers are common for exhaust heat recovery on larger engines. One thing you might want to watch if making one, is that the water vapor in the exhaust will condense, and it will be corrosive due to sulfur content in the fuel. Hence the unit should be made of stainless or something else that won't corrode. A simple shell and tube unit would be easy to fabricate from some tubing. Be sure and have a T & P valve or relief valve in case water circulation is lost. |
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