From a point at sea, to the circles of your mind, this is Austin
Shackles:

On or around 19 Jul 2003 09:14:11 GMT, "Ian Johnston"
enlightened us thusly:


Should work, as long as you get the control system OK - but I still
don't think you'll get more than 200 - 300W of cooling power, which
ain't much at all.

better than nothing,

Pump it faster = more heat gets exchanged

might require an additional radiator, but that makes it more complicated
again.

Pump it faster etc.



--

Stewart Hargrave

Faster than public transport


For email, replace 'SpamOnlyToHere' with my name

On or around Sun, 20 Jul 2003 19:15:52 +0100, Stewart
enlightened us thusly:

From a point at sea, to the circles of your mind, this is Austin
Shackles:

On or around 19 Jul 2003 09:14:11 GMT, "Ian Johnston"
enlightened us thusly:


Should work, as long as you get the control system OK - but I still
don't think you'll get more than 200 - 300W of cooling power, which
ain't much at all.

better than nothing,

Pump it faster = more heat gets exchanged

might require an additional radiator, but that makes it more complicated
again.

Pump it faster etc.

There has to be a limit to the heat exchange the heater matrix is capable of
though. But this is part of the reason for wanting a pump in the circuit as
well, of course. The ex-washing-machine pump seems to shift water fairly
impressively, I'll try hooking it up to a heater blower motor sometime soon.

--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
In Touch: Get in touch with yourself by touching yourself.
If somebody is watching, stop touching yourself.
from the Little Book of Complete B***ocks by Alistair Beaton.

On Sun, 20 Jul 2003 20:20:44 +0100, Austin Shackles
wrote:

On or around Sun, 20 Jul 2003 19:15:52 +0100, Stewart
enlightened us thusly:

From a point at sea, to the circles of your mind, this is Austin
Shackles:

On or around 19 Jul 2003 09:14:11 GMT, "Ian Johnston"
enlightened us thusly:


Should work, as long as you get the control system OK - but I still
don't think you'll get more than 200 - 300W of cooling power, which
ain't much at all.

better than nothing,

Pump it faster = more heat gets exchanged

might require an additional radiator, but that makes it more complicated
again.

Pump it faster etc.

There has to be a limit to the heat exchange the heater matrix is capable of
though. But this is part of the reason for wanting a pump in the circuit as
well, of course. The ex-washing-machine pump seems to shift water fairly
impressively, I'll try hooking it up to a heater blower motor sometime soon.

How much 240v cable have you got?
How far away from home do you intend to go?

--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!

On Sun, 20 Jul 2003 18:15:52 UTC, Stewart
wrote:

: From a point at sea, to the circles of your mind, this is Austin
: Shackles:
:
: On or around 19 Jul 2003 09:14:11 GMT, "Ian Johnston"
: enlightened us thusly:
:
:
: Should work, as long as you get the control system OK - but I still
: don't think you'll get more than 200 - 300W of cooling power, which
: ain't much at all.
:
: better than nothing,
:
: Pump it faster = more heat gets exchanged

I'd expect the limiting factor on the heat transfer to be the air side
rather than the water side.

Ian

"Austin Shackles" wrote in message
...
On or around Sat, 19 Jul 2003 01:17:54 +0100, Stewart
enlightened us thusly:

From a point at sea, to the circles of your mind, this is Austin
Shackles:


cooling the incoming air in the engine actually adds efficiency, hence
intercoolers on diesels.

Yes, you are right, though it is the larger volume of air that is
cooled rather than the lesser volume of fuel. I was also being vaguely
facetious.

The thought had crossed my mind.

But it has made me wonder further. The cooloing system of a car is
kept at a pretty constant temperature, and hence the energy supplied
to the vapouriser will be pretty constant under a given set of engine
conditions. The temperature of your air-sourced heater will fluctuate
as ambient conditions change, and will not be related to engine
conditions. I'm guessing again, but in an open loop system, the
varying density of the vapourised LPG may make a difference to engine
performance. Emissions for the MoT may be unpredictable.

maybe, dunno. can always turn it back to "hot" for the MOT.

On the pump issue that you raised elsewhere, what about an old fuel
pump? I think it would be a mistake to rely on convection - pumping
will allow you to transfer more energy in a given time. And I reckon
antifreeze may be advisable.

I've found an old washing machine pump which looks a good possibility. It
has the advantage of being made to work in hot water. not sure how well
sealed they are mind, not much pressure in yer average washing machine
outlet.

have to work out which is the supply to the heater, so the 2 pumps don't
manage to work against eachother. I tend to assume that the engine water
pump pumps "upwards", i.e. towards the top of the rad and away from the
bottom of the rad, so the heater pipe that goes into the pipe from the
bottom of the rad should be the outlet side, in theory.

--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"My centre is giving way, my right is in retreat; situation excellent.
I shall attack. - Marshal Foch (1851 - 1929)

Look on a Renault 19 16v engine and nick the Aux water pump from it, or I
think some Volvos have them, they don't shift massive amounts of water but
they are very dependable and they are quite sealed as well with the
pressures they cope with from a 16v engine I can assure you


---
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On or around Sun, 20 Jul 2003 22:27:14 +0100, Peter Hill
enlightened us thusly:

How much 240v cable have you got?
How far away from home do you intend to go?

the pump doesn't have a motor... I'll attach a 12V motor to it if i use it.
--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"If you cannot mould yourself as you would wish, how can you expect
other people to be enitrely to your liking?"
Thomas À Kempis (1380 - 1471) Imitation of Christ, I.xvi.