Re: Heating a calorifier from the engine


Steve Atty wrote:
> Graham Brooker wrote:
> > Sorry I cannot offer any help of this subject, but I am curious as to what
> > temperature the engine cooling water must reach to be of any use in heating
> > a calorifier.
> >
> > My Bukh DMV10 engine runs at 60 deg C which is within the official engine
> > spec and is the temperature rating stamped on the thermostat housing and is
> > consistent with the reading on the temperature gauge. I tested the
> > thermostat in a saucepan of water to confirm it opens and closes correctly.
> > The system is open vented so is not expected to reach high temperatures
> > under normal working conditions.
> >
> > If a calorifier is to be fitted then I assume you would need a much hotter
> > engine with probably a pressurised cooling system like on a vehicle. I do
> > not intend to try fitting one on my boat but cannot see how it would ever
> > work if I did.
> >
> > Graham Brooker
> >
>
> Our BMC 1.5 seems to run at a nice solid 80, rising a bit when you
> really push upstream against the flow on the eastern arm on the Severn
> at Gloucester.
>
> Once the thermostat opens it works a treat - but I suspect 60 would be a
> bit too cool

Well... not really. In fact it's too hot. You couldn't hold your hand
in water aT 60 degrees for long [why can't I find that little round
degree sign on my keyboard? I know it's there somewhere.] You may be
able to put your hand in water at 40-45.

Most domestic systems regulate on the thermostat at about 60-65. But
hands up all those who then run cold water into the hot to make it
comfortable.

That is actually wasted energy. You are overheating the water then
cooling it down again for use. This is worth bearing in mind when
heating water by gas boiler.

In fact a calorifier heated by engine coolant works very efficiently,
and temperature can be regulated by use of a 12v cylinderstat and 12v
motorised valve. Finding a 12v motorised valve and stat is not so easy,
but domestic ones can be run off an inverter without too much battery
discharge, bearing in mind they are only in use with the engine
running, and thus charging said batteries. But then again, the heat in
the engine coolant is wasted to the canal normally, so why not use it.

Boat plumbing and central heating design is still in its infancy in
most cases.

Tony H

.

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