I've been thinking for some time about whether it makes sense to recapture some of the tons of waste heat dumped into the ocean by my two diesel
engines. In a climate where we need heat practically year around.
My first thought was to get the heat into the central heating
system, which is powered by an Eberspaecher (Espar) D10 hydronic furnace. The idea was to use heat exchangers to transfer heat from the fresh water
circuits of the two engines into the main central heating
But I've thought and thought about that and have rejected it. I realized that there is no point in putting heat into the system just to temporarily unload the furnace. How much fuel
will I save? And is it even good for the furnace, which apparently doesn't like running at idle (soots up)?
When I need continuous heat in the cabin
, the furnace will run continuously -- that's all there is to it. It would be silly to shut down the furnace for a couple of hours a day just because I'm running the generator
So my thinking now is that it would really be useful to get heat from the generator
into the calorifier
, for times when I'm not running the furnace continuously. And if I were to add a bus heater under the companionway
steps, then this is a supplementary source of space heating which can be used when motoring, for example, or just to add more heat to what the central system can do. This might be really useful to take the chill off when it's not cold enough to be running the furnace all the time.
Another thing I would like to do is add a towel dryer in the aft heads. I've got a good place for it and it adjoins the engine
room so will be easy to connect. We all know what a pain it is to dry towels in cold, wet weather
, and how nice it is to have extra heat when you're bathing. But I don't think I could run the whole volume of coolant
through it -- it would need some branch. I don't have any idea whether that will circulate naturally or not or how to engineer
What do y'all think? Waste of time and money
? I could pay for a fair amount of fuel
for the Eber for what this would cost. But it just seems so wrong
to dump all that heat into the ocean, while at the very same time I'm burning fuel to make heat.