How cold on board?

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BlueSkyNick

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The highest temperature forecast on Thursday is little above zero in most places. As this has been predicted for several days, I bought an electric greenhouse heater which has an adjustable thermostat down to 5degsC, which I put on board on Sunday.

As the owners of GlenRosa were also on board, I interrupted their marital bliss and mentioned the above. The skipper of that fine vessel reckoned that the heater would rarely operate as the temperature doesn't drop so low, because of all the 'warm' sea water around.

I'm not convinced as I previously recall seeing ice on residual water in the loo and a mug left in the sink.

Does anybody have an internal thermometer in the cabin, so knows how cold it gets during these cold spells?
 
Its bound to be warmer afloat than ashore ,but still brass monkey stuff. I think if your deck has a foam or balsa core it helps. I would think that a carefully placed green house heater would be enough to stop any pipe freezing probs but not much more.

Im going sailing mon /tues in company with another boat (Im not the only mad skipper then).Was going for a free berth at a yacht club overnight but now plan on Portishead Marina mainly for electickery for the fan heater.
 
As usual, ye great big lummox, ye didnae listen. What I actually said was that if its going to get cold you need your temperature set higher than 5C more like 12C cos it'll actually do something then. What I did say was that it would'nt be on that often cos the temp is often higher than 12 and at 5 it would hardly ever be on and when it was it would be useless. All IMHO of course.
 
Its been cold enough in Barcelona this past month to have had a 800 watt oil filled rad on most of the time. This was topped up with a 2 kw fan heater.

Did not sign up for that amount of cold!!!!

Still a very pleasent 18 - 34 degs here in Myanmar now.

/forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif
 
Mike

What are you doing here in Myanmar? I'm here doing a survey for MOGE.
Currently around 65 miles south west of Sitwee.
Small world and all that.
 
Well if it doesn't go below 12, then I don't need a heater on board do I, 'cos nuffinks gonna freeze.

Anyway, I did take note of what you said and set it about 8degs.

The only way to find out the real temperature would be leave a temperature recorder on board. Has anybody actually done this?
 
You're probably Ok then cos the keel stepped masts transmit cold very effectively into the interior of the yacht and thus the craft requires more heating
 
I reckon thats crap because I happen to know that at low temperatures, $T\leq g_T\delta $, where $\delta$ is the single mean energy level spacing in a grain, the coherent electron motion at large distances dominates the physics, contrary to the high temperature ($T > g_T \delta $) behavior where conductivity is controlled by the scales of the order of the grain size. The conductivity of one and two dimensional granular metals, in the low temperature regime, decays with decreasing temperature in the same manner as that in homogeneous disordered metals, indicating thus an insulating behavior. However, even in this temperature regime the granular structure remains important and there is an additional contribution to conductivity coming from short distances. Due to this contribution the metal-insulator transition in three dimensions occurs at the value of tunnel conductance $g_T^C=(1/6\pi)\ln (E_C/\delta)$, where $E_C$ is the charging energy of an isolated grain, and not at the generally expected $g_T^C \propto 1$. Corrections to the density of states of granular metals due to the electron-electron interaction are calculated. Results compare favorably with the logarithmic dependence of resistivity in the high-$T_c$ cuprate superconductors indicating that these materials may have a granular structure.
 
It's probably important to know the water temp around the boat as I reckon the keel and all that is below the waterline acts like one big thermostat keeping the interior of the boat above freezing (assuming we are talking seawater)
 
Icicles on the deckhead

formed from the moisture breathed out by the crew.

Snow on the bunk under the slightly opened hatch.

All signs that one needs to go further south. /forums/images/graemlins/crazy.gif
 
The value of insulation!

Insulate the boat well above the waterline and the inside will keep to the temperature of the water. That's currently 6degC in my marina, according to my Tridata. It helps if the boat sits deep in the water. We broke ice going up the Thames in January last year, but even then the water temperature beneath was at 4degC
 
Re: Icicles on the deckhead

[ QUOTE ]
All signs that one needs to go further south. /forums/images/graemlins/crazy.gif

[/ QUOTE ]

Unless, of course, you're in the Southern Hemisphere!
 
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