Athol wrote:
> atec77 <atec77NOSPAM@[EMAIL PROTECTED]
> wrote:
>> This particular unit is for use in North America but once this is
sorted
>> Ill be doing something similar in Unzud down the bottom end ( west of
>> gore) , simple stuff like painting the lpg cylinder the right shade of
>> dark will offer a couple of degrees heating avoiding that energy
>> expenditure should see it going , wind was considered but the site Ill
>> be dealing with gets gusts exceeding 200 kl/h during storms so gas
seems
>> a better option as replacement will be every couple of months .
>
> How far below ground level do you need to go to get away from the
> atmospheric temperature variation? Enough distance below ground with an
> insulated door will see a temperature consistently over 0C.
>
> If it's on a hill, go part way down the side of the hill and do a
> horizontal bore shaft and put the tank in the end of the shaft or a
small
> carved room if in rock. The shaft only needs to be big enough to crawl
> into or for the diameter of the tank, whichever is larger. If the
ground
> is unstable, large diameter concrete drain pipes can be used to form the
> shaft.
>
> All of the pipework including the outlet of the relief should be piped
> away in hose, with lagging if necessary. The idea is to make sure that
> cooling such as from conduction of heat away along the lines does not
> exceed the rate at which heat in the ground is able to transfer into the
> tank to maintain a consistent "off" temperature.
>
> Is it going to be liquid withdrawal or vapour? Small engines will be
> vapour, while bigger ones will be liquid. The difference is im****tant
> because it affects the rate of tank cooling while the genset is running.
> In a vapour withdrawal system, the liquid in the tank is continually
> boiling off to maintain vapour pressure and the latent heat of
> va****isation of that has to be compensated for by heat going into the
> tank from outside. Liquid withdrawal has a pro****tionally smaller rate
> of vapourisation relative to rate of fuel withdrawal as it only has to
> vapourise a quantity of liquid pro****tional to the liquid withdrawal to
> maintain vapour pressure.
>
> In a vapour withdrawal system, you'd virtually have to heat the tank
> from the waste heat (not exhaust) of the genset. With liquid
withdrawal,
> the majority of the latent heat of vapourisation is handled in the
> convertor at the engine. An engine oil cooler under the tank would be
an
> effective form of heating, but might need a pair of bypass thermostats,
> one to stop excessively cold flow and another to stop excessive heating
> of the tank...
>
I will pass the info along , as for my job its perched on a mountain top
in unzud as I said so it's gonna be in a closed cinder block room on
the top so the odds of making any holes is zero but the blocks will
provide wind protection
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