Constant Cylinder / Water Temperature

Bury it? Or sink it in a big pool of oil?

For your power issue, I would choose something like solar cells, rather than a crank device, which, if it is turning a generator may may sparks.

What do you mean by "constant"? +/- 10degC? +/- 1 degC? +/-0.1 degC?

One way is to keep the cylinder inside your own body. I mean either close to the body or implanted in the body by a doctor. Human body will remain at nearly constant temperature so will be your cylinder. I am bit worried about its size and purpose. Why do you want it that way?

12" x 36" inside the body????????????

A BIT worried about it's size?????????

Or are you just suggesting what to do with his question?

You are going to need some energy source.
What is available on site?

What is the temp. you wish to maintain?

What thermal loads are applied?
(I assume this is some sort of reference device.)

How close must the 'constant` range be?

Thermal inertia works only when average temperature of the place remains unchanged for day and night put together. This is very unlikely. Perhaps placing the cylinder 10m deep may be all right as for that depth temperature may not change.

This question is very interesting one and I think is of great value. I remember that well water temperature does not change much for wells of greater depths even when there is ice all over the earth.

Drill a big hole and place it under the ice some 10m to 20m deep. Ice temperature profile may be available from national Geographic or remote sensing agency or NASA.I am giving five points for this question and will experiment on this by measuring the earth temperature profile. I call it an excellent question.

Thanks for the responses.

The cannister, a testing device for cylinders, it has to be portable (mounted within a trailer), yet always at a constant temperature.

Sources of electricity are 120 ac or 12 dc. It would really interesting to find two chemicals or gasses, that when they come together or when they are shaken/stirred that they create heat.

Is there a substance or a liquid such as glycol, dry ice, that will keep the water at a select temperature (5 - 10 degress celsius or other)?

Once found, the jacket will be filled with the substance, sealed off to prevent outside contamination/water entry into the jacketed area.

You should have told that at the starting point. It is rather easier now for me to implement that.

I can develop a technology for this purpose if I am paid for it. It is very well possible. Who is responsible for making payments for this project? I will require NDA and MOU and then can transfer the technology for production. This is not a simple idea but a fool proof technology which will do the job. You can talk to the person who can take decision and come back to me.

If there's already a trailer involved, an electrical Temp.
regulating system, (probably available 'off the shelf`)
will be the simplest solution, and will not greatly increase
your ignition risks.

Get one that uses old fashion mercury switches, (all sealed),
and a hermetically sealed compressor, and the ignition risk from the
system is less than that posed by whatever pulls the trailer.

What is the problem with Ex?

You can buy, off the shelf, self regulating heater for 120V AC with a T6 rating.

Together with an off the shelf thermostat it can keep the cilinder at the temp you want.

Even 12V DC is no problem, it would require a calculation. 12V self regulating cable exists but it has no Ex approval. (Unless you buy a special version and pay for the work)

Contact us at www.tycothermal.com

Gwen