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Posted by on October 16, 2007, 11:30 pm
>
>>
>>>What is the best way, what material to use to thermally insulate 12
>>>meters of sewer pipe ceramic or plastic with 60 cm diameter, from the
>>>surrounding hearth, 2 meters from the surface. Expected temperature 8
>>>to 16 degrees C
>>>Assuming the pipe will be half full of water, that represents a
>>>considerable weight. Any foam product will be compressed to the point
>>>of seriously reduce it's thermal properties.
>>>
>>>Thanks for the help
>>>
>>>John
>>
>>I know that if I ask a question I should describe the application but
>>at this time I am under a contractual agreement not to publicize the
>>application in detail.
>>
>>The 12 meters by 60 centimeters pipe will be used as a temporarily
>>storage tank for the filtered gray water from the sewer. It's located
>>2 meters below the surface and the average temperature of the water
>>is 12 degrees centigrade.
>>
>>Since the temperature of the surrounding earth is about 8 degrees
>>centigrade, we would like to insulate the pipe.
>>
>>I believe that was Peter that mentioned that there are better ways of
>>extracting the heat from the sewer. I have looked for any way of doing
>>with little success. There are a couple of installations in Oslo and a
>>proposed one for Vancouver . I would love to know of any others.
>>
>>Thanks for your help . The moment I can discuss this in detail, I will
>>do it.
>>
>>Thanks
>>
>>John
>
>I'm sure someone makes heat exchangers for this type of application.
>I've seen several that I think would work (at my favorite surplus
>store, which probalby won't help you... <g>) though they are not
>particularly cheap. In the end they may well be more cost effective
>than trying to insulate an underground pipe.
>
>What puzzles me is what is the value of water that is 12 degrees C?
>Not warm enough to heat spaces, but maybe warm enough to heat the
>incoming potable water enough to reduce heating costs there? If that
>is the case, I think I'd try a heat exchanger--the logic there is that
>much of heat would be coming at teh same time as the cold water
>source. (DOes that make sense?)
Yes Peter, it makes sense but that is not the application .
Imagine a sewer pipe coming out of hotel . plenty of hot water at an
average temperature of 12 degrees C. Filter that water and move it to
a tank that consists of a large section of another sewer pipe. Extract
the heat of that water that circulates through a heat pump and use
that heat to run a Sterling motor that couple to a generator can
charge de battery of your electric car.
Do you see now why I should isolate the water tank? Without insulation
it will lose part of the heat to the hearth around the pipe.
Regards
John
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