Question:

Solar THERMAL system?

by Guest44739  |  earlier

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I am studying this concept:

http://www.nytimes.com/2008/04/15/science/earth/15sola.html?_r=2&fta=y&oref=slogin

Basically, heat is stored as MOLTEN SALT then converted to steam to run a turbine.

1) Table salt or some other salt?

2) Off-the-shelf thermos bottles? I would want flasks that can be carried in a pickup bed.

3) Off-the-shelf turbine combined with a generator? Should be 220v.

4) What is the cost and likely output of a test rig?

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  1. Check out this article at the link.  It's really good.

    The simplest example of a molten salt would be to take sodium chloride ("table salt") and heat it to a red heat (greater than 801° C, or 1474° F)1 where it would melt into a liquid. This liquid is stable, has a heat capacity similar to water (by volume) and flows much like water does. The major differences are the obvious higher temperatures attainable in the molten salt state and when the salt solidifies (freezes) it contracts versus expanding like water. Thus, molten salt freezing in a pipe would not burst the pipe as water would.

    Salts are simple, usually ionic (that is the chemical bonds are a simple ionic type) and stable compounds. The most common example of which is "table salt", or sodium chloride (NaCl). Both sodium and chlorine are notoriously reactive; sodium is one of the most electropositive substances (wants to lose an electron) & chlorine one of the most electronegative (wants to take an electron). These two opposite substances readily join to form stable sodium chloride via a strong ionic bond. The melting point of sodium chloride is 801° C ( 1474° F )2, at which point it becomes a liquid, and thus a "molten salt".

    http://home.earthlink.net/~bhoglund/what...

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