[Amps] re cooling of coils

[R.Measures]

On Sep 6, 2004, at 12:35 AM, Traian wrote:

> As I know, the sodium is used for heat transfer for some
> power plant nuclear reactors also?!...

However, the coolant of choice for large electric generators is 
hydrogen gas since it carries away about 5-times as much heat as air.
>
> 73,
> Traian
>
>
> Vic Rosenthal wrote:
>
>> CLIVE COLLINS wrote:
>>
>>>  Their answer after a
>>> lot of research was to make the exhaust valve stem hollow and fill it
>>> with Sodium with significantly good results.
>>
>> Sodium valves were used in a lot of internal combustion engines, not
>> just Nortons!  The idea is that the liquid sodium inside the valve 
>> stem
>> would actually flow, thus transferring heat by convection away from 
>> the
>> valve face and through the valve guide to the cylinder head.  In the
>> case of coils, there's no obvious analogue for the cylinder head to
>> dissipate heat.
>>
>> --
>> 73,
>> Vic, K2VCO
>>
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org