[Amps] Liquid Cooling

[Ron Youvan]

John Lyles wrote:
> At work we use oil cooling for a number of situations with high voltage. The oil gives a great benefit for insulation and allows more compact layouts. I don't know of any RF amplifiers this way, only pulse amplifiers using planar triodes and thyratrons. 
> The tube is basically sitting under the oil. However, I have not worked on any of these designs, and I believe they still require some mechanical work to force the oil to carry the heat by the anode. In one system there is a small recirculating oil pump and 
> pipes, all immersed. (not the pump motor). The oil is typically a silicone-based liquid called Envirotemp 200.  You can also used Envirotemp FR3. You can also just use transformer oil, like Shell Diala. 

   It has been very common for the rectifiers of in X-ray machines to be immersed under 
oil with the transformer, I have asked technicians what the equipment is like, they say 6 
  glowing glass tubes, six or more inches below the oil's surface is all you can see.
Remember 160 kV is about where these pulsed power supplies start.  (GE X-ray technicians 
at hospitals)
-- 
    Ron  KA4INM - The next election, I know what is going to happen, I'm going to help.