Back in the 60's I worked on Gvt. Military Radar Jammers, we used coolent oil in the Jammers for 2 reasons. One to cool the Vacuum tubes in the box and for High Voltage insulation. 10kv riding on 5kv at 10 amps. Pretty leathel. However the oil was poured in and the box sealed to keep dirt out. The case was cooled with fans. Cooling with coolent oil is a proven technology. However I beleive without having the case sealed from dust and dirt eventually it would cause problems.
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Back in the 60's I worked on Gvt. Military Radar Jammers, we used coolent oil in the Jammers for 2 reasons. One to cool the Vacuum tubes in the box and for High Voltage insulation. 10kv riding on 5kv at 10 amps. Pretty leathel. However the oil was poured in and the box sealed to keep dirt out. The case was cooled with fans. Cooling with coolent oil is a proven technology. However I beleive without having the case sealed from dust and dirt eventually it would cause problems.