What is the maximum theoretical temperature a heat pipe in an evacuated tube could reach?
Answer:
Depends on the pipe... What's it made of? What pressures will it have to tolerate? What structural loads will it have to handle?
ANY fluid could be used to reach any desired temperature. You can heat water under pressure to a point where its "state" is undefined.. not really water, not really steam. but that's not the maximum temperature you can achieve. The pressure required would be high...
Overall... your question is just unanswerable because it is poorly asked.
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