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Originally Posted by Groth
I wondered about that, too. Plus, a heatpipe will have optimal temperature range. How wide? How does that range relate to coolant and charge? How much will the thermal impedance vs. heatload curves change over the temperature range? Could using two coolants with different boiling points give a wide-band cooler in a single pipe?
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I think you have hit the nail on the head, as those have been the questions in the back of my mind for quite some. time. However, I have not seen any information about this in public literature. So, if the answers exist, they are either in proprietary care or they are in expensive books that are not in my library or on the internet.
I do think that using a multiple coolant heatpipe would greatly widen the effective sweet spot. I also think that even a single coolant heatpipe would probably have a wider sweet spot than we fear. For example, Bill's heatpipe data shows that it works fairly well for a ten to twenty watt range in heat input.