{HEAD ~ The present invention} relates to a thermal heat pump consisting of a heat pipe in which the vapor passage between the heat transfer zone to the heat supply and the heat transfer zone to {TAIL ~ the heat removal section} has a cross section which varies across its length 
{ HEAD ~ The present invention } relates to a thermal heat pump consisting of a heat pipe in which the vapor passage between the heat transfer zone to the heat supply and the heat transfer zone to { TAIL ~ the heat removal section } has a cross section which varies across its length
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