The heat transfer to supercritical carbon dioxide has been measured in horizontal, vertical and inclined tubes at constant wall temperature for tubulent flow at Re-numbers between 2300 and 1x10~5. The influence of the variation of physical properties duc to the vicinity of the critical point has been examined, as well as the influence of the direction of flow. Therfore most of the measurements has been conducted at pseudocritical points. This are supercritical points where the behaviour of the physical properties is similar to the behaviour at the critical point, but to a lesser degree. At such points the heat capacity shows a maximum; density, viscosity and heat conductivity are changing very fast (Neumann and Hahne, 1980).
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