Abstract:

In this study, the effect of the length of the adiabatic section in the gravity assisted two-phase closed thermosiphon type heat pipe on the heat pipe was investigated experimentally. For this, four heat pipes with adiabatic zone lengths of 0cm (a), 5cm (b), 10cm (c) and 15cm (d) were manufactured. Pure water was used as the working fluid in a, b, c and d heat pipes of the same material and diameter. Heat pipes were actuated under the same time and conditions with solar energy in autumn and compared experimentally. The highest condenser temperatures for a, b, c and d heat pipes were 96.6oC, 74.5oC, 79.8oC and 84.8oC, respectively, in the experiments. While the highest condenser temperature was reached in (a) heat pipe where there is no adiabatic zone, the heat pipe with the longest adiabatic zone (d) ranked second.

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