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This paper presents measurements and predictions of a heat pipe-equipped heat exchanger with two filling ratios of R134a, 19% and 59%. The length of the heat pipe, or rather thermosyphon, is long (1.5m) as compared to its diameter (16mm). The airflow rate varied from 0.4 to 2.0kg/s. The temperatures at the evaporator side of the heat pipe varied from 40 to 70°C and at the condenser part from 20 to...