TY - JOUR N2 - Helical coil heat exchangers are widely used in a variety of industry applications such as refrigeration systems, process plants and heat recovery. In this study, the effect of Reynolds number and the operating temperature on heat transfer coefficients and pressure drop for laminar flow conditions was investigated. Experiments were carried out in a shell and tube heat exchanger with a copper coiled pipe (4 mm ID, length of 1.7 m and coil pitch of 7.5 mm) in the temperature range from 243 to 273 K. Air – propan-2-ol vapor mixture and coolant (methylsilicone oil) flowed inside and around the coil, respectively. The fluid flow in the shell-side was kept constant, while in the coil it was varied from 6.6 to 26.6 m/s (the Reynolds number below the critical value of 7600). Results showed that the helical pipe provided higher heat transfer performance than a straight pipe with the same dimensions. The convective coefficients were determined using theWilson method. The values for the coiled pipe were in the range of 3–40 W/m2 ·K. They increased with increasing the gas flow rate and decreasing the coolant temperature. L1 - http://www.journals.pan.pl/Content/110016/PDF/09_art_CPE_2019_1.pdf L2 - http://www.journals.pan.pl/Content/110016 PY - 2019 IS - No 1 EP - 114 DO - 10.24425/cpe.2019.126104 KW - helical coil KW - heat exchanger KW - Condensation KW - Wilson method KW - laminar flow KW - pressure drop A1 - Kowalski, Krzysztof A1 - Downarowicz, Dorota PB - Polish Academy of Sciences Committee of Chemical and Process Engineering VL - vol. 40 DA - 2019.04.10 T1 - Heat transfer in helical coil heat exchanger: An experimental parametric study SP - 101 UR - http://www.journals.pan.pl/dlibra/publication/edition/110016 T2 - Chemical and Process Engineering ER -