Heat transfer in helical coil heat exchanger:An experimental parametric study

• Autorzy: Kowalski Krzysztof , Downarowicz Dorota

Identyfikatory

DOI

10.24425/cpe.2019.126104

• Języki publikacji: EN

Abstrakty

EN

Helical coil heat exchangers are widely used in a variety of industry applications such as refrigerationsystems, process plants and heat recovery. In this study, the effect of Reynolds number and theoperating temperature on heat transfer coefficients and pressure drop for laminar flow conditions wasinvestigated. Experiments were carried out in a shell and tube heat exchanger with a copper coiledpipe (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 6.6to 26.6 m/s (the Reynolds number below the critical value of 7600). Results showed that the helicalpipe provided higher heat transfer performance than a straight pipe with the same dimensions. Theconvective coefficients were determined using the Wilson method. The values for the coiled pipe werein the range of 3–40 W/m2·K. They increased with increasing the gas flow rate and decreasing thecoolant temperature.

Słowa kluczowe

EN

helical coil; heat exchanger; condensation; Wilson method; laminar flow; pressure drop

PL

wymiennik ciepła; kondensacja; Metoda Wilsona; przepływ laminarny; Spadek ciśnienia

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2019
• Tom: Vol. 40, nr 1
• Strony: 101–--114
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Kowalski Krzysztof

• West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technologyand Engineering, Institute of Chemical Engineering and Environmental Protection Processes,al. Piastów 42, 71-065 Szczecin, Poland

autor

Downarowicz Dorota

• West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technologyand Engineering, Institute of Chemical Engineering and Environmental Protection Processes,al. Piastów 42, 71-065 Szczecin, Poland

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).