Thermal and economic investigation of straight and U-bend double tube heat exchanger with coiled wire turbulator

• Autorzy: Andrzejczyk Rafał , Muszyński Tomasz

Identyfikatory

DOI

10.24425/ather.2019.129540

• Języki publikacji: EN

Abstrakty

EN

Experimental research has been carried out for four individual heat exchanger constructions, i.e., plain double tube, turbulized double tube, plain U-bend and U-bend with turbulator. Tests were made for the water-water system. The study covered a wide measuring range, i.e., Re = 800–9000 – on the shell side, for a constant cold water temperature of 9°C and hot water of 50°C. The heat exchangers were made from copper tubes with external diameter of 10 mm and 18 mm respectively and wall thickness of 1 mm. The helicoidal vortex generator was made from brass wire with a diameter of 2.4 mm, coil diameter of 13 mm and pitch of 11 mm. For these geometries, the values of pressure drop, heat flux and heat transfer coefficient were determined. Wire coil turbulator increased the heat transfer coefficient (HTC) over 100% and pressure drop up by 100%. The comparison of heat transfer efficiency was performed based on the number of transfer units-effectivenes (NTU-ε) method. The modified construction achieved a similar efficiency. Economic analysis of wire coil turbulator was made to validate its use in the system. It showed that a coiled wire turbulator can greatly decrease the investment cost of the double tube heat exchanger while maintaining transferred heat at a constant level.

Słowa kluczowe

EN

NTU – number of transfer units; heat exchanger; heat transfer coefficient; energy efficiency

PL

wymiennik ciepła; współczynnik wnikania ciepła; efektywność energetyczna; metoda NTU

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2019
• Tom: Vol. 40, no 2
• Strony: 17--33
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wz.

Twórcy

autor

Andrzejczyk Rafał

• Gdańsk University of Technology, Faculty of Mechanical Engineering, Narutowicza 11-12, 80-232 Gdańsk, Poland

autor

Muszyński Tomasz

• Gdańsk University of Technology, Faculty of Mechanical Engineering, Narutowicza 11-12, 80-232 Gdańsk, 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).