Performance improvement of the heat recovery unit with sequential type heat pipes using TİO2 nanofluid
Künye
Öztürk, A., Özalp, M., Sözen, A., & Guru, M. (2019). Performance improvement of the heat recovery unit with sequential type heat pipes using TiO2 nanofluid. Thermal Science, 23(3), 1755-1764.Özet
This paper deals with the improvement of thermal performance of the heat recovery
system in air-to-air unit by using a nanofluid of TiO particles and distilled water. The 2
experimental set-up equipped with 15 copper pipes of a 1000 mm length, 10.5 mm inner
diameter, and 12 mm outer diameter was used. The evaporator section consists of 450
mm of heat pipes, the condenser section is 400 mm, and the adiabatic section is 150 mm.
In experimental studies, 33% of the evaporator volumes of heat pipes were filled with
working fluids. Experiments were carried out at temperatures between 25 ºC and 90 ºC by
using five different cooling air-flows (40, 42, 45, 61, and 84 g/s), and two different heating
powers (3 kW and 6 kW) for the evaporation section, to determine heat removed from the
condensation section. Trials were performed for distilled water and nanofluid
respectively, and the results were compared with each other. Results revealed that a 50%
recovery in the thermal performance of the heat pipe heat recovery system was achieved
in the design using TiO nanofluid as the working liquid, at a heating power of 3 kW, air 2
velocity of 2.03 m/s and air-flow of 84 g/s