Title | |
Author(s) | Rithy Kong, Thoranis Deethayat, Attakorn Asanakham, Tanongkiat Kiatsiriroat |
Status | 81 views, 0 downloads Download |
Keywords | Deionized water Graphene nanofluid Heat exchanger effectiveness Helical coil Waste heat recovery |
Abstract | Overall heat transfer coefficient of helical coiled heat exchanger with graphene- deionized water (DI-water) for waste heat recovery of combustion stack gas including heat exchanger effectiveness, ε, were experimentally carried out. Various sizes of tube diameter (1.2-1.5 cm), coil diameter (19-24.5 cm), and coil pitch (2.8-6 cm) of helical coils 1-4 including different heat transfer fluids, DI-water and nanofluid (graphene nanoparticles suspended in DI-water) at different particle fractions (0.05, 0.08 wt.%) had been experimentally studied. The results based on the LMTD-method of countercurrent flows showed that higher graphene fraction resulted in higher values of heat transfer rate, overall heat transfer coefficient and heat exchanger effectiveness. The ε*-NTU*min performance curves of the helical coils in series connection for DI-water and nanofluid with 0.05 wt.% graphene were created from Shah and Sekulić model. The calculated results showed that the helical coil 1 gave the best performance. With 5 numbers of this coil and the flow rate of 2 L/min, the outlet temperature of the nanofluid at 0.05 wt.% particle fraction was 1.3ºC over than that of the DI-water. When the coil number was over 7, the nanofluid gave advantage on the outlet temperature compared with the base fluid only slightly. |
Journal | Chiang Mai Univ J Nat Sci |
Publisher/Institution | Chiang Mai University |
Field/Faculty | Faculty of Engineering |
Publication Year | 2019 |
Volumn | 18 |
Issue | 1 |
Pages | 50-67 |
DOI | https://doi.org/10.12982/CMUJNS.2019.0005 |
Recommended Citation | Rithy Kong, Thoranis Deethayat, Attakorn Asanakham, Tanongkiat Kiatsiriroat. (2019). Thermal characteristics of helical coiled heat exchanger with graphene-deionized water on waste heat recovery of combustion stack gas. Chiang Mai Univ J Nat Sci, 18, 50-67 |
Contact Email | kongrithyitc@gmail.com |