Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/65917
Title: Thermal characteristics of helical coiled heat exchanger with graphene-deionized water on waste heat recovery of combustion stack gas
Authors: Rithy Kong
Thoranis Deethayat
Attakorn Asanakham
Tanongkiat Kiatsiriroat
Authors: Rithy Kong
Thoranis Deethayat
Attakorn Asanakham
Tanongkiat Kiatsiriroat
Keywords: Multidisciplinary
Issue Date: 1-Jan-2019
Abstract: © 2014 Chiang Mai University. Overall heat transfer coefficient of helical coiled heat exchanger with graphenedeionized 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 1.3°C 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.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065144705&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/65917
ISSN: 16851994
Appears in Collections:CMUL: Journal Articles

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