Characteristics of carbon-based nanofluids and their application in a brazed plate heat exchanger under laminar flow

Tun Ping Teng, Ting Chiang Hsiao, Chun Chi Chung

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7 Citations (Scopus)

Abstract

In this study, a graphite-powder-based heating and cooling processing method (GP-HCPM) was used to produce carbon-based nanofluids (CBNFs) as working fluid for a brazed plate heat exchanger (BPHE) system. Sodium dodecyl benzenesulfonate (SDBS) was added to CBNFs as a dispersant to enhance their stability, and the CBNF concentration was adjusted to 0.2 wt% (S1) and 0.6 wt% (S2). The thermal conductivity, viscosity, density, specific heat, and contact angle of the CBNFs were measured and analyzed. Finally, the CBNFs were tested in a BPHE system to evaluate the average heat exchange capacity (Q̇ex,avg), pumping power consumption (Pp), and system efficiency factor (SEF) under various temperatures (35, 40, and 45 °C) and laminar flow conditions. Results show that the Q̇ex,avg of S1 and S2 was higher than water under all experimental parameters, indicating that CBNFs exhibit a higher heat exchange performance than water. The Pp of S1 was slightly lower than that of water. The maximum Q̇ex,avg and SEF enhancement ratio of S1 and S2 was 7.54% and 7.98% and 9.19% and 7.28%, respectively. Considering the overall system efficiency of experimental parameters of the BPHE system, S1 was deemed more suitable than S2.

Original languageEnglish
Pages (from-to)160-168
Number of pages9
JournalApplied Thermal Engineering
Volume146
DOIs
Publication statusPublished - 2019 Jan 5

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Keywords

  • Average heat exchange capacity
  • Brazed plate heat exchanger (BPHE)
  • Carbon-based nanofluids (CBNFs)
  • Graphite-powder-based heating and cooling processing method (GP-HCPM)
  • System efficiency factor (SEF)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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