Heat transfer characteristics of deionized water-based graphene nanofluids in helical coiled heat exchanger for waste heat recovery of combustion stack gas

Kong, Rithy; Asanakham, Attakorn; Deethayat, Thoranis; Kiatsiriroat, Tanongkiat

doi:10.1007/s00231-018-2421-4

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…Kong et al 30 incorporated DW-based graphene nanofluids (DW/GNPs) in vertical helical coils to recover the hot exhaust gas of combustion. Compared with DW, they obtained an increase in thermal conductivity by about 13.36% and an enhancement in heat transfer coefficient by 21% to 25% at a particle concentration of 0.05%.…”

Section: Nanofluid Transport Under Laminar Flow Regimementioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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Recently, many researchers have focused on their studies on the analysis of nanofluid flows due to their participation in the enhancement of heat transfer rates in industrial processes. The ordinary fluids, such as water, mineral oils, and so on, are known for their low thermal conductivity in heat transfer processes. A significant enhancement in the thermal properties of ordinary fluid may be obtained by adding nanoparticles having a diameter of less than 100 nm or suspension of fibers. Better spreading, wetting, dispersion, and stability and with acceptable viscosity are the main advantageous properties of nanofluids on a solid surface. The nanofluids are encountered in various thermal engineering systems such as in heat exchangers, refrigeration, thermal management of fuel cells, cooling of nuclear reactors, microelectromechanical systems, and others. In particular, the thermal conversion is known as a great application of nanotechnology, and many studies have been achieved with such fluids in heat exchangers. Therefore, this paper aims to present a global insight into the different applications of nanofluids in various heat exchangers, that is, heat pipe and plate-fin heat exchangers. All research works have been summarized into three main parts: laminar, transition, and turbulent nanofluid flow regimes.

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Section: Nanofluid Transport Under Laminar Flow Regimementioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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“…Berbagai kajian untuk meningkatkan kinerja penukar kalor dengan berbagai model tube sebagai sistem pemulihan limbah panas, diantaranya kajian CFD penukar kalor tube-in-tube guna memulihkan limbah panas yang berasal dari ICE untuk pengeringan makanan [41], kajian eksperimental penukar kalor tube lurus guna memulihkan limbah panas yang berasal dari genset listrik untuk pengeringan berbagai produk [57], kajian eksperimental penukar kalor tube lurus gravitasi [58], kajian eksperimental dan teoritis karakteristik limbah panas dan pemulihan air menggunakan penukar kalor tube lurus [59], kajian teknologi dan dasar-dasar pemulihan limbah panas dari bahan granule menggunakan penukar kalor tube bank [60], kajian numerik charge dan discharge energi panas laten menggunakan penukar kalor tube serpentin [61], kajian kemajuan dan prospek manajemen termal dan limbah panas menggunakan penukar kalor tube serpentin [62], kajian kondisi operasi optimal penukar kalor serpentin sebagai sistem pemulihan limbah panas industri [63], kajian eksperimental dan teoritis pemulihan limbah panas dari sistem refrigerant menggunakan penukar kalor tube helikal [64], kajian eksperimental pemulihan limbah panas menggunakan penukar kalor tube helikal [65], kajian perpindahan panas nano fluida graphene berbasis air deoinisasi dalam penukar kalor tube helikal sebagai sistem pemulihan limbah panas [66], kajian phenomena perpindahan panas berbasis air deoinisasi pada penukar kalor tube helikal sebagai sistem pemulihan limbah panas dari stack gas pembakaran [67], dan kajian karakteristik termal penukar kalor helikal koil dengan air graphen-deoinisasi pada pemanfaatan limbah panas stack gas pembakaran [68].…”

Section: Pendahuluanunclassified

Studi Perbandingan Efektivitas Berbagai Model Tube Penukar Kalor Sebagai Sistem Pemulihan Limbah Panas

Titahelu,

Louhenapessy,

Litiloly

et al. 2023

ale

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Fokus utama penelitian ini adalah memodifikasi tube pipa lurus menggunakan berbagai model (serpentin, paralel dan helikal) tube penukar kalor sebagai sistem pemulihan limbah panas yang berasal dari generator listrik 5 kVa, Penelitian ini bertujuan untuk mendapatkan kecepatan udara sisi shell yang efektif, dimana efektivitas berbagai model (serpentin, paralel dan helikal) tube penukar kalor yang maksimal. Kecepatan udara sisi shell bervariasi dari 0.5 hingga 2.5 m/s pada panjang shell penukar kalor konstan. Pencatatan data berupa suhu, kecepatan udara sisi shell, dan laju aliran massa fluida panas (gas bekas) setelah tercapai kondisi tunak. Metode penelitian ini menggunakan kajian simulasi berdasarkan data eksperimen. Hasil penelitian menunjukkan bahwa efektivitas menurun dengan peningkatan kecepatan udara sisi shell, dimana efektivitas maksimum pada kecepatan udara minimum untuk ketiga model (serpentin, paralel dan helikal) tube penukar kalor masing-masing sebesar 50.2%, 57.1% dan 84.7%. Dapat disimpulkan bahwa model tube helikal paling efektif dimana efektivitas penukar kalor maksimum pada kecepatan udara sisi shell 0.5 m/s dan dapat digunakan selanjutnya dalam aplikasi.

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“…Oppositely, only a 4.5% heat transfer increase was confirmed for the copper aqueous nanofluid, together with 11% less coolant pumping energy for the copper-ethylene nanofluid. Similarly, authors Kong et al [55] examined waste heat recovery from combustion stack gas employing helical coiled heat exchangers and a graphene-aqueous nanofluid. It was verified that there was an up to 25% enhancement in the HTC for a graphene concentration of 0.05% wt.…”

Section: Waste Heat Recovery Using Heat Exchangersmentioning

confidence: 99%

Nanofluids as a Waste Heat Recovery Medium: A Critical Review and Guidelines for Future Research and Use

2023

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The thermal energy storage and conversion process possesses high energy losses in the form of waste heat. The losses associated with energy conversion achieve almost 90% of the worldwide energy supply, and approximately half of these losses are waste heat. Hence, waste heat recovery approaches intend to recuperate that large amount of wasted heat from chimneys, vehicles, and solar energy systems, among others. The novel class of thermal fluids designated by nanofluids has a high potential to be employed in waste heat recovery. It has already been demonstrated that nanofluids enhance energy recovery efficiency by more than 20%. Also, the use of nanofluids can improve the energy capacity of steelworks systems by around three times. In general, nanofluids can improve efficiency and reduce exergy destruction and carbon emissions in devices like heat exchangers. The current work summarizes the application of nanofluids in waste heat recovery and discusses the involved feasibility factors. Also, the critical survey of more than one hundred scientific papers enabled the overview of the environmental aspects of the nanofluid’s waste heat recovery. Finally, it discusses the main limitations and prospects of the use of nanofluids in waste heat recovery processes.

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Heat transfer characteristics of deionized water-based graphene nanofluids in helical coiled heat exchanger for waste heat recovery of combustion stack gas

Cited by 11 publications

References 25 publications

Advances of nanofluids in heat exchangers—A review

Advances of nanofluids in heat exchangers—A review

Studi Perbandingan Efektivitas Berbagai Model Tube Penukar Kalor Sebagai Sistem Pemulihan Limbah Panas

Nanofluids as a Waste Heat Recovery Medium: A Critical Review and Guidelines for Future Research and Use

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