Heat transfer phenomena on waste heat recovery of combustion stack gas with deionized water in helical coiled heat exchanger

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

doi:10.1016/j.csite.2018.04.010

Cited by 21 publications

(8 citation statements)

References 18 publications

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“…The details of the properties and the stability of the nanofluid were described in the M.Eng. dissertation of Kong et al, (2018) and some of the results were shown in Figure 4. Figure 4.…”

Section: Nanofluid Preparationmentioning

confidence: 99%

“…Xin and Ebadian, (1997) also stated a correlation with the effects of Reynolds and Prandtl numbers and coil dimensions such as tube dimeter and coil diameter on local and average convective heat transfer coefficients for air, water, and ethylene glycol flowing inside helical coils under the constant wall heat flux condition. The correlations of Schmidt et al, (1967) and Xin and Ebadian, (1997) could also be applied for deionized water of which the heat transfer results were found to be better than those of normal water (Kong et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Characteristics of Helical Coiled Heat Exchanger with Graphene-Deionized Water on Waste Heat Recovery of Combustion Stack Gas

Kong¹,

Deethayat²,

Asanakham³

et al. 2019

CMUJNS

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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 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.

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“…The details of the properties and the stability of the nanofluid were described in the M.Eng. dissertation of Kong et al, (2018) and some of the results were shown in Figure 4. Figure 4.…”

Section: Nanofluid Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of Helical Coiled Heat Exchanger with Graphene-Deionized Water on Waste Heat Recovery of Combustion Stack Gas

Kong¹,

Deethayat²,

Asanakham³

et al. 2019

CMUJNS

Self Cite

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“…Different forms of heat exchangers can be found in the literature. Shell and tube, plate, double pipe, heat pipes, and helically coiled heat exchanger are some of them [36]. Due to the secondary vortex flow which is generated inside the helical coils because of their curvature, and also thinner thermal boundary layer in the flow inside them, helical coils tend to provide a better transfer coefficient [37].…”

Section: Introductionmentioning

confidence: 99%

“…Kong et al [36] examined some geometrical parameters in a helical-coil heat exchanger which was designed for heat recovery applications. These geometrical parameters included pitch length and tube and coil diameters.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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Nowadays electrical power is one of the most vital requirements for daily life and industries. Since with the rise of the human population, providing electrical energy is an important challenge, some methods should be used to reduce the electrical demand or shift the demand from peak-hours to off-peak hours. Ice storage systems are one of the devices which can be used for this purpose. In this article, a transient 3D numerical simulation was carried out to investigate the effects of two geometrical parameters of double helical coil heat exchanger in the charging process of an ice storage system with the volume of 15 L. These parameters were helical coil pitch length and the distance between inner and outer coils. The results indicated that with higher values for pitch length and inner and outer coils distance, compared to smallest values for these parameters, the distribution of formed ice in the storage improves and the rate of ice formation increases by 22.81% and 13.99%, respectively. Increasing these values can also retard the ice block formation which is an undesirable phenomenon in the external discharge process of the ice storage systems.

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“…Bin et al [8] has employed high-efficiency centrifugal heat pumps to regenerate the secondary heat. The authors in [9] have studied the waste heat recovery and heat transfer mechanism in vertical helical coils theoretically and experimentally. It is deduced the small coil diameter provides effective heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

New construction methodology-geothermal cogeneration plant efficiency improvements for environmental and economic sustainability using waste heat recovery system

Jose

Prasanna²,

Prakash³

2018

IJET

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Power station is used in geothermal cogeneration or Combined Heat and Power (CHP) plant to generate electric power and heat from a single process simultaneously. Industrial CHP gains attention due to its sustainability and its nature of carbon footprint reduction. In this regard, CHP is more effective than generating steam or burning fuel on-site, and electricity is imported from the grid. CHP is a combined system which finds applications in several techniques and thermal and fuel systems, and these functionalities can be integrated into prevail-ing building structures. In CHP, the modifications are carried out with respect to the energy and user requirements. In heat recovery mecha-nism of CHP plant, several critical parameters are required. The present research work focuses on heat recovery analysis in geothermal co-generation (CHP) plant, in which the methods to lessen the generated secondary (waste) heat is emphasized by enhancing energy efficiency. Further it also includes passive and active strategies. The recent trends of direct electric conversion devices are more useful, and therefore can be introduced in industrial waste heat recovery applications, which are usually applied in CHP or geothermal cogeneration plants includ-ing paper mills and chemical processing and refinery systems, hotels, hospitals, industries and commercial structures, where constant heat and power requirements exist.

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Heat transfer phenomena on waste heat recovery of combustion stack gas with deionized water in helical coiled heat exchanger

Cited by 21 publications

References 18 publications

Thermal Characteristics of Helical Coiled Heat Exchanger with Graphene-Deionized Water on Waste Heat Recovery of Combustion Stack Gas

Thermal Characteristics of Helical Coiled Heat Exchanger with Graphene-Deionized Water on Waste Heat Recovery of Combustion Stack Gas

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

New construction methodology-geothermal cogeneration plant efficiency improvements for environmental and economic sustainability using waste heat recovery system

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