Thermal and hydraulic characteristics of multiple row spiral finned tube heat exchangers

Abraham, Punnoose; Sharqawy, Mostafa H.; Shawkat, M.E.

doi:10.1016/j.ijrefrig.2021.05.027

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Cafiero et al [12] proposed an approach to enhance heat transfer efficiency by applying an impinging jet. Abraham et al [13] conducted a study on the heat capacity performance of heat exchangers with multiple rows of spiral fin-tubes and found that the heat transfer coefficients were almost constant for four and five rows of heat exchangers within a set Reynolds number range. Liu et al [14] designed a wavy fin and used it to increase the heat transfer coefficient in the external work fluid.…”

Section: Introductionmentioning

confidence: 99%

Simulation Research on the Optimization of Domestic Heat Pump Water Heater Condensers

Han,

Feng,

Xiao

et al. 2023

Energies

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To improve the heat transfer coefficient of a condenser, this paper proposes using a fin-tube condenser to replace a smooth-tube condenser in a domestic heat pump water heater. The finite element method is used to analyze the heat transfer coefficient of fin-tube condensers with different design parameters. By comparing the results of experiments with those obtained using CFD methods, it has been determined that the CFD method used in this study is feasible. Simulation results showed that the heat transfer coefficient enhanced clearly. The total thermal resistance of the fin-tube condenser decreased by 7% through increasing fin thickness. The total thermal resistance of the fin-tube condenser increased by 1–1.3% when fin spacing was increased. The heat transfer coefficient decreased severely and the maximum total thermal resistance of the fin-tube condenser increased by 8.7% with increasing fin height. In 600 s, when the fin spacing, fin height, fin thickness and inner diameter were 14 mm, 12.5 mm, 1.2 mm and 22.5 mm, respectively, compared to the smooth-tube condenser, the fin-tube condenser could increase the final water temperature by 18.37%, and the heat transfer coefficient would increase by about 95%. This research could provide a low-cost way to improve the heat transfer coefficient of condensers in domestic heat pump water heaters.

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Section: Introductionmentioning

confidence: 99%

Simulation Research on the Optimization of Domestic Heat Pump Water Heater Condensers

Han,

Feng,

Xiao

et al. 2023

Energies

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“…Although the structure exhibits improved thermal efficiency, its stability needs further study due to the lack of bearing parts that offer the same capacity as the support of ribs. A, Punnoose Abraham et al [12] manufactured heat exchangers with different numbers of fins. On the basis of flow heat transfer analysis, it was found that the heat transfer coefficient and Reynolds number on the air side were independent of the number of fins.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat Transfer Characteristics of a Heat Exchanger Based on a Lattice Filling

et al. 2021

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In response to the heat load requirements of the high-thrust liquid rocket engine, a light-weight lattice structure is used to fill traditional a heat exchanger. A parameterized model library of the lattice structure is established, and the relative density of the lattice structure is adjusted by changing the unit cell structure parameters to obtain different filling structures. A comprehensive comparison of heat exchangers with different filling structures performed in terms of weight, heat transfer efficiency, and turbulence intensity. Using the finite difference method, the numerical calculation of the non-steady heat–fluid–solid coupling conjugate heat transfer of the eight-lattice structure is performed, and the dynamic heat transfer process between the lattice structure and liquid oxygen is simulated using the VOF model and the SST k-ω model. The results show that the pressure of the fluid in the heat exchanger increases with increasing relative density, leading to a high outlet temperature and greatly increasing the outlet velocity. The support trusses close to the wall obviously hinder the flow of liquid oxygen, resulting in a sudden change in the flow rate behind the support trusses, driving the high-temperature fluid at the bottom to move upwards. The direction of the support trusses and the unit cell porosity have a greater impact on the liquid oxygen flow rate, which in turn affects the flow and heat transfer performance of the heat exchanger. In consideration of the heat load requirements of the heat exchanger, star-type lattices are used to fill the heat exchanger. When the flow is fully developed, the volume ratio of the heated fluid is 85.60%, and the outlet temperature is 390 K, which meets the design requirements.

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Parametric investigation and correlation development for thermal-hydraulic characteristics of honeycomb 4H-type finned tube heat exchangers

Tang

Zhou

et al. 2021

Applied Thermal Engineering

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Thermal and hydraulic characteristics of multiple row spiral finned tube heat exchangers

Cited by 10 publications

References 11 publications

Simulation Research on the Optimization of Domestic Heat Pump Water Heater Condensers

Simulation Research on the Optimization of Domestic Heat Pump Water Heater Condensers

Analysis of Heat Transfer Characteristics of a Heat Exchanger Based on a Lattice Filling

Parametric investigation and correlation development for thermal-hydraulic characteristics of honeycomb 4H-type finned tube heat exchangers

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