Numerical study and correlations for heat and mass transfer coefficients in indirect evaporative coolers with condensation based on orthogonal test and CFD approach

Wan, Yangda; Soh, Alexander; Shao, Yunlin; Cui, Xin; Tang, Yongzhi; Chua, Kian Jon

doi:10.1016/j.ijheatmasstransfer.2020.119580

Cited by 33 publications

(10 citation statements)

References 35 publications

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“…The results were compared to existing theories and showed a 4% discrepancy in average temperature values. In [22], the analysis was expanded to include the diffusion equation and virus particle movement in the air. This study found a 3% discrepancy in average temperature values over time.…”

Section: Fig 2 Residuals For a Non-stationary Problemmentioning

confidence: 99%

Numerical simulation of aerodynamics in the cabin of transport

Panfilov,

Beskopylny,

Tashpulatov

et al. 2024

E3S Web Conf.

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One of the most important tasks of transport engineering is the task of providing optimal and comfortable conditions for drivers and passengers, in particular: temperature, pressure, dust content, humidity, air speed, noise, illumination, etc. Temperature, humidity and vibration influences are also of great importance for the functioning of electronic devices and transport equipment. In this paper, a numerical-mathematical model is presented for studying the fields of temperatures, velocities, pressures, densities and humidity of air in the cabin space with simultaneous blowing by an external flow and internal ventilation. As a mathematical model, the Navier-Stokes equations in the RANS formulation are used, together with the diffusion equation, which allows calculating the mass fractions of water vapor in the domain. As a numerical implementation, the finite volume method is used together with turbulence models in the Ansуs Fluent software product. A non-stationary setting is considered, the stabilization time of flows is found; the stabilized fields are compared with the results obtained for the stationary setting. A method for obtaining numerical values of heat transfer coefficients for walls consisting of several layers of materials is also given. As a numerical experiment, a cabin of a special technological transport with a large glass area and multi- layered walls, with one driver without passengers, is considered. The obtained results are compared with the results obtained earlier without taking into account the diffusion equation and relative air humidity modeling.

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Section: Fig 2 Residuals For a Non-stationary Problemmentioning

confidence: 99%

Numerical simulation of aerodynamics in the cabin of transport

Panfilov,

Beskopylny,

Tashpulatov

et al. 2024

E3S Web Conf.

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“…The orthogonal test is a design method widely used to investigate the multifactor complex system for system design and optimization [27,28]. In the present work, considering comprehensively coupling interaction of the three functional material fillers on the rubber compound system, an orthogonal experiment was designed to obtain the optimal formula of sound insulation materials that met the high damping and excellent mechanical properties requirements.…”

Section: Orthogonal Test Designmentioning

confidence: 99%

Formulation and Performance of NBR/CR-Based High-Damping Rubber Composites for Soundproof Using Orthogonal Test

Zhu

Miao

et al. 2023

Polymers

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Multiple functional-material-filled nitrile butadiene rubber/chloroprene rubber (NBR/CR) acoustic composites were extensively studied and prepared. According to the orthogonal test table L25 (56), 25 groups of samples were prepared by using a low-temperature one-time rubber mixing process. With tensile strength, average transmission loss, and damping peak as indexes, the influence degree of different factors and levels on the properties of acoustic composites was quantitatively discussed and analyzed. The matrix weight analysis was employed to optimize the material formula of rubber composites, and the corresponding influence weight was given. Results showed that the acoustic composite with blending ratio of 70/30 for NBR/CR matrix had preferable mechanical and acoustic properties; adding mica powder (MP) and montmorillonite (MMT) in matrix contributed to improve all above three indexes owing to their specific lamellar structures; hollow glass beads (HGB) had a positive influence on improving acoustic property due to its hollow microcavities, however, it had a negative impact on damping property because of the smooth spherical surfaces. Accordingly, the optimal formulation was found to be NBR/CR blending ratio of 70/30, MP of 10 phr (per hundred rubber), HGB of 4 phr, and MMT of 10 phr.

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“…Aiming at its geometrically nonlinear behavior under large deformation, this paper uses the two-parameter Mooney-Rivlin model to describe its constitutive relationship. The model is [18]…”

Section: Constitutive Model Of Superelastic Materialsmentioning

confidence: 99%

Research and Analysis of Pressure-Maintaining Trapping Instrument for Macro-Organisms in Hadal Trenches

Wang

Chen

Wang

et al. 2020

JMSE

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The ecosystem of the abyss is one of the fields that humans hardly know. The ultra-high hydrostatic pressure makes it very difficult to obtain abyssal organisms. Samples are often severely broken during recovery due to changes in environmental pressure, temperature, and other factors. Currently, there are no macro-organism samplers suitable for the abyss. The development of a pressure-maintaining sampler for the abyss is a prerequisite for abyssal ecosystem research. This paper mainly proposed a pressure-maintaining trapping instrument (PMTI) designed to work at a depth above 10,000 m. Unlike typical deep-sea equipment, this instrument is lightweight (about 65 kg in water). The instrument adopts a new structure, using a hollow piston as the sampling space and sealing the mechanism with O-rings at both ends of the piston, thus avoiding sealing methods such as ball valves and greatly reducing the weight of the equipment. The structure and working process of the instrument are described in detail in this paper. Meanwhile, in this paper, the movement resistance of the piston (mainly the resistance of the O-ring) is analyzed using a dynamic explicit method in Abaqus. The factors affecting the friction of the O-rings are analyzed via the method of orthogonal tests and ANOVA. In addition, high-pressure tests were conducted on key parts of the instrument, and the results showed that the instrument works well at 100 MPa.

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Numerical study and correlations for heat and mass transfer coefficients in indirect evaporative coolers with condensation based on orthogonal test and CFD approach

Cited by 33 publications

References 35 publications

Numerical simulation of aerodynamics in the cabin of transport

Numerical simulation of aerodynamics in the cabin of transport

Formulation and Performance of NBR/CR-Based High-Damping Rubber Composites for Soundproof Using Orthogonal Test

Research and Analysis of Pressure-Maintaining Trapping Instrument for Macro-Organisms in Hadal Trenches

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