Flow characteristics and structural parametric optimisation design of rectangular plenum chambers for HVAC systems

Zhang, Wanqing; Li, Angui; Zhou, Min; Gao, Ran; Yin, Yifei

doi:10.1016/j.enbuild.2021.111112

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…The roughness height is 0.15 mm for galvanized steel. Moreover, the numerical method has been verified with the full-scale experiment, the details is shown in the author's previous research [4].…”

Section: Cfd Numerical Methodsmentioning

confidence: 96%

“…Considering the performance of resistance reduction and flow uniformity of the plenum chamber, the segmented W/H is adopted to optimize the structure design. And the length of chamber is designed according to the jet development inside chamber [4]. In this study, the size of inlet/outlet of plenum chamber is the same and selected as a×b=320×160 mm, and the structural design schemes under two typical ratios of W/H=1/1 and 5/1 are given respectively.…”

Section: Physical Modelmentioning

confidence: 99%

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Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems

Zhang

Gao

2022

E3S Web Conf.

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Plenum chambers are common devices used for flow and pressure equalization in ventilation and air conditioning systems. Aiming for reducing energy consumption and improving ventilation performance, the optimal cross-sectional aspect ratio (W/H) and length (L) of the single-path unlined rectangular plenum chamber is obtained through the authors’ preliminary research. In this study, based on the analysis of interior flow characteristics of single-path plenum chamber, it is shown that the traditional chamber configuration commonly used in engineering is not an ideal structure that can achieve uniform flow distribution. The multi-orifice plate is proposed to add inside chamber to improve flow uniformity. Under the two typical design schemes of W/H=1/1 and 5/1, the effect of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber is investigated, and the optimal installation position and aperture rate of orifice plate is proposed. The optimized aperture ratio is designed to be 30% for both the two typical chamber configurations. When W/H=1/1, it is recommended to install the multi-orifice plate at the position of y/L=0.1, as for W/H=5/1, the y/L=0.3 is preferred. Besides, the fluid equalizing effect of the plenum chamber with multi-orifice plate is verified under four commonly used air ducts specifications in engineering.

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Section: Cfd Numerical Methodsmentioning

confidence: 96%

Section: Physical Modelmentioning

confidence: 99%

Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems

Zhang

Gao

2022

E3S Web Conf.

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“…Orthogonal experimental design is widely used to explore the influence law of multivariate and multilevel factors [22,23]. Therefore, the shear strength of the cassava starch adhesives were firstly designed and implemented by the orthogonal experiment.…”

Section: Range and Variance Analysis Based On The Orthogonal Experime...mentioning

confidence: 99%

Modeling and Optimization of the Shear Strength of Cassava Starch-Based Adhesives Using Artificial Intelligence Methods

Zhang¹,

He²

2022

Journal of Renewable Materials

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With the exponential growth of the computing power, machine learning techniques have been successfully used in various applications. This paper intended to predict and optimize the shear strength of single lap cassava starchbased adhesive joints for comparison with the application of artificial intelligence (AI) methods. The shear strength was firstly determined by the experiment with three independent experimental variables (starch content, NaOH concentration and reaction temperature). The analysis of range (ANORA) and analysis of variance (ANOVA) were applied to investigate the optimal combination and the significance of each factor for the shear strength based on the orthogonal experiment. The performance of all AI models was characterized by mean absolute error (MAE), root mean square error (RMSE) and regression coefficient (R 2 ) compared with the experimental ones. The GA-optimized ANN model was combined with the genetic algorithm (GA) to find the optimal combination of factors for the finalized optimized cassava starch adhesives (CSA-OP). The physicochemical properties of the cassava starch and CSA-OP were determined by the FTIR, TGA and SEM-EDS, respectively. The results showed that the numerical optimized condition of the GA-optimized ANN model was superior to the orthogonal experimental optimized condition. The sensitivity analysis revealed that the relative importance of variables was consistent with the results from ANOVA. FTIR results showed that there were high hydroxyl groups in cassava starch. TGA results showed that the residue of CSA-OP was higher than the cassava starch. SEM-EDS results showed that both the cassava starch and CSA-OP had abundant carbon and oxygen functional groups. Consequently, the obtained results revealed that the use of AI methods was an adequate approach to model and optimize the experimental variables of the shear strength of single lap cassava starch-based adhesive joints.

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“…Nada et al [5] investigated the effect of the depth of the plenum chamber on the air flow characteristics and thermal performance. Zhang et al [6] conducted numerical simulation to study the internal flow characteristics of a single-in-single-out plenum space and identified significant influencing factors through orthogonal experiments.…”

Section: Introductionmentioning

confidence: 99%

Research on spatial local resistance characteristics in a plenum space for an exhaust fan room

Chen

Zhao

et al. 2022

E3S Web Conf.

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The local resistance loss is of great importance to the structural design of the exhaust room and the selection of fan equipment. In this study, the resistance characteristics of isotropic multi-inlet and single-outlet plenum spaces are investigated using numerical simulations. Orthogonal experiment method was used to determine the key influencing factors. An empirical formula for the local resistance loss law was proposed and the internal flow characteristics of the plenum space were analysed. Results show that the fan interaction rate is an important factor for the drag loss and that the vortex zone is closely related to the magnitude of the local drag loss. The results can provide a theoretical basis for the structural design of the plenum space and the selection of fan equipment.

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Flow characteristics and structural parametric optimisation design of rectangular plenum chambers for HVAC systems

Cited by 15 publications

References 30 publications

Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems

Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems

Modeling and Optimization of the Shear Strength of Cassava Starch-Based Adhesives Using Artificial Intelligence Methods

Research on spatial local resistance characteristics in a plenum space for an exhaust fan room

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