A literature review on the squirrel-cage fans using in HVAC equipment: Powerful, efficient, and quiet operation

Jiang, Boyan; Xiao, Qianhao; Wang, Jun; Zhong, Liang; Yang, Xiaopei

doi:10.1016/j.jobe.2023.106691

Cited by 5 publications

(1 citation statement)

References 85 publications

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“…CFD simulations also help optimize airflow distribution to ensure uniform environmental conditions throughout the QC lab area. CFD analysis aids in the design of HVAC systems for contaminant control, ventilation effectiveness, and energy efficiency, contributing to operational cost savings [21].…”

Section: Literature Reviewmentioning

confidence: 99%

HVAC Design Optimization for Pharmaceutical Facilities with BIM and CFD

Liu,

Huang

2024

Buildings

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Building Information Modeling (BIM) has been widely used in the past decade to enhance the design quality of Heating, Ventilation, and Air Conditioning (HVAC) systems. However, in specialized areas such as pharmaceutical facilities, HVAC design has traditionally relied on Computer-Aided Design (CAD) drawings. This conventional approach does not allow for the simulation of temperature distribution or the verification of system efficiency, which may lead to design failures. To address these challenges in pharmaceutical facilities, this study proposed a BIM-based approach for optimizing HVAC design with Computational Fluid Dynamics (CFD). By employing CFD to simulate the dynamic airflow conditions of pharmaceutical clean rooms, the effectiveness of HVAC systems can be verified. A case study of a clean room HVAC design is presented to demonstrate the workflow. The results of the case study indicated that the pharmaceutical temperature requirements were met within 1 °C during the design optimization simulation, and there was a 95% match in the 72 h temperature mapping test during site validation. The results confirmed that using CFD with BIM not only successfully simulates the design intentions of indoor air quality but also suggests HVAC system optimization for the required clean room design. The findings of this paper contribute to the body of knowledge on overcoming the limitations of the traditional CAD-based HVAC design process and provide valuable insights on optimizing HVAC design with BIM and CFD technologies.

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Section: Literature Reviewmentioning

confidence: 99%

HVAC Design Optimization for Pharmaceutical Facilities with BIM and CFD

Liu,

Huang

2024

Buildings

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Reduced-order model and attractor identification for large eddy simulation of squirrel cage fan

Xiao,

Jiang,

Yang

et al. 2023

Physics of Fluids

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A large eddy simulation (LES) of a squirrel cage fan (SCF) provides a precise representation of turbulent flows with different degrees of complexity. This study comprehensively analyzes the coherent structures of turbulent flows in an SCF using an LES, proper orthogonal decomposition (POD), dynamic mode decomposition (DMD), and multi-resolution dynamic mode decomposition (mrDMD). An intelligent reduced-order model is established by integrating hierarchical deep learning and the sparse identification of nonlinear dynamics. The result shows that the evolution of the global DMD modes is attenuated due to the spatial distribution variations of localized high-frequency mrDMD modes, along with the fragmented and non-steady development of modal patterns. Unlike POD, DMD quantifies the quality of the impeller inlet environment and captures the antisymmetric low-dimensional flows associated with the shedding of rotating vortex structures. The interaction strength between stationary and dynamic rotating areas is accurately represented by attractors characterized by petal-like structures. The trajectory of the attractors faithfully maps the antisymmetric structural attributes, quasi-periodic behavior, and gradual attenuation characteristics exhibited by DMD modes. The number of petal-like systems and their temporal oscillations are in good agreement with the number of fan blades and their rotational cycles. This study provides new insight into fan engineering to advance flow control strategies and improve the understanding of the underlying flow mechanisms.

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Noise reduction and aerodynamic performance improvement of a multiblade centrifugal fan

Zhang,

Yang,

et al. 2024

Physics of Fluids

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Multiblade centrifugal fans are widely used in various fields. With the rapid increase in fan performance requirements, improving aerodynamic performance and reducing noise by modifying individual component parameters are no longer sufficient to meet the demands of actual engineering applications. In this work, a combined noise reduction scheme was adopted to reduce the noise level of the fan under different operating conditions while improving its aerodynamic performance. The three-dimensional unsteady flow and acoustic field of the fan were calculated simultaneously via direct computational aeroacoustics based on the lattice Boltzmann method. Experimental data from the performance test bench and the semianechoic chamber were used to validate the accuracy of the numerical simulation results. A curved-type outlet collector, a nonaxisymmetric inlet nozzle, and a variable inlet/outlet angle blade were designed on the basis of the identified acoustic sources. Different modified schemes provide varying benefits under different operating conditions, but their optimal combination not only reduces the noise of the fan but also improves its aerodynamic performance. The simulation and experimental results show that the total pressure efficiency is significantly improved at the same volume flow rate for both operating conditions and that the noise is reduced by 1.5 and 1.4 dBA. The articulation index improved by a maximum of 5.2%. This study provides a valuable reference for the design of multiblade centrifugal fans with wide operating conditions, high efficiency, and low noise.

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A literature review on the squirrel-cage fans using in HVAC equipment: Powerful, efficient, and quiet operation

Cited by 5 publications

References 85 publications

HVAC Design Optimization for Pharmaceutical Facilities with BIM and CFD

HVAC Design Optimization for Pharmaceutical Facilities with BIM and CFD

Reduced-order model and attractor identification for large eddy simulation of squirrel cage fan

Noise reduction and aerodynamic performance improvement of a multiblade centrifugal fan

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