HVAC System Functionality Simulation Using ANSYS-Fluent

Popovici, Cătălin George

doi:10.1016/j.egypro.2017.03.1067

Cited by 25 publications

(10 citation statements)

References 5 publications

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“…at the time after t = 180 seconds (3 minutes) for A/C Split Wall with Refrigerant R-32. This results from the impact of the initial velocity of the cold air (initial velocity) and the momentum effect [1,2,12].…”

Section: Comparative Analysis Of Sensitivity Of Several Parameter Var...mentioning

confidence: 99%

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Predicting of Refrigerant Leakage in a Conditioned Room: A Numerical Study Leaks Distribution R-32 Refrigerant in a/C Split Unit

Muliawan

Pasek

2022

AEJ

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Hydrocarbon Refrigerant R-32 called difluoromethane is one alternative solution used for Air Conditioning (A/C) unit split, but the weakness is flame property. This study investigates and analyzes flammable refrigerant difluoromethane distributions in the room affected by the A/C unit's leakage. It discusses the distribution of flammable refrigerant R-32 (difluoromethane) in an air-conditioned room. The simulation uses three variations of mass flow rate (leakage) and three airflow rate variations: low, medium, and high cold airflow velocity. Numerical calculations are used in CFD ANSYS FLUENT software with a model developed by Species Transport, SIMPLE algorithm, solver using pressure-based, mesh type is the dominant quadrilateral (rectangle). Turbulent modeling uses K-Epsilon standards. CFD analysis in the transient system condition results from numerical simulation, indicating that the leak will run out after 180 seconds with 0.005 kg/s (0.5 m/s). The moderate leak rate of 0.002 kg/s for R-32 is 450 seconds (7.5 minutes). The slower 0.001 kg/s with 0.1 m/s airflows for the R-32 ends after 900 seconds (15 minutes). The air and flow mass flow can affect the distribution and directly difluoromethane to the conditioned room. The effect of airflow rates and positioning holes in the concentration leaks is also analyzed when the unit's refrigerant leak is indoors as the air conditioner works.

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Section: Comparative Analysis Of Sensitivity Of Several Parameter Var...mentioning

confidence: 99%

“…The conservation equations (the continuity mass, the momentum, the energy). The difluoromethane leakage software process was simulated in this article using CFD theory and ANSYS fluent to study the difluoromethane HC diffusion law [10,12].…”

Section: Introductionmentioning

confidence: 99%

Predicting of Refrigerant Leakage in a Conditioned Room: A Numerical Study Leaks Distribution R-32 Refrigerant in a/C Split Unit

Muliawan

Pasek

2022

AEJ

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“…[16]. It has been used in many complex applications that include airflows, complex geometries and air terminal devices [17][18][19][20], thus proving to be a valid tool and the reasonable choice for this study. During the simulation, a turbulent model k-ε was used: a model of two equations in which the turbulent viscosity depends on kinetic energy "k" and turbulent dispersion "ε" [21].…”

Section: Cfd Simulation Set-upmentioning

confidence: 99%

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

2019

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Air quality is an important factor for human well-being, and it is crucial that when using mechanical ventilation system, air is properly distributed so it reaches every user of a ventilated zone. To improve ventilation systems, and in consequence the air quality, this paper focuses on studying the impact of an air terminal device (ATD) with a dynamically changing geometry on the effectiveness of a variable air volume (VAV) ventilation system. VAV system characterizes a change in the airflow magnitude through the system when the heat gains lower, which may be a risk for human health as air may not reach the furthest parts of a zone. To combat this threat, an ATD with a dynamically changing geometry was installed. As a ventilation quality indicator, the air throw was taken under consideration. Thanks to the new ATD, the steady air throw should be maintained despite the changes in flow in the ventilation system. To achieve this, the research was divided into two stages. The first stage included a series of computational fluid dynamics simulations that considered the alteration of the airflow and the air terminal device diameter. Afterwards, verifying laboratory measurements were conducted on a laboratory stand using a particle image velocimetry (PIV) system that included an air terminal device with a changing geometry. The results of the simulations and the PIV measurements showed that the changes in the geometry of the air terminal device improve the ventilation effectiveness of a VAV system, allowing the system to maintain a constant air throw despite the changing airflow magnitude through the system.

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“…Then, the initial geometric parameters need to be optimized. With the availability of more computational power, the optimization of geometric parameters via computational fluid dynamics (CFD; stage 4) has become an increasingly valuable tool for hydrocyclone design and the analysis of the separation performances 27–29. Stages 5 and 6 refer to the manufacturing and to the experiments based on the optimized hydrocyclone.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydrocyclone Geometry via Rapid Optimization Based on Computational Fluid Dynamics

et al. 2021

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Hydrocyclones exploit density gradients for the centrifugal separation of dispersions in a continuous liquid. Selection of the geometrics for optimal separation is case specific, like the media characteristics. The existing optimization method based on computational fluid dynamics (CFD) provides a powerful analytical tool but requires long computational times. The most common praxis for CFD optimization is via the single‐factor optimization method (SFOM). In this study, a novel approach is presented as an improved rapid optimization method that implements a dynamic‐mesh and user‐defined function optimization method (DUOM). The DUOM adapts the dynamic‐mesh approach from other applications to the optimization analysis of hydrocyclones. The DUOM reduced the computational time by 31.1 %, compared to the SFOM.

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HVAC System Functionality Simulation Using ANSYS-Fluent

Cited by 25 publications

References 5 publications

Predicting of Refrigerant Leakage in a Conditioned Room: A Numerical Study Leaks Distribution R-32 Refrigerant in a/C Split Unit

Predicting of Refrigerant Leakage in a Conditioned Room: A Numerical Study Leaks Distribution R-32 Refrigerant in a/C Split Unit

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

Analysis of Hydrocyclone Geometry via Rapid Optimization Based on Computational Fluid Dynamics

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