Computational fluid dynamics evaluation of the furniture arrangement for ventilation efficiency

2018 ◽  
Vol 39 (5) ◽  
pp. 557-571 ◽  
Author(s):  
Susana Hormigos-Jimenez ◽  
Miguel Ángel Padilla-Marcos ◽  
Alberto Meiss ◽  
Roberto Alonso Gonzalez-Lezcano ◽  
Jesús Feijó-Muñoz
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Efficiency ◽  
Indoor Air ◽  
Tracer Gas ◽  
Steady State Method ◽  
Air Movement ◽  
Ventilation Efficiency ◽  
State Method ◽  
Furniture Arrangement

People spend most of their time indoors; therefore, maintaining a good indoor air quality and meeting the requirements of comfort and energy efficiency are essential. One of the most widespread strategies to achieve this objective is improving ventilation efficiency; therefore, the main aim of this study was to show an optimization of the ventilation efficiency, in a specific room, considering 47 variations (case studies) in the furniture arrangement. For this purpose, a numerical analysis using computational fluid dynamics techniques, validated by the tracer gas decay technique, was used to assess the distribution of the age of air within the space. The concept of “age of air” was implemented in the computational fluid dynamics code through user-defined functions, using the steady-state method based on the resolution of a transport equation for an additional scalar. Variations up to 5.75% in the ventilation efficiency between the cases studied have been achieved. It is concluded that an improvement up to 1.65% can be obtained when the elements of the study are introduced in a way that facilitates the air movement towards the exhaust; therefore, improvement of the ventilation efficiency through specific furniture distributions is possible, although not significant, according to the outcomes.

Assessment of the ventilation efficiency in the breathing zone during sleep through computational fluid dynamics techniques

2018 ◽  
Vol 42 (4) ◽  
pp. 458-483
Author(s):  
Susana Hormigos-Jimenez ◽  
Miguel Ángel Padilla-Marcos ◽  
Alberto Meiss ◽  
Roberto Alonso Gonzalez-Lezcano ◽  
Jesús Feijó-Muñoz
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Airflow Obstruction ◽  
Developed Countries ◽  
Breathing Zone ◽  
Tracer Gas ◽  
Ventilation Efficiency ◽  
Distribution Parameters ◽  
Air Exchange

In developed countries, presence at home varies between 60% and 90% of the day, sleeping supposes 30%. Therefore, it is essential to ensure good indoor air quality that enhances health and benefits rest and recovery. In this context, it is necessary to achieve a balance between energy efficiency and air distribution parameters; thus, the influence exerted by the furniture of a bedroom on the air exchange efficiency, in the breathing zone during sleep, is assessed in this study. Computational fluid dynamics techniques, experimentally validated by the tracer gas (SF6) concentration decay method, are used to analyze 52 case studies corresponding to the same space, but varying both the number and the arrangement of the furniture inside. It is concluded that, in order to achieve a significant improvement in the air exchange efficiency, the number of elements included in the bedroom is not relevant, but the position of them. The highest increase in the ventilation efficiency in breathing zone is observed when the furniture is located avoiding the airflow obstruction in the area near the inlet and creating an unfilled volume of air in the area close to the outlet.

scholarly journals RECESSED BALCONY HEAT RE-ENTRY EFFECT ON FAÇADE WITH CONDENSER UNITS

2021 ◽  
Vol 48 (1) ◽  
pp. 29-36
Author(s):  
Kevin Yonathan Tanumidjaja ◽  
Danny Santoso Mintorogo ◽  
Rully Damayanti
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Heat Dissipation ◽  
Energy Performance ◽  
Cfd Analysis ◽  
Air Conditioner ◽  
Architectural Elements ◽  
Air Movement ◽  
Computational Fluid Dynamics Cfd

The use of split-type air conditioner in Surabaya results in the almost universal typical apartment layouts which feature a recessed balcony upon the building’s exterior façade which then utilized as air-conditioner condenser unit storage. Façade geometry with recessed balcony itself carries its own characteristic of surface air movement which affects the general Indoor Air Quality (IAQ) and heat dissipation of a building. Nevertheless, façade as architectural elements greatly influence building’s energy performance. Inefficiencies in heat dissipation from a condenser unit is detrimental on its performance and precipitate energy wastage. Based on computational fluid dynamics (CFD) analysis incorporated with energy performance evaluation, the effectiveness of façade geometry with recessed balcony is explored in this paper. It was found that recessed balconies are not an ideal place for condenser unit placement on a façade where many factors contributed to promoting heat re-entry from condenser units into the building’s interior.

A Study on the Performance of Stratified Air Conditioning Design in Assembly Halls – A Case Study at the Dazhi Cultural Center in Taiwan

2013 ◽  
Vol 368-370 ◽  
pp. 599-602 ◽  
Author(s):  
Ian Hung ◽  
Hsien Te Lin ◽  
Yu Chung Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Indoor Temperature ◽  
Cultural Center ◽  
Computational Fluid Dynamics Cfd

This study focuses on the performance of air conditioning design at the Dazhi Cultural Center and uses a computational fluid dynamics (CFD) simulation to discuss the differences in wind velocity and ambient indoor temperature between all-zone air conditioning design and stratified air conditioning design. The results have strong implications for air conditioning design and can improve the indoor air quality of assembly halls.

scholarly journals Analysis on Ventilation Efficiency of Standard Duck House using Computational Fluid Dynamics

2015 ◽  
Vol 57 (5) ◽  
pp. 51-60 ◽  
Author(s):  
Uk-Hyeon Yeo ◽  
Ye-Seul Jo ◽  
Kyeong-Seok Kwon ◽  
Tae-Hwan Ha ◽  
Se-Jun Park ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Ventilation Efficiency

Experimental and Computational Investigations of the Thermal Environment in a Small Operational Data Center for Potential Energy Efficiency Improvements

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Ismail Turkmen ◽  
Cem Ahmet Mercan ◽  
Hamza Salih Erden
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Efficiency ◽  
Potential Energy ◽  
High Performance ◽  
Thermal Environment ◽  
Airflow Rate ◽  
Cfd Model ◽  
Energy Efficiency Measures ◽  
Efficiency Measures

Abstract The share of equipment and power use in smaller data centers (DCs) is comparable with that of more massive counterparts. However, they grabbed less attention in the literature despite being less energy-efficient. This study highlights the challenges of setting up a computational fluid dynamics (CFD) model of a 180-m2 small-size high-performance computing (HPC) DC and the validation procedure leading to a reasonably accurate model for the investigation of the thermal environment and potential energy efficiency improvements. Leaky floors, uneven placement of computing equipment and perforated tiles preventing separation of hot and cold air, low-temperature operation, and excessive cooling capacity and fan power were identified sources of energy inefficiency in the DC. Computational fluid dynamics model predictions were gradually improved by using experimental measurements for various boundary conditions (BCs) and detailed geometrical representation of large leakage openings. Eventually, the model led to predictions with an error of less than 1 °C at the rack inlet and less than 5 °C at the rack outlet. The ultimate objective was to use the validated CFD model to test various energy efficiency measures in the form of operational or design changes in line with the best practices. Impact of leakage between the raised floor and the room, reduced airflow rate, cold-aisle and hot-aisle separation, workload consolidation, and higher temperature operation were among the phenomena tested by using the validated CFD model. The estimated power usage effectiveness (PUE) value reduced from 1.95 to 1.40 with the proposed energy efficiency measures.

Aerodynamic Analysis of High Energy Efficiency Vehicles by Computational Fluid Dynamics Simulation

2019 ◽  
Vol 32 ◽  
pp. 41-51 ◽  
Author(s):  
Victor Fuerst Pacheco ◽  
Diego Alves de Miranda
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Efficiency ◽  
High Energy ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Ansys Fluent ◽  
Fluent Software ◽  
High Energy Efficiency ◽  
Object Of Study

The growing demand for energy efficiency gains in vehicles has led to several advances in more technological and efficient driving units, projects using lighter and more resistant materials and, in particular, a deeper study of aerodynamic studies in order to understand the fluid flow around the object of study. This work presents an aerodynamic study for a vehicle of high-energy efficiency, through computational fluid dynamics simulation in Ansys Fluent software. The main objective is to obtain the traction and drag force vectors acting on the vehicle at different speeds and to better understand the airflow before, during and after contact with the vehicle. With the possession of results, it was facilitated the implementation of improvements that enabled the vehicle to operate even more efficiently.

Sign in / Sign up

Export Citation Format

Share Document