CFD simulation for the improvement of thermal comfort

ATZ worldwide ◽  
2009 ◽  
Vol 111 (5) ◽  
pp. 18-22
Author(s):  
Giobanni Lombardi ◽  
Marco Maganzi ◽  
Ferdinando Cannizzo ◽  
Giampiero Solinas
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation

Comparative research on the air pollutant prevention and thermal comfort for different types of ventilation

2020 ◽  
pp. 1420326X2092552
Author(s):  
Yang Zhang ◽  
Wenxuan Yu ◽  
Youli Li ◽  
Han Li
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation ◽  
Thermal Sensation ◽  
Side Wall ◽  
Air Pollutant ◽  
Indoor Thermal Comfort ◽  
Subjective Experiment ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
Indoor Comfort

In this article, a comparative study on the outdoor air pollutant prevention and indoor thermal comfort for different types of ventilation was carried out. Both objective experiment, subjective experiment and computational fluid dynamics (CFD) simulation were conducted to investigate the differences in air pollutant prevention and thermal comfort between four common ventilation methods, namely supplying on the ceiling and returning on the ceiling (SC-RC), supplying on the ceiling and returning on the side wall (SC-RSW), supplying on the side wall and returning on the ceiling (SSW-RC), and supplying on the side wall and returning on the side wall (SSW-RSW). Results show that SSW-RSW can provide the highest indoor air quality according to the indoor average PM2.5 concentration. Overall thermal sensation was introduced to evaluate the indoor comfort under the four ventilation methods. The voting results show that the indoor thermal comfort can be enhanced by 29–36% under SSW-RSW and SSW-RC. Therefore, SSW-RSW is more suitable for providing a healthy and comfortable indoor environment.

scholarly journals HVAC Ventilation Strategies: The Contribution for Thermal Comfort, Energy Efficiency, and Indoor Air Quality

2007 ◽  
Vol 2 (2) ◽  
pp. 131-150 ◽  
Author(s):  
Jatuwat Varodompun ◽  
Mojtaba Navvab
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Cfd Simulation ◽  
Indoor Environmental Quality ◽  
Ventilation Strategy ◽  
Jet Ventilation ◽  
Advantages And Disadvantages ◽  
Ventilation Strategies

In Heating Ventilating and Air Conditioning (HVAC) systems, ventilation strategies impact building energy consumption, occupants' thermal comfort and Indoor Air Quality (IAQ). Ventilation strategies such as Mixing Jet Ventilation (MJV), Displacement Ventilation (DV), and Impinging Jet Ventilation (IJV) are operated on the different principals. MJV relies on dilution, while DV and IJV rely on both dilution and stratification. Due to climatic variation, ventilation strategies must be operated under different cooling and heating load scenarios. Typically, each ventilation strategy controls the indoor environment through a single adequate flow rate with suitable supply parameters such as temperature, pollutant concentration, vapor, velocity, etc. Hence, the indoor thermal and IAQ condition are independently impacted. A room with excellent thermal condition is possible to have poor IAQ. Given this limitation, vast air flow variables, and occupants' activities, the performances evaluation of these strategies are complicated. In this study, three ventilation strategies, MJV, DV, and IJV are thoroughly investigated. The Computational Fluid Dynamics (CFD) simulation was mainly utilized to handle the complexity of this study. The parametric studies of 48 CFD simulations are presented. Referring to ASHRAE RP-1133, the experimental data from a specially built HVAC-IEQ laboratory was used to validate the CFD data. The research results indicate both advantages and disadvantages in all three strategies. In addition, there is no single strategy that can perform excellently in all indexes. Using the well-known index called ventilation effectiveness (VEF), DV performs outstandingly. However, under a newly proposed index called ventilation performances, DV fails because the stratification discomfort exceeds 36% of room area. MJV suffers from low VEF and excessive draft. However, the IAQ of MJV is not as poor as expected. IJV can be an alternative especially for space where sleeping and sitting activities dominate. IJV can conserve HVAC energy, while maintaining good IAQ. Compared to DV, although VEF is lower, stratification discomfort is minimized to 24%–12% (depending on supply velocity). Overall, this study demonstrates that ventilation strategies are the key to enhance IAQ. Therefore, the utilization of an appropriate ventilation strategy might increase, Leadership in Energy and Environmental Design (LEED) score, particularly for Indoor Environmental Quality, Innovation and Design Process, and Energy and Atmospheric categories.

A FLUIDODINÂMICA COMPUTACIONAL UTILIZADA PARA MAPEAR O CONFORTO TÉRMICO DE SUÍNOS NA FASE DE MATERNIDADE

2017 ◽  
Vol 32 (1) ◽  
pp. 32
Author(s):  
Beatriz Kenickel Nunes ◽  
Silvia Regina Lucas de Souza ◽  
Arilson José de Oliveira Júnior ◽  
Enedy Allan Rodrigues Cordeiro ◽  
Reginaldo Apolinário de Almeida
Keyword(s):  
Thermal Comfort ◽  
Computational Fluid Dynamic ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Thermal Conditions ◽  
Simulation Software ◽  
Santa Cruz ◽  
Facilities Design ◽  
Comfort Condition ◽  
Made In

As observações geradas em estudos sobre instalações de suínos têm demonstrado que o desempenho térmico das instalações comumente utilizadas pelos produtores vem apresentando um quadro de desconforto térmico na fase da maternidade, devido às adaptações construtivas feitas com a finalidade de atender tanto as necessidades da matriz quanto dos leitões. Sendo assim, o objetivo deste trabalho foi utilizar a ferramenta de fluidodinâmica computacional (CFD) para realizar o mapeamento do microambiente de duas instalações de suínos, visando o bem-estar dos animais. As simulações foram obtidas em uma maternidade da Fazenda Experimental Lageado, UNESP, Botucatu/SP e de uma granja comercial localizada em Santa Cruz do Rio Pardo/SP. Para as simulações utilizou-se o software Autodesk® CFD Simulation juntamente com o AutoCAD 3D, para desenho das instalações. As condições de conforto térmico foram analisadas por meio da aplicação do índice de voto médio estimado – PMV. Na instalação comercial simulada observou-se que as aberturas laterais não são suficientes para manter uma condição de conforto térmico, segundo o índice PMV. Com o uso da fluidodinâmica computacional foi possível modificar o ambiente mediante a elevação do seu fluxo de ar, o que demonstrou ser uma solução na diminuição da temperatura do ar e alcance de uma condição de conforto térmico.PALAVRAS-CHAVE: Conforto térmico, bem-estar de suínos, fluidodinâmica computacional, CFD, simuladores. FLUIDODYNAMICS COMPUTATIONAL USED FOR THE MAPPING OF THERMAL CONDITIONS IN INSTALLATION OF SWINE MATERNITIESABSTRACT: Studies have shown that the thermal performance of facilities commonly used by producers has presented an environmental discomfort picture in the maternity phase due to constructive adjustments made in order to meet needs of both piglets and sow. Therefore, this work aimed to use the computational fluid dynamic tool for mapping the microclimate of two facilities, which purpose of improving the animal welfare. The simulations were conducted at experimental farm “Lageado”, UNESP, Botucatu/SP and a commercial facility, located in Santa Cruz do Rio Pardo/SP. For simulations were used the Autodesk® CFD Simulation software along with AutoCAD 3D (facilities design). Thermal comfort conditions were analyzed by means of predicted mean vote – PMV. In simulated commercial facility was observed that side vents are not sufficient to establish a thermal comfort condition, according to PMV. With computational fluid dynamic was possible to change the environment through air flow increase, showing to be a solution in decrease of air temperature and reach of thermal comfort condition.KEYWORDS: Thermal comfort, swine welfare, computational fluid dynamic, CFD, simulators.

CFD SIMULATION OF THERMAL COMFORT USING INDIVIDUALIZED AIR CONDITIONING SYSTEMS

2015 ◽  
Author(s):  
Rafael Prata Ritzinger ◽  
Nathane Ventura de Miranda ◽  
Álvaro M. Bigonha Tibiriçá ◽  
Alexandre Navarro da Silva ◽  
Henrique Márcio Pereira Rosa ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Air Conditioning Systems

scholarly journals Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

2013 ◽  
Vol 70 ◽  
pp. 73-89 ◽  
Author(s):  
Magdalena Hajdukiewicz ◽  
Marco Geron ◽  
Marcus M. Keane
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation

Numerical Investigation on Ventilation Strategy for Laboratories: An Approach to Control Thermal Comfort and Air Quality Using Active Chilled Beams

2007 ◽  
Author(s):  
Farhad Memarzadeh ◽  
Jane Jiang ◽  
Andy Manning
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Flow Rate ◽  
Cfd Simulation ◽  
Washington Dc ◽  
Ventilation Strategy ◽  
Flow Rates ◽  
Beam System ◽  
Computational Fluid Dynamics Cfd ◽  
Lower Flow Rate

Laboratories are usually equipment intensive. The supply flow rates required to cool these laboratories are generally higher than in a less equipment intensive zone of the building. The thermal comfort of occupants in laboratories can be controlled by the choice of ventilation strategy. This study employs Computational Fluid Dynamics (CFD) simulation to assess the performance of active chilled beams in a general laboratory layout with some equipment intensive areas and the removal effectiveness of such a system. The chilled beam performance is also compared with at of ceiling diffusers. The results from this study show that the chilled beams improve thermal comfort, and they can be operated at as low as 4 ACH while maintaining very satisfactory average PPD (around 10%) in the occupied zones. The chilled beam system also improves removal effectiveness because of the inherent higher total supply flow rate that results in a better mixing in the room than ceiling diffusers. The chilled beams in the cases studied are seen to have an insignificant effect on the hood containment. As satisfactory thermal comfort and air quality can be achieved at a lower flow rate in comparison with all-air ceiling diffusers, a 14% saving is estimated in annual energy cost for cooling and ventilating a typical lab in the Washington DC area.

scholarly journals Investigation on the Thermal Condition of a Traditional Cold-Lane in Summer in Subtropical Humid Climate Region of China

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6602
Author(s):  
Hui Chen ◽  
Yin Wei ◽  
Yaolin Lin ◽  
Wei Yang ◽  
Xiaoming Chen ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Thermal Comfort ◽  
Heat Dissipation ◽  
Cfd Simulation ◽  
Sensible Heat ◽  
Small Aspect Ratio ◽  
Humid Climate ◽  
Shading Effect ◽  
Climate Conditions ◽  
Computational Flow Dynamics

A Chinese traditional narrow street, named Cold-Lane, can create a microclimatic zone that provides pedestrian thermal comfort under hot and humid climate conditions. This phenomenon was observed through experimental measurement during the summer of 2016. The heat transfer rate over the pedestrian body surface was calculated to reveal why pedestrians experience a cool sensation, and computational flow dynamics (CFD) simulation was carried out to study the influence of the street aspect ratio on the shading effect. It was found that the perception of thermal comfort can be attributed mainly to the radiation between the relatively cool surrounding walls and the human body, and the wind velocity has little effect on sensible heat dissipation. The cool horizontal and vertical surfaces in the street canyon are mainly due to the shading effect as a result of the small aspect ratio, which is a typical characteristic of the traditional Chinese street. The shading effect of the high walls on both sides creates the cooling effect of this narrow street.

scholarly journals Ventilation Characteristics and Performance Evaluation of Different Window-Opening Forms in a Typical Office Room

2021 ◽  
Vol 11 (19) ◽  
pp. 8966
Author(s):  
Yuanyuan Wang ◽  
Yanzhe Yu ◽  
Tianzhen Ye ◽  
Quan Bo
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Thermal Sensation ◽  
Ventilation Rate ◽  
Window Opening ◽  
Ventilation Modes ◽  
Ventilation Performance ◽  
Scale Experiment ◽  
And Performance

As most existing office buildings in China lack fresh air systems for ventilation, natural ventilation with windows remains the main means of improving indoor air quality and adjusting indoor thermal comfort. However, knowledge of the ventilation characteristics of various window-opening forms in actual buildings is limited and current methods for evaluating ventilation performance lack a comprehensive consideration of ventilation rate and thermal comfort. In this study, the ventilation characteristics of different window-opening forms were systematically compared by conducting computational fluid dynamics (CFD) simulations. A full-scale experiment was conducted in a typical office room in a university in Tianjin to validate the CFD simulation. Two ventilation modes (wind-driven cross-ventilation and temperature-driven single-sided ventilation), three window-opening angles, and seven window types were investigated. Additionally, the ratio of the ventilation rate to the absolute value of thermal sensation was used to quantify the indoor natural-ventilation performance. The results showed that a sliding window with a full opening has the highest discharge coefficients of 0.68 and 0.52 under wind-driven cross-ventilation and temperature-driven single-sided ventilation, respectively, and top-hung windows opening both inwards and outwards have better ventilation performance than other window types under the two ventilation modes. This study is applicable to the design and practice of natural ventilation.

scholarly journals Study on the Performance of Adjustable Platform Screen Door in Subway Stations

2020 ◽  
Vol 172 ◽  
pp. 24008
Author(s):  
Su Ziyi ◽  
Li Xiaofeng ◽  
Zhang Yue
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation ◽  
Rapid Progress ◽  
Comfort Zone ◽  
Thermal Discomfort ◽  
Warmth Index ◽  
Computational Fluid Dynamics Cfd ◽  
Subway Stations ◽  
Arrival Pattern ◽  
Occupied Zone

In the last decades, the construction of subway systems has been in rapid progress in metropolis. Former studies have pointed out that substantial amount of energy is consumed by subway stations. Thus, the adjustable platform screen door (APSD) system is widely adopted, which is characterized by the energy-saving in both the cooling season and the transitional season. However, the installation of APSD system might result in thermal discomfort for passengers, which lacks investigation. This study aims to study the performance on the thermal comfort of subway station with APSD system. In this process, Computational Fluid Dynamics (CFD) Simulation was conducted using PHOENICS to obtain the velocity and temperature distribution under 3 kinds of train arrival patterns. Furthermore, Relative Warmth Index (RWI) was used to assess thermal comfort. The results show that the velocities of the platform and station hall are below 2.5m/s and 3.7m/s respectively, which is closely related to the train arrival pattern. With regard to the platform occupied zone, the RWI is between 0.04 to 0.19, which is almost within the thermal comfort zone according to the ASHRAE comfort classification. Nevertheless, for the occupied zone of the hall, the RWI is between 0.15 to 0.52, indicating relatively warm.

The CFD Simulation on Thermal Comfort in a library Building in the Tropics

2010 ◽  
Author(s):  
Y. H. Yau ◽  
N. N. N. Ghazali ◽  
A. Badarudin ◽  
F. C. Goh ◽  
Jane W. Z. Lu ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation ◽  
The Tropics
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