Effects of different types of entrances on natural ventilation in a subway station

2020 ◽  
Vol 105 ◽  
pp. 103578 ◽  
Author(s):  
Yanan Liu ◽  
Yuxiang Hu ◽  
Yimin Xiao ◽  
Jianli Chen ◽  
Haotian Huang
Keyword(s):  
Natural Ventilation ◽  
Subway Station ◽  
Different Types

From Construction to Operation: Achieving Indoor Thermal Comfort via Altering External Walls Specifications in Egypt

2013 ◽  
Vol 689 ◽  
pp. 250-253 ◽  
Author(s):  
Mohamed M. Mahdy ◽  
Marialena Nikolopoulou
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Natural Ventilation ◽  
Minimum Energy ◽  
Residential Energy ◽  
Indoor Thermal Comfort ◽  
Minimum Energy Consumption ◽  
Different Types ◽  
Running Cost ◽  
The Cost

The objective of this research is to study the effect of using different material specifications for the external walls on the cost of the energy consumption for achieving internal thermal comfort. We refer to this as operation running cost, which in turn is compared to initial construction cost for each type of the used external walls. In order to achieve this objective, dynamic thermal simulation were carried out for four different types of external walls – commonly used in Egypt – in two different sets of cooling: natural ventilation and mechanical means. Experiments recommend that using the Egyptian Residential Energy Code (EREC) to achieve inner thermal comfort with the minimum energy consumption (consequently the minimum CO2 emissions) and the minimum running cost as well.

A new natural ventilation method for fire-induced smoke control in a common subway station

2017 ◽  
Vol 17 (2) ◽  
pp. 63-80 ◽  
Author(s):  
Fan Wu ◽  
Juncheng Jiang ◽  
Ru Zhou ◽  
Dong Zhao ◽  
Langjun Shi
Keyword(s):  
Natural Ventilation ◽  
Subway Station ◽  
Smoke Control ◽  
Ventilation Method

scholarly journals Research on the Microclimate of Protected Agriculture Structures Using Numerical Simulation Tools: A Technical and Bibliometric Analysis as a Contribution to the Sustainability of Under-Cover Cropping in Tropical and Subtropical Countries

2021 ◽  
Vol 13 (18) ◽  
pp. 10433
Author(s):  
Gloria Alexandra Ortiz Rocha ◽  
Maria Angelica Pichimata ◽  
Edwin Villagran
Keyword(s):  
Numerical Simulation ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Technical Information ◽  
Scientific Production ◽  
Future Research ◽  
Climate Control ◽  
Climate Conditions ◽  
Different Types ◽  
Search For Information

The use of protected agriculture structures in tropical and subtropical countries is the main alternative for intensification of agricultural production selected by producers. In general, in these regions, passive and plastic-covered structures predominate, with natural ventilation as the only method of climate control. This phenomenon has been widely studied in different types of structures using computational fluid dynamics (CFD) simulation. Therefore, this review aimed to collect and analyze the publications generated in this field of knowledge between 2010 and 2020. The search for information included the main academic databases available on the web and the analysis was carried out using bibliometric techniques, from which it was possible to identify details inherent to the scientific production, such as countries of origin, main authors, journals, and citations. Likewise, a detailed breakdown of the relevant technical information of the three phases of numerical simulation, such as preprocessing, processing, and postprocessing, was carried out. A compilation of 118 papers published in 65 journals, written by 256 authors, originating from 24 countries was achieved, where it was evident that Mexico and Colombia were the countries with the highest scientific production in the last decade. These papers analyzed, together, a total of 17 different types of structures where polyethylene-covered greenhouses predominated, with steady state simulations, for daytime climate conditions and without the presence of crops. Within the current and future research trends, the predominance of studies analyzing passive climate control methods, new models of insect-proof mesh-house structures, and, finally, studies focused on the structural analysis of greenhouses was found.

scholarly journals Experimental Methods of Investigating Airborne Indoor Virus-Transmissions Adapted to Several Ventilation Measures

2022 ◽  
Author(s):  
Lukas Siebler ◽  
Maurizio Calandri ◽  
Torben Rathje ◽  
Konstantinos Stergiaropoulos
Keyword(s):  
Natural Ventilation ◽  
Particle Method ◽  
Experimental Methods ◽  
Infection Risk ◽  
Trace Gas ◽  
Accurate Assessment ◽  
Outdoor Air ◽  
Different Types ◽  
Set Up ◽  
First Time

This study introduces a principle, which unifies two experimental methods for airborne indoor virus-transmissions adapted to several ventilation measures. A first-time comparison of mechanical/natural ventilation and air purifiers with regard to infection risks is achieved. Effortful computational fluid dynamics demand detailed boundary conditions for accurate calculations of indoor airflows, which are often unknown. Hence a suitable, simple and generalized experimental set up for identifying the spatial and temporal infection risk for different ventilation measures is required. A trace gas method is suitable for mechanical and natural ventilation with outdoor air exchange. For an accurate assessment of air purifiers based on filtration a surrogate particle method is appropriate. The release of a controlled rate of either trace gas or particles simulates an infectious person releasing virus material. Surrounding substance concentration measurements identify the neighborhood exposure. One key aspect of the study is to prove that the requirement of concordant results of both methods is fulfilled. This is the only way to ensure that the comparison of different ventilation measures described above is reliable. Two examples (a two person office, several classrooms) show how practical both methods are and how the principle is applicable for different types and sizes of rooms.

scholarly journals FUNCTIONALISM OF WIND RENEWABLE ENERGY IN VERNACULAR ELEMENTS OF WIND CATCHER AND MOSHABAK (CASE STUDY: QESHM ISLAND)

2020 ◽  
pp. 161-172
Author(s):  
Mahdieh Pazhouhanfar ◽  
Hamed Mohammadi Mazraeh
Keyword(s):  
Renewable Energy ◽  
Research Methodology ◽  
Natural Ventilation ◽  
Vernacular Architecture ◽  
Qualitative Approach ◽  
Qeshm Island ◽  
Architectural Elements ◽  
Different Types ◽  
Functional Art

Qeshm, an island in southern Iran, has two significant elements of sustainable architecture—wind catcher and Latticework (Moshabak). So, it can be defined based on its performance-oriented vernacular architecture which results in the wind renewable energy. However, there are few studies on these sustainable elements. The present study attempted to analyze the performance and structure of these natural ventilation systems in the island. In our research methodology, we tried to use the qualitative approach. Initially, we used citation and library sources for gathering information. Later, we visited the site and the native architecture of the island was studied by analyzing and extracting architectural elements from 48 old buildings which are over 70 years old. Moreover, different types of wind energy and Moshabaks used in the island were thoroughly studied. Meanwhile, the temperature during different periods was compared and the height of the wind catchers and their influence on the rate of wind deflector, functional art, and ecology-oriented architecture of the island were evaluated. The results showed that in terms of function, these so-called sustainable native architectural elements have met the natural ventilation requirement appropriately.

scholarly journals Effect of Different Types of Middle Columns on the Seismic Performance of Single-Story Subway Station Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Sheng Li ◽  
Haiyang Zhuang ◽  
Wei Wang ◽  
Liguo Jin ◽  
Zhengfang Dong
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Underground Structure ◽  
Steel Tube ◽  
Subway Station ◽  
Structural Function ◽  
Analysis Model ◽  
Different Types ◽  
Cfst Columns ◽  
Station Structure

In view of the seismic weak component of the single-frame-type subway station structure, the three-dimensional (3D) time-domain nonlinear finite element static-dynamic coupling analysis model of interaction between soil and subway station structure is established by, respectively, using rectangular reinforced concrete (RRC) columns, circular reinforced concrete (CRC) columns, and prefabricated concrete-filled steel tube (CFST) columns with a quick-connection device proposed in this article. This analysis model is further used to investigate the influence of different types of middle columns on the seismic response characteristics of the underground structure, such as the interstory displacement angle, seismic damage, and dynamic response. The results show that, compared with the rectangular columns, the circular columns with the equal moment of inertia suffer less damage in the earthquake and have better seismic performance. The prefabricated CFST columns can effectively ensure that the middle columns of the station structure are not severely damaged and can be replaced quickly after the earthquake, which improves the overall seismic performance of the subway station structure and the rapid recovery ability of the structural function after the earthquake.

Numerical Simulation and Analysis of the Two-Sided Windcatcher Inlet\Outlet Effect on Ventilation Flow Through a Three Dimensional Room

2014 ◽  
Author(s):  
Amirreza Niktash ◽  
B. P. Huynh
Keyword(s):  
Flow Velocity ◽  
Flow Pattern ◽  
Natural Ventilation ◽  
Three Dimensional ◽  
Interior Space ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Through ◽  
Cfd Method ◽  
Living Area

A windcatcher is a structure placed on the roof of a building for providing natural ventilation for interior space working by wind power. It draws out the inside stale air to the outside and supplies the outside fresh air for the building’s interior space. In this paper, the effect of different types of windcatcher’s inlet\outlet on the air flow, flow velocity and flowrate through a three-dimensional room fitted with a two-sided windcatcher is observed numerically, using a commercial computational fluid dynamics (CFD) software package. The standard RANS K-ε CFD method is used in the simulations. The flow pattern, flow velocity and flowrate of the inside ventilation flow is considered for the six different types of a two-sided windcatcher’s inlet\outlet. It is found that the shape of the inlet\outlet of windcatcher strongly affects flow pattern, flow velocity and flowrate and the performance of square windcatcher is higher than the circular one specially in ventilating the living area (lower part) of a room.

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