The Aerodynamics Simulation of Air Ventilation Performance and the Process Development of Air Ventilation Design Tool

2004 ◽  
Author(s):  
Se-Gil Park ◽  
Jin-Bok Kim ◽  
Sung-ho Song ◽  
Jang-hyung Cho
Keyword(s):  
Process Development ◽  
Design Tool ◽  
Air Ventilation ◽  
Ventilation Performance

scholarly journals Air Ventilation Performance of School Classrooms with Respect to the Installation Positions of Return Duct

2021 ◽  
Vol 13 (11) ◽  
pp. 6188
Author(s):  
Sungwan Son ◽  
Choon-Man Jang
Keyword(s):  
Air Quality ◽  
Numerical Analysis ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Three Dimensional ◽  
Cross Infection ◽  
School Students ◽  
Height Range ◽  
Air Ventilation ◽  
Ventilation Performance

For students, who spend most of their time in school classrooms, it is important to maintain indoor air quality (IAQ) to ensure a comfortable and healthy life. Recently, the ventilation performance for indoor air quality in elementary schools has emerged as an important social issue due to the increase in the number of days of continuous high concentrations of particulate matter. Three-dimensional numerical analysis has been introduced to evaluate the indoor airflow according to the installation location of return diffusers. Considering the possibility of the cross-infection of infectious diseases between students due to the direction of airflow in the classroom, the airflow angles of the average respiratory height range of elementary school students, between 1.0 and 1.5 m, are analyzed. Throughout the numerical analysis inside the classroom, it is found that the floor return system reduces the indoor horizontal airflow that causes cross-infection among students by 20% compared to the upper return systems. Air ventilation performance is also analyzed in detail using the results of numerical simulation, including streamlines, temperature and the age of air.

Virtual 3D Model Simulation for Design and Implementation of Automated Processes

2010 ◽  
Author(s):  
Richard Y. Chiou ◽  
Yongjin James Kwon ◽  
Sang C. Park ◽  
Robin Kizirian ◽  
Yueh-Ting Yang ◽  
...  
Keyword(s):  
Process Development ◽  
Production Systems ◽  
Model Simulation ◽  
Substantial Reduction ◽  
Systems Design ◽  
Design Tool ◽  
Test Environment ◽  
Physical Test ◽  
Simulation Tools ◽  
Automated Processes

This paper presents the integration and implementation of automated processes, based on the sequence control specifications and requirements of PLC (Programmable Logic Controller) systems to create a virtual test environment using a software simulation tool, PLCStudio. In order to meet the demands of the new manufacturing paradigm, PLCStudio is being designed as a next generation tool for digital production. This production solution set represents an integrated suite that provides manufacturing process design, tool and fixture design, factory and production systems design, visualization, and automation through 3D virtual simulation tools. The significant effect and benefit for the manufacturer from such a suite of tools would be a substantial reduction to the manufacturing lifecycle. This includes reduction of the assembly time and cut-down on the cost for a process development through the virtual validation and commissioning of production systems. In this paper, a process with quantifiable goals and efficiencies utilizing a robot and other devices is developed. PLCStudio is used to model the process. PLC logic control is developed to control the system and tested virtually using PLCStudio before it is used in a full scale physical test.

Development and trial of athletic T-shirt using spacer blocks to enhance ventilation

2017 ◽  
Vol 29 (5) ◽  
pp. 706-715
Author(s):  
Chu Po Ho ◽  
Jintu Fan ◽  
Edward Newton ◽  
Raymond Au
Keyword(s):  
Skin Surface ◽  
Air Gap ◽  
Comfort Level ◽  
Treadmill Running ◽  
Thermal Manikin ◽  
Design Development ◽  
Content Type ◽  
Air Ventilation ◽  
Ventilation Performance ◽  
Moisture Vapour

Purpose In previous studies, enlarging the air gap between fabric and the skin through the placement of spacer blocks has been proven to improve air ventilation, particularly when the pumping effect is activated during movement. These studies evaluated only the total thermal insulation (Rt) and moisture vapour resistance (Ret) by using a fabric thermal manikin. The purpose of this paper is to report the experience, perceived comfort level, and ventilation effect of two designed T-shirts in a wearer trial. Design/methodology/approach An athletic T-shirt (Vented Design) was designed by attaching spacer blocks to the underside of the fabric to enlarge the air gap. Eight subjects participated in the wearer trial, which comprised 30 min treadmill running, followed by 10 min of rest. At different points during the 40 min test period, subjects rated their body coolness, skin dryness, and overall comfort of the designed T-shirt. The testing was repeated with participants wearing the same T-shirt but without spacer blocks, which served as a control garment. The mean skin temperature of each subject was also measured to support survey findings. Findings The data were evaluated using independent t-tests. The T-shirt with spacer blocks provided higher ventilation than the control T-shirt after 10 min of running. Research limitations – because of limited resources, only eight subjects were recruited to this study. In addition, more T-shirt designs should be tested in the future to elucidate how T-shirt design affects ventilation performance. Originality/value This study investigated a T-shirt design wherein the air gap between the skin surface and fabric was increased. The results of the wearer trial showed that this design could be adopted as a design brief for further design development of related clothing. This study has implications for clothing designers developing functional clothing with improved ventilation.

Analysis of Natural Ventilation Efficiency of a Passive Solar Chimney in a Conference Hall of the Magic School of Green Technology

2013 ◽  
Vol 368-370 ◽  
pp. 603-606 ◽  
Author(s):  
Chun Han Chien ◽  
Hsien Te Lin
Keyword(s):  
Natural Ventilation ◽  
Ventilation Rate ◽  
Green Technology ◽  
Solar Chimney ◽  
Air Exchange Rate ◽  
Ventilation Efficiency ◽  
Air Ventilation ◽  
Passive Solar ◽  
Ventilation Performance ◽  
Air Exchange

This study focuses on the efficiency of passive solar chimney in natural ventilation performance of the conference hall at the Magic School of Green Technology (MSGT) in Tainan, Taiwan. The air exchange rate in the conference hall was between 5.73 ACH and 9.11 ACH, which exceeded the minimum air ventilation rate required in Taiwan. This shows that a passive solar chimney can effectively applied to the conference hall to meet indoor ventilation and air exchange requirements without using air conditioning.

scholarly journals Developing the Inclusive Course Design Tool: a tool to support staff reflection on their inclusive practice

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Susan Virginia Smith ◽  
Ruth Pickford ◽  
Janice Priestley ◽  
Rebecca Sellers
Keyword(s):  
Course Design ◽  
Process Development ◽  
Universal Design For Learning ◽  
Design Tool ◽  
Unconscious Bias ◽  
Consultation Process ◽  
Academic Practice ◽  
Early Evaluation ◽  
Inclusive Practice ◽  
Design For Learning

Inclusivity is fundamental to higher education, its course design, its assessment and its delivery. The principles of inclusivity offer all students the opportunities to achieve to the best of their ability. The purpose of this case-study is to outline the context, process, development and initial evaluation of a newly generated tool designed for academic colleagues. The Inclusive Course Design Tool (ICDT) offers a series of questions for reflection with supporting guidance rooted in theory and research on inclusion, pedagogy, multiculturalism, universal design for learning and implicit and unconscious bias. This first version of the tool encourages course teams to reflect on and interrogate the nature of inclusive academic practice in their courses, in their course curricula, their classrooms (virtual or physical) and their approaches to student learning and support. The contextualised rationale for the tool, its design, the consultation process, its early evaluation and future considerations as an institutional tool are explored. This paper specifically explores its use to try to reduce the black, asian and minority ethnic (BAME) student award gap and enhance success and graduate outcomes, as well as academic practice and staff reflection.

scholarly journals Experimental assessment of different mixing air ventilation systems on ventilation performance and exposure to exhaled contaminants in hospital rooms

2018 ◽  
Vol 177 ◽  
pp. 207-219 ◽  
Author(s):  
F.A. Berlanga ◽  
I. Olmedo ◽  
M. Ruiz de Adana ◽  
J.M. Villafruela ◽  
J.F. San José ◽  
...  
Keyword(s):  
Experimental Assessment ◽  
Air Ventilation ◽  
Ventilation Performance ◽  
Ventilation Systems

scholarly journals Proposal of a New Method for Controlling the Thaw of Permafrost around the China–Russia Crude Oil Pipeline and a Preliminary Study of Its Ventilation Capacity

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2908
Author(s):  
Yapeng Cao ◽  
Guoyu Li ◽  
Gang Wu ◽  
Dun Chen ◽  
Kai Gao ◽  
...  
Keyword(s):  
Crude Oil ◽  
Natural Ventilation ◽  
Control Method ◽  
Oil Pipeline ◽  
Novel Structure ◽  
Oil Pipelines ◽  
Air Ventilation ◽  
Resistance Loss ◽  
Ventilation Performance ◽  
The Relationship

The China–Russia crude oil pipeline (CRCOP) has been in operation for over ten years. Field observation results have shown that a thaw bulb has developed around the CRCOP which expands at a rate of more than 0.8 m∙a−1 in depth. In view of the deficits of existing measures in mitigating permafrost thaw, a new control method is proposed based on active cooling. According to the relationship between total pressure loss and the driving force of natural ventilation, the wind speed in a U-shaped air-ventilation pipe around the CRCOP is calculated. By analyzing the theoretical calculation and numerical analysis results, it is found that the influence of thermal pressure difference on the natural ventilation of the structure can be negligible, and the influences of resistance loss along the pipe and local resistance loss in the pipe are similarly negligible. Exhaust elbows greatly improve the ventilation performance of the U-shaped air-ventilated pipe. This study developed a novel structure around warm-oil pipelines in permafrost for mitigating thaw settlement along the CRCOP and other similar projects across the world.

Advanced TEM sample preparation techniques for submicron Si devices

1995 ◽  
Vol 53 ◽  
pp. 516-517 ◽  
Author(s):  
P. B. Basham ◽  
H. L. Tsai
Keyword(s):  
Sample Preparation ◽  
Process Development ◽  
Light Transmission ◽  
Specific Area ◽  
Turnaround Time ◽  
Small Hole ◽  
Area Of Interest ◽  
Transmission Electron ◽  
Polished Side ◽  
Preparation Techniques

The use of transmission electron microscopy (TEM) to support process development of advanced microelectronic devices is often challenged by a large amount of samples submitted from wafer fabrication areas and specific-spot analysis. Improving the TEM sample preparation techniques for a fast turnaround time is critical in order to provide a timely support for customers and improve the utilization of TEM. For the specific-area sample preparation, a technique which can be easily prepared with the least amount of effort is preferred. For these reasons, we have developed several techniques which have greatly facilitated the TEM sample preparation.For specific-area analysis, the use of a copper grid with a small hole is found to be very useful. With this small-hole grid technique, TEM sample preparation can be proceeded by well-established conventional methods. The sample is first polished to the area of interest, which is then carefully positioned inside the hole. This polished side is placed against the grid by epoxy Fig. 1 is an optical image of a TEM cross-section after dimpling to light transmission.

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