Modeling air exchange in office premises using a microperforated fabric air duct

2021 ◽  
pp. 52-57
Author(s):  
В.В. Агафонова ◽  
А.П. Скибин ◽  
В.Ю. Волков
Keyword(s):  
Study Data ◽  
Office Building ◽  
Air Distribution ◽  
Optimal Parameters ◽  
Working Space ◽  
Air Supply ◽  
Air Dispersion ◽  
Air Speed ◽  
Air Exchange

Рассмотрены вопросы улучшения качества внутренней среды помещения офисного здания при применении современного воздухораспределительного устройства – текстильного воздуховода с микроотверстиями. Преимуществом такого вида устройств является подача приточного воздуха струями с малым импульсом, что позволяет размещать их вблизи рабочей зоны помещения, исключая возможность возникновения сквозняков на рабочих местах. Цель работы – сопоставительный численный расчет эффективности организации воздухообмена в помещении офисного здания при двух схемах подачи воздуха: через приточные решетки и посредством текстильного воздуховода с микроперфорацией. Моделирование проводилось с использованием коммерческого программного комплекса STAR-CCM+. Для описания движения воздуха используется система уравнений Рейнольдса с замыканием с помощью модели турбулентности k-ω SST (Mentor). В ходе проведения исследований были получены данные о характере изменения температуры и скорости воздуха по высоте рабочей зоны помещения. Определено, что при подаче воздуха через приточные решетки температура (23,3–27,2 °С) и скорость воздуха (0,06–0,22 м/с) соответствуют допустимым параметрам микроклимата (ГОСТ 30494-2011), при организации воздухообмена с помощью микроперфорированного воздуховода – оптимальным параметрам (температура 23,1–25,4 °С, скорость воздуха 0,09–0,13 м/с), комфортным для организма человека. Таким образом, применение воздуховода с микроперфорацией повышает эффективность ассимиляции тепловых избытков по сравнению с традиционными воздухораспределительными устройствами (вентиляционными решетками). The issues of improving the quality of the internal environment of an office building using an advanced air dispersion device – a fabric air duct with micro-orifices are considered. The advantage of this device is supplying the incoming air by jets with a low impulse allowing to locate the devices near the working space in offices eliminating the risk of drafts at the working places. The purpose of the work is a comparative numerical calculation of the efficiency of arranging the air exchange in an office building with two air supply schemes: through supply grilles and through a fabric air duct with microperforation. Modeling was carried out using the commercial STAR-CCM + software package. The system of Reynolds equations with closure using the k-ωSST turbulence model (Mentor) is used to describe the air movement. As part of the study, data on the nature of the change in temperature and air speed along the height of the working area of the office were obtained. It has been determined that while air is supplied through the supply grilles, the temperature (23.3–27.2 °C) and air speed (0.06–0.22 m/s) meet the permissible microclimate standards (GOST 30494-2011); while arranging the air exchange with the use of a microperforated air duct they correspond to the optimal parameters (temperature 23.1–25.4 °С, air speed 0.09–0.13 m/s) that are comfortable for the human body. Thus, the use of a microperforated air duct enhances the efficiency of heat surplus assimilation in comparison with traditional air distribution devices (ventilation grilles).

scholarly journals TEMPAT PETUALANGAN KULINER DI STASIUN PESING

2020 ◽  
Vol 2 (1) ◽  
pp. 541
Author(s):  
Evan Hansabian ◽  
Martin Halim
Keyword(s):  
Traffic Congestion ◽  
Social Life ◽  
Phenomenological Approach ◽  
Daily Basis ◽  
Office Building ◽  
Local Foods ◽  
Train Station ◽  
Traffic Jams ◽  
Working Space

A thirdplace is very important on our daily basis, where the firstplace is a dwelling we live in, the secondplace is where we work to earn a living, and what about the thirdplace? This is what will be brought up by an architect of how do we scheme a thirdplace for others to create a good quality. With a phenomenological approach, many things must be considered in detail because the number of places to eat at Pesing Station are lack, unclean, and unintegrated, that made the visitors less enjoying this area. Unconsciously in it has a memory of historical value about local culinary that has faded in Jakarta and completed by some supportive local activities such as outdoor theater, pedestrian mall, local typical cafes, and local desserts, to raise the culture and habits of people in Indonesia. Since the location is close to the train station, co-working space become an additional program in this culinary place, where people who wants to work do not need to rent an office building. With a few simple eating places, they are quite convinient to find food and other entertainment facilities. There are online motorcycle taxis operating in front of Ibis hotel but hamper the traffic lanes and cause traffic jams, so the foodstreet will be a resting place for station visitors, and both online and offline motorcycle taxis to avoid disrupting the traffic. The presence of this food adventure place in Pesing Station is expected to improve the quality of social life in the environment around us, minimize the traffic congestion in front of the station, adding some knowledge about local foods, and be a thirdplace in Grogol Petamburan area. AbstrakTempat ketiga itu sangat penting bagi kehidupan manusia, dimana tempat pertama adalah rumah yang kita tinggali sehari-hari, tempat kedua adalah dimana kita bekerja untuk mendapatkan penghasilan, bagaimana dengan tempat ketiga? Ini yang akan diangkat oleh seorang arsitek, bagaimana cara merancang sebuah tempat ketiga bagi orang-orang sekitar agar bisa menciptakan kualitas yang baik. Dengan pendekatan fenomenologi, banyak hal yang harus diperhatikan secara detail, karena tempat makan di stasiun pesing jumlahnya sangat kurang, tidak bersih, dan tidak terintegrasi, sehingga membuat pengunjung sekitar kurang menikmati daerah tersebut. Secara tidak sadar di dalamnya terdapat sebuah memori pemberi nilai sejarah tentang kuliner nusantara yang sudah memudar di Jakarta dan di lengkapi dengan aktivitas-aktivitas lokal pendukung lainya seperti theater outdoor, pedestrianmall, cafe khas nusantara, dan makanan penutup nusantara, kerena ingin mengangkat budaya dan kebiasaan masyarakat di indonesia. Karena lokasi yang dekat dengan stasiun kereta api, maka co-working space menjadi program tambahan di tempat kuliner ini, dimana orang yang ingin bekerja tidak perlu menyewa gedung perkantoran. dengan adanya beberapa tempat makan yang sederhana, mereka cukup mudah untuk mencari makan dan sarana hiburan lainya. Disana terdapat ojek online yang beroperasi di depan ibis hotel tetapi cukup menghambat jalur lalu lintas dan menimbulkan kemacetan, maka foodstreet menjadi tempat peristirahatan bagi pengunjung stasiun, ojek online, dan ojek pengkolan agar tidak mengganggu jalur lalu lintas. Dengan hadirnya tempat petualangan kuliner di stasiun Pesing ini diharapkan dapat meningkatkan interaksi sosial di lingkungan sehari-hari, dapat meminimalisir kemacetan yang ada di depan stasiun, menambah wawasan tentang kuliner nusantara dan menjadi tempat ketiga bagi wilayah Grogol petamburan.

scholarly journals Providers’ View on the First Kidney Transplantation Center in Ethiopia: Experience From Past to Present

2021 ◽  
Vol 8 ◽  
pp. 233339282110183
Author(s):  
Tariku Shimels ◽  
Abrham Getachew ◽  
Mekdim Tadesse ◽  
Alison Thompson
Keyword(s):  
Kidney Transplantation ◽  
Renal Transplant ◽  
Health Care Providers ◽  
Study Data ◽  
Care Providers ◽  
Transplant Center ◽  
Transplantation Center ◽  
Stage Renal Disease ◽  
End Stage

Introduction: Transplantation is the optimal management for patients with end-stage renal disease. In Ethiopia, the first national kidney transplantation center was opened at St. Paul’s Hospital Millennium Medical College in September 2015. The aim of this study was to explore providers’ views and experiences of the past to present at this center. Methods: A qualitative study design was employed from 1st November to 15th December, 2019. To ensure that appropriate informants would provide rich study data, 8 health care providers and top management members were purposefully chosen for in-depth interviews. A maximum variation sampling method was considered to include a representative sample of informants. Interviews were digitally audio-recorded, and transcribed verbatim. Transcribed data was coded and analyzed using Qualitative Data Analysis (QDA) Minor Lite software and Microsoft-Excel. Result: The participants (5 males and 3 females) approached were from different departments of the renal transplant center, and the main hospital. Eight main themes and 18 sub-themes were generated initially from all interviews totaling to 109 index codes. Further evaluation and recoding retained 5 main themes, and 14 sub-themes. The main themes are; challenges experienced during and after launching the center, commitment, sympathy and satisfaction, outcomes of renal transplant, actions to improve the quality of service, and how the transplant center should operate. Providers claim that they discharge their responsibilities through proper commitment and compassion, paying no attention to incentive packages. They also explained that renal transplantation would have all the outcomes related to economic, humanistic and clinical facets. Conclusion and Recommendation: A multitude of challenges were faced during and after the establishment of the first renal transplant center in Ethiopia. Providers discharge their responsibility through a proper compassion for patients. Concerned stakeholders should actively collaborate to improve the quality of renal transplant services in the center.

scholarly journals Geometric Measurements on a CNC Machining Device as an Element of Closed Door Technology

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4852
Author(s):  
Grzegorz Bomba ◽  
Artur Ornat ◽  
Piotr Gierlak
Keyword(s):  
Measurement System ◽  
Measurement Process ◽  
Cnc Machining ◽  
Measuring System ◽  
Cnc Machine ◽  
Statistical Process ◽  
Working Space ◽  
Closed Door ◽  
Accuracy And Repeatability

The article discusses the quality testing of a measuring system consisting of a CNC machine with measuring probes. The research was conducted in a broader context regarding the implementation of the closed door technology, i.e., production without human intervention, in an aviation plant manufacturing aircraft gearbox systems. This technology may involve automated measuring operations performed in machining centers, and not in measuring laboratories, provided that the quality of the measurements is appropriate. The aim of the study was to investigate whether the CNC machining device can be used to measure the geometric features of aircraft gearbox housing. For this purpose, measurement experiments were carried out with the use of three different probes. Measurements were carried out using four sequences of increasing complexity, so that, after error analysis, it was possible to find the causes of possible irregularities. A reference ring with known dimensions and position in the working space of the machine was used for the measurements performed as part of the assessment of the measurement system. The quality of the measurements was evaluated with the use of repeatability and reproducibility testing and statistical process control. The analysis results showed that the tested measurement system ensures adequate accuracy and repeatability, and the measurement process is characterized with adequate efficiency in relation to the manufacturing tolerance of the components produced using the machine. Thus, it was proven that the measurement process can be carried out on a machining device, which enables its integration into the closed door technology.

scholarly journals Preschool teachers and caregivers’ lack of repositioning in response to changed responsibilities in policy documents

2021 ◽  
pp. 1476718X2096974
Author(s):  
Sara Cervantes ◽  
Anna Öqvist
Keyword(s):  
Qualitative Study ◽  
Educational Reform ◽  
Educational System ◽  
Professional Competence ◽  
Preschool Teachers ◽  
Division Of Labour ◽  
Study Data ◽  
Working Relationship ◽  
Policy Documents

Preschool teachers and caregivers have a close working relationship as part of a working team to benefit the children in Swedish preschools. In 2011, a new educational reform was introduced according to which preschools became a school form in their own right within the overall educational system in Sweden. The objective of the policy was to strengthen the profession of preschool teachers by affording them clearer responsibility over the quality of educational practices and curriculum work. It also entailed a division of labour between the preschool teachers and caregivers in the working team. The current study explored how Swedish preschool teachers and caregivers positioned themselves in response to these changes in responsibility. In this qualitative study, data were collected from 17 preschool teachers and caregivers via an open-ended questionnaire. Preschool teachers and caregivers viewed themselves as having equal responsibility in the working team. Specifically, preschool teachers upgraded the competence and position of caregivers while downgrading their own professional competence and position. Caregivers downgraded the profession and position of preschool teachers and upgraded their own competence and position to be equal to that of preschool teachers.

scholarly journals Virtual Router Design and Modeling for Future Networks with QoS Guarantees

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1139
Author(s):  
Mykola Beshley ◽  
Natalia Kryvinska ◽  
Halyna Beshley ◽  
Oleg Yaremko ◽  
Julia Pyrih
Keyword(s):  
Quality Of Service ◽  
Dynamic Reconfiguration ◽  
Future Internet ◽  
End Users ◽  
Mathematical Representation ◽  
Optimal Parameters ◽  
Resource Virtualization ◽  
Virtual Routers ◽  
Network Device

A virtual router model with a static and dynamic resource reconfiguration for future internet networking was developed. This technique allows us to create efficient virtual devices with optimal parameters (queue length, queue overflow management discipline, number of serving devices, mode of serving devices) to ensure the required level of quality of service (QoS). An analytical model of a network device with virtual routers is proposed. By means of the mentioned mathematical representation, it is possible to determine the main parameters of the virtual queue system, which are based on the first in, first out (FIFO) algorithm, in order to analyze the efficiency of network resources utilization, as well as to determine the parameters of QoS flows, for a given intensity of packets arrival at the input interface of the network element. In order to research the guaranteed level of QoS in future telecommunications networks, a simulation model of a packet router with resource virtualization was developed. This model will allow designers to choose the optimal parameters of network equipment for the organization of virtual routers, which, in contrast to the existing principle of service, will provide the necessary quality of service provision to end users in the future network. It is shown that the use of standard static network device virtualization technology is not able to fully provide a guaranteed level of QoS to all present flows in the network by the criterion of minimum delay. An approach for dynamic reconfiguration of network device resources for virtual routers has been proposed, which allows more flexible resource management at certain points in time depending on the input load. Based on the results of the study, it is shown that the dynamic virtualization of the network device provides a guaranteed level of QoS for all transmitted flows. Thus, the obtained results confirm the feasibility of using dynamic reconfiguration of network device resources to improve the quality of service for end users.

scholarly journals Surgical management of brain metastases

2007 ◽  
Vol 22 (3) ◽  
pp. 1-7 ◽  
Author(s):  
Moksha G. Ranasinghe ◽  
Jonas M. Sheehan
Keyword(s):  
Brain Tumors ◽  
Systemic Disease ◽  
Postoperative Management ◽  
Study Data ◽  
Preoperative Imaging ◽  
Metastatic Brain Tumors ◽  
Patients With Cancer ◽  
Proper Patient Selection ◽  
Positive Effect

✓Metastatic brain tumors continue to increase in incidence as patients with cancer live longer. The options for management continue to evolve as well, with advances in radiation-based treatment, chemotherapy, and surgery. Although metastatic brain tumors are frequently treated without surgical intervention, there continues to be a significant role for surgery in caring for patients with these lesions. Study data have proven that surgery has a positive effect on survival and quality of life in properly selected patients. Those with a suitable age, functional status, systemic disease control, and several metastases may be suitable for surgical treatment. Advances in preoperative imaging and planning as well as intraoperative surgical adjuncts have lowered the morbidity associated with resection. With proper patient selection and operative and postoperative management, resection continues to play a significant and evolving role in the care of patients with metastatic brain tumor.

Effect of Air Distribution on Solid Fuel Bed Combustion

1997 ◽  
Vol 119 (2) ◽  
pp. 120-128 ◽  
Author(s):  
J. T. Kuo ◽  
W.-S. Hsu ◽  
T.-C. Yo
Keyword(s):  
Combustion Efficiency ◽  
Pollutant Emissions ◽  
Air Distribution ◽  
Gas Temperature ◽  
One Dimensional ◽  
Supply And Distribution ◽  
Air Supply ◽  
Burning Rates ◽  
Side Walls ◽  
Detailed Chemical

One important aspect of refuse mass-burn combustion control is the manipulation of combustion air. Proper air manipulation is key to the achievement of good combustion efficiency and reduction of pollutant emissions. Experiments, using a small fix-grate laboratory furnace with cylindrical combustion chamber, were performed to investigate the influence of undergrate/sidewall air distribution on the combustion of beds of wood cubes. Wood cubes were used as a convenient laboratory surrogate of solid refuse. Specifically, for different bed configurations (e.g., bed height, bed voidage, bed fuel size, etc.), burning rates and combustion temperatures at different bed locations were measured under various air supply and distribution conditions. One of the significant results of the experimental investigation is that combustion, with air injected from side walls and no undergrate air, has the maximum combustion efficiency. On the other hand, combustion with undergrate air achieves higher combustion rates but with higher CO emissions. A simple one-dimensional model was constructed to derive correlation of combustion rate as a function of flue gas temperature and oxygen concentration. Despite the fact that the model is one-dimensional and many detailed chemical and physical processes of combustion are not considered, comparisons of the model predictions and the experimental results indicate that the model is appropriate for quantitative evaluation of bed-burning rates.

Investigation of the Effects of Sports Injuries on the Quality of Life of Adolescent Athletes

2021 ◽  
Vol 15 (10) ◽  
pp. 3276-3280
Author(s):  
Şebnem Şarvan Cengiz ◽  
Büşra Yardimci ◽  
Aybüke Ulubaş
Keyword(s):  
Quality Of Life ◽  
Female Athletes ◽  
Sports Injuries ◽  
Winter Season ◽  
Sports Injury ◽  
Study Data ◽  
Adolescent Athletes ◽  
Purposeful Sampling ◽  
Athlete Injury

The aim of the study is to examine the effects of sports injuries experienced by adolescent athletes between the ages of 13 and 18 on their quality of life during training and competition. The universe of the study consists of licensed athletes between the ages of 13-18 who play sports at the Manisa Youth and Sports Provincial Directorate. In the study, purposeful sampling method was chosen, and the study sample consisted of 170 athletes (97 females, 73 males) with sports injuries and 90 athletes (49 females, 41 males) without sports injuries, totally 260 volunteers. The demographic information form developed by the researchers, the Adolescent Form of the Quality of Life for Children (PedsQL) developed by Varni et al. (1999), the Adolescent Form of the Age of 13-18, and the Causes of Injury in Sports Questionnaire prepared by Alkaabi (2015) were used as data collection methods. As a result, it was found that female athletes had more sports injuries in adolescent athletes than men. The number of athletes who suffered injuries in defense sports is higher than in other branches. As a result, it has been determined that sports injury negatively affects the quality of life. It was found as a result of the study data that they experienced more injuries in training than in competitions. Since the injury is mostly in the winter season and the athletes stated that they did not use protective equipment during the injury, the trainers should be informed, they should be thoughtful about taking the necessary precautions and precautions and should be offered the necessary supervision. Keywords: Adolescent athlete, injury, quality of life

ANALISA PENGEMBALIAN MODAL PADA PETERNAKAN AYAM PETELUR RAJIMAN DI TANJUNG BINTANG

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Yudiana Sari ◽  
Keyword(s):  
Life Cycle ◽  
Study Data ◽  
Land Area ◽  
Farm Land ◽  
Chicken Egg ◽  
Key Word ◽  
The Future ◽  
The Village

Abstract This study using the object research is breeder chicken egg layer Surajiman, Tanjung Bintang. The effort farms chicken egg layer Surajiman, Tanjung Bintang. Was founded by Mr. Surajiman in 2016 in the Village Serdang IIIA, Tanjung Bintang. This is built on a farm land with a land area of 200 m2, with the number of cattle chicken as much as 600 tail. In this study data taken still 600 tail. In doing this business Mr. Surajiman still managed myself because the number of chicken in pet still relative a little. If a farm knowing stages where at first chicken only number 600 tail. On the life-cycle of certain before the production of the egg declined, then it can be added to the become more, in addition should also divide the chicken in some period of the age of chicken in order to maintain the cycle of the age of chicken so can improve the quality of the egg results his production. With knowing the cycle of chicken, it will make a farm become more advanced in the production of peck at her eggs and increased profits that in the future. Key Word : The point behind his back in the capital.

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