{"title":"Rajshahi, A pollution free city: Effects of implied elements and battery rickshaw towards a sustainable environment","authors":"Rubaba Archi, M. Hossain","doi":"10.32438/sa.120.3002","DOIUrl":"https://doi.org/10.32438/sa.120.3002","url":null,"abstract":"This paper describes how the city of Rajshahi fought back air pollution through adopting mitigation measures by identifying every possible contributing factors of the pollution. The paper also includes how implementing battery operated rickshaw as a means of intercity transportation impacted the pollution level and contributed towards sustainable environment. The paper covers the details about the problem identification process and the mitigation measures taken by the engineers in the Rajshahi City Corporation. As a result of the steps taken, Rajshahi showed a 67.2% percent decline in concentration of PM10 particles, from 195 micrograms per cubic meter of air volume in 2014 to 64 micrograms for cubic meters. This was the largest percentage reduction in PM10 concentration worldwide. PM2.5 concentration also nearly halved from 70 micrograms per cubic meter to micrograms per cubic meter. The report where this achievement was announced was published by World Health Organization (WHO). By analyzing the discussion it was concluded that Rajshahi was a model city and can be considered as a benchmark and ideal for other cities to follow to reduce air pollution and create a sustainable environment.","PeriodicalId":300976,"journal":{"name":"Sukatha procedia","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132346419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Dorji, T. Lhendup, U. Rinzin, S. Tenzin, Pema Dhendup
{"title":"Feasibility of harvesting rainwater for power generation","authors":"C. Dorji, T. Lhendup, U. Rinzin, S. Tenzin, Pema Dhendup","doi":"10.32438/sa.120.3001","DOIUrl":"https://doi.org/10.32438/sa.120.3001","url":null,"abstract":"This paper discusses the possibility of using storage rainwater to produce electricity from high-rise residential buildings. Rainwater could be harnessed and funneled to drive a small dc generator. The tallest building on campus, RK Hostel, was selected for this study. It stands at a height of 20m and has a roof catchment area of 905 m2 which would accumulate 15,000 liters of rainwater. The amount of electric power (P) is determined by the vertical downspout pipe's pressure head (H) and flow rate (Q). The schematic model is developed in Matlab/Simulink and then simulated to see how much electricity it can generate. From the simulation results it is observed, a 17m vertical conduit pipe with a steady discharge rate of 7.8 lit/sec could produce about 600 watts of electricity.","PeriodicalId":300976,"journal":{"name":"Sukatha procedia","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124828816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Namgay Tenzin, Kamal Chapagai, C. Dorji, Nima Dukpa
{"title":"Design and development of prototype electric fence energizer","authors":"Namgay Tenzin, Kamal Chapagai, C. Dorji, Nima Dukpa","doi":"10.32438/sa.120.3009","DOIUrl":"https://doi.org/10.32438/sa.120.3009","url":null,"abstract":"A research project was carried out to design and develop an electric fence energizer that is energy efficient, robust, and effective. An experimental-based applied research project was being developed and carried out under the aegis of Centre for Renewable and Sustainable Energy Development, College of Science and Technology (CST), Phuenthsoling, Bhutan. Two models were designed and developed for laboratory and field tests; one based upon Zero Voltage Switching (ZVS) high impedance-based energizer and another with a low impedance-based energizer. Extensive simulations and laboratory testings were carried out for both models. The field tests were also carried out at CST, Genekha, and Begana in Thimphu, Bhutan. From the analysis, it was observed that both the models would work as designed if the fence is ideal (Infinite Impedance between fence and ground). The ideal fence is not possible in reality, there will be some faults, therefore the impulse output voltage of the ZVS based energizer falls to as low as 2.2 kV with which the electric fence becomes ineffective which was observed in the field tests conducted at Genekha and Begana, Thimphu, Bhutan. Therefore, a second model was designed based on the low impedance drive system, which would not require an ideal fence. The field tests conducted at CST showed that the impulse output voltage was 7 to 8kV for 1.5 seconds against a design rating of 14 kV even when the fence was faulty. For both, the models designed the maximum energy output is 2.5 joules. Further detailed laboratory and field tests are required to validate and ascertain the robustness of the designed model.","PeriodicalId":300976,"journal":{"name":"Sukatha procedia","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115633902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Underground spaces natural energy applied in the building thermal conditions performance in summer conditions","authors":"E. Conceicao, João Gomes, M. Lúcio, H. Awbi","doi":"10.32438/sa.120.3006","DOIUrl":"https://doi.org/10.32438/sa.120.3006","url":null,"abstract":"This paper presents a numerical simulation, done by a Building Dynamic Software, of an application of underground thermal energy storage in a university building with complex topology. In this study, the level of thermal comfort of the occupants of a building located in a Mediterranean type environment is evaluated for typical summer conditions. The Building Dynamic Software calculates the air temperature of the spaces, the surface temperature of opaque bodies, transparent bodies and internal bodies, the mass of contaminants and water inside the spaces and in the surfaces, the thermal comfort of the occupants, the indoor air quality and the flow thermal energy from underground to the occupied spaces. The university building is divided into 319 spaces, distributed by four floors, and is composed by 329 transparent surfaces (windows) and 3585 opaque surfaces (internal and external walls, doors, and others). Below the ground floor is numerically considered an underground floor, with the same area of the building and with a typical floor height, used to thermal energy storage. The building internal ventilation system, during the day, transport the cooled airflow from the underground to thermally uncomfortable spaces. The cooled airflow is transported to spaces turned to East in the morning and to spaces turned to West in the afternoon. However, throughout the day the cooled air is transported to all the south-facing spaces. Two situations were simulated numerically: with and without underground thermal energy storage. The occupancy and the internal ventilation were also considered. The results show that the internal airflow and the outside temperatures recorded during the 24 hours of the day allow to guarantee the necessary underground thermal energy storage to cool the more uncomfortable spaces. The indoor air quality is acceptable and the thermal comfort level of occupants, considering their adaptation, is near the acceptable level suggested by the standards.","PeriodicalId":300976,"journal":{"name":"Sukatha procedia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130526456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preface to Sukatha Adhiveshn 2020","authors":"","doi":"10.32438/sa.120.3000","DOIUrl":"https://doi.org/10.32438/sa.120.3000","url":null,"abstract":"Sukatha Adhiveshn; Sukatha meaning happy stories is a special issue Adhiveshn (conference) with the intention to highlight South Asian Appropriate Technology Innovations in different fields of technology. In the post pandemic era we in south Asia need to decouple from reliance on western innovations but foster regionally developed sustainable innovations. Every year a different area of technology specialty will be themed. The flagship publication of the themed conference is Sukatha Adhiveshn with the aim to be the platform of information dissemination on regional appropriate technology innovations, a platform to serve as a hub for regional innovators to tell their stories of innovations serving the rural communities of Afghanistan, Bangladesh, Bhutan, India, Nepal, Maldives, Pakistan, and Sri Lanka. The contributions published in Sukatha Adhiveshn will highlight innovations that has the potential to uplift the population of the region and contribute to the regional development of South Asia.","PeriodicalId":300976,"journal":{"name":"Sukatha procedia","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125154703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
