Solar Compass最新文献_第3页

Experimental study on conversion of blanched grapes to raisins without chemicals through solar dryer to reduce drying time

Solar Compass Pub Date : 2024-12-01 DOI: 10.1016/j.solcom.2024.100098

Nitin Sharma, Namrata Sengar

{"title":"Experimental study on conversion of blanched grapes to raisins without chemicals through solar dryer to reduce drying time","authors":"Nitin Sharma, Namrata Sengar","doi":"10.1016/j.solcom.2024.100098","DOIUrl":"10.1016/j.solcom.2024.100098","url":null,"abstract":"<div><div>Solar dryers are solar thermal devices which increase the drying temperature and aid in moisture removal from the load, leading to faster drying of the agri-product as compared to the open sun drying. Conversion of grapes to raisins can be effectively achieved through solar dryers, and efforts are ongoing to improve the efficiency and further reduce the drying time. Usually in order to reduce the drying time for the conversion of grapes to raisins several pre-treatment methods with the use of chemicals are employed. In the present work pre-treatment in the form of blanching of grapes is adopted without the use of any chemicals to study the effect on the drying time in the solar dryer. The experimental results have been compared with the study of conversion of grapes to raisins with the same solar dryer without blanching. It is found that pre-treatment in the form of blanching resulted in a reduction in drying time to almost half. Experimental observations for the temperature profile studies relating to ambient temperature, air temperature inside the dryer, base plate temperature and solar radiation are presented in the form of graphs and calculations have been carried out for the estimation of drying rate and efficiency.</div></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100098"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of solar photovoltaics on university buildings: A case study toward campus sustainability

Solar Compass Pub Date : 2024-12-01 DOI: 10.1016/j.solcom.2024.100100

Antônia Sônia Alves Cardoso Diniz , Gisele Mol da Silva , Raphaela E. Alves Nunes , Vinícius Augusto Camatta Santana , Daniel Sena Braga , Cristiana Brasil Maia

{"title":"Evaluation of solar photovoltaics on university buildings: A case study toward campus sustainability","authors":"Antônia Sônia Alves Cardoso Diniz , Gisele Mol da Silva , Raphaela E. Alves Nunes , Vinícius Augusto Camatta Santana , Daniel Sena Braga , Cristiana Brasil Maia","doi":"10.1016/j.solcom.2024.100100","DOIUrl":"10.1016/j.solcom.2024.100100","url":null,"abstract":"<div><div>Renewable energy leads Brazil's energy mix at about 82 % of its total, with solar photovoltaics (PV) now the second largest contribution to the electric power sector. The country's target to eliminate carbon emissions provides a significant role for higher-education institutions that shape and influence future societies through energy and education leadership. This paper focuses on the improvement of the sustainability level of the PUC Minas university campus in Belo Horizonte, Brazil, through the assessment and design of a PV system into the existing engineering building structures. The student-led case study provides an implementation roadmap that includes a coordinated methodology of evaluating the campus power and energy consumption, documenting the seasonal solar irradiance, evaluating the solar-available rooftop areas, simulating the daily and seasonal shadowing effects from existing surrounding structures, determining the panel placements following Brazil's codes and standards, and calculating the contributions of the PV to displacing grid-supplied electricity and potential lowering of the University's energy bills. The result is a realistic PV system design that meets the emission and electricity-cost reduction objectives, with a value-added aspect is that the lead team interfaced with ongoing Energy-Engineering course participants for real-time exposure to the research and photovoltaics technology. Additionally, the value analysis of the project is aimed at improving the University's Times Higher Education Ranking by addressing the United Nations Sustainability Development Goals (SDG) that correlate with the clean energy solar installation.</div></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100100"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The macro view of solar policy: The case for supporting utility-scale power 太阳能政策的宏观视角：支持公用事业规模发电的理由

Solar Compass Pub Date : 2024-11-22 DOI: 10.1016/j.solcom.2024.100096

Andy Hira , Prasanna Krishnan

引用次数: 0

Determination of drying performance of different slice thicknesses from different cassava varieties using hybrid dryer 利用混合干燥器确定不同木薯品种不同切片厚度的干燥性能

Solar Compass Pub Date : 2024-11-10 DOI: 10.1016/j.solcom.2024.100097

Kodwo A. Budu , Joseph O. Akowuah , Emmanuel Y.H. Bobobee , Kojo A. Aikins , Albert K. Arkoh , Eric A. Asante

{"title":"Determination of drying performance of different slice thicknesses from different cassava varieties using hybrid dryer","authors":"Kodwo A. Budu , Joseph O. Akowuah , Emmanuel Y.H. Bobobee , Kojo A. Aikins , Albert K. Arkoh , Eric A. Asante","doi":"10.1016/j.solcom.2024.100097","DOIUrl":"10.1016/j.solcom.2024.100097","url":null,"abstract":"<div><div>Food provides most of the needed energy by humans to carry out their daily activities, but the issue of post-harvest losses is having an adverse effect on its production. In order to mitigate some of these post-harvest challenges, farmers in some of the developing countries have turned their attention on cassava production as the crop can provide food security. Cassava is also a drought resistant crop and can be left in the soil for a long time. However, cassava is equally one of the tuber crops with a very high deterioration rate. Numerous researches have been conducted in a way to find means of reducing these quick post-harvest losses with the emphases on drying. However, little information exists to show how wide variety of cassava sliced at different thicknesses perform when they are being dried, and how the principal dimensions of these dried chips can influence effective packaging. This study investigated the drying performance of seven cassava varieties sliced at three different thicknesses, and how their principal dimensions influenced effective packaging. The results obtained show that there was no obvious linear drying pattern for any of the cassava varieties. Again, CRI-Abrabopa had the highest drying time of 300 min., 240 min., and 210 min., for the 10 mm, 8 mm and 5 mm thick cassava slices, respectively. CRI-Dudzi was found to have been the variety to have lost more moisture with the highest drying rates of 0.0088 kg/min. for the 10 mm thick cassava slice, and 0.009 kg/min. for the 8 mm thick cassava slice. Moreover, Afisiafi obtained the lowest geometric mean diameter of 15.57 mm, 18.23 mm and 22.33 mm, accordingly for the 5 mm and 10 mm thick cassava slices, which made it easier for it to be packaged effectively</div></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100097"},"PeriodicalIF":0.0,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of single slope solar still for culinary wastewater treatment 用于烹饪废水处理的单坡太阳能蒸馏器实验研究

Solar Compass Pub Date : 2024-10-21 DOI: 10.1016/j.solcom.2024.100095

Karthick Uthappan , Subramanian Murugesan , Ganesh Karuppasamy , Karthickmunisamy Thangavel

引用次数: 0

Opportunities to Enhance sCO2 Power Cycle Turbomachinery with Bearingless Motor/Generators 利用无轴承电机/发电机改进 sCO2 动力循环涡轮机械的机会

Solar Compass Pub Date : 2024-10-01 DOI: 10.1016/j.solcom.2024.100094

Takahiro Noguchi , WaiYan Chan , Nathan Petersen , Logan Rapp , Eric Severson

{"title":"Opportunities to Enhance sCO2 Power Cycle Turbomachinery with Bearingless Motor/Generators","authors":"Takahiro Noguchi , WaiYan Chan , Nathan Petersen , Logan Rapp , Eric Severson","doi":"10.1016/j.solcom.2024.100094","DOIUrl":"10.1016/j.solcom.2024.100094","url":null,"abstract":"<div><div>Thermal power cycles using sCO<sub>2</sub> as a working fluid place extreme demands on their turbomachinery components and their electric motors/generators. In this paper, new system topologies for sCO<sub>2</sub> turbomachinery are proposed which take advantage of “bearingless” electric machine technology to improve performance. Bearingless motors/generators are a new type of electric machine which integrate the functionality of active magnetic bearings into the existing hardware of an electric motor/generator. The existing electromagnetic surfaces and materials are reused to enable controllable production of radial forces on the machine shaft. This is envisioned to improve hermetic direct-drive turbomachinery systems by either augmenting existing bearings (i.e., bearing assist) or replacing existing bearings (i.e., bearing removal). The state-of-the-art technologies for several bearing types (gas foil bearings, externally pressurized porous (EPP) gas bearings, and active magnetic bearings) and electric machines are reviewed to motivate the introduction of bearingless technology. Two system designs using bearingless machines are proposed and compared against existing commercial solutions in terms of maximum shaft weight, number of passthroughs into the hermetic environment, cost, and complexity. A case-study bearingless motor/generator is assessed via simulations and a hardware prototype to investigate practical considerations for using bearingless technology in sCO<sub>2</sub> turbomachinery. The proposed bearingless solutions have potential to enable a new generation of sCO<sub>2</sub> turbomachinery with improved reliability, reduced complexity, and lower cost. This paper shows that by transforming the motor/generator already present in turbomachinery into a bearingless motor/generator, the technical challenges involved with sCO<sub>2</sub> can be overcome without adding significant cost.</div></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100094"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy enhancement of building-integrated photovoltaic/thermal systems: A systematic review 建筑一体化光伏/供热系统的节能效果：系统综述

Solar Compass Pub Date : 2024-09-26 DOI: 10.1016/j.solcom.2024.100093

Hussein A. Kazem , Miqdam T. Chaichan , Ali H.A. Al-Waeli , K. Sopian , Naser W. Alnaser , Waheeb E. Alnaser

引用次数: 0

Application of three Transformer neural networks for short-term photovoltaic power prediction: A case study 三变压器神经网络在短期光伏功率预测中的应用：案例研究

Solar Compass Pub Date : 2024-09-17 DOI: 10.1016/j.solcom.2024.100089

Jiahao Wu , Yongkai Zhao , Ruihan Zhang , Xin Li , Yuxin Wu

{"title":"Application of three Transformer neural networks for short-term photovoltaic power prediction: A case study","authors":"Jiahao Wu , Yongkai Zhao , Ruihan Zhang , Xin Li , Yuxin Wu","doi":"10.1016/j.solcom.2024.100089","DOIUrl":"10.1016/j.solcom.2024.100089","url":null,"abstract":"<div><p>In order to solve the potential safety hazards caused by the fluctuation of photovoltaic (PV) power generation, it is necessary to predict it in advance and take countermeasures as soon as possible. Based on the three models of vanilla Transformer, Informer, and Autoformer, this paper considers three prediction scenarios: zero-cost prediction, low-cost prediction, and high-cost prediction, and realizes the power prediction under two prediction horizons of 4 h and 24 h for a matrix of a centralized PV power station in Hubei Province, China. The results of some configurations meet the industry-recommended metric requirements, and the overall performance of the vanilla Transformer is better than Informer and Autoformer. After comparing the three models and different prediction intervals, and considering the practical industrial demand, this paper gives recommended configurations for both 4 h and 24 h predictions. The practical rolling prediction performance of the recommended configurations demonstrates the applicability and flexibility of the proposed methods.</p></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100089"},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772940024000237/pdfft?md5=594e66ba68e3b10bd886384b21fc172f&pid=1-s2.0-S2772940024000237-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Supporting strategy for investment evaluation of photovoltaic power generation engineering projects using multi-criteria decision analysis methods 采用多标准决策分析方法的光伏发电工程项目投资评估支持策略

Solar Compass Pub Date : 2024-09-16 DOI: 10.1016/j.solcom.2024.100092

Panagiotis Raptis , Georgios Aretoulis

{"title":"Supporting strategy for investment evaluation of photovoltaic power generation engineering projects using multi-criteria decision analysis methods","authors":"Panagiotis Raptis , Georgios Aretoulis","doi":"10.1016/j.solcom.2024.100092","DOIUrl":"10.1016/j.solcom.2024.100092","url":null,"abstract":"<div><p>This scientific study examines the evaluation of photovoltaic power generation projects through the application of multi-criteria decision analysis methods. Two groups of large-scale grid-connected PV power generation system projects with a nominal power of 50 MW and 500 MW respectively were analyzed and evaluated. These systems were designed to be installed in the same wider geographical area in northern Greece, but they were differentiated in the part of the PV circuit. Twelve systems were analyzed in which either monocrystalline silicon panels or poly-crystalline silicon panels or bifacial photovoltaic panels were to be installed. In these systems either central photovoltaic inverters or photovoltaic string inverters were considered for installation. The following criteria were used to evaluate the investment in these projects. These criteria were related to the profitability, the financial cost, the technical level, and the electrical energy production of the systems and these were the initial investment cost, the operation and maintenance cost, the levelized cost of electricity, the net present value, the internal rate of return, the capital recovery or payback period, the technical level of the photovoltaic circuit, the technical maturity of the photovoltaic circuit, and the annual electricity production. The evaluation of these criteria was initially conducted with fixed weighting coefficients followed by a sensitivity analysis of these weighting coefficients. The results of the evaluation using the PROMETHEE, AHP and TOPSIS multi-criteria decision analysis methods showed that the PV power generation systems which should be preferred are those with increased nominal power, where monocrystalline silicon technology panels are employed following the central inverter topology.</p></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100092"},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772940024000262/pdfft?md5=330f3b7b5a6de4073d3dd53d403fe758&pid=1-s2.0-S2772940024000262-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing economic viability and environmental impact of solar-powered EV charging station in Gazipur, Bangladesh: A case study 评估孟加拉国加济布尔太阳能电动汽车充电站的经济可行性和环境影响：案例研究

Solar Compass Pub Date : 2024-09-13 DOI: 10.1016/j.solcom.2024.100091

M. Naem Hossain , Muhammad Mahmood Hasan , M. Ahsan Habib , Fatin Bin Ferdous , Sazid Rahman

{"title":"Assessing economic viability and environmental impact of solar-powered EV charging station in Gazipur, Bangladesh: A case study","authors":"M. Naem Hossain , Muhammad Mahmood Hasan , M. Ahsan Habib , Fatin Bin Ferdous , Sazid Rahman","doi":"10.1016/j.solcom.2024.100091","DOIUrl":"10.1016/j.solcom.2024.100091","url":null,"abstract":"<div><p>Due to technological advancement and modernization, the demand for Electric Vehicles (EVs) is rising. In Bangladesh, there is a growing demand for electric vehicles such as auto-rickshaws and easy bikes, and electric automobiles will be familiar soon. The demand for electrically powered vehicles is increasing in response to growing environmental concerns; it helps balance the greenhouse effect and global warming. Solar-based charging systems are becoming increasingly popular due to their low greenhouse gas (GHG) emissions. The CO<sub>2</sub> emissions produced by solar-based EV charging systems are lower than those produced by coal-based chargers. Moreover, the Government of Bangladesh wants to accomplish Sustainable Development Goal (SDG) 7 by 2030 by increasing the proportion of accessible, cutting-edge, renewable energy sources. This study investigates and analyses the technological, economic, and ecological viability of a solar PV power plant in Bangladesh for charging EVs. This study examined solar-based EV charging stations, which generate 36,785.76 MWh of electricity for 20 years of their lifetime and are used to charge EVs. Furthermore, the net present value (NPV) is USD 652,656.80, the initial investment is USD 1,365,300, the Internal Rate of Return (IRR) is 11.70 %, and the Payback Period (PBP) is 7.2 years. Approximately per day, 250 battery-operated three-wheeler EVs can be charged using the generated electricity. In addition, the project will prevent the emission of 24,013.86 tons of CO<sub>2</sub>, 251.25 tons of SO<sub>2</sub>, 63.39 tons of NO<sub>x</sub>, and 12.55 tons of CO. Eliminating these GHG emissions may also aid Bangladesh in achieving SDG 13.</p></div>","PeriodicalId":101173,"journal":{"name":"Solar Compass","volume":"12 ","pages":"Article 100091"},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772940024000250/pdfft?md5=3efd21fc4512d52d7f9924b302fbe9c6&pid=1-s2.0-S2772940024000250-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0