Journal of Energy Science and Technology is an international, peer-reviewed open access journal dedicated to advancing research the field of energy science and technology. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: In view of China’s existing problems in the preservation and redevelopment of historical buildings in China, the concept of green rehabilitation of historical buildings is proposed, and its development process of is briefly summarized explaining the advantages and developmental necessities of green rehabilitation of historical buildings. From the perspective of WRS, the strength and weakness of the green rehabilitation of historical buildings in China currently, as well as external opportunities and threats, are sorted out. The AHP analysis is used to optimize the element structure of development. And it abstracts social consensus, professional technology, standard implementation system, financial support and social capital as the five core elements and their interaction in the development of green regeneration of historical buildings in China. Combined with the characteristics of five utilization types of Chinese historical buildings, this paper classifies and analyzes the corresponding important development factors, and further puts forward the corresponding development suggestions of two modes in combination with the cases of domestic historical buildings with better green regeneration.Abstract: In view of China’s existing problems in the preservation and redevelopment of historical buildings in China, the concept of green rehabilitation of historical buildings is proposed, and its development process of is briefly summarized explaining the advantages and developmental necessities of green rehabilitation of historical buildings. From the p...Learn More
Abstract: To conduct the research on voltage stability online-monitoring simulation system in the photovoltaic (PV) power gird-connected system, a classic 3-bus power system containing a PV power station with a flexible setting capacity (including distributed PV, relatively large-scale and large-scale PV, and super large-scale PV base, etc.) is taken as the test example. According to the IEC 61970 Standard Part 301 (Common Information Model, CIM), CIM modeling method for the PV grid-connected 3-bus system is studied by using the Rational Rose software and the unified modeling language UML, and the PV grid-connected system’s network connection model, each load model, measurement model and topological model are established; meanwhile, the PV power is treated as a load model to simplify the modeling process. On the basis of the established CIM model of the PV grid-connected system, the method of mapping the common information model to the relational database is studied and an applied mapping diagram is set up. Then the database technology is used to deposit the established CIM model into the created database for the use of Energy Manage System (EMS) and each utility software such as the voltage stability online-monitoring software in the PV grid-connected system. Then, the database is technically connected to the voltage stability online-monitoring software of the PV grid-connected system, and the communication between the station terminal and the monitoring terminal can be realized.Abstract: To conduct the research on voltage stability online-monitoring simulation system in the photovoltaic (PV) power gird-connected system, a classic 3-bus power system containing a PV power station with a flexible setting capacity (including distributed PV, relatively large-scale and large-scale PV, and super large-scale PV base, etc.) is taken as the ...Learn More
Abstract: To solve the problem that it is difficult to realize efficient prop of fracture network system in the volume fracturing process of shale reservoir, the migration and settlement mechanism of proppant in fractures is analyzed, the migration law of proppant under different particle size and different combination conditions is studied by using true three-dimensional simulation software, and the distribution of proppant concentration and fracture conductivity are simulated. On this basis, the applicability of proppant with different particle sizes under different fracture morphology is judged, and the combination of proppant particle sizes is optimized to maximize the full prop of the fracture network system, improve the conductivity of the fracture network system, and realize efficient fracturing stimulation of shale reservoirs. The research shows that when the fracture width is very small and the average fracture width is less than 1mm, it is difficult for medium/large size proppant to enter the fracture network and achieve effective fracturing prop. Therefore, it is recommended to use small/micro size proppant. Under the condition that the average fracture width is greater than 1mm and the proppant with large particle size can effectively enter the fracture, the combination of large size + medium size proppant particles settle quickly, and the porosity of the sand dike is large, which can reach a larger equilibrium height, increase the effective support width of the fracture, and improve the conductivity of the fracture network. The fracture conductivity is not only related to the proppant placement concentration, but also depends on the proppant placement structure in the fracture. After the fracture is effectively propped, further increasing the proppant concentration will block the fracture system and reduce the conductivity. Therefore, it is not suitable to pump small size proppant after pumping large/medium size proppant, so as to avoid unnecessary plugging to the proppant. Small size proppant is suitable for use in the early pumping phase.Abstract: To solve the problem that it is difficult to realize efficient prop of fracture network system in the volume fracturing process of shale reservoir, the migration and settlement mechanism of proppant in fractures is analyzed, the migration law of proppant under different particle size and different combination conditions is studied by using true thr...Learn More
Abstract: To resolve the problem of the imbalance between micro-Combined Heat and Power (m-CHP) supply and demand, a district energy network has been established based on residential m-CHP units powered by natural gas-fueled internal combustion engine. The electric and thermal loads of a Harbin residential building in a typical winter heating week are calculated. The performance of the m-CHP systems operating in two operation strategies, i.e., Following the Electric Load (FEL) and Following the Thermal Load (FTL), are analyzed and evaluated from both energy and economic aspects. The result shows that the energy cost of the m-CHP is reduced by 10% when operating in FTL mode, and the income from selling excess energy is 2.7 times more than that in FEL mode, indicating lower operation costs in FEL mode. Moreover, compared with the traditional separate production of electricity and heat, the net cost reduction rate of the system in FEL and FTL mode is 13.68% and 38.83%, respectively. Micro-CHP operating in a district energy network is more profitable than traditional separate electricity and heat production.Abstract: To resolve the problem of the imbalance between micro-Combined Heat and Power (m-CHP) supply and demand, a district energy network has been established based on residential m-CHP units powered by natural gas-fueled internal combustion engine. The electric and thermal loads of a Harbin residential building in a typical winter heating week are calcul...Learn More
