Automatic Blade Shape Optimization of a Three-Bladed Modified Savonius Turbine

In this study, the performance of a new wind turbine design derived from a conventional Savonius turbine is optimized by numerical simulation. The new design consists of three blades without passage between them (closed center). The coupling between the CFD codes (ANSYS Fluent) and the optimizer (OPAL) is used through an automatic procedure in-house codes, as documented, for example, in Thévenin et al.’s Optimization and Computational Fluid Dynamics (2008). A single-objective function (output power coefficient, Cp) is considered as the target of the optimization technique and the shape of the blade as an optimization parameter and relies on evolutionary algorithms. An optimal solution can emerge from this optimization study. By comparison between regular design (semi-cylindrical shape blades) and the optimal configuration, a considerable improvement (up to 7.13% at λ = 0.7) of the optimal configuration performance can be obtained in this manner.

Assessing the quality of a network of vector-field sensors

An experiment consisting of a network of sensors can endow several advantages over an experiment with a single sensor: improved sensitivity, error corrections, spatial resolution, etc. However, there is often a question of how to optimally set up the network to yield the best results. Here, we consider a network of devices that measure a vector field along a given axis; namely for magnetometers in the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). We quantify how well the network is arranged, explore characteristics and examples of ideal networks, and characterize the optimal configuration for GNOME. We find that by re-orienting the sensitive axes of existing magnetometers, the sensitivity of the network can be improved relative to the past science runs.

Catch-Up Development VS. Forward-Looking Development: from Theoretical Models to Developmental State Practices

The presented article was carried out within the framework of scientific project dedicated to Russia's participation in the export and import of institutions. The solid question arose that the conditions and specificity of Russia's place in these processes are related to its position in the global world economy. These problems are considered within the framework of competing concepts of catch-up and forward-looking development in the economic literature. Comparative characteristics of methodological foundations, provisions and normative recommendations of these concepts are highlighted in the article. The analysis shows that there is no ground to justify the absolutization of their differences. Representatives of competing approaches came to the conclusion that it was necessary to search for the optimal configuration of imported and genuine institutions at the level of specific problems of development of countries that were largely on the periphery of the modern global economy. This configuration provides productive orientation of economic actors and creation of favorable conditions for the development of Schumpeterian type innovations. The solution of these tasks is linked with the formation and activities of developmental state. The functions of such a state are fundamentally different from compensating market failures that is characteristic of developed market economy. Such a state acts as a subject that forms the basic institutions of the economic system. Fundamental importance is its ability to ensure the combination of selective imports of institutions with the modification of genuine institutions that have historical and cultural specificity. Characteristics of the reasons and conditions for the successful solution of these tasks by countries such as Japan, Taiwan and South Korea, are highlighted in the article. The success stories are compared to the experience of partial failure of developmental state in Brazil. The fulfilled study is of interest not only for positive analysis, but also for the elaboration of normative recommendations for the formation of optimal configuration of imported and genuine institutions in contemporary Russia.

Investigation of Optimal Aspect Ratio and Optimal Number of Fins for Thermal Performance of Finned-Concentric-Tube Thermal Energy Storage

This research focuses on the enhancement of the heat transfer in the concentric tube type of thermal energy storage (TES). The collective influence of the aspect ratio and number of fins is investigated. First, an optimal aspect ratio of the concentric tube TES is found. Additionally, then, the optimal number of fins is found. This combined optimal configuration of TES is then compared with concentric tube TES without. Liquid fraction of the combined optimal configuration was increased by 100% for case of charging as compared to TES without fins.

Two-Stage Lifecycle Energy Optimization of Mid-Rise Residential Buildings with Building-Integrated Photovoltaic and Alternative Composite Façade Materials

Reducing the lifecycle energy use of buildings with renewable energy applications has become critical given the urgent need to decarbonize the building sector. Multi-objective optimizations have been widely applied to reduce the operational energy use of buildings, but limited studies concern the embodied or whole lifecycle energy use. Consequently, there are issues such as sub-optimal design solutions and unclear correlation between embodied and operational energy in the current building energy assessment. To address these gaps, this study integrates a multi-objective optimization method with building energy simulation and lifecycle assessment (LCA) to explore the optimal configuration of different building envelopes from a lifecycle perspective. Major contributions of the study include the integrated optimization which reflects the dynamics of the whole lifecycle energy use. Insights from the study reveal the optimal configuration of PV and composite building façades for different regions in sub-Saharan Africa. The lifecycle energy use for the optimized building design resulted in 24.59, 33.33, and 36.93% energy savings in Ghana, Burkina Faso, and Nigeria, respectively. Additionally, PV power generation can efficiently cover over 90% of the total building energy demand. This study provides valuable insights for building designers in sub-Saharan Africa and similar areas that minimize lifecycle energy demand.