Economics of Biomass Kiln-Drying with Vortec Tube

2016 ◽  
Vol 832 ◽  
pp. 69-78
Author(s):  
Ludovít Kolláth ◽  
Matej Capek ◽  
Iveta Onderová
Keyword(s):  
Energy Balance ◽  
Thermal Energy ◽  
Energy Production ◽  
Point Of View ◽  
Energy Separation ◽  
Thermal Calculation ◽  
Cost Assessment ◽  
Hot Air ◽  
Compressed Gas ◽  
Operational Aspects

The aim of the paper is to analyze the application possibilities of the Vortec tube in relation to its energy and economic aspects.The first part consists of an introduction, a description of the energy separation phenomenon in the Vortec tube and the application possibilities and parameters affecting Vortec tube functioning.The second part of the paper deals with the energy balance and economic operational aspects of Vortec tubes produced commercially. The energy balance consists of a thermal calculation of the Vortec tube, the energy-efficiency identification of thermal energy production and a comparison with thermal equipment used in practice. The thesis next continues with an economic analysis of the Vortec tube’s operation, connected with the production of compressed gas. The output of this part is a cost assessment of thermal energy production by means of the Vortec tube and its economic classification in the thermal resources generally used in Slovakia.The last part of the paper includes a static thermal calculation of a dryer using hot air produced by the Vortec tube from the point of view its thermal and temperature potential.

scholarly journals Between aesthetics and functionality. Contemporary using of Photovoltaic Systems to create facades

2018 ◽  
Vol 49 ◽  
pp. 00111 ◽  
Author(s):  
Ilona Szefer
Keyword(s):  
Energy Balance ◽  
Thermal Energy ◽  
Energy Production ◽  
High Efficiency ◽  
Building Envelope ◽  
Point Of View ◽  
Photovoltaic Panels ◽  
Building Facades ◽  
Common Concept ◽  
Regenerative Energy

Buildings consume over 40 % [1] of the yearly demand for energy (in IEA member countries). Therefore, it is important to take this fact into account in the designing process - not only in terms of potential savings but also from the point of view of energy acquisition. That is why the external building finishing has an important influence on the energy balance as it may save thermal energy and convert sunlight directly into electricity. It is generally believed that the façade is the showcase of the building. An increasingly common concept for effective building facades, not only those newly-created but also after refurbishment, is photovoltaic panels. Regenerative energy production and architectural designing possibilities are no longer an obstacle. Due to a growing range of available cell technologies (polycrystalline, monocrystalline, high-efficiency and semitransparent), as well as designs (colors, overprints) and parameters (weight, power), their integration with building envelope is not longer an issue. Contemporary Photovoltiaics are designed and manufactured to meet the requirements of designers, builders, investors and the owners. The multifunctionality allows for energy production, as well as for shading, lighting contron and thermal insulation. Using Photovoltiaic systems eneables to create an unique facade construction as well as design.

scholarly journals A Feasibility Study of the Use of Smartwatches in Wearable Fall Detection Systems

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2254
Author(s):  
Francisco Javier González-Cañete ◽  
Eduardo Casilari
Keyword(s):  
Low Cost ◽  
Fall Detection ◽  
The Elderly ◽  
Point Of View ◽  
False Alarms ◽  
Battery Life ◽  
Area Network ◽  
Battery Lifetime ◽  
Detection Systems ◽  
Operational Aspects

Over the last few years, the use of smartwatches in automatic Fall Detection Systems (FDSs) has aroused great interest in the research of new wearable telemonitoring systems for the elderly. In contrast with other approaches to the problem of fall detection, smartwatch-based FDSs can benefit from the widespread acceptance, ergonomics, low cost, networking interfaces, and sensors that these devices provide. However, the scientific literature has shown that, due to the freedom of movement of the arms, the wrist is usually not the most appropriate position to unambiguously characterize the dynamics of the human body during falls, as many conventional activities of daily living that involve a vigorous motion of the hands may be easily misinterpreted as falls. As also stated by the literature, sensor-fusion and multi-point measurements are required to define a robust and reliable method for a wearable FDS. Thus, to avoid false alarms, it may be necessary to combine the analysis of the signals captured by the smartwatch with those collected by some other low-power sensor placed at a point closer to the body’s center of gravity (e.g., on the waist). Under this architecture of Body Area Network (BAN), these external sensing nodes must be wirelessly connected to the smartwatch to transmit their measurements. Nonetheless, the deployment of this networking solution, in which the smartwatch is in charge of processing the sensed data and generating the alarm in case of detecting a fall, may severely impact on the performance of the wearable. Unlike many other works (which often neglect the operational aspects of real fall detectors), this paper analyzes the actual feasibility of putting into effect a BAN intended for fall detection on present commercial smartwatches. In particular, the study is focused on evaluating the reduction of the battery life may cause in the watch that works as the core of the BAN. To this end, we thoroughly assess the energy drain in a prototype of an FDS consisting of a smartwatch and several external Bluetooth-enabled sensing units. In order to identify those scenarios in which the use of the smartwatch could be viable from a practical point of view, the testbed is studied with diverse commercial devices and under different configurations of those elements that may significantly hamper the battery lifetime.

Performance results of a solar greenhouse combining electrical and thermal energy production

2010 ◽  
Vol 106 (1) ◽  
pp. 48-57 ◽  
Author(s):  
P.J. Sonneveld ◽  
G.L.A.M. Swinkels ◽  
J. Campen ◽  
B.A.J. van Tuijl ◽  
H.J.J. Janssen ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Energy Production ◽  
Solar Greenhouse ◽  
Performance Results

scholarly journals Finding Hotspots of Thermal Energy Waste: Modelling the Energy Balance of a Noodle Production System

Procedia CIRP ◽  
2016 ◽  
Vol 48 ◽  
pp. 283-288
Author(s):  
Tobias Bestari Tjandra ◽  
Yee Shee Tan ◽  
Bin Song
Keyword(s):  
Energy Balance ◽  
Thermal Energy ◽  
Production System

Life cycle assessment of thermal energy production from short-rotation willow biomass in Southern Ontario, Canada

2017 ◽  
Vol 204 ◽  
pp. 343-352 ◽  
Author(s):  
Goretty M. Dias ◽  
Nathan W. Ayer ◽  
Kumudinie Kariyapperuma ◽  
Naresh Thevathasan ◽  
Andrew Gordon ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Thermal Energy ◽  
Energy Production ◽  
Southern Ontario ◽  
Short Rotation

scholarly journals Solar Tower Power Plants of Molten Salt External Receivers in Algeria: Analysis of Direct Normal Irradiation on Performance

2018 ◽  
Vol 8 (8) ◽  
pp. 1221 ◽  
Author(s):  
Abdelkader Rouibah ◽  
Djamel Benazzouz ◽  
Rahmani Kouider ◽  
Awf Al-Kassir ◽  
Justo García-Sanz-Calcedo ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Thermal Energy ◽  
Greenhouse Effect ◽  
Energy Production ◽  
Power Plants ◽  
Storage Capacity ◽  
Real Data ◽  
Multiple Power ◽  
And Storage

The increase of solar energy production has become a solution to meet the demand of electricity and reduce the greenhouse effect worldwide. This paper aims to determine the performance and viability of direct normal irradiation of three solar tower power plants in Algeria, to be installed in the highlands and the Sahara (Béchar, El Oued, and Djelfa regions). The performance of the plants was obtained through a system advisor model simulator. It used real data gathered from appropriate meteorological files. A relationship between the solar multiple (SM), power generation, and thermal energy storage (TES) hours was observed. The results showed that the optimal heliostat field corresponds to 1.8 SM and 2 TES hours in Béchar, 1.2 SM and 2 TES hours for El Oued, and 1.5 SM and 4 TES hours for Djelfa. This study shows that there is an interesting relationship between the solar multiple, power generation, and storage capacity.

scholarly journals Departamento de Ecología Funcional y Aplicada, Instituto de Ecología, Universidad Nacional Autónoma de México

2017 ◽  
pp. 83
Author(s):  
Victor L. Barradas
Keyword(s):  
Energy Balance ◽  
Control Systems ◽  
Environmental Changes ◽  
Heat Fluxes ◽  
Point Of View ◽  
Net Energy ◽  
Sensible Heat ◽  
Species Establishment ◽  
Physical Barriers ◽  
A Site

<p>The deforestation of a site for agriculture and/ or cattle raising purposes changes either microclimate and soil properties. These environmental changes can act as physical barriers which drastically limits tree species establishment in reforestation . From microclimatic point of view, the study of the energy balance plays a key role when the original environment is severely changed. The net energy in a site is mainly dissipated by latent and sensible heat fluxes which are associated to evapotranspiration and thermal regimes,<br />respectively. The analyses of these fluxes allow to design control systems to reduce the high evaporation rates and high temperatures registered in a deforested site. Energy balance, latent and sensible heat fluxes and other components are analysed, and some techniques to manipulate energy balance are also presented.</p>

scholarly journals A 6-Components Mechanistic Model of Cutting Actions in Milling

2021 ◽  
Author(s):  
Maël Jeulin ◽  
Olivier Cahuc ◽  
Philippe Darnis ◽  
Raynald Laheurte
Keyword(s):  
Energy Balance ◽  
Experimental Model ◽  
Cutting Forces ◽  
Mechanistic Model ◽  
Cutting Parameters ◽  
Point Of View ◽  
Stress Fields ◽  
Mechanistic Modelling ◽  
Cutting Zone ◽  
Energetic Point

Abstract Most of the cutting models developed in the literature attest only to the presence of cutting forces in the balance of mechanical actions resulting from cutting. However, several studies have highlighted the presence of cutting moments during machining, and particularly 3D cutting in milling. The objective of this paper is to characterise phenomena associated with cutting moments by performing experimental mechanistic modelling in 3D cutting. For this purpose, several modelling factors will be investigated, such as the 3D cutting reference frame, the undeformed chip section, the cutting parameters, the cutting zone, etc. The predictive model of this study proves to be relatively efficient for an experimental model and allows a global prediction of cutting moments in milling. Furthermore, beyond the aspect of stress fields in the workpiece caused by cutting moments, this paper gives perspectives from an energetic point of view for which the share of moments in the energy balance could be substantial for monobloc tools.

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