scholarly journals Impact of pre-treatment by torrefaction and carbonization on temperature field, energy efficiency and tar content during the gasification of cotton stalks

2018 ◽  
Vol 10 (2) ◽  
pp. 7-18
Author(s):  
Gado Ibrahim Harouna ◽  
Sanogo Oumar ◽  
Koucka Ouiminga Salifou ◽  
Daho Tizane ◽  
Koulidiati Jean
Keyword(s):  
Energy Efficiency ◽  
Temperature Field ◽  
Field Energy ◽  
Cotton Stalks ◽  
Pre Treatment

scholarly journals Guidelines on calculation of the concrete thermal treatment modes

2018 ◽  
Vol 193 ◽  
pp. 03010 ◽  
Author(s):  
Sergey Sinenko ◽  
Boris Zhadanovskiy
Keyword(s):  
Energy Efficiency ◽  
Temperature Field ◽  
Reinforced Concrete ◽  
Thermal Treatment ◽  
Computer Software ◽  
Concrete Technology ◽  
Construction Operations ◽  
Efficiency Criterion ◽  
Environmental Friendliness ◽  
Temperature Field Model

The article provides guidelines on calculation of the cast-in-place reinforced concrete thermal treatment modes: the problem of thermal treatment mode by setting the mathematical temperature field model in the hardening concrete has been solved; model equation which allows calculating the temperature field in the hardening concrete structure using computer software has been solved numerically. One of the most pressing social problems in the world is the problem of housing for citizens, towards whom the state has obligations in accordance with applicable law. Currently, the most efficient way to solve this problem directly is a mechanism of provision of housing at the expense of state funds. Successful completion of such programs is also achieved due to the formation of an affordable economy class housing market that meets the requirements of energy efficiency and environmental friendliness. In turn, the energy efficiency criterion is achieved by rational choice of technology and organization of construction operations. An important criterion for energy efficiency of cast reinforced concrete technology utilization is the rational temperature condition of concrete hardening.

Acid and Alkali Pre-treatment Effects on CO2 Assisted Gasification of Pine Wood

2021 ◽  
pp. 1-20
Author(s):  
Jinhu Li ◽  
Kiran Raj Goud Burra ◽  
Zhiwei Wang ◽  
Xuan Liu ◽  
Ashwani K. Gupta
Keyword(s):  
Energy Efficiency ◽  
Alkali Treatment ◽  
Batch Reactor ◽  
Energy Output ◽  
Energy Yield ◽  
Boudouard Reaction ◽  
Acid Pretreatment ◽  
Pine Wood ◽  
Co2 Gasification ◽  
Pre Treatment

Abstract Biomass gasification in CO2 is a promising thermochemical pathway to help assist with growing issues of CO2 in the environment. However, high reaction temperature requirement and low reaction rate is limiting its development. To resolve these issues, the effect of acid and alkali pre-treatment on the pyrolysis and CO2-gasification of pine wood was examined using a semi-batch reactor. The temporal behavior of syngas components, energy, and their yield, and energy efficiency was quantified. Results showed that while acid pretreatment of biomass with lower alkali and alkaline earth metals (AAEMs) content was beneficial for the CO and syngas yield, the alkali pretreatment with higher AAEM content showed the opposite trend. In contrast, the CO2 assisted gasification of alkali pretreated biomass improved the CO and syngas yield due to catalytic influence of AAEM on the Boudouard reaction, while the acid washed biomass yielded the lowest syngas yield. During gasification, the syngas yield, energy yield and overall energy efficiency were enhanced by 83.44 %, 44.64 % and 44.58 %, respectively using alkali treatment. The results revealed that alkali pre-treatment is an effective catalytic incorporation pathway to improve the syngas, energy output, and reactivity to CO2 gasification.

Prediction of Temperature in Buildings using Machine Learning Techniques

2016 ◽  
pp. 314-333
Author(s):  
Juan José Carrasco ◽  
Juan Caravaca ◽  
Mónica Millán-Giraldo ◽  
Gonzalo Vergara ◽  
José M. Martínez-Martínez ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Prediction Models ◽  
Economic Benefits ◽  
Machine Learning Techniques ◽  
Field Energy ◽  
Climate Control ◽  
Learning Techniques ◽  
Temperature Forecasting ◽  
Planning Strategies ◽  
Temporal Horizon

Energy efficiency is a trend due to ecological and economic benefits. Within this field, energy efficiency in buildings sector constitutes one of the main concerns due to the fact that approximately 40% of total world energy consumption corresponds to this sector. Climate control in buildings has the potential to increase its energy efficiency planning strategies for the heating, ventilation and air conditioning (HVAC) machines. These planning strategies may include a stage for long term indoor temperature forecasting. This chapter entails the use of four prediction models (NAÏVE, MLR, MLP, FIS and ANFIS) to forecast temperature in an office building using a temporal horizon of several hours. The obtained results show that the MLP outperforms the other analyzed models. Finally, the obtained predictors are deeply analyzed to obtain information about the influence of the HVAC settings in the building temperature.

Supercritical carbon dioxide enhanced pre-treatment of cotton stalks for methane production

Energy ◽  
2020 ◽  
Vol 194 ◽  
pp. 116903 ◽  
Author(s):  
Rafat Al Afif ◽  
Martin Wendland ◽  
Thomas Amon ◽  
Christoph Pfeifer
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Methane Production ◽  
Cotton Stalks ◽  
Pre Treatment ◽  
Supercritical Carbon

scholarly journals Factors Associated with Energy Efficiency of Focused Ultrasound Through the Skull: A Study of 3D-Printed Skull Phantoms and Its Comparison with Clinical Experiences

2021 ◽  
Vol 9 ◽  
Author(s):  
Chanho Kong ◽  
So Hee Park ◽  
Jaewoo Shin ◽  
Hee Gyu Baek ◽  
Juyoung Park ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Trabecular Bone ◽  
Focused Ultrasound ◽  
Density Ratio ◽  
Sound Field ◽  
Field Energy ◽  
Clinical Experiences ◽  
Ultrasonic Sound ◽  
3D Printed ◽  
Ultrasound Energy

While focused ultrasound (FUS) is non-invasive, the ultrasound energy is attenuated by the skull which results in differences in energy efficiency among patients. In this study, we investigated the effect of skull variables on the energy efficiency of FUS. The thickness and density of the skull and proportion of the trabecular bone were selected as factors that could affect ultrasound energy transmittance. Sixteen 3D-printed skull models were designed and fabricated to reflect the three factors. The energy of each phantom was measured using an ultrasonic sound field energy measurement system. The thickness and proportion of trabecular bone affected the attenuation of transmitted energy. There was no difference in the density of the trabecular bone. In clinical data, the trabecular bone ratio showed a significantly greater correlation with dose/delivered energy than that of thickness and the skull density ratio. Currently, for clinical non-thermal FUS, the data are not sufficient, but we believe that the results of this study will be helpful in selecting patients and appropriate parameters for FUS treatment.

Study on Major Field Energy Efficiency Testing Techniques for Buildings in Regions that are Hot in Summer and Cold in Winter

2013 ◽  
Vol 368-370 ◽  
pp. 1278-1284
Author(s):  
Xue Fang Bao
Keyword(s):  
Energy Efficiency ◽  
Residential Building ◽  
Field Testing ◽  
Building Energy ◽  
Building Envelope ◽  
Field Energy ◽  
Building Energy Efficiency ◽  
Thermal Bridge ◽  
Current State ◽  
Thermal Defect

Building energy efficiency testing is an important way to verify whether buildings have measured up to energy efficiency design criteria. On the basis of current state of energy efficient building and construction in regions that are hot in summer and cold in winter, this paper makes an attempt at the analysis of key factors of residential building energy efficiency tests, and focuses on the technical points of field testing on heat transfer coefficient, thermal bridge, thermal defect of residential building envelope as well as room air tightness.

WAYS TO IMPROVE ENERGY EFFICIENCY IN CIVIL BUILDINGS

2021 ◽  
Vol 4 (2) ◽  
pp. 9-12
Author(s):  
Oybek G‘oyibov ◽  
◽  
Shaxram Xaydarov
Keyword(s):  
Energy Efficiency ◽  
Temperature Field ◽  
Fuel Consumption ◽  
Thermal Characteristics ◽  
Outer Wall ◽  
Primary Energy ◽  
Innovative Technologies ◽  
Improve Energy Efficiency ◽  
Resource Material ◽  
Unconventional Resource

As a result of theoretical and experimental experiments carried out in this research paper, specificaspects of the temperature field in the parts of the canopy in terms of the thermal characteristics of its outer wall for improving energy efficiency in civil buildings are determined. Also, taking into account the fact that there is currently an increased demand for energy in buildings, it is advisable to use new innovative technologies. Therefore, this conducted experiment gave a positive result.Keywords:heat, insulation, ventilation, primary energy, external barriers, reserve, unconventional, resource, material, capacity, demand, fuel, consumption, air, indicator

scholarly journals Organosolv Plus Supercritival Carbon Dioxide Pre-Treatment of Cotton Stalks for Methane Production

2017 ◽  
Author(s):  
Rafat Al Afif ◽  
Martin Wendland ◽  
Lutz Christian Krapf ◽  
Thomas Amon ◽  
Christoph Pfeifer
Keyword(s):  
Carbon Dioxide ◽  
Methane Production ◽  
Cotton Stalks ◽  
Pre Treatment
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