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SIMPLE NONLINEAR OPTIMIZATION-baseD SELECTION OF INSULATION MATERIAL AND WINDOW TYPE IN TURKEY:EFFECT OF HEATING AND COOLING base temperatureS

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Journal of Green Building 2017年第2期12卷 79-94页

作者： Fehmi GörkemÜçtuğ Semra Ağralı School of Chemical Engineering and Analytical Science The University of ManchesterManchesterUKM139PL Department of Industrial Engineering MEF University34396SarıyerİstanbulTurkey

The energy-savings of four hypothetical households in different climatic regions of Turkey were calculated via a nonlinear mixed integer optimization *** ideal insulation material,its optimum thickness,and the ideal window type were *** standard degree days method was used with five different base temperatures for heating and five different base temperatures for *** climatic conditions of the region,the properties of the insulation options,the unit price of fuel and electricity and the base temperature are used as model inputs,whereas the combination of selected insulation material with its optimum thickness and window type are given as model *** Wool was found to be the ideal wall insulation material in all *** optimum window type was found to depend on the heating or cooling requirements of the house,as well as the lifetime of *** region where the energy saving actions are deemed most feasible has been identified as Erzurum(Region 4),followed by Antalya(Region 1).Finally,the effect of changing the base temperature on energy savings was investigated and the results showed that an approximate average increase of$15/℃ in annual savings is *** model can be used by any prospective home-owner who would like to maximize their energy savings.

关键词： base temperature Degree days method HVAC systems Insulation thickness Nonlinear mixed-integer programming Optimization

Investigation of the Behavior of a Photovoltaic Cell under Concentration as a Function of the temperature of the base and a Variable External Magnetic Field in 3D Approximation

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Smart Grid and Renewable Energy 2023年第12期14卷 209-220页

作者： Boubacar Soro Adama Ouedraogo Mahamadi Savadogo Ramatou Konate Guyserge Tchouadep Martial Zoungrana Sié Kam Laboratory of Thermal and Renewable Energies Department of Physics Université Joseph Ki-Zerbo Ouagadougou Burkina Faso Institutdes Sciences et Technologie Ecole Normale Supérieure Ouagadougou Burkina Faso Centre Universitaire Polytechnique de Kaya Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

The photovoltaic (PV) cell performances are connected to the base photogenerated carriers charge. Some studies showed that the quantity of the photogenerated carriers charge increases with the increase of the solar illumination. This situation explains the choice of concentration PV cell (C = 50 suns) in this study. However, the strong photogeneration of the carriers charge causes a high heat production by thermalization, collision and carriers charge braking due to the electric field induced by concentration gradient. This heat brings the heating of the PV cell base. That imposes the taking into account of the temperature influence in the concentrator PV cell operation. Moreover, with the proliferation of the magnetic field sources in the life space, it is important to consider its effect on the PV cell performances. Thus, when magnetic field and base temperature increase simultaneously, we observe a deterioration of the photovoltage, the electric power, the space charge region capacity, the fill factor and the conversion efficiency. However the photocurrent increases when the base temperature increases and the magnetic field strength decreases. It appears an inversion phenomenon in the evolution of the electrical parameters as a function of magnetic field for the values of magnetic field B> 4×10-4 T.

关键词： Thermalization base temperature Magnetic Field Fill Factor Efficiency Space Charge Region Capacity

Introducing Degree Days to Building Thermal Climatic Zoning in China

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Journal of Thermal Science 2023年第3期32卷 1155-1170页

作者： LIU Yan WEN Zeqiu LYU Kailin YANG Liu LIU Jiaping DONG Hong GAO Qinglong State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China School of Architecture Xi'an University of Architecture and TechnologyXi'an 710055China China Academy of Building Research Beijing 100013China China Southwest Architectural Design and Research Institute corp.Ltd. Chengdu 610041China

Building thermal climatic zoning is a key issue in building energy *** degree days(HDD) and cooling degree days(CDD) are often employed as indexes to represent the heating and cooling energy demand in climatic ***,only using degree days may oversimplify the climatic zoning in regions with complex climatic *** the present study,the application of degree days to current building thermal climatic zoning in China was assessed based on performance *** investigate the key indexes for thermal climatic zoning,the climate characteristics of typical cities were analyzed and the relationships between the climate indexes and heating/cooling demand were *** results reveal that the annual cumulative heating load had a linear correlation with HDD 18 only in regions with small differences in ***,HDD is unsuitable for representing the heating demand in regions with large differences in altitude.A comprehensive index(winter climatic severity index) should be employed instead of HDD,or complementary indexes(daily global solar radiation or altitude) could be used to further divide climate *** the current official climatic zoning,the base temperature of 26℃ for CDD is excessively *** appropriate base temperature range is 18℃ to 22℃.This study provides a reference for selecting indexes to improve thermal climatic zoning in regions with similar climates.

关键词： climatic zoning degree days building thermal design base temperature solar radiation

Investigating the Impact of base Heating and External Electric Field on PV Cell Performance under Intense Illumination

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Open Journal of Applied Sciences 2024年第5期14卷 1305-1314页

作者： Boubacar Soro Guy Serge Tchouadep Esso-Ehanam Tchedre Kpeli Ousmane Souliga Adama Ouedraogo Issa Zerbo Martial Zoungrana Laboratory of Thermal and Renewable Energies Universit&#233 Joseph KI-ZERBO Ouagadougou Burkina Faso Institut des Sciences et Technologie Ecole Normale Sup&#233rieure Ouagadougou Burkina Faso

The characterization of the performances of a PV cell is linked to intrinsic factors of this cell. It is therefore important for us to identify the favorable or unfavorable conditions that affect the performance of PV cells. It is from this perspective that it seems judicious to us to study the simultaneous influence of the heating of the base and an external electric field on the performance of a PV cell under intense illumination of 50 suns. Two phenomena contribute to the heating of the base of a PV cell which is heating due to the transfer by conduction of solar radiation energy received by the surface of the PV cell and the heat generated inside the PV cell by various phenomena linked to the movement of photogenerated charged carriers. In this study, we take into account the heating linked to the movement of the charged carriers in the base. After a mathematical modeling of the PV cell considered, some hypotheses are formulated and the expressions of the electrical parameters are established as a function of the electric field and base temperature. Subsequently, we use numerical simulation to highlight the behavior of theses parameters as a function of temperature and of the intensity of the electric field. The results show that for any given temperature, the orientation of the electric field as considered in our work improves the performance of the PV cell while high temperatures degrade these performances. Furthermore, the analysis of the curves shows that the harmful effect of temperature on the performance of a PV cell is more accentuated at large values of electric field.

关键词： Collisions Thermalization Braking Electric Strength base temperature

An optimized solar-air degree-day method to evaluate energy demand for poultry buildings in different climate zones

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Frontiers of Agricultural Science and Engineering 2020年第4期7卷 478-489页

作者： Yang WANG Baoming LI Department of Agricultural Structure and Bioenvironmental Engineering College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering Research Center for Animal Healthy Environment Beijing 100083China

The degree-day method is widely used to determine energy consumption but cannot be directly applied to poultry buildings without improvements in its *** study was designed to optimize the degreeday calculation and proposes a solar-air degree-day method,which can be used to calculate the cooling and heating degree-days and the annual cooling and heating loads under different climate conditions for poultry *** this paper,the solar-air degree-day method was proposed,which considers the effects of solar radiation with different wall orientations and surface *** Chinese cities,Harbin,Beijing,Chongqing,Kunming and Guangzhou,were selected to represent different climate zones to determine the solar-air *** heating and cooling energy requirements for different climates were compared by DeST(Designer’s Simulation Toolkit)simulation and the solar-air degreeday *** to decrease energy consumption were *** results showed that the maximum relative error was less than 10%,and the new method was not significantly different from the DeST simulation(P>0.05).The accuracy of calculating energy requirements was improved by the solar-air degree-day method in the different climate *** and surface color effects on energy consumption need to be considered,and external walls of different orientations should have different surface colors.

关键词： base temperature energy consumption solar radiation orientation surface color