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Spatio-temporal reconstruction of air temperature maps and their application to estimate rice growing season heat accumulation using multi-temporal MODIS data

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第2期14卷 144-161页

作者： Li-wen ZHANG Jing-feng HUANG Rui-fang GUO Xin-xing LI Wen-bo SUN Xiu-zhen WANG Institute of Remote Sensing and Information Application Zhejiang University Key Laboratory of Polluted Environment Remediation and Ecological Health Ministry of EducationCollege of Natural Resources and Environmental ScienceZhejiang University Key Laboratory of Agricultural Remote Sensing and Information System of Zhejiang Province Meteorological Information Technology Support Center of Jilin Province Institute of Remote Sensing and Earth Sciences Hangzhou Normal University

The accumulation of thermal time usually represents the local heat resources to drive crop *** of temperature-based agro-meteorological indices are commonly generated by the spatial interpolation of data collected from meteorological stations with coarse geographic *** solve the critical problems of estimating air temperature(T a) and filling in missing pixels due to cloudy and low-quality images in growing degree days(GDDs) calculation from remotely sensed data,a novel spatio-temporal algorithm for T a estimation from Terra and Aqua moderate resolution imaging spectroradiometer(MODIS) data was *** is a preliminary study to calculate heat accumulation,expressed in accumulative growing degree days(AGDDs) above 10 ℃,from reconstructed T a based on MODIS land surface temperature(LST) *** verification results of maximum T a,minimum T a,GDD,and AGDD from MODIS-derived data to meteorological calculation were all satisfied with high correlations over 0.01 significant ***,MODIS-derived AGDD was slightly underestimated with almost 10% relative ***,the feasibility of employing AGDD anomaly maps to characterize the 2001-2010 spatio-temporal variability of heat accumulation and estimating the 2011 heat accumulation distribution using only MODIS data was finally demonstrated in the current *** study may supply a novel way to calculate AGDD in heat-related study concerning crop growth monitoring,agricultural climatic regionalization,and agro-meteorological disaster detection at the regional scale.

关键词： MODIS land surface temperature Air temperature estimation Reconstruction heat accumulation Rice growing season Growing degree day (GDD)

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Thermal Inertia of 330 MW Circulating Fluidized Bed Boiler during Load Change

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Journal of Thermal Science 2023年第5期32卷 1771-1783页

作者： SUN Guorui WU Haowen LIU Shangzhong LIU Tonghua LIU Jixiang YANG Hairui ZHANG Man Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Wuhan Yongping Science and Technology Co.Ltd. Wuhan 430000China

The operating principles of Circulating Fluidized Bed(CFB)boilers involve a significant amount of heat accumulation,which forms the thermal inertia of the boiler and hinders the improvement of its variable load response *** study aims to characterize the thermal inertia of CFB boilers by evaluating the change in the boiler's heat accumulation corresponding to the change in unit power *** thermal inertia of a 330MW CFB boiler was determined through the collection of operating data under four different operating conditions of 30%,50%,75%,and 100%*** study proposes to substitute the existing refractory material with a metal grille to reduce the thermal inertia of the *** effect of the metal grille on heat transfer was confirmed through verification on a 440 t/h CFB boiler,and its performance change and thermal inertia reduction were further *** results indicate that over 50%of the total thermal inertia of CFB boilers originates from the refractory *** use of metal grille in place of refractory material improved heat transfer in the furnace,resulting in a decrease of the furnace chamber temperature by 13℃in the 330 MW CFB *** reduction of thermal inertia by 30%-35%will facilitate faster load lifting and lowering of the boiler,fulfilling the requirement for flexible peaking.

关键词： CFB boiler refractory thermal inertia heat accumulation

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Super-high bed sintering for iron ores: inhomogeneous phenomena and its mechanism during mineralizing

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Journal of Iron and Steel Research International 2024年第8期31卷 1850-1860页

作者： Hui-bo Liu Liang-ping Xu Xi-duan Yang Zhong-lin Dong Qiang Zhong Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

The inhomogeneous sinter properties in super-high bed sintering have been reported in our previous *** inves-tigate the reasons for the inhomogeneous phenomena,detailed sampling and analysis of mixed material bed and sintered bed in super-high bed sintering plant were *** results indicated that the higher porosity and thinner dendrite of silico-ferrite of calcium and aluminum in the upper layer as well as dense structure and higher secondary hematite content in the lower layer led to the heterogeneities of mechanical strength and reduction properties exceeding 20%and 10%,*** the bed top downward,the basicity of mixed material decreased from 2.13 to 1.68 because the average particle size increased from 2.65 to 4.56 *** and fuels gathered in finer particles(-3 mm)of mixed material,and the-3 mm particles of mixed material generated more liquid phase than+3 mm *** heat input of super-high sintering bed was inhomogeneous due to the heat accumulation effect and unreasonable fuel *** inhomo-geneous sintering heat condition in sintering bed resulted in the different quantities and properties of liquid *** inhomogeneous quantities and properties of liquid phase that were influenced by inhomogeneous distribution of chemical composition,particle size,and heat input led to inhomogeneous mineralizing *** mineralizing condition is the key for homogeneous super-high bed sintering.

关键词： Iron ore Super-high bed sintering Mineralization Material segregation heat accumulation

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Optimal Periodic Control of Hypersonic Cruise Vehicle 36

Optimal Periodic Control of Hypersonic Cruise Vehicle

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第36届中国控制会议

作者： Wang Wenkai Hou Zhongxi Shan Shangqiu Guo Tianhao Chen Lili College of Aerospace Science and Technology National University of Defense Technology

ISBN: (纸本)9781538629185

Object of this work is hypersonic cruise vehicle which cruises at Mach number beyond 5 in atmosphere. Range of this vehicle is often restricted by the poor aerodynamic, propulsive and structural performances and severe persistent aerodynamic heating. To extend its range, optimal periodic cruise trajectory has been adopted herein to improve fuel efficiency and remit heat accumulation. The performance measure is a weighted combination of the two factors. The simulations show that the two factors are mutually contradicted with variation of weighting factor, and that improvement of aerodynamic heating is much more distinct than that of fuel efficiency. The study on single period is helpful to design the whole flight envelop in future research.

关键词： Hypersonic cruise vehicle Fuel efficiency heat accumulation Optimal periodic cruise trajectory

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A Cogeneration System for an Apartment Building Based on Distributed heat Storage Technology

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Journal of Energy and Power Engineering 2010年第12期4卷 9-16页

作者： H. Morita H. Yamaguchi Y. Kiuchi Y. Hisazumi Energy Technology Laboratories Osaka Gas Co. Ltd. 19-9 Torishima 6-Chome Konohana-Ku Osaka 554-0051 Japan Department of Mechanical Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan

In order for economically viable distributed generation systems for apartment buildings to spread, it is essential to develop an efficient and low-cost heat supply system. We have developed a new eogeneration system called the Neighboring Cogeneration system （NCG）. The key concept of this system is to install a heat accumulator with a hot water supply and a room heating function at each household and to connect different households by a single loop of hot water pipe. As a result, time leveling of the heat supply and heat transferring among households becomes possible. Thus, the costs of the pipe and the heat source equipment decrease. Furthermore, because all of the heat accumulators store heat, the total heat storage capacity is large enough for cogeneration to generate exhaust heat according to the electricity demand and with a high operating rate. In this paper, we report the results of the NCG system for 7 lived-in households. The controlling system worked efficiently. All of the households were able to use hot water without any difficulties. Further, we report the results of the energy saving effect of the NCG system for 50 lived-in households by means of a simulation based on the experimental results for NEXT21.

关键词： Cogeneration heat distribution heat accumulation dynamic simulation.

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