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木本植物燃烧过程的热能平衡分析 被引量:3
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作者 张景群 王得祥 +1 位作者 吴宽让 周新华 《东北林业大学学报》 CAS CSCD 北大核心 1998年第5期34-38,共5页
在森林可燃物预引燃所需最小能量的基础上,经进一步对燃烧过程进行分析,提出了木本植物燃烧的热能平衡方程,并对14种木本植物试样在同一标准下进行了测定和分析。结果表明,燃烧过程的热能平衡方程可应用于植物燃烧性评判;各森林... 在森林可燃物预引燃所需最小能量的基础上,经进一步对燃烧过程进行分析,提出了木本植物燃烧的热能平衡方程,并对14种木本植物试样在同一标准下进行了测定和分析。结果表明,燃烧过程的热能平衡方程可应用于植物燃烧性评判;各森林类型的火险级评定以总体平均含水率、细小可燃物总载量为优先指标。 展开更多
关键词 木本植物 燃烧过程 热能平衡方程
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Near ground air temperature calculation model based on heat transfer of vertical turbulent and horizontal air flow
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作者 张磊 孟庆林 《Journal of Central South University》 SCIE EI CAS 2012年第3期721-726,共6页
In order to calculate the air temperature of the near surface layer in urban environment,the surface layer air was divided into several sections in the vertical direction,and some energy balance equations were develop... In order to calculate the air temperature of the near surface layer in urban environment,the surface layer air was divided into several sections in the vertical direction,and some energy balance equations were developed for each air layer,in which the heat exchange due to vertical turbulence and horizontal air flow was taken into account.Then,the vertical temperature distribution of the surface layer air was obtained through the coupled calculation using the energy balance equations of underlying surfaces and building walls.Moreover,the measured air temperatures in a small area(with a horizontal scale of less than 500 m) and a large area(with a horizontal scale of more than 1 000 m) in Guangzhou in summer were used to validate the proposed model.The calculated results accord well with the measured ones,with a maximum relative error of 4.18%.It is thus concluded that the proposed model is a high-accuracy method to theoretically analyze the urban heat island and the thermal environment. 展开更多
关键词 turbulent heat exchange urban thermal environment near surface layer air temperature calculation model
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Analysis by Indicators Performance of the Conceptual Structures mCCHP-SE Using Renewable Energy Sources
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作者 Nicolae Badea Marcel Oanca Ion Paraschiv Ion Voncila 《Journal of Energy and Power Engineering》 2012年第10期1597-1604,共8页
This paper refers to an integrated mCCHP (micro-combined cooling heat and power) systems dedicated for isolated residents with energetic independence. The only energy sources are wood pellet and solar energy. The pr... This paper refers to an integrated mCCHP (micro-combined cooling heat and power) systems dedicated for isolated residents with energetic independence. The only energy sources are wood pellet and solar energy. The proposed trigeneration system is based on mCHP (micro-combined heat and power) unit with Stirling engine, photovoltaic panels, thermal solar collector and pellet boiler. The proposed mCCHP system utilizes the exceeding amount of heat in the summer for producing the necessary cooling. A residential building with known energy consumption is determined load curves that must be covered by mCCHP system. The paper analyzes four structures of trigeneration systems with thermal activation chiller and two structures of trigeneration systems with mechanical compression chiller. Performance indicators are determined based on energy balance equations for each variant. It compares the performances and establishes the best option. 展开更多
关键词 MICROGENERATION TRIGENERATION residential building renewable energy.
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Lattice Boltzmann Simulation of Mixed Convection Heat Transfer in a Driven Cavity with Non-uniform Heating of the Bottom Wall
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作者 Soufiene Bettaibi Ezeddine Sediki +1 位作者 Frdric Kuznik Sauro Succi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第1期91-100,共10页
The goal of this article is to study numerically the mixed convection in a differentially heated rid-driven cavity with non-uniform heating of the bottom wall. The velocity field is solved by a hybrid scheme with mult... The goal of this article is to study numerically the mixed convection in a differentially heated rid-driven cavity with non-uniform heating of the bottom wall. The velocity field is solved by a hybrid scheme with multiple relaxation time Lattice Boltzmann (MRT-LBM) model, while the temperature field is obtained by resolution of the energy balance equation using the finite difference method (FDM). First, the model is checked and validated using data from the riterature. Validation of the present resuJts with those available in the literature shows a good agreement. A good efficiency in time simulation is confirmed. Thereafter, the model has been applied to mixed convection in a driven cavity with non-uniform heating wall at the fixed Grashof number Gr = 106. It is found that, the heat transfer is weakened as the Richardson number is augmented. For Gr = 106, we note the appearance of secondary vortices at different positions of the cavity corners. 展开更多
关键词 lattice Boltzmann method (LBM) finite difference method (FDM) heated Lid-driven cavity mixed convection non-uniform heating wall
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