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ARTICLE

L. Krambeck¹, G. A. Bartmeyer¹, D. O. Souza², D. Fusão¹, P. H. D. Santos², T. Antonini Alves^1,*
Energy Engineering, Vol.118, No.1, pp. 1-14, 2021, DOI:10.32604/EE.2020.013572
Abstract The temperature control in electronic packaging is the key in numerous applications, to avoid overheating and hardware failure. Due to high capability of heat transfer, good temperature uniformity, and no power consumption, heat pipes can be widely used for heat dissipation of electronic components. This paper reports an experimental thermal analysis of different capillary structures for heat pipes. The wicks considered are metal screens, axial microgrooves, and sintered metal powder. The heat pipes are made of copper, a 200 mm length tube and a 9.45 mm external diameter. Working fluid used was distilled water. The devices are investigated in three… More >

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ARTICLE

T. Ahmed¹, S. Hassan^1,2, M. F. Hasan³, M. M. Molla^1,2,*, M. A. Taher⁴, S. C. Saha⁵
Energy Engineering, Vol.118, No.1, pp. 15-36, 2021, DOI:10.32604/EE.2020.011237
Abstract The magneto-hydrodynamics (MHD) effect is studied at different inclined angles in Rayleigh-Bénard (RB) convection inside a rectangular enclosure using the lattice Boltzmann method (LBM). The enclosure is filled with electrically conducting fluids of different characteristics. These characteristics are defined by Prandtl number, Pr. The considered Pr values for this study are 10 and 70. The influence of other dimensionless parameters Rayleigh numbers Ra = 10³; 10⁴; 10⁵; 10⁶ and Hartmann numbers Ha = 0, 10, 25, 50, 100, on fluid flow and heat transfer, are also investigated considering different inclined angles φ of magnetic field by analyzing computed local Nusselt… More >

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ARTICLE

Ying Chen, Jianfeng Pan^*, Qingbo Lu, Yu Wang, Chenxin Zhang
Energy Engineering, Vol.118, No.1, pp. 37-52, 2021, DOI:10.32604/EE.2020.013349
Abstract The effects of inlet gas parameters and sloping sidewall angle on the flame structure and combustion limit with and without sidewall were experimentally investigated. Flame height and impact angle were obtained by chemiluminescence intensity analysis of CH* distribution. First, the combustion characteristics of flame with and without sidewall at different equivalence ratios were explored; then, the influence of Reynolds number and inlet gas temperature on flame structure and combustion limit of v-shaped flame with sidewall were analyzed, and the results with sidewall were compared with those without sidewall. Finally, the variation trend of flame parameters with different sloping sidewall angles… More >

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ARTICLE

Hongchun Shu^1,2, Xiaohan Jiang^1,2,*, Pulin Cao², Na An², Xincui Tian², Bo Yang²
Energy Engineering, Vol.118, No.1, pp. 53-71, 2021, DOI:10.32604/EE.2020.012381
（This article belongs to the Special Issue: Wind Energy Development and Utilization)
Abstract The system impedance instability, high-order harmonics, and frequency offset are main fault characteristics of wind power system. Moreover, the measurement angle of faulty phase is affected by rotation speed frequency component, which causes traditional directional protections based on angle comparison between voltage and current to operate incorrectly. In this paper, a time-domain protection for connected to wind power plant based on model matching is proposed, which compares the calculated current and the measured current to identify internal faults and external faults. Under external faults, the calculated current and measured current waveform are quite similar because the protected transmission lines is… More >

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ARTICLE

Yanju Wei^1,*, Jie Zhang¹, Shengcai Deng¹, Yajie Zhang¹, Yajing Yang², Hao Chen³
Energy Engineering, Vol.118, No.1, pp. 73-87, 2021, DOI:10.32604/EE.2020.012482
（This article belongs to the Special Issue: Sustainable energy for transport)
Abstract The diffusion of fuel spray in swirl flow is vital for the combustion of diesel engine, however, the researches on this is still mysterious due to the obstacles on direct investigations on a real engine. The research of intake swirl in engine at present normally use CFD simulation or based on data analysis of combustion and exhaust emission, the specific mixing process of fuel in swirl flow still not very clear. In this paper, a rapid compression machine (RCM) with an optical combustion chamber was established with the mean compression velocity of 7.55 m/s. Three kinds of flow fields, including… More >

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ARTICLE

Xiang Xiao¹, Wei Zhao¹, Wei Wang¹, Wei Zhang¹, Xianbiao Bu², Lingbao Wang^2,*, Huashan Li²
Energy Engineering, Vol.118, No.1, pp. 89-101, 2021, DOI:10.32604/EE.2020.014016
（This article belongs to the Special Issue: Advanced Heat Pump Technologies for Renewable Energy Utilization)
Abstract Solar energy powered organic Rankine cycle vapor compression cycle (ORC-VCC) is a good alternative to convert solar heat into a cooling effect. In this study, an ORC-VCC system driven by solar energy combined with electric motor is proposed to ensure smooth operation under the conditions that solar radiation is unstable and discontinuous, and an office building located in Guangzhou, China is selected as a case study. The results show that beam solar radiation and generation temperature have considerable effects on the system performance. There is an optimal generation temperature at which the system achieves optimum performance. Also, as a key… More >

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REVIEW

Shi-er Dong¹, Yiqing He^1,*, Jingya Dong², Zhouyu Peng³, Guohua Fu³
Energy Engineering, Vol.118, No.1, pp. 103-118, 2021, DOI:10.32604/EE.2020.012362
Abstract Based on the analysis of the whole process of LNG spill on land, the research methods of LNG pool expansion and heavy gas diffusion are summarized and analyzed. This paper reviews the experimental and analytical work performed to data on spill of LNG. Specifically, experiments on the spill of LNG onshore, as well as experiments and numerical study on heavy gas dispersion. Pool boiling and turbulence model are described and discussed, as well as models used to predict dispersion. Although there have been significant progress in understanding the behavior of LNG spills, technical knowledge gaps to improve hazard prediction are… More >

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Zhiqiang Pan¹, Zhiwen Lin¹, Kunle Fan², Cheng Yang^2,*, Xiaoqian Ma²
Energy Engineering, Vol.118, No.1, pp. 119-141, 2021, DOI:10.32604/EE.2020.013585
Abstract Gas turbine power units, as an effective way to cope with the severe challenge of renewable energy accommodation in power grids, arouse the interest of power enterprises in the deep peak-load regulation performance. Two common alternative load-control strategies including constant turbine inlet temperature (TIT) and constant turbine exhaust temperature (TET) regulations were taken into consideration. To comparatively investigate the part-load performance under these strategies, both mathematical and physical models were set up successively to serve as a validation and complementary to each other. For the mathematical model of compressor with inlet guide vane (IGV), combustor and turbine, stage-stacking method based… More >

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Mei Song^1,2,*, Liyan Zhang¹, Mingxin Zhang^1,*, Dandan Li¹, Yaxu Zhu¹
Energy Engineering, Vol.118, No.1, pp. 143-161, 2021, DOI:10.32604/EE.2020.013834
（This article belongs to the Special Issue: Energy Systems Management and Climate Change)
Abstract Coordinated development of new high-tech industries and traditional industries is crucially important for economic growth and environmental sustainability, and it has become a focus of academic and governmental bodies. This study establishes the comprehensive evaluation index system of high-tech industries and traditional industries, and uses the method of principal component analysis, coupling and coupling coordination degree model to determine the level of industry coordinated development. Then, Pearson correlation test is used to further analyze the correlation between regional industrial coupling coordination and carbon intensity of the seven provinces in the Bohai Rim Economic Circle (BREC). The results are as follows.… More >

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ARTICLE

Shusheng Xiong¹, Qiujie Song¹, Wei Li^2,*, Lian Xie³
Energy Engineering, Vol.118, No.1, pp. 163-172, 2021, DOI:10.32604/EE.2020.013410
Abstract Based on the principles of heat transfer, an oil film model in the engine cylinder was established. Under the condition of cold state, the influence of factors such as engine fuel injection, fuel drop point, cylinder inner wall temperature, and inlet fluid on the oil film is comprehensively considered to establish an oil film quality prediction model. Based on the measurement of the compensation oil quantity in the transition conditions, the variation of the oil film during the transition is analyzed. The experimental results show that the velocity of the airflow in the intake port and the temperature and pressure… More >

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ARTICLE

Qin Liu^*, Ruliang Zhang
Energy Engineering, Vol.118, No.1, pp. 173-187, 2021, DOI:10.32604/EE.2020.012788
Abstract With the continuous advancement of economic globalization, energy demand is expanding and energy consumption is excessive, which leads to energy shortage. Unreasonable energy use also brings great challenges to the environment and affects the balance of the ecosystem seriously. The rise of the third industrial revolution has injected new vitality into energy system. The construction of energy Internet system, which integrates Internet technology and energy technology, has become a new energy system of sustainable development. It has put forward the reform scheme for the mismatch of energy demand points and environmental pollution. The deepening of sustainable development strategy accelerates the… More >

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1059

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ARTICLE

Riina Syivarulli^1,2, Nugroho Agung Pambudi^2,*, Mochamad Syamsiro³, Lip Huat Saw⁴
Energy Engineering, Vol.118, No.1, pp. 189-197, 2021, DOI:10.32604/EE.2020.010493
Abstract One of the major problems faced in managing biomass waste to higher quality products is choosing the right technology. Wastes are used as an alternative fuel, with increase in the calorific value. Hydrothermal carbonization (HTC) is a biomass conversion technology, used to obtain solid fuel. This study aims to utilize of Calophyllum inophyllum as an alternative solid fuel through HTC. The calorific value and proximate of the hydrochar will be determined and analyzed to find out its quality. The experiments were carried out at temperature variations of 160°C, 190°C, and 220°C and holding times of 30 and 60 minutes. The… More >

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