Open Access
ARTICLE
L. Krambeck1, G. A. Bartmeyer1, D. O. Souza2, D. Fusão1, P. H. D. Santos2, T. Antonini Alves1,*
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 >
Open Access
ARTICLE
T. Ahmed1, S. Hassan1,2, M. F. Hasan3, M. M. Molla1,2,*, 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 >
Open Access
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 >
Open Access
ARTICLE
Hongchun Shu1,2, Xiaohan Jiang1,2,*, 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 this 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 >
Open Access
ARTICLE
Yanju Wei1,*, 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 this 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 >
Open Access
ARTICLE
Xiang Xiao1, Wei Zhao1, Wei Wang1, Wei Zhang1, Xianbiao Bu2, Lingbao Wang2,*, Huashan Li2
Energy Engineering, Vol.118, No.1, pp. 89-101, 2021, DOI:10.32604/EE.2020.014016
（This article belongs to this 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 >
Open Access
REVIEW
Shi-er Dong1, Yiqing He1,*, 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 >
Open Access
ARTICLE
Zhiqiang Pan1, Zhiwen Lin1, Kunle Fan2, Cheng Yang2,*, 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 >
Open Access
ARTICLE
Mei Song1,2,*, Liyan Zhang1, Mingxin Zhang1,*, Dandan Li1, Yaxu Zhu1
Energy Engineering, Vol.118, No.1, pp. 143-161, 2021, DOI:10.32604/EE.2020.013834
（This article belongs to this 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 >
Open Access
ARTICLE
Shusheng Xiong1, Qiujie Song1, Wei Li2,*, 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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