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Coupled EnergyPlus and computational fluid dynamics simulation for natural ventilation
2013
Building and Environment
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Can coupled Computational Fluid Dynamics (CFD) and Building Energy Simulation (BES) be used to conduct annual simulation? This paper tries to investigate the feasibility of annual coupled simulation of CFD and BES. Energy modeling approaches have continued to advance to cater for emerging new design concepts towards "greener" solutions that optimize energy consumption in buildings while maintaining thermal comfort as well as healthy environment. Various efforts have been made to improve the
doi:10.1016/j.buildenv.2013.04.002
fatcat:bb73ifivibfq7pdieddi7v5i34
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... lity of the thermal simulation in buildings such as to couple CFD with lumped nodal BES model. Research has shown that the coupled simulation improves simulation accuracy. However, due to the nature of CFD simulation, coupled simulation usually takes much longer computation time. For example, the annual simulation of natural ventilation, which has relatively fewer incidences of CFD simulation runs, would take up to 46 days. In addressing the issue, a coupled lumped heat transfer model (EnergyPlus) and CFD model (Fluent) was implemented, and 8 days of simulation was conducted. Delaunay Triangulation based interpolation model was built from the 8 days' results, which can be used to predict the airflow rates for openings for an annual simulation. It is shown that the interpolation model is able to predict 35% of the natural ventilation deployable time annually, when natural ventilation is appropriate in the Philadelphia climate context. The interpolation model reduces the simulation time by 90%.
Multiphysics modeling of a micro-scale Stirling refrigeration system
2013
International journal of thermal sciences
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A new micro-scale refrigeration system composed of arrays of silicon MEMS cooling elements that operate on the Stirling cycle has been designed. In this paper, we describe a multiphysics computational approach for analyzing the system performance that considers compressible flow and heat transfer with a large deformable mesh. The regenerator pressure drop and effectiveness are first explored to determine the optimal porosity. A value near 0.9 is found to maximize the coefficient of performance.
doi:10.1016/j.ijthermalsci.2013.07.003
fatcat:rbfvldhobferzja2hoqxwewwvu
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... To overcome the computational complexity brought about by the fine pillar structure in the regenerator, a porous medium model is used to allow for modeling of a full element. Parametric studies demonstrate the effect of the operating frequency on the cooling capacity and the coefficient of performance.
Micro-electro-mechanical systems (MEMS)-based micro-scale direct methanol fuel cell development
2006
Energy
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recently, a conceptual design of an integrated fluidic system for microscale DMFCs, including water management at the cathode, a micropump for water recycling, and a gas separation system, was proposed by Yao ...
doi:10.1016/j.energy.2005.10.016
fatcat:cavjxqquurhndae3xvacsl3bw4
Design of Stable Evaporative Micro-channel Systems Using Expanding Area
확장 면적을 이용한 안정된 증발 마이크로채널 시스템의 설계
2011
Transactions of the Korean Society of Mechanical Engineers B
확장 면적을 이용한 안정된 증발 마이크로채널 시스템의 설계
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Yao ** * 국민대학교 기계시스템공학부, ** 카네기멜론대학교 기계공학과 Design of Stable Evaporative Micro-channel Systems Using Expanding Area Hee Joon Lee * † and Shi-chune Yao ** * School of Mechanical Systems Engineering, Kookmin ...
위해 식 (1)에 식 (3)를 대입하면 식 (4)와 같이 확장 채널에서 정적 유동불안정성 계 수가 전개될 수 있다. ep f f fg g g ep forward back F A G A A A i Q F F F R + + = + = 이용한 안정된 증발 마이크로채널 시스템의 설계 이 희 준 * † · Shi-chune ...
doi:10.3795/ksme-b.2011.35.8.831
fatcat:qlt4v47rgrac5ikrrbydgghpcq
Design and modeling of a fluid-based micro-scale electrocaloric refrigeration system
2014
International Journal of Heat and Mass Transfer
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A refrigeration system composed of silicon MEMS cooling elements is designed based on the electrocaloric (EC) effect in a P(VDF-TrFE-CFE) terpolymer, poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) 59.2/33.6/7.2 mol%. Each cooling element includes two diaphragm actuators fabricated in the plane of a silicon wafer, which drive a heat transfer fluid back and forth across terpolymer layers that are placed between them. In the EC effect, reversible temperature and entropy changes
doi:10.1016/j.ijheatmasstransfer.2014.01.043
fatcat:jaugtkr43jh4jnxegdjmr7nu7i
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... lated to polarization changes appear in a material under the application and removal of an electric field. Finite element simulations are performed to explore the system performance. The effect of the applied electric field is studied, and the time lag between the electric field and the diaphragm motion is found to significantly affect the cooling power. A parametric study of the operating frequency, externally-applied temperature span, and the electric field amplitude are conducted. The results indicate that when the system is operated at a temperature span of 15 K, a cooling power density of 3 W/cm 2 and a percent of Carnot COP of 31% are achieved for one element.
An information-theoretic framework for optimal temperature sensor allocation and full-chip thermal monitoring
2012
Proceedings of the 49th Annual Design Automation Conference on - DAC '12
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Full-chip thermal monitoring is an important and challenging issue in today's microprocessor design. In this paper, we propose a new information-theoretic framework to quantitatively model the uncertainty of on-chip temperature variation by differential entropy. Based on this framework, an efficient optimization scheme is developed to find the optimal spatial locations for temperature sensors such that the full-chip thermal map can be accurately captured with a minimum number of on-chip
doi:10.1145/2228360.2228476
dblp:conf/dac/ZhouLCKQY12
fatcat:6kq5xt2dybfitf5dfsh3poakh4
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... In addition, several efficient numerical algorithms are proposed to minimize the computational cost of the proposed entropy calculation and optimization. As will be demonstrated by our experimental examples, the proposed entropy-based method achieves superior accuracy (1.4× error reduction) for full-chip thermal monitoring over prior art.
A mechanistic model of critical heat flux under subcooled flow boiling conditions for application to one- and three-dimensional computer codes
2010
Nuclear Engineering and Design
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., Yao, S.C., Amon, C.H., 2010. Two-phase flow regimes and mechanisms of critical heat flux under subcooled flow boiling conditions. Nucl. Eng. ...
doi:10.1016/j.nucengdes.2008.12.007
fatcat:a6gyd74eife5jjlexdxj45b3l4
The modeling of thin film heat exchangers
2018
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Technical Report
doi:10.1184/r1/6467567.v1
fatcat:foom4bdd4faz5o7hnjpperxisy
Transient behavior of condensing or evaporating films on horizontal tubes
2018
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Technical Report
doi:10.1184/r1/6467606
fatcat:hlrnz5ww2zgsveqk6p7dgwhv6i
Exploration of Impinging Water Spray Heat Transfer at System Pressures Near the Triple Point
2013
Volume 8B: Heat Transfer and Thermal Engineering
unpublished
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The heat transfer of a water spray impinging upon a surface in a very low pressure environment is of interest to cooling of space vehicles during launch and re-entry, and to industrial processes where flash evaporation occurs. At very low pressure, the process occurs near the triple point of water, and there exists a transient multiphase transport problem of ice, water and water vapor. At the impingement location, there are three heat transfer mechanisms: evaporation, freezing and sublimation.
doi:10.1115/imece2013-66872
fatcat:pt4ocrq3mfhnnki764lgnmrufe
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... preliminary heat transfer model was developed to explore the interaction of these mechanisms at the surface and within the spray.
EXPERIMENTAL STUDIES OF SPRAY DEPOSITION ON A FLAT SURFACE IN A VACUUM ENVIRONMENT
2016
Proceeding of First Thermal and Fluids Engineering Summer Conference
unpublished
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Cooling of spacecraft components in the space environment is an on-going research effort. The electronics used in modern spacecraft are always changing and the heat flux is increasing. New, one-of-a-kind missions require new approaches to thermal control. In this research, under vacuum conditions, a pulsed water spray impinged on a small disc, while a high speed data acquisition system recorded the temperature histories of this copper disc. The water droplets froze quickly and accumulated on
doi:10.1615/tfesc1.ecv.012921
fatcat:i6fkzogfejbvhg7xzwg7syd4dy
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... disc as the spray continued. After the spray stopped, the frozen water that remained on the disc then sublimated into the vacuum environment and cooled the disc. This paper examines two important aspects of this process: 1) the difference in spray start up and shutdown in a vacuum environment versus in a standard atmospheric pressure environment, and 2) the water utilization efficiency in a vacuum environment due to the effects of drop trajectories and drop bouncing on the surface. Both phenomena play a role during spray cooling in a vacuum. This knowledge should help spacecraft designers plan for spray cooling as an option to cool spacecraft electronics, human metabolic generated heat, and heat from other sources.
Page 154 of National Union Catalog Vol. 33, Issue
[page]
1963
National Union Catalog
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Kuo t chung yang yen chiu yllan shé hui k’o hsiieh yen chiu se tune kh’ t1 6 chung) Title romanized: Chune-kue bi chin shi HJ2975.L6 C 65-1552 Lo, Yiin-yen, 1890- BMA HCM Lik HHH WKi20,0931, 270 p.
1 Christianity ...
MnU NUC65-29700
Lo, Shih-hsien, ed. see Fo ching hsiian yao pien tsuan hui. hsiian yao, 1961.
Fo ching
Lo, Shih-lin, 1774-1853 see Juan, Yiian, 1764-1849, 1955. ...
Author Index
2011
Kaohsiung Journal of Medical Sciences
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, Hon-Yi Lee, Jui-Ying Shih, Hsiang-Yao Lee, June-Der Shih, Ming-Chen Paul Lee, King-Teh Singal, Rikki Lee, Mei-Hui Singh, Sher Lee, Ming-Hsing Siu, Leung-Kei Lee, Moon Kyu Sohel, Nazmul Lee, Po-Yen Sohn ...
Dong Sup Sarı, Ayşegül Akder Lee, Herng-Sheng Sengul, Demet Lee, Hsiang-Ying Sengul, Ilker Lee, Huey-Er Shakir, Ali Jabbir Lee, Jen-Jyh Sheen, Maw-Chang Lee, Jenq-Chang Sheu, Sheng-Hsiung Lee, Jia-Jung Shi ...
doi:10.1016/s1607-551x(11)00296-8
fatcat:mm5x4ihtnreubly6eonsgtqczy
Table of contents
2018
2018 14th IEEE International Conference on Signal Processing (ICSP)
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HYPERSPECTRAL IMAGE WITH
CNNS
Yanshan Li; Yong Wu; Jianjie Xu; Nengbo Zhang
586
FEATURES REPRESENTATION FOR FLUE-CURED TOBACCO GRADING BASED ON
TRANSFER LEARNING TO HARD SAMPLE
Huixin Luo; Chune ...
Lei Si; Jie Yan 153 THE MODIFIED FILTERED-X MULTICHANNEL WIENER FILTER Felix Albu 158 ONLINE SEQUENTIAL EXTREME LEARNING MACHINE ALGORITHM BASED ON THE GENERALIZED MAXIMUM CORRENTROPY CRITERION Chunfen Shi ...
doi:10.1109/icsp.2018.8652480
fatcat:elhxwghl3zbdflbxblxafw2f7i
Conductivity and dielectric properties of the monomer and polymer of the bis(p-toluene sulfonate) of 2,4-hexadiyne-1,6-diol
1992
Journal of Polymer Science Part B: Polymer Physics
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Yao, and X. Qian, Chin. J. Chem. Phys., 2, 233 (1989) (in Chinese, see CA, 112, 199742c).
. P. He, G. Yao, and X. Qian, in 3rd Asia Pacific Physics Conference, Vol. 2, Y. W. Chan et al. ...
Conductivity and Dielectric Properties of the Monomer and Polymer of the Bis(p-Toluene Sulfonate ) of 2,4-Hexadiyne-1,6-diol
HE PINGSHENG, LI CHUNE, and PENG JIANBANG
Department of Materials Science and ...
doi:10.1002/polb.1992.090300408
fatcat:a5tbytjiwbe5lib22d27s7lhly
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