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Coupled EnergyPlus and computational fluid dynamics simulation for natural ventilation

Rui Zhang, Khee Poh Lam, Shi-chune Yao, Yongjie Zhang
2013 Building and Environment  
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
more » ... 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%.
doi:10.1016/j.buildenv.2013.04.002 fatcat:bb73ifivibfq7pdieddi7v5i34

Multiphysics modeling of a micro-scale Stirling refrigeration system

Dongzhi Guo, Alan J.H. McGaughey, Jinsheng Gao, Gary K. Fedder, Minyoung Lee, Shi-Chune Yao
2013 International journal of thermal sciences  
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.
more » ... 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.
doi:10.1016/j.ijthermalsci.2013.07.003 fatcat:rbfvldhobferzja2hoqxwewwvu

Micro-electro-mechanical systems (MEMS)-based micro-scale direct methanol fuel cell development

Shi-Chune Yao, Xudong Tang, Cheng-Chieh Hsieh, Yousef Alyousef, Michael Vladimer, Gary K. Fedder, Cristina H. Amon
2006 Energy  
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/ fatcat:cavjxqquurhndae3xvacsl3bw4

Design of Stable Evaporative Micro-channel Systems Using Expanding Area
확장 면적을 이용한 안정된 증발 마이크로채널 시스템의 설계

Hee-Joon Lee, Shi-Chune Yao
2011 Transactions of the Korean Society of Mechanical Engineers B  
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

Dongzhi Guo, Jinsheng Gao, Ying-Ju Yu, Suresh Santhanam, Andrew Slippey, Gary K. Fedder, Alan J.H. McGaughey, Shi-Chune Yao
2014 International Journal of Heat and Mass Transfer  
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
more » ... 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.
doi:10.1016/j.ijheatmasstransfer.2014.01.043 fatcat:jaugtkr43jh4jnxegdjmr7nu7i

An information-theoretic framework for optimal temperature sensor allocation and full-chip thermal monitoring

Huapeng Zhou, Xin Li, Chen-Yong Cher, Eren Kursun, Haifeng Qian, Shi-Chune Yao
2012 Proceedings of the 49th Annual Design Automation Conference on - DAC '12  
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
more » ... 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.
doi:10.1145/2228360.2228476 dblp:conf/dac/ZhouLCKQY12 fatcat:6kq5xt2dybfitf5dfsh3poakh4

A mechanistic model of critical heat flux under subcooled flow boiling conditions for application to one- and three-dimensional computer codes

Jean-Marie Le Corre, Shi-Chune Yao, Cristina H. Amon
2010 Nuclear Engineering and Design  
., 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

S. C.(Shi Chune) Yao, Arthur W. Westerberg, Nien H. Chao, Carnegie Mellon UniversityDesign Research Center
Technical Report
doi:10.1184/r1/6467567.v1 fatcat:foom4bdd4faz5o7hnjpperxisy

Transient behavior of condensing or evaporating films on horizontal tubes

S. C.(Shi Chune) Yao, Nien H. Chao, Arthur W.Jt. Auth. Westerberg
Technical Report
doi:10.1184/r1/6467606 fatcat:hlrnz5ww2zgsveqk6p7dgwhv6i

Exploration of Impinging Water Spray Heat Transfer at System Pressures Near the Triple Point

Eric L. Golliher, Shi-chune Yao
2013 Volume 8B: Heat Transfer and Thermal Engineering   unpublished
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.
more » ... preliminary heat transfer model was developed to explore the interaction of these mechanisms at the surface and within the spray.
doi:10.1115/imece2013-66872 fatcat:pt4ocrq3mfhnnki764lgnmrufe


Eric L. Golliher, Shi-Chune Yao
2016 Proceeding of First Thermal and Fluids Engineering Summer Conference   unpublished
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
more » ... 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.
doi:10.1615/tfesc1.ecv.012921 fatcat:i6fkzogfejbvhg7xzwg7syd4dy

Page 154 of National Union Catalog Vol. 33, Issue [page]

1963 National Union Catalog  
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  
, 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)  
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

He Pingsheng, Li Chune, Peng Jianbang
1992 Journal of Polymer Science Part B: Polymer Physics  
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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