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Heat and mass transfer in an adjacent internally-cooled membrane-based liquid desiccant dehumidifier (AIMLDD)

Energy Procedia 2017年 142卷 3990-3997页

作者： Yu Yang Minlin Yang Weihao Huang Si-Min Huang Wei-Biao Ye Yuxiang Hong Frank G.F. Qin Youyuan Shao Key Laboratory of Distributed Energy Systems of Guangdong Province Dongguan University of Technology Dongguan 523808 China Department of Process Equipment and Control Engineering School of Mechanical Engineering Xiangtan University Xiangtan 411105 China Department of Chemistry and Chemical Engineering Lishui University Lishui 323000 Zhejiang China

An adjacent internally-cooled membrane-based liquid desiccant dehumidifier (AIMLDD) is proposed and used for air dehumidification. The AIMLDD is a parallel-plate membrane contactor, which contains cooling channels. The air and the solution streams are separated by selectively permeable membranes, while the solution and the water streams are separated by plastic plate. The air stream flows in a cross-flow arrangement with the solution stream, while the solution stream flows in a co-current flow arrangement with the water stream. Establish a mathematical model in a unit cell, which contains half of an air channel, a piece of membrane, a solution channel, a piece of plastic plate, and half of a cooling channel, to research the conjugate heat and mass transports in the AIMLDD. Use a finite difference method to solve the normalized equations governing momentum, heat and mass transports. The dehumidification amount, the efficiency and outlet parameters are then obtained. A continuous air dehumidification system based on the AIMLDD is set up to validate the numerical results. Compare the efficiency under different condition and different structure of the membrane contactor. It can be found that the dehumidification amount and the efficiency for the AIMLDD are higher than those for an adiabatic one.

关键词： Heat mass transfer Adjacent internally-cooled membrane dehumidifier Air dehumidification Parallel-plate Efficiency

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An Integrated Design for Batch Process using Optimal Average Profit control with Unfixed Terminal Time 35

An Integrated Design for Batch Process using Optimal Average...

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第35届中国控制会议

作者： LU Pengcheng XIE Lei CHEN Junghui SU Hongye Institute of Cyber-Systems and Control National Key Laboratory of Industrial Control TechnologyZhejiang University Department of Chemical Engineering Chung Yuan Christian University

ISBN: (纸本)9781509009107

Batch processes are flexible to meet the needs of the fluctuated market and have become very important in the modern chemical ***-level control structure is widely adjusted in the operation of batch *** higher level is the end-point property control and the low level tracks the time-varying reference trajectories designed by the high *** twolevel control structure does not take the dynamics of the low level into consideration in the high level that the low level cannot track the given trajectories perfectly because of model-plant ***,this structure does not take the duration of the batch process into consideration which may lead to economic loss in the *** integrated control structure is proposed in this paper to deal with the drawbacks of two-level ***,different from the traditional objective of the high level,it is a pure economic objective in the integrated control structure using average profit *** order to gain higher economic performance,the predictive horizon is relaxed here to achieve larger feasible region.

关键词： Integrated Average Unfixed On-line Nonlinear Optimization

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Adaptive, online models to detect and estimate gross error in SPNDs

Adaptive, online models to detect and estimate gross error i...

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Indian control Conference (ICC)

作者： Arindam Bhattacharyya Vivek Yogi Sugandha Singla Mani Bhushan Mahendra G. Kelkar Akhilanand P. Tiwari Mahitosh Pramanik Madhu N. Belur Department of Electrical Engineering Department of Chemical Engineering Indian Institute of Technology Bombay India Nuclear Power Corporation of India Ltd Mumbai India Reactor Control Systems Design Section Bhabha Atomic Research Center Mumbai India

ISBN: (纸本)9781509017966

In-core flux measurement is critical for monitoring and power regulation of a large core nuclear reactor. Self Powered Neutron Detectors (SPNDs) are used for measuring the neutron flux in a nuclear reactor. In this paper we propose an online method for SPND gross error detection, identification and estimation. The method uses linear models which are extracted from data and which adapt continuously in time. This adaption is made possible by use of recursive PCA. However, unlike existing recursive PCA approaches which make approximations to achieve recursion, our proposed approach does not make any approximation. We term our technique as `Recursive Principal Component Analysis: Exact Computation' (RPCA-EC). Use of recursion ensures that the computational requirements of RPCA-EC are low thereby facilitating online implementation. Continuous adaption ensures that the model evolves to adequately capture the time varying relationships amongst the SPNDs. The relationships amongst the SPNDs vary with time due to significant variations in the neutron flux profiles in the reactor with varying operating power levels in the reactor. We apply our proposed method on data taken from an operating nuclear reactor in India and compare results with alternate implementations. Results show that the false alarm rate of our implementation is reasonable thereby indicating that the model adapts to time varying relationships. Performance in presence of gross errors is also satisfactory.

关键词： Detectors Inductors Neutrons Principal component analysis Adaptation models Covariance matrices Computational modeling

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Input optics systems of the KAGRA detector during O3GK (vol 2023, 023F01, 2023)

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PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2023年第5期2023卷

作者： Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Asada, H. Aso, Y. Bae, S. Bae, Y. Baiotti, L. Bajpai, R. Barton, M. A. Cannon, K. Cao, Z. Capocasa, E. Chan, M. Chen, C. Chen, K. Chen, Y. Chiang, C-I Chu, H. Chu, Y-K Eguchi, S. Enomoto, Y. Flaminio, R. Fujii, Y. Fujikawa, Y. Fukunaga, M. Fukushima, M. Furuhata, T. Gao, D. Ge, G-G Ha, S. Hagiwara, A. Haino, S. Han, W-B Hasegawa, K. Hattori, K. Hayakawa, H. Hayama, K. Himemoto, Y. Hiranuma, Y. Hirata, N. Hirose, E. Hong, Z. Hsieh, B-H Huang, G-Z Huang, H-Y Huang, P. Huang, Y-C Huang, Y-J Hui, D. C. Y. Ide, S. Ikenoue, B. Imam, S. Inayoshi, K. Inoue, Y. Ioka, K. Ito, K. Itoh, Y. Izumi, K. Jeon, C. Jin, H-B Jung, K. Jung, P. Kaihotsu, K. Kajita, T. Kakizaki, M. Kamiizumi, M. Kanbara, S. Kanda, N. Kang, G. Kataoka, Y. Kawaguchi, K. Kawai, N. Kawasaki, T. Kim, C. Kim, J. Kim, J. C. Kim, Ws Kim, Y-M Kimura, N. Kita, N. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A. K. H. Kotake, K. Kozakai, C. Kozu, R. Kumar, R. Kume, J. Kuo, C. Kuo, H-S Kuromiya, Y. Kuroyanagi, S. Kusayanagi, K. Kwak, K. Lee, H. K. Lee, H. W. Lee, R. Leonardi, M. Li, K. L. Lin, L. C-C Lin, C-Y Lin, F-K Lin, F-L Lin, H. L. Liu, G. C. Luo, L-W Majorana, E. Marchio, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyazaki, Y. Miyo, K. Miyoki, S. Mori, Y. Morisaki, S. Moriwaki, Y. Nagano, K. Nagano, S. Nakamura, K. Nakano, H. Nakano, M. Nakashima, R. Nakayama, Y. Narikawa, T. Naticchioni, L. Negishi, R. Quynh, L. Nguyen Ni, W-T Nishizawa, A. Nozaki, S. Obuchi, Y. Ogaki, W. Oh, J. J. Oh, S. H. Ohashi, M. Ohishi, N. Ohkawa, M. Ohta, H. Okutani, Y. Okutomi, K. Oohara, K. Ooi, C. Oshino, S. Otabe, S. Pan, K-C Pang, H. Parisi, A. Park, J. Arellano, F. E. Pena Pinto, I. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sakuno, Y. Sato, S. Sato, T. Sawada, T. Sekiguchi, T. Sekiguchi, Y. Shao, L. Shibagaki, S. Shimizu, R. Shimoda, T. Shimode, K. Shinkai, H. Shishido, T. Shoda, A. Somiya, K. Son, E. J. Sotani, H. Sugimoto, R. Suresh, J. Suzuki, T. Suzuki, T. Tagoshi, H. Takahashi, H Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Research Center for the Early Universe The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Institute for Cosmic Ray Research KAGRA Observatory The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa City Chiba 277-8582 Japan Accelerator Laboratory High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba City Ibaraki 305-0801 Japan Earthquake Research Institute The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo 113-0032 Japan Department of Mathematics and Physics Graduate School of Science and Technology Hirosaki University 3 Bunkyo-cho Hirosaki Aomori 036-8561 Japan Kamioka Branch National Astronomical Observatory of Japan 238 Higashi-Mozumi Kamioka-cho Hida City Gifu 506-1205 Japan The Graduate University for Advanced Studies (SOKENDAI) 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Korea Institute of Science and Technology Information 245 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea National Institute for Mathematical Sciences 70 Yuseong-daero 1689 Beon-gil Yuseong-gu Daejeon 34047 Republic of Korea International College Osaka University 1-1 Machikaneyama-cho Toyonaka City Osaka 560-0043 Japan School of High Energy Accelerator Science The Graduate University for Advanced Studies (SOKENDAI) 1-1 Oho Tsukuba City Ibaraki 305-0801 Japan Department of Astronomy Beijing Normal University Xinjiekouwai Street 19 Haidian District Beijing 100875 China Department of Applied Physics Fukuoka University 8-19-1 Nanakuma Jonan Fukuoka City Fukuoka 814-0180 Japan Department of Physics Tamkang University No. 151 Yingzhuan Road Danshui Dist. New Taipei City 25137 Taiwan Department of Physics

KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25 to March 10, 2020, and its first joint observation with the GEO 600 detector from April 7 to April 21, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kilohertz, whereas the laser intensity did not significantly limit the detector sensitivity.

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Determination of thermophysical characteristics of vulcanizable rubber products by the mathematical modeling method

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Journal of Physics: Conference Series 2018年第1期973卷

作者： S G Tikhomirov Y V Pyatakov O V Karmanova A A Maslov Information and control systems department Voronezh state university of engineering technologies Revolution Av. 19 Voronezh Russia Chemistry and chemical technology of organic compounds and polymers processing department Voronezh state university of engineering technologies Leninsky Av. 14 Voronezh Russia

The studies of the vulcanization kinetics of elastomers were carried out using a Truck tyre tread rubber compound. The formal kinetic scheme of vulcanization of rubbers sulfur-accelerator curing system was used which generalizes the set of reactions occurring in the curing process. A mathematical model is developed for determining the thermal parameters vulcanizable mixture comprising algorithms for solving direct and inverse problems for system of equations of heat conduction and kinetics of the curing process. The performance of the model is confirmed by the results of numerical experiments on model examples.

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Investigation on Cylindrical Particle Position Distribution in Fluidized Bed Using XPTV Method

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第7期38卷 1384-1391页

作者： Zhong, Wen-Qi Chen, Xi Yu, Ai-Bing Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China Center for Simulation and Modeling of Particulate Systems Southeast University-Monash University Joint Research Institute Suzhou215123 China Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

An X-ray particle tracking velocimetry (XPTV) system is designed and built, and the corresponding tracer particle fabrication method is established. With the XPTV system, the cylindrical particle position and orientation determination method and its error evaluation are investigated. Experimental studies on cylindrical particle position and orientation distribution are carried out based on the aforementioned system and methods. The results show that in bubbling fluidization regime, an internal circulation of cylindrical particles forms in the fluidized bed, and the center axes of most cylindrical particles tend to tilt instead of being vertical. In turbulence fluidization regime, cylindrical particles tend to uniformly disperse across the fluidized bed, and the center axes of most cylindrical particles are vertical. © 2017, Science Press. All right reserved.

关键词： Fluidized beds

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Experimental study on f-ω regulation model under abnormal methane emission

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International Journal of Mining Science and Technology 2016年第6期26卷 1153-1159页

作者： Wu Zhengyan Jiang Shuguang Wang Kai Shao Hao Zhou Song He Xinjian Han Jing Cui Chuanbo Pei Xiaodong Key Laboratory of Coal Methane and Fire Control Ministry of Education China University of Mining and Technology Xuzhou 221116 China School of Safety Engineering China University of Mining and Technology Xuzhou 221116 China State Key Laboratory of Cool Resources and Safe Mining China University of Mining and Technology Xuzhou 221116 China Department of Chemical Engineering Engineering Faculty Monash University Melbourne Victoria 3800 Australia Department of Industrial Management and Systems Engineering Statler College of Engineering and Mineral Resources West Virginia University Morgantown WV 26506 USA School of Mining and Safety Engineering Anhui University of Science and Technology Huainan 232001 China

In view of the difficulty of automatic adjustment, the recovery lag and the major accident potential of the mine ventilation system, an experimental model of the pipe net was established according to the typical one mine and one working face ventilation system of Daliuta coal mine. Using the best uniform approximation method of Chebyshev interpolation to fit the fan performance curve, we experimentally determined fan characteristics with different frequencies and establish the data base for the curves. Based on ventilation network monitoring theory, we designed a monitoring system for ventilation network parameter monitoring and fan operating frequency automatic control. Using the absolute methane emission quantity to predict the air quantity requirement of branch and fan frequency, we established a f-ω regulation model based on fan frequency and absolute methane emission quantity. After analysing methane emission and distribution characteristics, using CO_2 to simulate the methane emission characteristics from a working face, we verified the correctness and rationality of the f-ω regulation model. The fan operation frequency is adjusted by the method of air adjustment change with methane emission quantity and the curve searching method after determining air quantity requirements. The results show that the air quantity in a branch strictly changes according to the f-ω regulation model, in the airincreasing dilution by fan frequency regulation, the CO_2 concentration is limited to the set threshold value. The paper verifies the practicability of a frequency regulation system and the feasibility of the frequency adjustment scheme and provides guidance for the construction of automatic frequency conversion control system in coal mine ventilation networks.

关键词： Pipe network model Frequency regulation f-ω regulation model Prediction of air quantity requirement Air-increasing dilution

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Scaling up of Lactic Acid Fermentation using Enterococcus faecalis

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IOP Conference Series: Materials Science and engineering 2019年第1期495卷

作者： Cirilo Nolasco-Hipolito Octavio Carvajal-Zarrabal Eivo Kelvin Yie Hua Tan Mizuno Kohei Stanley Anthony Nyoel Esaki Shoji Hamady Dieng Kopli Bujang Institute of Biotechnology Universidad del Papaloapan Circuito Central #200 Col. Parque Industrial CP. 68301 Tuxtepec Oaxaca. Mexico. Faculty of Engineering. Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia. Biochemical and Nutrition Chemistry Area University of Veracruz SS Juan Pablo II s/n Boca del Río CP 94294 Veracruz Mexico. Department of Chemical Engineering Curtin University Malaysia CDT 250 Miri 98009 Sarawak Malaysia. Department of Creative Engineering National Institute of Technology Kitakyushu College Kitakyushu 802-0985 Japan. Department of Control and Information Systems Engineering Kurume National College of Technology 1-1-1 Komorino Kurume-shi Fukuoka 830-8555 Japan. Institute of Biodiversity and Environmental Conservation Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia. Faculty of Resource Science and Technology Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia.

Lactic Acid bacterium (LAB) Enterococcus faecalis was used with the aim of scaling up a lactic acid fermentation (LAF) from 3L jar fermenter to pilot scale up to 100-L in an open fermentation. Batch mode in Lab and pilot scale fermentations were compared in terms of productivity, overall yield, cell growth, lactic acid production, and glucose consumption. Fermentations were performed at pH 6.86, 45 oC, and 100 rpm. Process simulation was conducted by using SuperPro Software and the data obtained from pilot scale. The results were compared using t-test and ANOVA. The results showed that the production rate of Lab scale was 4.96±0.09 g/Lh with a yield of 0.93 ±0.005. While for pilot scale, the production rate was 3.91 g/Lh with a yield of 0.915 ±0.005. There was no significant difference between both processes, regarding the yield, but there was a difference regarding the production rate, being slowly lower for pilot scale, but still high for industrial scaling up. Contamination was controlled fairly because Enterococcus faecalis is a thermophilic strain and then, proved to have industrial potential to produce Lactic Acid (LA).

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Quantum Dots: Single Halide Perovskite/Semiconductor Core/Shell Quantum Dots with Ultrastability and Nonblinking Properties (Adv. Sci. 18/2019)

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Advanced Science 2019年第18期6卷 1970107-1970107页

作者： Xiaosheng Tang Jie Yang Shiqi Li Zhengzheng Liu Zhiping Hu Jiongyue Hao Juan Du Yuxin Leng Haiyan Qin Xing Lin Yue Lin Yuxi Tian Miao Zhou Qihua Xiong Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education) College of Optoelectronic Engineering Chongqing University Chongqing 400044 China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Center for Chemistry of Nover and High-Performance Materials and Department of Chemistry Zhejiang University Hangzhou 310027 P. R. China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Key Laboratory of Vehicle Emissions Control Nanjing University Nanjing 210023 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

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An Experimental Evaluation of an Adaptive MPC Scheme based on Output Error Models Parameterized using Orthonormal Basis Filters ∗

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IFAC-PapersOnLine 2016年第1期49卷 664-669页

作者： Prashant V. Patil Rahul Choudhary Nitinkumar Patel Sachin C. Patwardhan Dept. of Electrical Engineering Walchand College of Engineering Sangli India Systems and Control Engineering Indian Institute of Technology Bombay India Dept. of Chemical Engineering Indian Institute of Technology Bombay India

Over the last three decades, Model Predictive control (MPC) has emerged as an important tool for handling constrained multivariable control problems. Most of the commercially available MPC schemes employ linear prediction models, which can quickly become obsolete and this results in deterioration of the closed loop performance. A possible remedy to this problem is to employ adaptive MPC (AMPC) scheme in which the model parameters are updated online. However, the parameter drift leading to instability is an important concern while developing an AMPC scheme. In this work, it is proposed to develop a Multiple Input Multiple Output(MIMO) AMPC scheme based on multiple Multiple Input Single Output(MISO) models that have output error (OE) structure and are parameterized using orthonormal basis filters (OBF). The poles of the OBF are estimated offline from a batch of perturbation data. In the model update component of the proposed AMPC formulation, the OBF poles are kept fixed and only the Fourier coe¢cients are updated online using the recursive least squares method. This measure avoids the transgression of the poles outside the stable region during the transients. Efectiveness of the proposed AMPC scheme is demonstrated by conducting experimental studies on the benchmark quadruple tank system. Analysis of the experimental results reveals that the proposed AMPC formulation provides a promising approach for controlling moderately nonlinear systems.

关键词： Model Predictive control Adaptive control Orthonormal Basis Filters

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