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A new and applicable method to calculate mass and heat transfer coefficients and efficiency of industrial distillation columns containing structured packings
Sadeghifar, Hamidreza; Kordi, Safe; Akbar, Ali - In: Energy 36 (2011) 3, pp. 1415-1423
Most of the methods developed for efficiency estimation of distillation columns were based on the empirical mass … efficiency (and mass and heat transfer coefficients) of distillation columns containing structured packings. This method has … transfer and hydraulic relations correlated to laboratory data. Therefore, these methods cannot estimate efficiency of …
Persistent link: https://www.econbiz.de/10010811338
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Exergetic analysis of distillation processes—A case study
Araújo, Antonio B.; Brito, Romildo P.; Vasconcelos, … - In: Energy 32 (2007) 7, pp. 1185-1193
computation of their irreversibility rate and thermodynamic efficiency, are considered. An industrial case study on the … purification of 1,2-ethylenedichloride (EDC) in a high-purity distillation column is presented. Due to its large throughput, this … distillation column consumes a large amount of thermal energy (steam to the reboiler) and in order to reduce the energy …
Persistent link: https://www.econbiz.de/10011055959
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Synthesis of heat exchanger networks featuring batch streams
Wang, Yufei; Wei, Ying; Feng, Xiao; Chu, Khim Hoong - In: Applied Energy 114 (2014) C, pp. 30-44
A new method based on the heat duty–time (Q–t) diagram is proposed for heat integration of heat exchanger networks featuring batch streams. Using the Q–t diagram method, the energy targets and the structure of the initial heat exchanger network can be easily obtained. The method can be...
Persistent link: https://www.econbiz.de/10010729370
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Confidence Region for long memory based on Inverting Bootstrap Tests: an application to Stock Market Indices
Peretti, Christian De; Siani, Carole - Centre d'Études des Politiques Économiques (EPEE), … - 2008
In the context of long memory, the finite-sample distortion of statistic distributions is so large, that bootstrap confidence intervals (percentile and percentile-t) for the long memory parameter do not perform better than the corresponding asymptotic confidence interval. In this paper, we...
Persistent link: https://www.econbiz.de/10010640923
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Using Cost-Volume-Profit Analysis in Decision Making
Buşan, Gabriela; Dina, Ionela-Claudia - In: Annals of the University of Petrosani, Economics 9 (2009) 3, pp. 103-106
The cost-volume-profit study the manner how evolve the total revenues, the total costs and operating profit, as changes occur in volume production, sale price, the unit variable cost and / or fixed costs of a product. Managers use this analysis to answer different questions like: How will...
Persistent link: https://www.econbiz.de/10008470149
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Graphical Methods for Investigating the Finite-sample Properties of Confidence Regions: an application to long memory
Peretti, Christian de; Siani, Carole - Society for Computational Economics - SCE - 2006
In the literature, there are not satisfactory methods for measuring and presenting the performance of confidence regions. In this paper, techniques for measuring effectiveness of confidence regions and for the graphical display of simulation evidence concerning the coverage and effectiveness of...
Persistent link: https://www.econbiz.de/10005170548
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Assessment of different methods used to estimate Weibull distribution parameters for wind speed in Zafarana wind farm, Suez Gulf, Egypt
Saleh, H.; Abou El-Azm Aly, A.; Abdel-Hady, S. - In: Energy 44 (2012) 1, pp. 710-719
The use of wind as an energy source is becoming popular because of its non-polluting and renewable features. There is an urgent request to develop site-based estimation on wind engineering, which can be used for optimal design of wind turbines and wind farming. The wind speed for Zafarana...
Persistent link: https://www.econbiz.de/10011053410
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A graphical method for integrating work exchange network
Liu, Guilian; Zhou, Hua; Shen, Renjie; Feng, Xiao - In: Applied Energy 114 (2014) C, pp. 588-599
Based on the characteristics of work exchanger, a graphical integration method is developed for work exchange network. In this method, the composite curves of work sinks and work sources are plotted in the lnP versus W diagram. Two linearly approximated sink auxiliary lines are proposed to...
Persistent link: https://www.econbiz.de/10011041142
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Design and development in optics of concentrator photovoltaic system
Chong, Kok-Keong; Lau, Sing-Liong; Yew, Tiong-Keat; … - In: Renewable and Sustainable Energy Reviews 19 (2013) C, pp. 598-612
Due to the dramatic advances in commercial multi-junction solar cells with 40% conversion efficiency, solar … concentrator capable of delivering flux levels of hundreds to thousands of suns at high collective efficiency is the key factor for …
Persistent link: https://www.econbiz.de/10010608330
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A new concept for integrating a thermal air power tube with solar energy and alternative, waste heat energy sources and large natural or man-made, geo-physical phenomenon
Di Bella, Francis A.; Gwiazda, Jonathan - In: Renewable Energy 30 (2005) 2, pp. 131-143
recovery, and air diffuser subsystems for enhanced wind turbine efficiency. …
Persistent link: https://www.econbiz.de/10010806814