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RISS 인기검색어
- 검색키워드
- 저자 : Pesaran, Alireza (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Review article: Numerical simulation of adsorption heat pumps
Pesaran, Alireza,Lee, Hoseong,Hwang, Yunho,Radermacher, Reinhard,Chun, Ho-Hwan Elsevier 2016 ENERGY Vol.100 No.-
<P><B>Abstract</B></P> <P>The primary advantages of the AHP (adsorption heat pump) including using environmentally friendly working fluids and their capability of using low-grade waste heat as their primary driving energy have raised a great deal of attention in recent years. In this work, computer models of AHPs and the latest relevant findings are reviewed since the performance of an AHP system greatly depends on the coupled heat and mass transfer rates inside the adsorbent bed and the design parameters of the adsorber. The nonlinearity of the coupled heat and mass transfer equations makes the qualitative analysis of such systems difficult and hence many researchers have proposed various models to predict the performance of the system and optimize the design parameters to boost the performance. The available models in the literature have been categorized into thermodynamic models, lumped-parameter models, and distributed-parameter (heat and mass transfer) models. The results of the literature review indicate that recent numerical modeling of AHPs relies on the distributed-parameter models. Majority of the modeling works are focused on validating the proposed model and used the model to optimize the adsorber design parameters and operating conditions of the system. Based on the literature review, some potential future research areas are suggested.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reviewed different types of models to predict the adsorption heat pump performance. </LI> <LI> Distributed-parameter models are identified as the most accurate models. </LI> <LI> Linear driving force model is widely used for the internal mass transfer resistance. </LI> <LI> Darcy's law is widely used for the external mass transfer resistance. </LI> </UL> </P>
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Hossein Shad,Azlan Adnan,Hamid Pesaran Behbahani,Mohammadreza Vafaei 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.1
Tuned Liquid Dampers (TLDs) provide low damping when it comes to deep water condition, and that not all water depth is mobilized in energy dissipation. This research focussed on a method to improve the efficiency of TLDs with deep water condition. Several bottom-mounted baffles were installed inside a TLD and the dynamic characteristics of modified TLDs together with their effect on the vibration control of a SDOF structure were studied experimentally. A series of free vibration and harmonic forced vibration tests were carried out. The controlling parameter in the conducted tests was the Vertical Blocking Ratio (VBR) of baffles. Results indicated that increase in VBR decreases the natural frequency of TLD and increases its damping ratio. It was found that the VBR range of 10% to 30% reduced response of the structure significantly. The modified TLD with the VBR of 30% showed the best performance when reduction in structural responses under harmonic excitations were compared.
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Experimental study on TLDs equipped with an upper mounted baffle
Hossein Shad,Azlan bin Adnan,Mohammadreza Vafaei,Hamid Pesaran Behbahani,Abdulkareem M. Oladimeji 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
Tuned Liquid Dampers (TLDs) have gained wide acceptance as a system for structural control and energy dissipation. However, they face limitation caused by low damping in deep water, which affects their efficiency. Another problem with deep water TLDs is that not all water depth participates in energy dissipation. This paper investigated the effect of upper mounted baffles on the effectiveness of TLDs. The Vertical Blockage Ratio (VBR) of baffles ranged from 10% - 90%. The TLD (with and without baffle), structure, and combined structure with TLD (with and without baffles) were subjected to free and harmonic forced vibrations. Results indicated that baffles could significantly enhance the energy dissipation of TLDs, thus reducing structural responses more than structures equipped with ordinary TLDs. It was found that, there was an optimum value of VBR in which the TLD\'s efficiency was maximized. When TLD had an appropriate VBR, the structural acceleration and displacement responses were suppressed significantly up to 51% and 56%, respectively.
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Experimental study on TLDs equipped with an upper mounted baffle
Shad, Hossein,Adnan, Azlan bin,Vafaei, Mohammadreza,Behbahani, Hamid Pesaran,Oladimeji, Abdulkareem M. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
Tuned Liquid Dampers (TLDs) have gained wide acceptance as a system for structural control and energy dissipation. However, they face limitation caused by low damping in deep water, which affects their efficiency. Another problem with deep water TLDs is that not all water depth participates in energy dissipation. This paper investigated the effect of upper mounted baffles on the effectiveness of TLDs. The Vertical Blockage Ratio (VBR) of baffles ranged from 10% - 90%. The TLD (with and without baffle), structure, and combined structure with TLD (with and without baffles) were subjected to free and harmonic forced vibrations. Results indicated that baffles could significantly enhance the energy dissipation of TLDs, thus reducing structural responses more than structures equipped with ordinary TLDs. It was found that, there was an optimum value of VBR in which the TLD's efficiency was maximized. When TLD had an appropriate VBR, the structural acceleration and displacement responses were suppressed significantly up to 51% and 56%, respectively.
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Parisa Yekan Motlagh,Reza Darvishi Cheshmeh Soltani,Zoha Pesaran,Sema Akay,Berkant Kayan,Yeojoon Yoon,Alireza Khataee 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
The present study aimed at treating a water medium containing pharmaceutical compounds such aslevofloxacin (LEV). For this purpose, ultrasound (US)-based degradation of LEV was catalyzed by TiO2and ZrO2 nano-catalysts supported on biochar (BC). BC was obtained from a precursor composite of papersludge and wheat husk. The application of BC-ZrO2 led to a degradation efficiency of 54.65% within60 min. When BC-TiO2 was used, a lower degradation efficiency of 49.62% was obtained at the same reactiontime. However, increasing the time to 120 min improved the sonocatalytic degradation of LEV by BCTiO2(72.88%) compared to that of BC-ZrO2 (66.42%). In the presence of H2O2 and S2O8 2, the LEV degradationefficiency of US/BC-TiO2 increased from 72.88% to 87.98% and 94.03%, respectively, and for theUS/BC-ZrO2 process, it increased from 66.42% to 76.79% and 90.14%, respectively. The addition of isopropanolcaused the most suppressive effect on the sonocatalytic degradation of LEV for both US/BCTiO2(decreasing from 72.88% to 13.99%) and US/BC-ZrO2 (decreasing from 66.42% to 16.43%) processes. The reusability test results showed an approximately 20% reduction in the sono-reactor performancewithin three consecutive experimental runs with no substantial change in the functional groups of theas-prepared sonocatalyst. Intermediates of LEV decomposed by the two sonocatalytic processes were alsoidentified.
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