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Performance improvement in stepped solar still modified by sponge layer

Journal of Central South University 2024年第6期31卷 1973-1982页

作者： Mahtab TARAHOMI saman rashidi Faramarz HORMOZI Shahabeddin ASHTIANI Department of Chemical Petroleumand Gas EngineeringSemnan UniversitySemnanIran Department of Energy Faculty of New Sciences and TechnologiesSemnan UniversitySemnanIran

In this paper,the experimental investigation on the performance improvement of conventional stepped solar still is *** steps are covered by the porous material to improve the performance of the conventional device and increase the evaporation *** the parameters,including the temperature on the glass surface,the water temperature inside the evaporation zone,and the amount of water produced in both conventional and modified stepped solar stills are measured and *** efficiency of two devices and their exergy efficiency have been ***,the economic analysis of both devices has been done to check the economic feasibility of the modified *** amount of freshwater generated during one day was 2244.4 and 3076.2 mL/m^(2),respectively for the conventional and modified stepped solar *** a result,the amount of water produced in one day by modified stepped solar still is 35.5% more than the conventional ***,the costs for the conventional and modified stepped solar stills have been calculated as 0.0359 and 0.029$/(L·m^(-2)),respectively.

关键词： stepped solar still black sponge efficiency exergy economic analysis

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A review on the cooling of energy conversion and storage systems using thermoelectric modules

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Journal of Central South University 2024年第6期31卷 1998-2026页

作者： Amirreza IJADI Mehran Rajabi ZARGARABADI saman rashidi Amir Mohammad JADIDI Department of Energy Faculty of New Sciences and TechnologiesSemnan UniversitySemnanIran Faculty of Mechanical Engineering Semnan UniversityP.O.B.***SemnanIran

Exploitation of sustainable energy sources requires the use of unique conversion and storage systems,such as solar panels,batteries,fuel cells,and electronic *** load management of these energy conversion and storage systems is one of their challenges and *** this article,the thermal management of these systems using thermoelectric modules is *** results show that by choosing the right option to remove heat from the hot side of the thermoelectric modules,it will be a suitable local cooling,and the thermoelectric modules increase the power and lifespan of the system by reducing the spot *** modules were effective in reducing panel *** increase the time to reach a temperature above 50℃ in batteries by 3 to 4 ***,in their integration with fuel cells,they increase the power density of the fuel cell.

关键词： cooling photovoltaic lithium-ion batteries fuel cell electronic equipment thermoelectric modules

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Analytical approximation of heat and mass transfer in MHD non-Newtonian nanofluid flow over a stretching sheet with convective surface boundary conditions

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International Journal of Biomathematics 2017年第1期10卷 127-151页

作者： Navid Freidoonimehr Mohammad Mehdi rashidi Mohammad Hossein Momenpour saman rashidi Young Researchers and Elite ClubHamedan Branch Islamic Azad University Hamedan Iran Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems 4800 Cao An Rd. Jiadong Shanghai 201804 P. R. China ENN-Tongji Clean Energy Institute of Advanced Studies Shanghai P. R. China Department of Mechanical Engineering Ferdowsi University of Mashhad Mashhad Iran

The paper provides an analytical investigation, homotopy analysis method （HAM）, of the heat and mass transfer for magnetohydrodynamic Oldroyd-B nanofluid flow over a stretching sheet in the presence of convective boundary condition. The PDE governing equations, which consist of equations of continuity, momentum, energy and nanoparti- cles, are converted to ordinary differential equations using similarity transformations. The current HAM solution demonstrates very good correlation with those of the pre- viously published studies in the special cases. The influences of different flow physical parameters such as the Deborah numbers in terms of relaxation and retardation times （/3i, /32）, magnetic parameter （M）, Prandtl number （Pr）, Brownian motion parameter （Nb）, thermophoresis parameter （Nt）, Lewis number （Le）, and Biot number （Bi） on he fluid velocity component （f＇（η））, temperature distribution （θ（η）） and concentration φ（η）） as well as the local Nusselt number （Nux/Rex ） and the local Sherwood number （Shx/Re1/2 ） are discussed in detail.

关键词： MHD non-Newtonian fluid nanofluid stretching sheet homotopy simu-lation.

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An advanced turbulator with blades and semi-conical section for heat transfer improvement in a helical double tube heat exchanger

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Journal of Central South University 2021年第11期28卷 3491-3506页

作者： Seyed Hossein HASHEMI KAROUEI Seyed Soheil MOUSAVI AJAROSTAGHI saman rashidi Elham HOSSEINIRAD Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolMazandaranIran Department of Energy Faculty of New Science and TechnologiesSemnan UniversitySemnanIran Department of Chemical Petroleumand Gas EngineeringSemnan UniversitySemnanIran

In present work,a helical double tube heat exchanger is proposed in which an advanced turbulator with blades,semi-conical part,and two holes is inserted in inner *** geometrical parameters,including angle of turbulator’s blades(θ) and number of turbulator’s blades(N),are *** indicated that firstly,the best thermal stratification is achieved at θ=180°.Furthermore,at the lowest studied mass flow rate(m = 8 × 10^(-3) kg/s),heat transfer coefficient of turbulator with blade angle of 180° is 130.77%,25%,and 36.36% higher than cases including without turbulator,with turbulator with blade angle of θ =240°,and θ =360°,***,case with N=12 showed the highest overall *** the highest studied mass flow rate(m = 5.842 × 10^(-2) kg/s),heat transfer coefficient for case with N=12 is up to 54.76%,27.45%,and 6.56% higher than cases including without turbulator,with turbulator with N=6,and with turbulator with N=9,respectively.

关键词： helical double tube heat exchanger turbulator blade thermal performance swirl flows

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