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Numerical Study of Greenhouse Nocturnal heat Losses

Journal of Thermal Science 2011年第4期20卷 377-384页

作者： F.Berroug E.K.Lakhal M.el Omari M.Faraji h.el qarnia Laboratoire d'Automatique de l'Environnement et Procédés de Transfert UniversitéCadi AyyadFacultédes Sciences Semlalia-Département de PhysiqueMarrakech-MarocAffiliéau CNRSTURAC 28 Laboratoire de Physique des Materiaux MicroelectroniqueAutomatique et TechniqueDepartement de PhysiquesFaculte des Sciences Ain ChockUniversite Hassan IICasablanca-Maroc

In this study we quantify and analyze different components of nocturnal losses from a heated greenhouse with the presence of vegetation for typical winter weather conditions in Marrakesh-Morocco,using a non linear model,based on the greenhouse heat and mass *** was found that 12% of the total input heat was dissipate as a sensible and latent leakage losses,66% was lost by convective exchange through air-inner *** gain of energy at the inner-cover is dissipated at the outer-cover by radiation(66%)and convection(34%).This results point toward some practical measures to reduce heat losses:increasing air tightness,using covering materials with low-emissivity in the long wave band or putting up an external thermal curtain should provide significant energy savings.

关键词： Greenhouse energy balance heat losses numerical analysis.

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Thermal Analysis of a Phase Change Material Based heat Sink for Cooling Protruding electronic Chips

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Journal of Thermal Science 2009年第3期18卷 268-275页

作者： Mustapha FARAJI hamid el qarnia EI Khadir LAKhAL Fluids Mechanic and Energetic Laboratory Automatic Environment and Transfer Process Laboratory Cadi Ayyad University Faculty of Sciences Semlalia Department of Physics

This work aims to numerically study the melting natural convection in a rectangular enclosure heated by three discreet protruding electronic chips. The beat sources generate heat at a constant and uniform volumetric rate. A part of the power generated in the heat sources is dissipated to a phase change material （PCM, n-eicosane with melting temperature, Tm = 36℃）. Numerical investigations were carded out in order to examine the effects of the plate thickness on the maximum temperature of electronic components, the percentage contribution of plate heat conduction on the total removed heat and temperature profiles in the plate. Con＇elations for the dimensionless secured working time （time to reach the threshold temperature, Tcr = 75℃） and the corresponding liquid fraction were derived.

关键词： Phase change material protruding electronic component natural convection

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Thermal Analysis of Melting Occurring Inside a Finned Rectangular Enclosure Equipped with Discrete Pulsed Protruding heat Sources

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1539-1549页

作者： Brahim Amahan hamid el qarnia Ali el Afif Faculty of Sciences Department of PhysicsLaboratory of Innovation in Sciences Technology and ModelingChouaib Doukkali UniversityEl JadidaMorocco Faculty of Sciences Semlalia Fluid Mechanics and Energetic LaboratoryDepartment of PhysicsCadi Ayyad UniversityMarrakeshMorocco

This paper numerically investigates the effect of the location of a horizontal fin on the melting of a phase change material(PCM)inside a rectangular enclosure heated by multiple discrete pulsed protruding heat *** fin and the phase change material filling the enclosure store the thermal energy extracted from the heat sources,in sensible and latent *** heat sources are assumed to simulate electronic components undergoing a superheating technical *** extracting heat from the electronics,the PCM plays the role of a heat *** analyze the thermal behavior and predict the cooling performance of the proposed cooling system,we derive a nonlinear mathematical model based on mass,momentum and energy conservation *** numerical investigations are conducted to quantify the influence of the fin position on the thermal behavior and the cooling performance of the heat *** include the transient maximum temperature occurring inside the heat sources and the liquid volume.A comparison between our numerical results and experimental data selected from the literature shows a good *** main conclusion is that the presence of the fin leads to a slight increase in the melting time.

关键词： Phase change material melting heat transfer pulsed heating electronics cooling heat storage fin

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The Effect of the Fin Length on the Solidification Process in a Rectangular Enclosure with Internal Fins

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Fluid Dynamics & Materials Processing 2019年第2期15卷 125-137页

作者： Laila Khatra hamid el qarnia Mohammed el Ganaoui Cadi Ayyad University Faculty of Sciences SemlaliaDepartment of PhysicsP.O.2390Fluid Mechanics and Energetic(affiliated to CNRSTURAC 27)MarrakeshMorocco Lorraine University Energetic Laboratory of Longwy(FJV/LERMAB)Henri PoincaréInstitute of LongwyFrance

The aim of the proposed work is to study the solidification process within a rectangular enclosure provided with three internal rectangular fins attached to the left vertical wall of the *** latest is filled with a phase change material(PCM),initially liquid,at a temperature above its melting *** solidification process was initiated by cooling the left wall and fins to a temperature lower than the melting *** order to study and examine the thermal behavior and thermal performance of the proposed system,a mathematical model,based on the conservation equations of mass,momentum and energy was *** governing equations and their associated boundary and initial conditions were next ***,several controlling parameters were *** volume control method was used to discretize the *** resulting algebraic equations were solved *** investigations were carried out to study and examine the effect of the dimensionless fin length on the hydrodynamic and thermal fields of the flow,the dimensionless heat flux,the solidified mass fraction and the dimensionless time of complete solidification.

关键词： Phase change material solidification enthalpy method fins rectangular enclosure

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