The appropriate ventilation for factory spaces with regard to volume flow rate and air velocity inside the factory is one of the most important factors in the improvement of the thermal comfort of workers and in the reduction of the percentage of pollution they are exposed to, which in turn helps to improve the work environment and increase productivity. It also could improve the performance of machines. Hence, overheating can cause various problems and malfunctions. In this study, three types of mechanical ventilation systems are compared: the wall fan extract ventilation system, the roof fan extract ventilation system, and the spot cooling system. The Ansys software has been used to conduct the computational fluid dynamics (CFD) simulations for the different cases and the ventilation effectiveness factor (VEF) has been used to compare the performances of the three systems. The ventilation factor notably relies on the temperature distribution produced through the modeling and the results show that the most optimal system that can be used for similar factory spaces is the forced ventilation system. Finally, it is also the best in terms of energy consumption, despite the increase in the initial cost of its installation.
This paper is about cooling 95W socketed CPU of a desktop computer by a thermoelectric system. A Computational Fluid Dynamics analysis of this cooling system is provided in detail. The package used to perform the Computational Fluid Dynamics (CFD) analysis is ICEPAK R.18. The used computer cabin is HP Compaq dc5850. It includes all components that generate heat such as hard disk drive, CPU that has an attached heat sink, CD drive, memory cards, DVD, and power supply unit. Different thermoelectric cooling (TEC) models have been used to support transfer of heat from the 95W socketed CPU. The current study aims to present a thermoelectric cooling (TEC) model of a computer cabinet and to extend it to a module, to validate the accuracy of this model using a numerical simulation and an analytical solution, to identify the impact of using the TEC on the processor, and to study the influential factors that make the TEC efficient.
The target 01 tbis research is to study theoretically and experimcntaUy tbe performance of spot cooling of • tractor ubiael including. single interoJ heal source (tested body) by using vortex tube..la tbe tbeoretical study, tbe cabinet is cooled from the roof by ODe port ud constant wall temperature for lower aDd side walls. The effect 0( inlet .Itd o.Uet air ports poeitioos in tbe cabinet is considered.Moreover,lbe inOutoce nrvari_, th, inlet cold air velocity to cabiDet from ~.7 to 12.5 mIs, inlet cold air temperature to cabinet (rom 282.1 to 29'7.3 K, inlet air pressure to vortex tube from 1 to 6 bar, cold fraction of vortel. (ube from 29.6 to 78.9 and the uc"lmede~ number from 12.55 to 617.84 in tbe presence of II belli source with. COOSUlitt bealflul. of 120 W/m z is abo studied. In this work ,FLUENT 6.3.26 package is used ill Numerical study. The package solved the steady 2-D compressible viscous now. Various spot cooling geometries are applied. Specific conditions for eacb case are defined, aud the computational fluid dynamics is provided for tbrte different groups. Twelve CIiSes of 10C81 iolet and outlet porb. The calculations au performed (or veutilaUon errectiveness rador (VEF) which is ranging from 0.58 to 1.29. Tbe best position for tbe Inlet locations is found io the up righl of roof and the outlet locations in tbe .p of &eft side. To validate the ideal case., au eJpermiutal test rig bas ben desigoed and CODstrdCted with the Bclll.1 dimensions of the trador cabineL The esperminb are aimed out witb the same conditions the of ideal case. The compuison of t.e eIperimeatal d.ta for tb.t of the best position of the inlet port with the theoretical rC3ulb gives a satisfactory agreement.
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