Parametric study on the performance of an air curtain based on CFD simulations - New proposal for automatic operation
| Autor: | J.C. Gonçalves, A. M. G. Lopes, José J. Costa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Air curtain Cold rooms 010504 meteorology & atmospheric sciences Parametric study Airflow Nozzle Computational fluid dynamics Sealing efficiency 01 natural sciences 010305 fluids & plasmas 0103 physical sciences Heat transfer 0105 earth and related environmental sciences Civil and Structural Engineering Parametric statistics Jet (fluid) Renewable Energy Sustainability and the Environment Turbulence business.industry Mechanical Engineering Mechanics Environmental science Transient (oscillation) business CFD |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | This paper presents a parametric study on the performance of an air curtain installed over an access door of a refrigerated room. The aim of this work is to quantify, in an integrated way, the influence of the following geometrical and dynamic parameters: door height; temperature difference between rooms, nozzle thickness; initial orientation angle; jet discharge velocity. A numerical model was used to simulate the turbulent non-isothermal 3D airflow generated in the transient period after the door is opened, with the air curtain device turned on or off. Turbulence effects were taken into account with the k-SST model. Results show that the optimum discharge velocity of the air curtain increases with the door height, as well as with the temperature difference between both sides of the air curtain. It was also possible to find an optimum jet nozzle width corresponding to maximum sealing efficiency and lower jet airflow rate. A proposal is made for an empirical correlation to predict the optimum jet discharge velocity as function of the variables used in the parametric study. Additionally, to ensure that the air curtain operates near the optimum conditions, the appropriate air curtain settings are discussed and a new strategy is suggested. info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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