5 documents found, page 1 of 1
Modeling and parametric optimization of a liquid piston compressor with inner c...
Cerkovnik, N.; Costa, V.A.F.; Lopes, A.M.G.This work proposes a new configuration of liquid piston compressors and a methodology for their optimization, with special attention to heat removal from the compressing gas, in order to minimize the mechanical work required for the compression process. The adopted approach starts with the solution of the governing equations through a 0D model (lumped approach). A new correlation for the heat transfer coefficie...
Analysis of the air infiltration through the doorway of a refrigerated room usi...
Gonçalves, J. C.; Costa, J.J.; Lopes, A.M.G.This paper presents the study of the air movement through the doorway of a refrigerated room, using both numerical and experimental approaches. Firstly, a comparison is made between the experimentally observed infiltration rates and the predictions by seven empirical models. For different test conditions of the specific laboratory configuration under analysis (a refrigerated room at laboratory scale), the infil...
Parametric study on the performance of an air curtain based on CFD simulations ...
Goncalves, J. C.; Costa, J.J.; Lopes, A.M.G.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...
Study of the aerodynamic sealing of a cold store – Experimental and numerical a...
Goncalves, J.C.; Costa, J.J.; Figueiredo, A.R.; Lopes, A.M.G.An experimental study was conducted in a laboratory scale model in order to characterize the airflow generated by an air curtain device (ACD) on the aerodynamic sealing of refrigerated spaces. The laboratory scale model consists of two similar adjacent rooms connected by a door over which the ACD device was installed. The tracer gas technique was used to calculate the sealing effect achieved with the air curtai...
CFD modelling of aerodynamic sealing by vertical and horizontal air curtains
Goncalves, J.C.; Costa, J.J.; Figueiredo, A.R.; Lopes, A.M.G.This work presents a comparative study of the aerodynamic sealing of doorways of refrigerated rooms, obtained by vertical and horizontal air curtain devices (ACD). The sealing efficiency is estimated for different situations, with the ACD installed inside, outside or on both sides of the door. For this purpose, a numerical model was developed for the simulation of the turbulent non-isothermal 3D airflow generat...