Heat Exchangers
Mostrando 13-24 de 98 artigos, teses e dissertações.
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13. Atenuação témica interna nos grupos geradores de energia utilizando trocadores de calor de água gelada controlada / Attenuation in the internal thermal energy generators, heat exchangers using cold water controlled
Este trabalho apresenta o dimensionamento e cálculos do trocador de calor duplo-tubo de cotato indireto e troca direta, aplicado nas instalações dos geradores elétricos a combustão, com o objetivo de analisar a viabilidade de um projeto para tratamento do ar quente gerado dentro das estruturas metálicas ou canópias. Os dados coletados basearam-se no l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/07/2012
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14. Distribuição do tempo de residência e letalidade no processamento térmico contínuo de líquidos com escoamento laminar não ideal em trocadores bitubulares. / Residence time distribution and lethality in the continuous thermal processing of liquids with non ideal laminar flow in bitubular exchangers.
Tubular heat exchangers are widely used for thermal processing of viscous liquid foods because they have larger hydraulic diameters than the plate heat exchangers. The calculation of lethality in this type of exchanger is directly related to velocity profile and the residence time distribution (RTD). For the laminar flow of viscous fluids, Newtonian and non-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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15. Effect of heat and moisture exchangers on the prevention of ventilator-associated pneumonia in critically ill patients
Ventilator-associated pneumonia (VAP) remains one of the major causes of infection in the intensive care unit (ICU) and is associated with the length of hospital stay, duration of mechanical ventilation, and use of broad-spectrum antibiotics. We compared the frequency of VAP 10 months prior to (pre-intervention group) and 13 months after (post-intervention g
Braz J Med Biol Res. Publicado em: 2012-12
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16. Dimensional analysis and empirical correlations for heat transfer and pressure drop in condensation and evaporation processes of flow inside micropipes: case study with carbon dioxide (CO2)
In this paper, the experimental results of the convection heat transfer coefficient and pressure drop values during condensation and evaporation of CO2 were obtained at different operating conditions for flow inside micropipes. Reynolds number (ReD) ranged between 2000 and 15000. The dimensional analysis technique was utilized to develop correlations for Nus
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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17. SIMULATION OF BRAZED PLATE HEAT EXCHANGERS FOR CASCADE VAPOR COMPRESSION SISTEM / SIMULAÇÃO DE TROCADORES DE CALOR DE PLACAS PARA SISTEMAS DE REFRIGERAÇÃO EM CASCATA
Desenvolveu-se um modelo de simulação para trocadores de calor de placas soldadas (BPHE ¿ Brazed Plate Heat Exchanger) operando em regime permanente em um sistema de refrigeração em cascata por compressão de vapor, ou seja, condensador, trocador de calor intermediário (ou condensador em cascata) e evaporador. O modelo adota o método de análise local
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
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18. 3D-CFD simulation and neural network model for the j and f factors of the wavy fin-and-flat tube heat exchangers
A three dimensional (3D) computational fluid dynamics (CFD) simulation and a neural network model are presented to estimate the behaviors of the Colburn factor (j) and the Fanning friction factor (f) for wavy fin - and - flat tube (WFFT) heat exchangers. Effects of the five geometrical factors of fin pitch, fin height, fin length, fin thickness, and wavy amp
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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19. Application of adaptive control in a refrigeration system to improve performance
This paper reports an experimental investigation using adaptive control in a refrigeration system. This system is composed basically of a semi-hermetic compressor, concentric tubes heat exchangers, the condenser and evaporator, and thermostatic expansion valve (TXV). The refrigerant used in the refrigeration system was the HCFC-22 and also an AC frequency in
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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20. A new correlation for single and two-phase flow pressure drop in round tubes with twisted-tape inserts
Twisted-tape inserts are frequently used in heat exchangers as a passive and inexpensive heat transfer enhancement method. However, their use results not only heat transfer coefficient increments, but also pressure drop penalties. The present study analyses the literature on single and two-phase frictional pressure drop inside tubes with twisted-tape inserts
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011
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21. Desenvolvimento de metodologia para controle das larvas de Limnoperna fortunei com o uso de radiação ultravioleta e seus impactos sobre Microscystis aeruginosa potencialmente presentes na água superficial
L. fortunei (Dunker, 1857), commonly known as golden mussel comes from Southeast Asia. It might have been unintentionally introduced in our water sources through ballast water, with the first records in 1991, in Rio de la Plata, near Buenos Aires, Argentina, South America. In Brazil it was first seen in 1998, in Jacuí Delta, opposite Porto Alegre¿s harbor.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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22. Projeto de dispositivos de microcanais utilizando o método de otimização topológica. / Design of microchannel devices applying the topology optimization method.
Este trabalho propõe o estudo do projeto de dispositivos baseados em microcanais de fluido, tais como difusores, misturadores, válvulas, e trocadores de calor, através da aplicação do Método de Otimização Topológica (MOT). O MOT é um método computacional que permite obter um projeto otimizado de um sistema, através da distribuição de uma quanti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/10/2010
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23. CFD analysis of tube-fin 'no-frost' evaporators
The purpose of this paper is to assess some aspects of the design of evaporators for household refrigeration appliances using Computational Fluid Dynamics (CFD). The evaporators under study are tube-fin 'no-frost' heat exchangers with forced convection on the air-side and a staggered tube configuration. The calculation methodology was verified against experi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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24. Non-newtonian flow and pressure drop of pineapple juice in a plate heat exchanger
The study of non-Newtonian flow in plate heat exchangers (PHEs) is of great importance for the food industry. The objective of this work was to study the pressure drop of pineapple juice in a PHE with 50º chevron plates. Density and flow properties of pineapple juice were determined and correlated with temperature (17.4 < T < 85.8ºC) and soluble solids con
Brazilian Journal of Chemical Engineering. Publicado em: 2010-12