Evaporator
Mostrando 13-24 de 62 artigos, teses e dissertações.
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13. Análise do coeficiente global de transferência de calor de um evaporador de grande porte / Analysis of the global coefficient of heat transfer of a large evaporator
Evaporadores do tipo escoamento cruzado com tubos aletados são utilizados em câmaras frigoríficas e túneis de congelamento para congelar ou resfriar alimentos. Estes evaporadores têm como principais características a baixa temperatura de operação e a extensa área de troca térmica. O escoamento é do tipo cruzado, o ar escoa no lado externo entre as
Publicado em: 2010
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14. Simulação numérica de evaporadores utilizados em aplicações frigoríficas / Numerical simulation of evaporators used in frigorific applications
O presente trabalho trata do estudo do modelo computacional, EVSIM, que permite a simulação e caracterização da transferência de calor e massa entre o ar úmido externo e o refrigerante em evaporadores utilizados em sistemas frigoríficos e condicionadores de ar domésticos. O modelo é capaz de levar em conta a distribuição do refrigerante ao longo d
Publicado em: 2010
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15. Evaluation of the sugar inversion in an evaporation system (faling film evaporator with promotor of film). / Avaliação da inversão da sacarose em um sistema de evaporação (evaporador de filme descendente com promotor de película).
In this work the evaluation of sucrose inversion in a system formed by falling film Evaporator with Promoter of film is presented. The modeling was made considering: mass and enthalpy balances and the kinetic of inversion in the evaporation tube. The mean parameters investigated were: kinetic constant (k), evaporation rate (mv), concentration of total sugars
Publicado em: 2008
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16. Compósitos cerâmicos porosos de alumina - zircônia para aplicação em sistemas de controle térmico para satélites: obtenção e caracterização / Alumina-zirconia porous ceramic composites for application in satellite thermal control systems: obtaining and characterization
To control the temperature of satellites are used various thermal control heat systems. The Loop Heat pipe (LHP) are being developed at the DEM (Space Mechanic and Control Division) of the INPE (National Institute for Space Research) an apparatus for passive heat control of the satellites components. The main components of the LHP system are: capillary evapo
Publicado em: 2008
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17. MODELAGEM DE EVAPORADORES TIPO PLACAS PARA SISTEMAS CONDICIONADORES DE AR AUTOMOTIVOS / MODELING OF EVAPORATORS TYPE LAMINATED PLATE FOR AUTOMOTIVE AIR CONDITIONING SYSTEMS
A simulation model for automotive brazed laminate plate evaporators, for humid air cooling, was developed. The model adopts the local analysis method, where the heat exchanger is divided into a number of elemental control volumes, for which the equations of heat transfer and conservation of energy are applied. In order to determine the local heat transfer co
Publicado em: 2008
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18. Análise de termossifões que operam com mercúrio em altas temperaturas
Thermosyphons are high thermal conductivity devices that can transfer high quantities of heat when subjected to small temperature gradients. In its most simple form, a thermosyphon is a hollow evacuated metal pipe, charged by a pre-determined amount of an appropriate working fluid. It can be divided into three main sections: evaporator, where the heat is del
Publicado em: 2008
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19. Estudo da evaporaÃÃo de lixiviados de aterros sanitÃrios como alternativa tecnolÃgica de tratamento: testes em bancada
The leachate from landfill contains high pollution load and its composition gives large amounts of ammonia, chlorides, recalcitrant substances, organic and inorganic compounds. Such waste can cause negative effects on the environment and interfere with the performance of biological processes for their degradation. The choice of technology appropriate treatme
Publicado em: 2008
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20. Development of ammonia-water absorption refrigeration systems simulator and its application in a project of a system moved by exhaust gases of diesel engine / Aperfeiçoamento de um simulador de sistemas de refrigeração de absorção agua-amonia e sua aplicação para projeto de um sistema movido a gas de escape de motor diesel
This work shows the development of an ammonia-water absorption refrigeration system pre-existing simulation program, which uses diesel engine exhaust gases from a diesel-generator group as energy source. The project was implemented in four stages. An initial design of its components involved solely thermodynamic relations, and was based on the arbitration of
Publicado em: 2008
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21. Effectiveness-ntu computation with a mathematical model for cross-flow heat exchangers
Due to the wide range of design possibilities, simple manufactured, low maintenance and low cost, cross-flow heat exchangers are extensively used in the petroleum, petrochemical, air conditioning, food storage, and others industries. In this paper a mathematical model for cross-flow heat exchangers with complex flow arrangements for determining epsilon -NTU
Brazilian Journal of Chemical Engineering. Publicado em: 2007-12
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22. Concentração de tocoferois e fitoesterois a partir do destilado desodorizado de oleos vegetais atraves do processo de destilação molecular / Tocopherols and phytoesterols concentration from vegetable oil deodorized distillater through molecular distillation process
Tocopherols and phytosterols are minority compounds present in vegetables oils. Tocopherols show vitaminic activities and antioxidant properties. Vitamin E is composed by four tocopherols (a, b, g and d) and four tocotrienols (a, b, g and d). The phytosterols have anticholesterolemic and anticarcinogenic properties. The main natural sources of tocopherols an
Publicado em: 2007
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23. AvaliaÃÃo econÃmica da substituiÃÃo de um chiller de compressÃo por um chiller de absorÃÃo alimentado por coletores solares com base em mediÃÃes em um prÃdio da Chesf em Recife
The perspective of rising costs for electrical energy and fossil fuels, together with more efficient solar colectors and absorption chillers, stimulates for the retaking of the analisys towards the utilization of solar refrigeration systems, mainly in regions with good insolation characteristcs, like Northeast Brazil . Considering this context, this document
Publicado em: 2007
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24. Estudo experimental de um controle adaptativo para um sistema de refrigeração / Experimental study of a refrigeration system using an adaptative control
This research deals with a experimental study of vapor compression refrigeration system, with variable speed compressor using adaptative fuzzy control, comparing its results with On-Off and PI control. The experimental equipment used is composed of a semi-hermetic compressor, concentric tube evaporator and condenser, thermostatic expansion valve with manual
Publicado em: 2006