Oil Refrigerant
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Mechanical and Thermo-Physical Properties of Short Glass Fiber Reinforced Polybutylene Terephthalate upon Aging in Lubricant/Refrigerant Mixture
In this study, the relationship between structure and mechanical properties of aged PBT composite was investigated. Short glass fiber reinforced PBT composites were subjected to aging tests in environments typically found in hermetic compressors. Diffusion kinetics were addressed by a periodic control of samples weight, and samples aged in oil presented mass
Mat. Res.. Publicado em: 29/09/2016
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2. Dynamics of gas bubble growth in oil-refrigerant mixtures under isothermal depressurization
This paper proposes a numerical model to predict the growth of gaseous refrigerant bubbles in oil-refrigerant mixtures with high contents of oil subjected to isothermal depressurization. The model considers an Elementary Cell (EC) in which a spherical bubble is surrounded by a concentric and spherical liquid layer containing a finite amount of dissolved liqu
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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3. Mathematical Modeling of the Ester Oil-Refrigerant R134a Mixture Two-Phase Flow with Foam Formation Through a Small Diameter Tube
This work presents a mathematical modeling to study the ester oil ISO VG-10-refrigerant R134a mixture two-phase flow with foam formation through a 3.22 mm ID tube. Based on experimental visualization results, the flow is divided into three regions: a single phase flow at the inlet of the tube; an intermediary bubbly flow region; and a foam flow region at the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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4. Viscosity behavior of mixtures of CO2 and lubricant oil
Experimental data on the viscosity of mixtures of CO2 and lubricant oil were acquired and correlated using an excess-property approach based on the classical Eyring liquid viscosity model. Three oils of different types and viscosity grades (alkylbenzene AB ISO 32, mineral MO ISO 50 and polyol ester POE ISO 68) were evaluated at temperatures ranging from 36.5
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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5. Foam flow of oil-refrigerant R12 mixture in a small diameter tube
This paper presents an experimental investigation of the mineral oil ISO VG10-refrigerant R12 mixture flow with foam formation in a straight horizontal 3.22 mm ID, 6.0 m long tube. An experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Tests w
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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6. SIMULAÇÃO DE UM COMPRESSOR HERMÉTICO ALTERNATIVO OPERANDO EM REGIME TRANSIENTE / SIMULATION OF A RECIPROCATING HERMETIC COMPRESSOR OPERATING IN TRANSIENT REGIME
O presente trabalho trata da simulação de um compressor hermético alternativo operando em regime transiente. O modelo desenvolvido expande, para a simulação do regime transiente, de modelos de regime permanente existentes na literatura. No presente modelo o sistema é dividido em volumes de controle (motor, compressor, muflas, câmaras de sucção e de
Publicado em: 2003
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7. Uso de hidrocarbonetos em sistema frigorifico de pequeno porte
Since the stratrosphere ozone depletion has been observed many studies have been developed to find substances to replace chlorine compounds of chlorofluorocarbons. Hydrocarbon mixtures (propanelisobutane) were indicated because they are natural refrigerants. This work presents the experimental avaliation of a small freezer s behaviour working with R12 and wi
Publicado em: 1996