Browsing by Subject "Heat--Transmission"
Now showing items 21-40 of 43
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Heat and moisture insulation by means of air curtains: application to refrigerated chambers
(Elsevier, 2016-08)
Article
Open AccessThe present study is devoted to the determination of the efficiency of air curtain units (ACUs) applied to heat and moisture insulation of refrigerated chambers. A detailed study of the fluid dynamics and heat and mass ... -
Heat transfer at the nanoscale : The hyperbolic heat equation
(Universitat Politècnica de Catalunya, 2015-07)
Bachelor thesis
Open AccessThe interest of taking technology to increasingly small scales has required great changes and advances in science. In particular, the well-known Fourier's law (very useful in large scales) has proved to be not accurate ... -
Heat transfer enhancement in air by means of acoustic fields
(Universitat Politècnica de Catalunya, 2022-07-07)
Master thesis
Open AccessConvection is the most important heat transfer mechanism in air, and every heat source cools down thanks to it. However, this phenomenon relies on buoyancy and this does not exist in microgravity conditions. For this reason, ... -
Indus3es: test rig calibration and initial operation of an absorption heat transformer
(Universitat Politècnica de Catalunya, 2018-01-28)
Bachelor thesis
Open AccessThe absorption heat transformer is technology known for years, which heats water to high temperature from a heat supply at a medium temperature. This heat supply is usually waste heat coming from a chemical or petrochemical ... -
Modelització estocàstica en temps continu. Aplicació a les dinàmiques de calor d’un edifici
(Universitat Politècnica de Catalunya, 2020-01)
Bachelor thesis
Open AccessEn l actual context d emergència climàtica, és necessari analitzar l eficiència energètica dels edificis, incloent les dinàmiques de calor. A més, també cal determinar quins elements poden modificar la temperatura interna ... -
Numerical and experimental investigation of a vertical LiBr falling film absorber considering wave regimes and in presence of mist flow
(2016-11-01)
Article
Open AccessThe absorber represents the most critical component in absorption systems and one of the key issues. In this component complex heat and mass transfer phenomena during the absorption process takes place simultaneously. For ... -
Numerical simulation of wind flow around a parabolic trough solar collector
(2013-07-01)
Article
Restricted access - publisher's policyThe use of parabolic trough solar technology in solar power plants has been increased in recent years. Such devices are located in open terrain and can be the subject of strong winds. As a result, the stability of these ... -
Numerical study of heat transfer from a synthetic impinging jet with a detailed model of the actuator membrane
(2019-02-02)
Article
Open AccessSynthetic jets are produced by the oscillatory movement of a membrane inside a cavity, causing the fluid to enter and leave through a small orifice. The present study is focused on investigating the cooling capabilities ... -
Oil condition effects over the heat transfer performance in CSP parabolic trough power plants
(Universitat Politècnica de Catalunya / Universitat de Barcelona, 2015-10)
Master thesis
Restricted access - confidentiality agreement -
On the CFD&HT of the flow around a parabolic trough solar collector under real working conditions
(2013)
Conference report
Open AccessParabolic trough solar collector is currently one of the most mature and prominent solar applications for production of electricity. These systems are usually located in open terrain where strong winds may occur and affect ... -
On the role of a centrifugal instability in the vortex-induced vibration of a two-degrees of freedom circular cylinder at moderate Reynolds numbers
(2018)
Conference report
Restricted access - publisher's policyIn this work, the formation and role of a centrifugal instability in the VIV phenomenon at moderate Reynolds numbers are investigated for the ¿rst time. Large eddy simulations of a low mass ratio (m = 2.6) two-degree-of-freedom ... -
Particulate immersed boundary method for complex fluid-particle interaction problems with heat transfer
(2016-01-01)
Article
Open AccessIn our recent work (Zhang et al., 2015), a Particulate Immersed Boundary Method (PIBM) for simulating fluid-particle multiphase flow was proposed and assessed in both two- and three-dimensional applications. In this study, ... -
Phragmén-Lindelöf alternative for an exact heat conduction equation with delay
(2013-05-01)
Article
Restricted access - publisher's policyIn this paper we investigate the spatial behavior of the solutions for a theory for the heat conduction with one delay term. We obtain a Phragm én- Lindelöf type alternative. That is, the solutions either decay in an ... -
Resolució numèrica de les equacions de conservació de la massa, quantitat de moviment i energia. Anàlisis de fluxos en geometries complexes
(Universitat Politècnica de Catalunya, 2021-10-21)
Bachelor thesis
Open AccessEl present estudi gira entorn de la implementació de codis en llenguatge C++ capa¸cos de resoldre problemes de dinàmica de fluids i transferència de calor i massa, així com el posterior anàlisi i impressió dels resultats ... -
Solid-liquid phase change with turbulent flow
(Begell House, 2012)
Conference report
Restricted access - publisher's policyThe present paper describes a numerical simulation of the solid-liquid phase change Computational Fluid Dynamics and Heat Transfer (CFD&HT) model developed in order to account for natural convection inside Phase Change ... -
Study for the computational resolution of conservation equations of mass, momentum and energy. Possible application to different aeronautical and industrial engineering problems: Case 5E
(Universitat Politècnica de Catalunya, 2017-06-10)
Bachelor thesis
Restricted access - author's decisionAnàlisis previ d'antecedents i state-of-the-art. Plantejament del fenomen físic, formulació matemàtica i desenvolupament de les eines de simulació numèrica necessàries. Verificació dels codis i de les solucions numèriques. ... -
Study for the numerical resolution of conservation equations of mass, momentum and energy to be applied on buoyancy-driven flows in enclosed cavities
(Universitat Politècnica de Catalunya, 2015-07)
Bachelor thesis
Open AccessEl presente estudio introduce al lector en el campo de los intercambiadores de calor. Estos serán definidos y clasificados, presentando los tipos más comunes en el sector industrial y describiendo sus principios y ... -
Study for the numerical resolution of the Navier-Stokes equations using the Fractional Step Method
(Universitat Politècnica de Catalunya, 2018-06-10)
Bachelor thesis
Open AccessThis work is denominated Study for the numerical resolution of the Navier-Stokes equations using the Fractional Step Method. It is divided into 7 Chapters and 1 Annex. Chapter 1 presents the objectives, scope, requirements ... -
Sustainable design of a thermosolar electricity generation power plant in Burkina Faso
(2018-11-15)
Article
Open AccessResearch towards renewable energy sources is of great relevance in the pursue of environmental impact reduction and to decrease the dependency on fossil fuels. In high solar irradiation locations, the use of Concentrating ... -
Three dimensional numerical simulations of combined conduction and radiation in transparent insulation material
(2012)
Conference lecture
Restricted access - publisher's policyA coupled radiative and conductive three dimensional numerical model of transparent insulation material (TIM) is presented and the simulation results are compared with experimental results found in the literature. Since ...
