Search Results - subject:"Numerical modelling"

Influences on the thermal efficiency of energy piles

Cecinato, Francesco; Loveridge, Fleur A. - In: Energy 82 (2015) C, pp. 1021-1033

Energy piles have recently emerged as a viable alternative to borehole heat exchangers, but their energy efficiency has so far seen little research. In this work, a finite element numerical model is developed for the accurate 3D analysis of transient diffusive and convective heat exchange...

Persistent link: https://www.econbiz.de/10011209492

Energy production from tidal currents in an estuary: A comparative study of floating and bottom-fixed turbines

Sánchez, M.; Carballo, R.; Ramos, V.; Iglesias, G. - In: Energy 77 (2014) C, pp. 802-811

In a tidal stream project the selection of the most appropriate device is of major importance. The aim of this work is to investigate the difference between two tidal farms, one with floating TSTs (Tidal Stream Turbines), the other with bottom-fixed TSTs, in terms of annual performance and its...

Persistent link: https://www.econbiz.de/10011077676

Vortical structures in the wake of the savonius wind turbine by the discrete vortex method

Afungchui, David; Kamoun, Badreddinne; Helali, Ali - In: Renewable Energy 69 (2014) C, pp. 174-179

This paper treats the vortex shedding phenomenon of a savonius wind turbine, whose knowledge is primordial in correctly calculating the airloads on the blades. The specific aim being to numerically predict the disposition and geometry of the vortical structures in the wake of the savonius rotor...

Persistent link: https://www.econbiz.de/10010803741

Wave-power absorption from a finite array of oscillating wave surge converters

Renzi, E.; Abdolali, A.; Bellotti, G.; Dias, F. - In: Renewable Energy 63 (2014) C, pp. 55-68

Semi-analytical and fully numerical modelling is developed in the framework of the inviscid potential flow theory to …

Persistent link: https://www.econbiz.de/10010806820

Experimental and numerical analysis of gas distribution in molten carbonate fuel cells

Schenone, Corrado; Borelli, Davide - In: Applied Energy 122 (2014) C, pp. 216-236

. Thus, the numerical modelling can be effectively used during FC plants’ design to analyze the flow distribution, by taking … into account devices and systems in order to improve the uniformity of the distribution. In this way, the numerical … modelling permits to avoid expensive and time-consuming experiments, and to optimize, with a limited effort, the manifolds …

Persistent link: https://www.econbiz.de/10010789882

Evaluation of the production of tidal stream energy in an inlet channel by coupling field data and numerical modelling

Pacheco, A.; Ferreira, Ó.; Carballo, R.; Iglesias, G. - In: Energy 71 (2014) C, pp. 104-117

The paper combines hydrographic surveying techniques with numerical modelling to evaluate the spatial and temporal …

Persistent link: https://www.econbiz.de/10011054834

Large eddy simulation of a two-phase reacting swirl flow inside a cement cyclone

Mikulčić, Hrvoje; Vujanović, Milan; Ashhab, Moh'd Sami; … - In: Energy 75 (2014) C, pp. 89-96

This work presents a numerical study of the highly swirled gas–solid flow inside a cement cyclone. The computational fluid dynamics – CFD simulation for continuum fluid flow and heat exchange was used for the investigation. The Eulearian–Lagrangian approach was used to describe the...

Persistent link: https://www.econbiz.de/10011054882

Making adsorptive chillers faster by a proper choice of adsorption isobar shape: Comparison of optimal and real adsorbents

Okunev, Boris N.; Aristov, Yuri I. - In: Energy 76 (2014) C, pp. 400-405

This paper addresses the first quantitative evaluation of the effect of adsorbent isobar shape on the dynamics of AC (adsorptive chiller) cycle. The numerical and experimental studies of this effect have been performed to answer the question “Which practical enhancement of the AC specific...

Persistent link: https://www.econbiz.de/10011055811

Parametric study on the advantages of weather-predicted control algorithm of free cooling ventilation system

Medved, Sašo; Babnik, Miha; Vidrih, Boris; Arkar, Ciril - In: Energy 73 (2014) C, pp. 80-87

Predicted climate changes and the increased intensity of urban heat islands, as well as population aging, will increase the energy demand for the cooling of buildings in the future. However, the energy demand for cooling can be efficiently reduced by low-exergy free-cooling systems, which use...

Persistent link: https://www.econbiz.de/10011055947

Optimisation of turbine-induced damping for an OWC wave energy converter using a RANS–VOF numerical model

López, I.; Pereiras, B.; Castro, F.; Iglesias, G. - In: Applied Energy 127 (2014) C, pp. 105-114

The performance of an oscillating water column (OWC) wave energy converter depends on many factors, among which the incident wave conditions, the tidal level or the coupling between the chamber and the air turbine. In this work a 2D numerical model based on the RANS equations and the VOF surface...

Persistent link: https://www.econbiz.de/10011040507