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167
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Introduction
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August 2007 - July 2012
Publications
Publications (25)
For the prediction of convective heat loss from solar concentrating receiver cavities a number of empirical correlations exist. Geometry and the inclination angle determine the degree to which natural convection can infiltrate the cavity and remove stably stratified hot air out through the aperture. This makes the task of defining characteristic le...
A new tubular cavity receiver for direct steam generation, 'SG4', has been build and tested on-sun based on integrated optical and thermal modelling. The new receiver achieved an average thermal efficiency of 97.1±2.1% across several hours of testing, and reduced the losses by more than half, compared to the modelled performance of the previous SG3...
The aim of this paper is to present a transient one-dimensional (1D) radial immersed coil
heat exchanger model that accounts for the effect that geometry and operating conditions
have on heat transfer performance. Insights gained through its use in both an analysis of
experimental data and an implementation in the simulation environment TRNSYS are...
Temperature distribution in nonaxisymmetrically concentrating solar thermal receivers tubes is calculated for the steady-state solution with a Gauss-Seidel iteration in cylindrical coordinates. The classical plane-biharmonic thermoelastic approach to nonaxisymmetrically heated tube stress is applied. Calculation of the dominant axial thermal stress...
In a solar power tower plant, the role of the heliostat aiming strategy is to control the radiative flux distribution at the receiver surface to avoid thermally induced damage, while minimising spillage losses and maximising the receiver thermal efficiency. Flux limitations arise from factors including the heat transfer fluid stability limits, and...
The applicability of the cylindrical arrangement of vertical tube banks is evaluated for liquid sodium concentrating solar thermal receivers and compared with a molten salt reference case through a series of parametric studies. It is shown that sodium receivers experience less thermo-elastic stress load and can operate under higher flux which prese...
We evaluate the impact of varying idealised radiative sources on the resulting thermo-elastic stress distribution and magnitude in cylindrical receiver tubes.
Bladed receivers use conventional receiver tube-banks rearranged into bladed structures to increase thermal and optical retention. This paper explores the impact of the blades upon the receiver's convective losses for both windy and no-wind conditions. The modelling work suggests that the addition of blades increases convection levels but by accept...
Linear-elastic stress in nonaxisymmetrically heated receiver tubes is calculated with analytical equations from Timoshenko & Goodier (1951) and compared against results from a Finite Volume Method (FVM) OpenFOAM R model. Principal component and equivalent stress is shown for receiver tubes carrying molten salt and liquid sodium. It is found that co...
Thermal Stress in Sodium Receiver Tubes
Three high-temperature solar receiver design concepts are being evaluated as part of the Australian Solar Thermal Research Initiative (ASTRI): a flux-optimised sodium receiver, a falling particle receiver, and an expanding-vortex particle receiver. Preliminary results from performance modelling of each concept are presented. For the falling particl...
Presentation of the Multi-objective optimisation method developed as part of the ASTRI receiver project in order to determine optimised geometries for high temperature liquid sodium receivers.
This paper presents an analysis of tube wall heat transfer using a simplified two-dimensional model. Wall conduction is modelled using the laplacianFoam solver from OpenFOAM R with boundary conditions representing internal/external convection and radiation. Using this model, the effect of sodium as a working fluid is compared with molten salt, and...
An integrated model for an axisymmetric helical-coil tubular cavity receiver is presented, incorporating optical ray-tracing for incident solar flux, radiosity analysis for thermal emissions, computational fluid dynamics for external convection, and a one-dimensional hydrodynamic model for internal flow-boiling of water. A receiver efficiency of 98...
Current implementation of Immersed Coil Heat Exchangers (IHX) into Solar Domestic Hot Water (SDHW) systems use simple guidelines for dimensioning their surface area based on an intended solar collector area -or range thereof. The literature from whence these guidelines come (1970s and 80s) are based on experiments with different types of IHX (coppe...
Although there is a notable move towards fresh water stations in the European markets, using the cheaper internal solutions of smooth or finned coil heat exchangers for smaller solar thermal system storage devices still dominates. Varying significantly in type and geometry, the functions used to account for heat transfer are possibly outdated and i...
