https://eva.fing.edu.uy/pluginfile.php/55828/mod_resource/content/1/kalogiru.pdf

Solar thermal collectors and applications

Membrane distillation: A comprehensive review

A Review on Photovoltaic/Thermal Hybrid Solar Technology

A framework for better understanding membrane distillation separation process

To improve the performance of particle image velocimetry in measuring instantaneous velocity fields, direct cross-correlation of image fields can be used in place of auto-correlation methods of interrogation of double- or multiple-exposure recordings. With improved speed of photographic recording and increased resolution of video array detectors, cross-correlation methods of interrogation of successive single-exposure frames can be used to measure the separation of pairs of particle images between successive frames. By knowing the extent of image shifting used in a multiple-exposure and by a priori knowledge of the mean flow-field, the cross-correlation of different sized interrogation spots with known separation can be optimized in terms of spatial resolution, detection rate, accuracy and reliability.

Theory of cross-correlation analysis of PIV images : Image analysis as measuring technique in flows

A novel new design of a roof-integrated solar concentrating collector is presented. It provides a thermal system for rooftop applications such as domestic hot water, industrial process heat and solar air conditioning for commercial, industrial and institutional buildings. This paper describes the thermal performance of a new low-cost solar thermal micro-concentrating collector (MCT), which uses linear Fresnel reflectors, a nd is designed to operate at temperatures up to 220°C. The modules of this collector system are approximately 3 meters long by 1 meter wide and 0.3 meters high. The objective of the study is to optimize the design to maximise the overall thermal efficiency. The absorber is contained in a sealed enclosure to minimise convective losses. The main heat losses are due to natural convection inside the enclosure and radiation heat transfer from the absorber tube. In this paper we present the results of a computational investigation of radiation and convection heat transfer in order to understand the heat loss mechanisms. A computational model for the prototype collector has been developed using ANSYS-CFX, a commercial computational fluid dynamics software package. The numerical results are compared to experimental measurements of the heat loss from the absorber, and flow visualization within the cavity. The efficiency of the collector is established on the basis of ray tracing and heat loss analysis.

A Numerical and Experimental Study of a Novel Roof Integrated Solar Micro-concentrating Collector

Concentrating solar thermal systems offer a promising method for large scale solar energy collection. Although concentrating collectors are generally thought of as large-scale stand-alone systems, there is a huge opportunity to use novel concentrating solar thermal systems for rooftop applications such as domestic hot water, industrial process heat and solar air conditioning for commercial, industrial and institutional buildings. This paper describes the thermal performance of a new low-cost solar thermal micro-concentrating collector (MCT), which uses linear Fresnel reflectors, and is designed to operate at temperatures up to 220°C. The modules of this collector system are approximately 3 meters long by 1 meter wide and 0.3 meters high. The objective of the study is to optimize the design to maximise the overall thermal efficiency. The absorber is contained in a sealed enclosure to minimise convective losses. The main heat losses are due to natural convection inside the enclosure and radiation heat transfer from the absorber tube. In this paper we present the results of a computational investigation of radiation and convection heat transfer in order to understand the heat loss mechanisms. A computational model for the prototype collector has been developed using ANSYS-CFX, a commercial computational fluid dynamics software package. The numerical results are compared to experimental measurements of the heat loss from the absorber, and flow visualization within the cavity. The efficiency of the collector is established on the basis of ray tracing and heat loss analysis.

/pdf/thermal-performance-of-a-roof-integrated-solar-micro-xxcl7uyswf.pdf

Thermal Performance of a Roof Integrated Solar Micro-Concentrating Collector

In high power amplifiers, the understanding of heat transfer phenomena is critical to ensure components operate within acceptable temperature limits. System operational reliability has been shown to reduce considerably when individual components are allowed to exceed maximum-rated junction temperatures. Of particular interest in this study are high power amplifiers used in the telecommunications industry. In such applications, heat sinks in forced airflow have traditionally been used to provide cooling due to their low cost and ongoing maintenance requirements. Here, the causes of failure of an amplifier circuit board used for high-frequency signal transmission have been closely studied. Analysis of failure data gathered over a four-year period was used to identify the main component level causes of system failure, and preliminary experiments were conducted to estimate junction temperatures of these components under field conditions. Subsequent experiments were then carried out to measure the the...

An Experimental and Computational Study of Heat Transfer in High Power Amplifiers

Solid-liquid phase change modelling of metallic sodium for application in solar thermal power plants

This paper describes the Compact Linear Fresnel Reflector (CLFR) concept being developed for installation at the Stanwell power station in Queensland as part of an Australian Greenhouse Office showcase project. The CLFR system is based on a number of parallel linear receivers elevated on towers that are close enough for individual mirror rows to have the option of directing reflected solar radiation to two alternative receivers. This additional variable in reflector orientation provides the means for much more densely packed arrays. Patterns of alternating mirror inclination can be set up such that shading and blocking are almost eliminated while ground coverage is maximised. The avoidance of large mirror row spacings and receiver heights is an important issue in determining the cost of ground preparation, array substructure cost, tower structure cost, steam line thermal losses, and steam line cost. The CLFR still delivers the benefits of the classical Fresnel reflector system, namely small reflector size, low structural cost, fixed receiver position without moving joints, and allowance for non-cylindrical receiver geometries

Graham Morrison

Papers

A Numerical and Experimental Study of a Novel Roof Integrated Solar Micro-concentrating Collector

Thermal Performance of a Roof Integrated Solar Micro-Concentrating Collector

An Experimental and Computational Study of Heat Transfer in High Power Amplifiers

Solid-liquid phase change modelling of metallic sodium for application in solar thermal power plants

Stanwell power station project