scholarly journals Description of the University of Texas at Arlington Solar Energy Research Facility photovoltaic/thermal residential system

1979 ◽  
Author(s):  
G. Darkazalli
Keyword(s):  
Solar Energy ◽  
Research Facility ◽  
Energy Research ◽  
University Of Texas ◽  
The University

Heliostat Attitude Control Strategy in the Solar Energy Research Facility of Valparaiso University

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Shahin S. Nudehi ◽  
G. Scott Duncan ◽  
Luke J. Venstrom
Keyword(s):  
Solar Energy ◽  
Control Strategy ◽  
Attitude Control ◽  
Tracking Error ◽  
Feedback Gain ◽  
Research Facility ◽  
Energy Research ◽  
Nonlinear Dynamic Model ◽  
Concentrated Solar Energy ◽  
Tracking Strategy

In this paper, a continuous tracking strategy for the heliostat in the James S. Markiewicz Concentrated Solar Energy Research Facility at Valparaiso University is developed. A model of the nonlinear dynamics of the heliostat motion is developed and the open-loop control strategy is presented. Asymptotic stability of the heliostat control using the Lyapunov and LaSalle’s theorems was proven. Simulations using the nonlinear dynamic model are presented and interpreted to identify the feedback gain that maximizes the time response of the heliostat without introducing oscillations in its motion. Finally, the control strategy is put to the test during summertime operation. The data presented show that the tracking strategy has an root mean square (RMS) tracking error of 0.058 mrad, where the error is defined as the difference between the desired and actual heliostat positions. Images of the aperture of a high-temperature solar receiver over 8 h of testing are also presented to qualitatively demonstrate the success of the tracking strategy.

scholarly journals Evaluation of five various technologies of PV panels for Si production using Sahara sand silica source

2019 ◽  
Vol 9 (2) ◽  
pp. 36-45
Author(s):  
Mohamed Mostefai ◽  
Yahia Miloud ◽  
Abdallah Miloudi
Keyword(s):  
Solar Energy ◽  
Temperature Measurement ◽  
Solar Irradiation ◽  
Energy Research ◽  
Important Data ◽  
Evaluation Systems ◽  
Silica Source ◽  
Pv Module ◽  
Temperature Measurement System ◽  
The University

The Sahara Solar Breeder (SSB) project is a joint Japanese-Algerian universities project to utilise the plentiful sand and solar energy in the Sahara desert. In the context of the SSB project, a Sahara Solar Energy Research Center was created at the University of Saida in Algeria. This centre is equipped with the meteorological monitoring system, the outside photovoltaic panels evaluation systems and the underground temperature measurement system. In this paper, a description of these types of equipment of this centre is presented. Also, some important data such as irradiance, temperature, energy, I–V curves and underground temperature measurement are presented and analysed. Finally, a discussion on the usefulness of these data for the SSB project will be discussed. Keywords: Sahara Solar Breeder project, solar irradiation, air temperature, underground temperature, PV module, I–V curve

Industry without Smokestacks

2017 ◽  
Author(s):  
Andrew M. Busch
Keyword(s):  
Knowledge Workers ◽  
University Research ◽  
Research Facility ◽  
Environmental Amenities ◽  
Natural Landscape ◽  
University Of Texas ◽  
Close Relationship ◽  
University Leaders ◽  
The University ◽  
The City

This chapter looks at Austin’s emergent tech industry in the 1950s and 1960s and the role that the University of Texas at Austin played in that grow. It argues that the city promoted a natural landscape and environmental amenities aimed at attracting knowledge workers and non-industrial businesses. A close relationship between city leaders and university leaders emerged, personified in J. Neils Thompson who directed a university research facility and also served on the chamber of commerce. Tracor emerged as Austin’s first nationally-recognized spinoff company. The city and region grew dramatically.

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