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Title: Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720

Abstract

The primary role of the Solar Energy Projects Department II (4720) is the development, evaluation, and testing of line-focus solar thermal technology. This report of FY 79 progress and accomplishments is divided into two parts: (1) Component and Subsystem Development including the design and analysis of collector modules, their components, and associated materials and processes, and (2) Systems and Applications Development, involving larger configurations of solar thermal line-focus systems. The emphasis is on parabolic troughs, but significant efforts on hemispherical bowls, compound parabolic collectors, and dishes for the Solar Total Energy Project are also described.

Authors:
; ;  [1]
  1. eds.
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
5250270
Report Number(s):
SAND-80-0865(Rev.)
DOE Contract Number:
AC04-76DP00789
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; CONCENTRATING COLLECTORS; DEMONSTRATION PROGRAMS; RESEARCH PROGRAMS; FIXED MIRROR COLLECTORS; PARABOLIC TROUGH COLLECTORS; SOLAR PROCESS HEAT; SOLAR THERMAL POWER PLANTS; TOTAL ENERGY SYSTEMS; AUXILIARY SYSTEMS; BLACK CHROME; COATINGS; COMPOUND PARABOLIC CONCENTRATORS; DESIGN; FAILURES; FOUNDATIONS; HAIL; IRRIGATION; MANAGEMENT; MATERIALS; MIRRORS; PARABOLIC DISH COLLECTORS; PERFORMANCE; PERFORMANCE TESTING; POWER SYSTEMS; RANKINE CYCLE POWER SYSTEMS; SANDIA LABORATORIES; SOLAR RECEIVERS; SOLAR REFLECTORS; SOLAR TRACKING; SOLAR WATER PUMPS; STEAM TURBINES; SYSTEMS ANALYSIS; THERMAL ANALYSIS; THERMAL ENERGY STORAGE EQUIPMENT; WIND LOADS; ATMOSPHERIC PRECIPITATIONS; BLACK COATINGS; DYNAMIC LOADS; ENERGY; EQUIPMENT; HEAT; MACHINERY; MECHANICAL STRUCTURES; NATIONAL ORGANIZATIONS; PARABOLIC COLLECTORS; POWER PLANTS; PROCESS HEAT; PUMPS; SOLAR COLLECTORS; SOLAR CONCENTRATORS; SOLAR EQUIPMENT; SOLAR POWER PLANTS; SUPPORTS; TESTING; TURBINES; TURBOMACHINERY; US AEC; US DOE; US ERDA; US ORGANIZATIONS; WATER PUMPS; 140700* - Solar Thermal Power Systems; 141000 - Solar Collectors & Concentrators; 140704 - Solar Thermal Power Systems- Total Energy & Hybrid Systems- (1980-)

Citation Formats

Bergeron, K D, Champion, R L, and Hunke, R W. Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720. United States: N. p., 1980. Web. doi:10.2172/5250270.
Bergeron, K D, Champion, R L, & Hunke, R W. Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720. United States. doi:10.2172/5250270.
Bergeron, K D, Champion, R L, and Hunke, R W. Tue . "Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720". United States. doi:10.2172/5250270. https://www.osti.gov/servlets/purl/5250270.
@article{osti_5250270,
title = {Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720},
author = {Bergeron, K D and Champion, R L and Hunke, R W},
abstractNote = {The primary role of the Solar Energy Projects Department II (4720) is the development, evaluation, and testing of line-focus solar thermal technology. This report of FY 79 progress and accomplishments is divided into two parts: (1) Component and Subsystem Development including the design and analysis of collector modules, their components, and associated materials and processes, and (2) Systems and Applications Development, involving larger configurations of solar thermal line-focus systems. The emphasis is on parabolic troughs, but significant efforts on hemispherical bowls, compound parabolic collectors, and dishes for the Solar Total Energy Project are also described.},
doi = {10.2172/5250270},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 01 00:00:00 EST 1980},
month = {Tue Apr 01 00:00:00 EST 1980}
}

Technical Report:

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  • Acurex Corporation has recently completed the design review, fabrication assembly, and testing of an evacuated receiver for its 3021 parabolic trough solar collector. The receivers were installed at Sandia National Laboratories' Distributed Receiver Test Facility for testing by Sandia. The evacuated receivers are believed to represent a significant improvement in the state of the art of receiver technology and feature simplicity, low cost, and high collection efficiency. The background of the design is discussed detailing the criteria applied to arrive at the design. Tooling used to produce the prototype receivers is discussed as well as fabrication methods and problems encountered.more » Future improvements are detailed. Initial bench tests have verified the performance improvements expected over nonevacuated receivers.« less
  • The DOE Solar Thermal Technology Program is developing five types of solar thermal concepts, each aimed at specific applications: the central receiver, parabolic dish, parabolic trough, hemispherical bowl, and salt-gradient solar pond. After brief descriptions of each concept, their potential applications and current status are discussed. FY 81 accomplishments are then briefly summarized for each of the five concepts, and research and advanced development efforts are briefly discussed in the areas of materials research, fuels and chemicals, and applied thermal research. (LEW)
  • After a brief description of the Solar Thermal Technology Program, its goals, objectives, and benefits, progress is reported in the five technologies addressed by the program: central receiver, parabolic dish, parabolic trough, hemispherical bowl, and salt-gradient solar ponds. Component technology development and systems experiments and analyses are reported for the central receiver, parabolic dish, and parabolic trough concepts. Also reported are test programs at the Central Receiver Test Facility, Parabolic Dish Test Site support to dish development, and experiments at test facilities supporting parabolic trough program. Research on hemispherical bowl and salt-gradient solar ponds is briefly summarized, including the Crosbytonmore » Solar Power Project (hemispherical bowl) and the Salton Sea Project (solar pond). Also reported are research and advanced development efforts in materials research, fuels and chemicals, and applied thermal research, and supporting programs, including the Solar Thermal Test Facilities Users Association activities, environmental control studies, and solar thermal insolation assessment. (LEW)« less
  • Initial candidate methods for protecting the polymeric glazing and the metallic layer from degradation by ultraviolet light (uv) and candidate new polymeric materials have been identified. The characteristics of photodegradation permit the application of methods involving both photon absorption and transfer of electronic energy. Generally, photostabilizers for polymers are classified according to their mode of action: uv light absorbers, excited state quenchers, antioxidants, and hydroperoxide decomposers. We have selected the radical copolymerization of monomeric uv absorbers with methylmethacrylate and related monomers for our initial system. The first step is to evaluate absorbers mixed with the polymethylmethacrylate system. Mirrors are mademore » using Corning 7809 glass as a substrate onto which a thin silver film is deposited, and the modified polymeric films are then cast from solution onto the silver. Mirrors are characterized by measuring the hemispherical reflectance as a function of wavelength and by determining the solar-weighted hemispherical reflectance. Mirrors are exposed to environmental degradation using accelerated weathering devices and outdoor exposure. We have demonstrated that uv absorbers added to polymethylmethacrylate can improve the weathering performance of mirrors. A benzotriazole absorber has performed best. Experiments on the present task also show that benzotriazole absorbers stabilize polyester films. Unstabilized polyacrylonitrile glazings have also performed well. We have observed that prior treatment of the mirror with uv light can improve the adhesion. We have also observed that the process for silver deposition influences the initial reflectivity of silver mirrors.« less
  • Separate abstracts were prepared for 45 of the 49 papers presented. Four papers were previously entered into the data base. (WHK)