17 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Weathering"  
Results: 1 - 17
open access

Exchange of lyotropic series cations by micaceous vermiculite and its weathering products determined by electron microscopy and radiochemical analysis. Final technical report, June 1, 1965-October 31, 1978

Description: Micaceous vermiculite was found to be ubiquitous in soils, sediments, and aerosol mineral dusts and to adsorb fission product ions, particularly /sup 137/Cs/sup +/ and /sup 90/Sr/sup 2 +/. Crystallographic wedge zones (imaged by ultramicrotomy and electron microscopy) in micaceous vermiculite effected tight fixation of Cs/sup +/. Lowering of mica layer charge occurred in local areas, electronoscopically imaged by use of blister-swelling cations. Nuclear fission particle tracks of U enhanced tra… more
Date: January 1, 1978
Creator: Jackson, M L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photovoltaic solar panel resistance to simulated hail. Low-Cost Solar Array Project

Description: As part of the Jet Propulsion Laboratory's Low-Cost Solar Array Project, test methods have been evaluated and procedures developed for testing photovoltaic flat-plate solar cell modules for resistance to impact by hailstones. Testing has included the use of simulated hailstones (frozen ice spheres projected at terminal velocity), steel balls, and other projectile types applied with three loading methods: pneumatic gun, gravity drop, and static loading. Results are presented that compare the adv… more
Date: October 15, 1978
Creator: Moore, D. & Wilson, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Large scale production task: low cost silicon solar array project. Final technical report

Description: Several design concepts were evaluated and compared with respect to potential for low cost and automation, protection against weathering, potential for array efficiency as a function of weight and area, potential for design flexibility and exposure to electrical breakdown or leakage to ground. This evaluation program narrowed attention to design concepts involving glass as the primary structural and weather resistant component of the module. The leading specific design structure consisted of th… more
Date: September 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of coatings for protection of coal during transport and storage. Final report, December 15, 1977--September 15, 1978

Description: The use of coatings to prevent dust emissions and leachates from coal stockpiles was studied under sponsorship of the Department of Energy, Division of Environmental Control Technology. The coatings considered included compositions formed of a filler such as pulverized coal and a binder consisting of a combination of waxes and plastics. Various latex emulsions, both with and without fillers, were also evaluated. The purpose of coal coatings is to seal the surface of the stockpile. This prevents… more
Date: November 1, 1978
Creator: Kromrey, R V; Scheffee, R S; DePasquale, J A & Valentine, R S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solar-powered steam generator heliostat. Final report

Description: A small-size central-receiver-type solar energy collecting system delivering commercial grade steam is analyzed and a wind avoidance type heliostat designed, built, and successfully tested. The heliostat design effort is described, including reflecting surface materials and measurements, optic considerations and mirror field arrangements, mechanical analysis and fabrication techniques, and economics and cost effectiveness. Measurements of normal incident solar energy at Upton, N.Y., are reporte… more
Date: December 1, 1978
Creator: Cottingham, J G
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Long-term weathering effects on the thermal performance of the Lennox/Honeywell (liquid) solar collector

Description: The test procedures used and the results obtained during the evaluation test program of the Lennox/Honeywell double covered liquid solar collector are presented. The tests were performed under simulated conditions, following long-term exposure to natural weathering conditions. The Lennox/Honeywell collector is a flat-plate solar collector. The absorber plate is steel with copper tubes bonded on the upper surface, and is coated with black chrome with an absorptivity factor of .95 and emissivity … more
Date: November 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Terrestrial solar cell module automated array assembly, Task 4. Final report

Description: It was proposed to establish a cost effective design and manufacturing process that would produce solar cell modules capable of meeting the JPL qualification test criteria. The basic design consisted of a glass/polyvinyl butyral/Mylar laminate mounted in either aluminum or stainless steel frames. To achieve a satisfactory power output margin, the production 36 three-inch solar cell design was expanded to 41 cells interconnected with standard dual redundant contacts. Aluminum paste as a back con… more
Date: January 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Accelerated/abbreviated test methods, Study 4 of Task 3 (encapsulation) of the Low-Cost Silicon Solar Array Project. Seventh quarterly progress report, October--December 1977

Description: Successful predictions for the rate of loss of properties on outdoor exposure were made for plastic films based upon accelerated data. Degradation data for samples exposed beginning in winter, summer, or fall are discussed. The electrical performance of solar cells in Universal Test Specimens exposed outdoors is also reported. (MHR)
Date: January 3, 1978
Creator: Kolyer, J. M. & Mann, N. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary report of the Solar Reflective Materials Technology Workshop

Description: The Solar Reflective Materials Technology Workshop sponsored by the Department of Energy and organized by the Pacific Northwest Laboratory and the Solar Energy Research Institute was held on March 28--30, 1978, in Denver, Colorado. The two and one-half day seminar/workshop was attended by over 95 people representing some 60 private companies and government laboratories. The purpose of the workshop was to assess the ''state-of-the-art'' of solar reflector materials technology, define current mir… more
Date: October 1, 1978
Creator: Lind, M.A. & Ault, L.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photovoltaic module design, qualification and testing specification

Description: This specification establishes minimum design, qualification and acceptance requirements for terrestrial solar cell modules suitable for incorporation in photovoltaic array applications in the 20 kW to 500 kW range, such as defined by Department of Energy PRDA EM-D-04-0038. Both mandatory and recommended requirement levels for selected performance criteria have been specified for modules within these arrays. As applicable, the manufacturer/contractor shall be responsible for generation and sele… more
Date: March 24, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Block IV solar cell module design and test specification for residential applications

Description: This specification provides near-term design, qualification and acceptance requirements for terrestrial solar cell modules suitable for incorporation in photovoltaic power sources (2 kW to 10 kW) applied to single family residential installations. Requirement levels and recommended design limits for selected performance criteria have been specified for modules intended principally for rooftop installations. Modules satisfying the requirements of this specification fall into one of two categorie… more
Date: November 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal performance evaluation of the Calmac (liquid) solar collector

Description: The procedures used and the results obtained during the evaluation test program on the Calmac Manufacturing Company, S.N.1, (Liquid) Solar Collector are presented. The flat-plate collector uses water as the working fluid. The absorber plate is aluminum with plastic tubes coated with Urethane black. The glazing consists of a single .040'' Fiberglas reinforced polyester (Kalwall). The collector weight is 78.5 pounds with overall external dimensions of approximately 50.3'' x 98… more
Date: June 23, 1978
Creator: Usher, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Weathering characteristics of potential solar reflector materials: a survey of the literature

Description: A review of the available literature on the weatherability/durability of materials with possible applications in solar reflectors is summarized. A number of techniques used to weather solar materials are reviewed. These include both natural and simulated weathering. Little correlation has been shown to exist between natural and accelerated weathering, and much work needs to be done before results of accelerated aging tests can be used with confidence to predict material lifetimes under outdoors… more
Date: September 1, 1978
Creator: Hampton, H. L. & Lind, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement techniques and instruments suitable for life-prediction testing of photovoltaic arrays. Interim report

Description: The validation of a service life of 20 years for low-cost photovoltaic arrays must be accomplished through accelerated life-prediction tests. A methodology for such tests has been developed in a preceding study. The results discussed consist of the initial identification and assessment of all known measurement techniques and instruments that might be used in these life-prediction tests. Array failure modes, relevant materials property changes, and primary degradation mechanisms are discussed as… more
Date: January 15, 1978
Creator: Noel, G. T.; Sliemers, F. A.; Deringer, G. C.; Wood, V. E.; Wilkes, K. E.; Gaines, G. B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Heliostat glass survey and analysis

Description: A comprehensive survey of both foreign and domestic sources of low distortion, high transmission flat glass with a nominal thickness of 3 mm was undertaken. The purpose of the survey was to determine the characteristics, availability and cost of glass for use in second surface heliostat mirrors for the Barstow pilot plant and future commercial central receiver plants. Information obtained from the manufacturers and the results of investigations performed at Sandia Laboratories at Albuquerque an… more
Date: September 1, 1978
Creator: Lind, M.A. & Rusin, J.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Accelerated/abbreviated test methods, Study 4 of Task 3 (encapsulation) of the Low-Cost Silicon Solar Array Project. Eighth quarterly progress report, January--March 1978

Description: To meet the goals of the LSSA program, solar cell encapsulants must provide protection for 20 years. Consequently, the objective of the present program is to develop methodology for making confident predictions of encapsulant performance at any exposure site in the U.S.A. During the first year of the program, inherent weatherability was studied. Inherent weatherability is controlled by the three weather factors common to all exposure sites: insolation, temperature, and humidity. Emphasis was fo… more
Date: April 3, 1978
Creator: Kolyer, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen