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  • 11
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    Thermal Performance of Stirling Cycle Cryocolers: A Comparison of JPL-Tested Coolers (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Spacecraft cryocoolers continue to attract interest n the space science community. To date, many Stirlling cycle cryocoolers have been characterized by JPL in a number of performance areas including thermal performance.
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 12
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    Inconsistencies in the Understanding of Solder Joint Reliability Physics (1997)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Over the years, many analytical and experimental research studies have aimed to improve the state-of-the-art assessment of solder joint integrity from a physics-of-failure perspective. Although much progress has been made, there still exist many inconsistent and even contradictory correlations and conclusions. Before discussing some of the prominent inconsistencies found in the literature, this paper reviews the fundamental physics underlying the nature of solder failure...Using the complex constitutive properties of solder, fundamental mechanical and thermomechanical proccesses can be modeled to demonstrate some of the inconsistencies in the literature.
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    NASA TECHNICAL REPORTS
  • 13
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    Thermal Design of a Radiator for a Mars Lander Atmospheric Sensor (1998)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
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    NASA TECHNICAL REPORTS
  • 14
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    Observations of solar-cell metallization corrosion (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Engineering Sciences Area of the Jet Propulsion Laboratory (JPL) Flat-Plate Solar Array Project is performing long term environmental tests on photovoltaic modules at Wyle Laboratories in Huntsville, Alabama. Some modules have been exposed to 85 C/85% RH and 40 C/93% RH for up to 280 days. Other modules undergoing temperature-only exposures ( 3% RH) at 85 C and 100 C have been tested for more than 180 days. At least two modules of each design type are exposed to each environment - one with, and the other without a 100-mA forward bias. Degradation is both visually observed and electrically monitored. Visual observations of changes in appearance are recorded at each inspection time. Significant visual observations relating to metallization corrosion (and/or metallization-induced corrosion) include discoloration (yellowing and browning) of grid lines, migration of grid line material into the encapsulation (blossoming), the appearance of rainbow-like diffraction patterns on the grid lines, and brown spots on collectors and grid lines. All of these observations were recorded for electrically biased modules in the 280-day tests with humidity.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the Flat-Plate Solar Array Res. Forum on Photovoltaic Metallization Systems; p 137-146
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Thermal Performance of Stirling-Cycle Cryocoolers: A Comparison of JPL-Tested Coolers (1994)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Engineering (General)
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    NASA TECHNICAL REPORTS
  • 16
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    Vibration and Resonance Behavior of Back-to-Back Stirling-Cycle Cryocoolers (1994)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Engineering (General)
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  • 17
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    Interconnect fatigue design for terrestrial photovoltaic modules (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of comprehensive investigation of interconnect fatigue that has led to the definition of useful reliability-design and life-prediction algorithms are presented. Experimental data indicate that the classical strain-cycle (fatigue) curve for the interconnect material is a good model of mean interconnect fatigue performance, but it fails to account for the broad statistical scatter, which is critical to reliability prediction. To fill this shortcoming the classical fatigue curve is combined with experimental cumulative interconnect failure rate data to yield statistical fatigue curves (having failure probability as a parameter) which enable (1) the prediction of cumulative interconnect failures during the design life of an array field, and (2) the unambiguous--ie., quantitative--interpretation of data from field-service qualification (accelerated thermal cycling) tests. Optimal interconnect cost-reliability design algorithms are derived based on minimizing the cost of energy over the design life of the array field.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168813 , JPL-PUB-81-111 , DOE/JPL-1012-62 , JPL-1012-62 , NAS 1.26:168813
    Format: application/pdf
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  • 18
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    Predicting the Reliability of Solar-Cell Interconnections (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The reduction of life expectancy by thermal cycling calculated during design. Connections between solar cells critical parts of solarcell arrays generating electric power. Reliability affects life expectancy of modules, panels, and arrays. Used to predict stress-cycle lifetimes of such structures as arches, walkways, cylindrical ribbing of aircraft fuselages and submarine hulls, and pipeline expansion loops. Testing costs reduced by about 90 percent.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-15976 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 574
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  • 19
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    Electrical isolation design and electrochemical corrosion in thin-film photovoltaic modules (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The development of a proposed wet insulation-resistance qualification test specification for production-line modules is presented. Laboratory research directed toward understanding and eliminating problems associated with electrical isolation of thin-film photovoltaic module circuitry is presented. Test results serve to measure module field life as limited by electrochemical corrosion degradation mechanisms. Current module-level research covering encapsulant voltage withstand capability is also described, and suggestions for improving module electrical isolation are offered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Sept. 26-30, 1988; Las Vegas, NV; United States
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  • 20
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    Defect design of insulation systems for photovoltaic modules (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A defect-design approach to sizing electrical insulation systems for terrestrial photovoltaic modules is presented. It consists of gathering voltage-breakdown statistics on various thicknesses of candidate insulation films where, for a designated voltage, module failure probabilities for enumerated thickness and number-of-layer film combinations are calculated. Cost analysis then selects the most economical insulation system. A manufacturing yield problem is solved to exemplify the technique. Results for unaged Mylar suggest using fewer layers of thicker films. Defect design incorporates effects of flaws in optimal insulation system selection, and obviates choosing a tolerable failure rate, since the optimization process accomplishes that. Exposure to weathering and voltage stress reduces the voltage-withstanding capability of module insulation films. Defect design, applied to aged polyester films, promises to yield reliable, cost-optimal insulation systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
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