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  • 1
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    Chemical/Hydrogen Energy Storage Systems (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Electrochemical and thermochemical systems are reviewed. Chemical heat pumps, end-use applications and systems studies, and storage systems and materials are also discussed.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Courtesy Associates, Inc. Proc. of the DOE Thermal and Chem. Storage Ann. Contractor's Rev. Meeting; p 145-149
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Summary of static load test of the Mod-0 blade (1978)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A static load test was performed on the spare Mod-0 wind turbine blade to define load transfer at the root end of the blade, and to validate stress analysis of this particular type of blade construction (frame and stringer). Analysis of the load transfer from the airfoil skin to the shank tube predicted a step change in spanwise stress in the airfoil skin at station 81.5 inches (STA 81.5). For flatwise bending a 40% reduction in spanwise stress was predicted, and for edgewise bending a 6% reduction. Experimental results verified the 40% reduction for flatwise bending, but indicated about a 30% reduction for edgewise bending.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Wind Turbine Structural Dyn.; p 109-116
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Status of Rockwell-ERC high efficiency solar cell programs (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Programs aimed at developing large area, high efficiency GaAs heteroface cells for low concentration space applications and high concentration terrestrial applications as well as other programs aimed at developing high efficiency multicolor devices for use in similar applications are described. An additional program aimed at achieving improved power to weight ratio by parting thin film solar cells from their growth substrates prior to their incorporation into an array assembly is also described. There is potential for multiple reuse of the substrates which could lead to reduced costs for such devices. Highlights of these programs and their interrelated contributions toward the goals of reducing specific weight, volume and cost of photovoltaic space power systems are discussed. Overall goals are summarized and current programs and their funding sources are listed.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol.; p 113-119
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Comparison of upwind and downwind rotor operation of the DOE/NASA 100-kW MOD-0 wind turbine (1981)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Tests were conducted on a 38m diameter horizontal axis wind turbine, which had first a rotor downwind of the supporting truss tower and then upwind of the tower. Aside from the placement of the rotor and the direction of rotation of the drive train, the wind turbine was identical for both tests. Three aspects of the test results are compared: rotor blade bending loads, rotor teeter response, and nacelle yaw moments. As a result of the tests, it is shown that while mean flatwise bending moments were unaffected by the placement of the rotor, cyclic flatwise bending tended to increase with wind speed for the downwind rotor while remaining somewhat uniform with wind speed for the upwind rotor, reflecting the effects of increased flow disturbance for downwind rotor. Rotor teeter response was not significantly affected by the rotor location relative to the tower, but appears to reflect reduced teeter stability near rated wind speed for both configurations. Teeter stability appears to return above rated wind speed, however. Nacelle yaw moments are higher for the upwind rotor but do not indicate significant design problems for either configuration.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Wind Turbine Dyn.; p 225-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Summer performance results obtained from simultaneously testing ten solar collectors outdoors (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Ten solar collectors were simultaneously tested outdoors. Efficiency data were correlated using a method that separates solar variables (flux, incident angle) from the desired performance parameters (heat loss, absorbtance, transmittance) which are unique to a given collector design. Tests were conducted on both clear and moderately cloudy days. Correlating data in the above manner, a 2-glass, black paint collector exhibited a decrease in efficiency of 5 percentage points relative to the baseline data for an exposure time of 2 years, 4 months. Condensation on the collector glazing was thought to be a contributing factor in this efficiency change.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-X-73594 , E-9066
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Teetered, tip-controlled rotor: Preliminary test results from Mod-0 100-kW experimental wind turbine (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Results of tests conducted using the MOD-0 100 kW experimental wind turbine are evaluated. The teetered rotor significantly decreased loads on the yaw drive mechanism and reduced blade cyclic flapwise bending moments by 25 percent at the 20 percent span location when compared to the rigid hub rotor. The teetered hub performed well, but impacted the teeter stops on occasion as wind speed and/or direction varied rapidly. The tip-controlled rotor performed satisfactorily with some expected loss of control when compared to the full span pitchable blade. The performance results indicate that a review of techniques used to calculate rotor power is in order.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-81445 , DOE/NASA/1028-80/26 , E-365 , Wind Energy Conf.; Apr 09, 1980 - Apr 11, 1980; Boulder, CO; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 7
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    Wind Turbine Structural Dynamics (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A workshop on wind turbine structural dynamics was held to review and document current United States work on the dynamic behavior of large wind turbines, primarily of the horizontal-axis type, and to identify and discuss other wind turbine configurations that may have lower cost and weight. Information was exchanged on the following topics: (1) Methods for calculating dynamic loads; (2) Aeroelasticity stability (3) Wind loads, both steady and transient; (4) Critical design conditions; (5) Drive train dynamics; and (6) Behavior of operating wind turbines.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CP-2034 , DOE-CONF-771148 , E-9518 , Nov 15, 1977 - Nov 17, 1977
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    The effect of yaw on horizontal axis wind turbine loading and performance (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The Mod-0 100 kW experimental wind turbine was tested to determine the effects of yaw on rotor power, blade loads and teeter response. The wind turbine was operated for extended periods at yaw angles up to 49 deg to define average or mean response to yaw. It was determined that the effect of yaw on rotor power can be approximated by the cube of the velocity normal to the rotor disc as long as the yaw angle is less than 30 deg. Blade bending loads were relatively unaffected by yaw, but teeter angle increased with wind speed as the magnitude of the yaw angle exceeded 30 deg indicating a potential for teeter stop impacts at large yaw angles. No other adverse effects due to yaw were noted during the tests.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-82778 , E-1108 , DOE/NASA/20320-35 , NAS 1.15:82778 , Biennial Wind Energy Conf. and Workshop; Oct 05, 1980 - Oct 07, 1980; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Performance correlations of five solar collectors tested simultaneously outdoors (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Collector thermal efficiency, and efficiency degradation with time were measured for 5 flat-plate solar collectors tested simultaneously in an outdoor solar collector test facility. Results indicate that by using collector performance parameters which account for diffuse insolation, outdoor data recorded on 'cloudy' days can be used as a measure of performance, as long as the ratio of direct to total insolation exceeds approximately 0.6. These outdoor results also show good agreement with thermal efficiency data obtained indoors in a solar simulator. Significant efficiency degradation occurred on only one of the five collectors exposed to outdoor conditions for a period of one to two years.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Joint Conference on Sharing the Sun: Solar Technology in the Seventies; Aug 15, 1976 - Aug 20, 1976; Winnipeg; Canada
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    Performance correlations of five solar collectors tested simultaneously outdoors (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Collector thermal efficiency, and efficiency degradation with time were measured for 5 flat-plate solar collectors tested simultaneously in an outdoor solar collector test facility. Results indicate that by using collector performance parameters which account for diffuse isolation, outdoor data recorded on cloud days can be used as a measure of performance, as long as the ratio of direct to total insolation exceeds approximately 0.6. These outdoor results also show good agreement with thermal efficiency data obtained indoors in a solar simulator. Significant efficiency degradation occurred on only one of the five collectors exposed to outdoor conditions for a period of one to two years.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-TM-X-73546 , E-8982 , Joint Conf. of the Intern. Solar Energy Soc. and the Solar Energy Soc. of Canada; Aug 15, 1976 - Aug 20, 1976; Winnipeg; Canada
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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