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  • 1
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    Solar pond (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Shallow pools of liquid to collect low-temperature solar generated thermal energy are described. Narrow elongated trenches, grouped together over a wide area, are lined with a heat-absorbing black liner. The heat-absorbing liquid is kept separate from the thermal energy removing fluid by means such as clear polyethylene material. The covering for the pond may be a fluid or solid. If the covering is a fluid, fire fighting foam, continuously generated, or siloons are used to keep the surface covering clean and insulated. If the thermal energy removing fluid is a gas, a fluid insulation layer contained in a flat polyethlene tubing is used to cover the pond. The side of the tube directed towards the sun is treated to block out ultraviolet radiation and trap in infrared radiation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Low cost solar energy collection system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector having an extended, curved sawtooth contoured surface covered with a metallized polymeric reflecting material, reflected solar energy to a movably supported collector that was kept at the concentrated line focus of the reflector primary. Efficient utilization leading to high temperatures from the reflected solar energy was obtained by cylindrical shaped secondary reflectors that directed off-angle energy to the absorber pipe.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Portable linear-focused solar thermal energy collecting system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A solar heat collection system is provided by utilizing a line-focusing device that is effectively a cylindrically curved concentrator within a protected environment formed by a transparent inflatable casing. A target, such as a fluid or gas carrying conduit is positioned within or near the casing containing the concentrator, at the line focus of the concentrator. The casing can be inflated at the site of use by a low pressure air supply to form a unitary light weight structure. The collector, including casing, concentrator and target, is readily transportable and can be used either at ground level or on rooftops. The inflatable concentrator can be replaced with a rigid metal or other concentrator while maintaining the novel advantages of the whole solar heat collection system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 4
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    Primary reflector for solar energy collection systems (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector is disclosed which has an extended curved sawtooth-contoured surface covered with a metalized polymeric reflecting material. The device reflects solar energy to a movably supported collector that is kept at the concentrated line focus of the reflector primary. The primary reflector may be constructed by a process utilizing well-known freeway paving machinery.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 5
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    Solar energy collection system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector having an extended curved sawtooth-contoured surface covered with a metalized polymeric reflecting material, reflects solar energy to a movably supported collector that is kept at the concentrated line focus reflector primary. The primary reflector may be constructed by a process utilizing well known freeway paving machinery. The solar energy absorber is preferably a fluid transporting pipe. Efficient utilization leading to high temperatures from the reflected solar energy is obtained by cylindrical shaped secondary reflectors that direct off-angle energy to the absorber pipe. A seriatim arrangement of cylindrical secondary reflector stages and spot-forming reflector stages produces a high temperature solar energy collection system of greater efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Primary reflector for solar energy collection systems and method of making same (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solar energy is reflected to a movably supported collector that is kept at the concentrated line focus of the reflector primary by a fixed, linear, ground-based primary reflector having an extended curved sawtooth contoured surface covered with a metalized polymeric reflecting material. The primary reflector was constructed by a process utilizing well-known freeway paving machinery.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Low to high temperature energy conversion system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for converting heat energy from low temperature heat sources to higher temperature was developed. It consists of a decomposition chamber in which ammonia is decomposed into hydrogen and nitrogen by absorbing heat of decomposition from a low temperature energy source. A recombination reaction then takes place which increases the temperature of a fluid significantly. The system is of use for the efficient operation of compact or low capital investment turbine driven electrical generators, or in other applications, to enable chemical reactions that have a critical lower temperature to be used. The system also recovers heat energy from low temperature heat sources, such as solar collectors or geothermal sources, and converts it to high temperatures.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 8
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    Three-dimensional tracking solar energy concentrator and method for making same (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A three dimensional tracking solar energy concentrator, consisting of a stretched aluminized polymeric membrane supported by a hoop, was presented. The system is sturdy enough to withstand expected windage forces and precipitation. It can provide the high temperature output needed by central station power plants for power production in the multi-megawatt range.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 9
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    A simple approach to metal hydride alloy optimization (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Certain metals and related alloys can combine with hydrogen in a reversible fashion, so that on being heated, they release a portion of the gas. Such materials may find application in the large scale storage of hydrogen. Metal and alloys which show high dissociation pressure at low temperatures, and low endothermic heat of dissociation, and are therefore desirable for hydrogen storage, give values of the Hildebrand-Scott solubility parameter that lie between 100-118 Hildebrands, (Ref. 1), close to that of dissociated hydrogen. All of the less practical storage systems give much lower values of the solubility parameter. By using the Hildebrand solubility parameter as a criterion, and applying the mixing rule to combinations of known alloys and solid solutions, correlations are made to optimize alloy compositions and maximize hydrogen storage capacity.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Miami Univ. 1st World Hydrogen Energy Conf. Proc., Vol. 2; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
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