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  • 1975-1979  (4)
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  • 1
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    The dilemma of future electric power demand (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Dim prospects are held out for continued exponential growth rates in the generation and use of electric power worldwide and in many local areas, extrapolating from current trends and common projections. While acknowledging the unique advantages of electric power use, the article points out the 30% level of efficiency in conversion of other forms of energy to electrical energy, with huge volumes of wasted energy plus thermal pollution. Even growth at a fixed rate is found problematical, with future needs exhausting water and land resources and fossil fuels in time. Alleviation of the situation by shifting much of the load to still unproven technologies is considered cautiously
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Energy Quarterly; 6; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparative performance of solar thermal power generation concepts (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A performance comparison is made between the central receiver system (power tower) and a distributed system using either dishes or troughs and lines to transport fluids to the power station. These systems were analyzed at a rated capacity of 30 MW of thermal energy delivered in the form of superheated steam at 538 C (1000 F) and 68 atm (1000 psia), using consistent weather data, collector surface waviness, pointing error, and electric conversion efficiency. The comparisons include technical considerations for component requirements, land utilization, and annual thermal energy collection rates. The relative merits of different representative systems are dependent upon the overall conversion as expressed in the form of performance factors in this paper. These factors are essentially indices of the relative performance effectiveness for different concepts based upon unit collector area. These performance factors enable further economic tradeoff studies of systems to be made by comparing them with projected production costs for these systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Conference on Intersociety Energy Conversion Engineering; Sep 12, 1976 - Sep 17, 1976; State Line, NV
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Solar Stirling power generation - Systems analysis and preliminary tests (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The feasibility of an electric power generation system utilizing a sun-tracking parabolic concentrator and a Stirling engine/linear alternator is being evaluated. Performance predictions and cost analysis of a proposed large distributed system are discussed. Design details and preliminary test results are presented for a 9.5 ft diameter parabolic dish at the Jet Propulsion Laboratory (Caltech) Table Mountain Test Facility. Low temperature calorimetric measurements were conducted to evaluate the concentrator performance, and a helium flow system is being used to test the solar receiver at anticipated working fluid temperatures (up to 650 or 1200 C) to evaluate the receiver thermal performance. The receiver body is designed to adapt to a free-piston Stirling engine which powers a linear alternator assembly for direct electric power generation. During the next phase of the program, experiments with an engine and receiver integrated into the concentrator assembly are planned.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: International Solar Energy Society; Jun 06, 1977 - Jun 10, 1977; Orlando, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Solar receiver performance of point focusing collector system (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The solar receiver performance of cavity receivers and external receivers used in dispersed solar power systems was evaluated for the temperature range 300-1300 C. Several parameters of receiver and concentrator are examined. It was found that cavity receivers are generally more efficient than external receivers, especially at high temperatures which require a large heat transfer area. The effects of variation in the ratio of receiver area to aperture area are considered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ASME PAPER 78-WA/SOL-5 , American Society of Mechanical Engineers, Winter Annual Meeting; Dec 10, 1978 - Dec 15, 1978; San Francisco, CA
    Format: text
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    NASA TECHNICAL REPORTS
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