Radiation hardness of Ga0.5In0.5 P/GaAs tandem solar cells

The radiation hardness of a two-junction monolithic Ga sub 0.5 In sub 0.5 P/GaAs cell with tunnel junction interconnect was investigated. Related single junction cells were also studied to identify the origins of the radiation losses. The optimal design of the cell is discussed. The air mass efficiency of an optimized tandem cell after irradiation with 10(exp 15) cm (-2) 1 MeV electrons is estimated to be 20 percent using currently available technology

Study on Reduction of Cooling Energy for Air Conditioning by Flexible Space Compartmentalization in Residential Houses

An increase consumption of electricity in the domestic sector is increasing sharply due to the high demand of air conditioning usage in homes. This situation can be observed worldwide, thus the emissions of greenhouse effect gases is increasing as a consequence of the high energy consumption in home cooling systems. Air conditioning consumes a lot of energy in domestic electricity use and there is a huge interest of finding ways to reduce this energy consumption. The use of air conditioner for many hours during sleeping time at night is considered to be one of the moments when a lot of energy is wasted to cool the whole room when the real area that needs to be cooled at that moment is the one covering the bed. One way of trying to reduce the energy use by air conditioner at night it is to reduce the cooling space so that the cooling energy required by the air conditioning unit can be decreased

Research & scholarly achievements, July 1, 1982 - June 30, 1983

Annual summary of scholarly activities at UCF for the period from July 1, 1982 to June 30, 1983. This report highlights the contributions to scholarship by the Faculty during this period, including books and monographs, articles, creative works, presentations, grants and contracts

Gasification of Densified Sludge and Wastepaper in a Downdraft Packed-Bed Gasifier

The co-disposal of densified sludge and wastepaper in a co-current flow packed bed gasifier represents new application of the thermal gasification process. Advantages of this technology include lower costs than other incineration or pyrolysis technologies, simple construction and operation, and the ability to use a variety of fuels including agricultural wastes and other biomass materials in addition to densified sludge and wastepaper

Annual Report: Photovoltaic Subcontract Program FY 1991

This report summarizes the progress of the Photovoltaic (PV) Subcontract Program of the Solar Energy Research Institute (SERI) from October 1, 1989 through September 30, 1990. The PV Subcontract Program is responsible for managing the subcontracted portion of SERI's PV Advanced Research and Development Project. In fiscal year 1990, this included more than 54 subcontracts with a total annualized funding of approximately $11.9 million. Approximately two-thirds of the subcontracts were with universities at a total funding of nearly$3.3 million. The six technical sections of the report cover the main areas of the subcontract program: the Amorphous Silicon Research Project, Polycrystalline Thin Films, Crystalline Silicon Materials Research, High-Efficiency Concepts, the New Ideas Program, and the University Participation Program. Technical summaries of each of the subcontracted programs provide a discussion of approaches, major accomplishments in FY 1990, and future research directions. Another section introduces the PVMaT project and reports on its progress

Space Photovoltaic Research and Technology 1986. High Efficiency, Space Environment, and Array Technology

The conference provided a forum to assess the progress made, the problems remaining, and the strategy for the future of photovoltaic research. Cell research and technology, space environmental effects, array technology and applications were discussed

Space Photovoltaic Research and Technology, 1988. High Efficiency, Space Environment, and Array Technology

The 9th Space Photovoltaic Research and Technology conference was held at the NASA Lewis Research Center from April 19 to 21, 1988. The papers and workshop summaries report remarkable progress on a wide variety of approaches in space photovoltaics, for both near and far term applications. Among the former is the recently developed high efficiency GaAs/Ge cell, which formed the focus of a workshop discussion on heteroepitaxial cells. Still aimed at the long term, but with a significant payoff in a new mission capability, are InP cells, with their potentially dramatic improvement in radiation resistance. Approaches to near term, array specific powers exceeding 130 W/kg are also reported, and advanced concentrator panel technology with the potential to achieve over 250 W/sq m is beginning to take shape

Workshop on an Assessment of Gas-Side Fouling in Fossil Fuel Exhaust Environments

The state of the art of gas side fouling in fossil fuel exhaust environments was assessed. Heat recovery applications were emphasized. The deleterious effects of gas side fouling including increased energy consumption, increased material losses, and loss of production were identified

Energy: A continuing bibliography with indexes, issue 38

This bibliography lists 1367 reports, articles and other documents introduced into the NASA scientific and technical information system from April 1, 1983 through June 30, 1983