Tom Sadeghi | Aerospace | ENERGY PRODUCTION AND CONVERSION
Includes specific energy conversion systems, e.g., fuel
cells; global sources of energy; geophysical conversion; and windpower. For
related information see also 07 Aircraft Propulsion and Power, 20 Spacecraft
Propulsion and Power, and 28 Propellants and Fuels. N91-12151*# George Mason
Univ., Fairfax, VA. Dept. of Electrical and Computer Engineering. LASER
ANNEALING OF AMORPHOUS/POLY: SILICON SOLAR CELL MATERIAL FLIGHT EXPERIMENT
Final Report, Oct. 1989 - Jun. 1990 Eric E. Cole Jun. 1990 31 p (Grant
NAG5-1294) (NASA-CR-187370; NAS 1.26:187370) Avail; NTIS HC/MF A03 CSCL 10A The
preliminary design proposed for the microelectronics materials processing
equipment is presented. An overall mission profile, description of all
processing steps, analysis methods and measurement techniques, data acquisition
and storage, and a preview of the experimental hardware are included. The goal
of the project is to investigate the viability of material processing of
semiconductor microelectronics materials in a micro-gravity environment. The
two key processes are examined: (1) Rapid Thermal Annealing (RTA) of
semiconductor thin films and damaged solar cells, and (2) thin film deposition
using a filament evaporator.
The RTA process will be used to obtain higher
quality crystalline properties from amorphous/poly-silicon films. RTA methods
can also be used to repair radiation-damaged solar cells. On earth this
technique is commonly used to anneal semiconductor films after
ion-implantation. The damage to the crystal lattice is similar to the defects
found in solar cells which have been exposed to high-energy particle
bombardment. Author N91-12152# Technische Univ., Delft (Netherlands). Lab. for
Measurement and Control. AN INTEGRATED DYNAMIC MODEL OF A FLEXIBLE WIND TURBINE
Peter M. M. Bongers, Wim A. A. Bierbooms, Sjoerd Dijkstra, and Theo vanholten
(Stork Product Engineering, Amsterdam, Netherlands) 1990 122 p (Grants
ENW3-0044-NL; NOVEM-41/33-020/10) (MEMT-6; UDC-621.548; ISBN-90-370-00371-1;
ETN-90-97753) Copyright Avail; NTIS HC/MF A06 A model to study the dynamic
behavior of flexible wind turbines was developed. The different subsystems of
the wind turbine are individually modeled with about the same degree of accuracy.
The aerodynamic part describes wind shear, gravity effects, unsteady effects,
and dynamic inflow. The rotor blades are provided with degrees of freedom in
lag and flap directions. The tower construction is modeled including the first
bending mode. The first torsional mode of the transmission is included in the
model. The model of synchronous generator with do link consists of a nonlinear
fourth order model, including saturation effects. The different models of the
subsystems are coupled into one integrated dynamic model which is implemented
as simulation code in the DUWECS (Delf University Wind Energy Converter
Simulation Package) program. The DUWECS program is developed in such a manner
that it is an easy to handle tool for the study of the dynamic features of wind
turbine systems. ESA N91-12153% Champaign, IL. PERFORMANCE OF AN ICE-IN-TANK
DIURNAL ICE STORAGE COOLING SYSTEM AT FORT STEWART, GEORGIA Chang W. Sohn,
Gerald Cler, and Robert J. Kedl Jun. 1990 39 p Sponsored by Army Engineering
and Housing Support Center, Fort Belvoir, VA (AD-A224739; CERL-TR-E-90/10)
Avail; NTIS HC/MF AO3 CSCL 10/4 Diurnal cold storage cooling systems provide an
effective means for reducing peak electrical demand at Army installations. The
U.S. Army Construction Engineering Research Laboratory demonstrated an
ice-in-tank diurnal ice storage (DIS) cooling system at the Post Exchange
building, Fort Stewart, GA in April 1987 as part of the Facility Engineering
Applications Program (FEAP). Design and construction of the system were
documented elsewhere.
The system was instrumented during the 1987 cooling
season to test its performance. The system energy performance, peak shaving
capability, operation and maintenance experience is documented along with and
lessons learned from the Fort Stewart first year system operation. The efficacy
of a DIS cooling system as a means of reducing peak electrical demand has been
verified; however, generalization of performance for generic ice-in-tank
systems is not recommended due to the limited amount of data available from
only one system. GRA Army Construction Engineering Research Lab., N91-121.54%
Los Alamos National Lab., NM. Advanced Engineering Technology Div. ADVANCED
SYSTEM ANALYSIS FOR INDIRECT METHANOL FUEL CELL POWER PLANTS FOR TRANSPORTATION
APPLICATIONS Nicholas E. Vanderborgh, Robert D. McFarland, and James R. Huff
1990 9 p Presented at the 1990 Fuel Cell Seminar, Phoenix, AZ, 25-28 Nov. 1990
(Contract W-7405-eng-36) (DE91-000171; LA-UR-90–3356; CONF-901106-1) Avail;
NTIS HC/MF AO2 The indirect methanol cell fuel concept actively pursued by the
USDOE and General Motors Corporation proposes the development of an
electrochemical engine (e.c.e.), an electrical generator capable for usually
efficient and clean power production from methanol fuel for the transportation
sector. This on-board generator works in consort with batteries to provide
electrical power to drive propulsion motors for a range of electric vehicles.
Success in this technology could do much to improve impacted environmental
areas and to convert part of the transportation fleet to natural gas and coal
derived methanol as the fuel source. These developments parallel work in Europe
and Japan where various fuel cell powered vehicles, often fueled with tanked or
hydride hydrogen, are under active development. Transportation applications
present design challenges that are distinctly different from utility
requirements, the thrust of most of previous fuel cell programs. In both cases,
high conversion efficiency (fuel to electricity) is essential. However,
transportation requirements dictate as well designs for high power densities,
rapid transients including short times for system start up, and consumer
safety.
The e.c.e. system is formed from four interacting components: (1) the
fuel processor; (2) the fuel cell stack; (3) the air compression and
decompression device; and (4) the condensing cross flow heat exchange device.
DOE N91-12155# Naval Postgraduate School, Monterey, CA. POWER RECOVERY OF
RADIATION-DAMAGED GALLIUM ARSENIDE AND INDIUM PHOSPHIDE SOLAR CELLS M.S. Thesis
Corinne Cypranowski Dec. 1989 155 p (AD-A225307) Avail; NTIS HC/MF A08 CSCL
10/2 Radiation damaging to on-orbit solar arrays was found to significantly
decrease power output and efficiency. By a process of annealing, these cells
can recover some of the initial performance parameters. Gallium Arsenide (GaAs)
and Indium Phosphide (InP) solar cells were subjected to 1 MeV electron
radiation by a Dynamitron linear accelerator at two fluence levels of 1E14 and
1E15 electrons/sq cm. The annealing process was varied by temperature, amount
of forward biased current, light conditions and time. Both types of cells were
found to be hardened to radiation; however, the InP cells were superior over
the two. Multiple cycles of irradiating and annealing were performed to observe
the amount of degradation and recovery. The results prove that substantial
recovery will occur, particularly with the InP cells. Applying this process to
on-orbit spacecraft utilizing solar arrays as the main source of power will
significantly increase mission life and potentially decrease cost of the
on-board power system. GRA
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