28 Matching Results

Search Results

Advanced search parameters have been applied.

Nodal Analysis of Stirling Cycle Devices

Description: This paper describes a general-purpose program for the nodal analysis of Stirling-cycle devices or other cyclic regenerative machines, and presents an extensive discussion of results for an illustrative problem. The program employs finite-difference, explicit-forward solutions, and is readily adaptable to various machine topologies. The machine is divided into specifiable numbers of fluid and solid nodes. The program solves the gas-dynamic differential equations (mass, momentum and energy balances) for each fluid node and an energy balance for each solid node. Interactions between these are represented by heat transfer and fluid friction terms. The kinetic energy of the fluid and the inertial resistance to flow acceleration are accounted for. Leakages through seals and ports are included in the analysis. Special schemes for enhanced mathematical stability and for accelerated convergence to a steady-state cycle are employed. The program is applicable to both disciplined-piston and free-piston engines. It can automatically generate very detailed outputs, both tabular and graphic (Eulerian, LaGrangian, and 3-dimensional) to help provide insight and understanding. Extensive illustrations and discussions are presented. There are two copies in the file and an extra copy in the ESD files.
Date: January 1, 1978
Creator: Schock, Alfred
Partner: UNT Libraries Government Documents Department

Stirling Engine Nodal Analysis Program

Description: A general-purpose program for the nodal analysis of Stirling-cycle devices or other cyclic, regenerative machines is described. It employs finite-difference, explicit-forward solutions, and is readily adaptable to various machine topologies. The machine is divided into specifiable numbers of fluid and solid nodes. The program solves three coupled gas-dynamic differential equations (mass, momentum, and energy balances) for each fluid node, and an energy balance for each solid nod. Interactions between these are represented by heat transfer and fluid friction terms. The kinetic energy of the fluid and the inertial resistance to flow acceleration are accounted for. Leakages through seals and ports are included in the analysis. Special schemes for enhanced mathematical stability and for accelerated convergence to a steady-state cycle are described. The program is applicable to both disciplined-piston and free-piston engines. It can automatically generate very detailed outputs, both tabular and graphic (Eulerian, LaGrangian, and 3-dimensional) to help provide insight and understanding. Extensive illustrations and discussions are presented.
Date: January 1, 1978
Creator: Schock, Alfred
Partner: UNT Libraries Government Documents Department

A Thermally-Integrated Spacecraft Design Approach Using Nuclear Dynamic Power Systems

Description: The use of dynamic-cycle heat engines for space electric power systems makes it possible to design a spacecraft which is thermally integrated with the power system. The power system fluid loop is used to cool the spacecraft equipment and structure. This results in a spacecraft which is extremely insensitive to changes in sun-angle, eclipse periods, or power dissipation. Resultant temperature variations of equipment is seen to be a few degrees in the worst-case orbits, without the need for active thermal control. Organic Rankine and Brayton cycle generators are considered. Cycle power losses of less than one-percent are experienced in implementing this concept.
Date: January 1, 1978
Creator: Raab, Bernard
Partner: UNT Libraries Government Documents Department

DOE/JPL advanced thermionic technology program. Progress report No. 34, June-July 1978. Report No. TE4237/4247-19-79

Description: The work function of L605, the optimized converter (L605 emitter, nickel collector) performance at various spacings and fixed emitter temperatures, I-V characteristics a sprayed BaO thermionic converter, and characteristics of combustion-heated thermionic devices are presented graphically. Spacing experiments, a particle thermionic converter, and alloy hot shell development are described. A high efficiency conversion experiment using a structured molybdenum-rhenium emitter and nickel collector is discussed. An extensive study of the high temperaure bonding of lanthanum hexaboride is described. (WHK)
Date: January 1, 1978
Partner: UNT Libraries Government Documents Department

DOE/JPL advanced thermionic technology program. Progress report No. 36, October-November 1978. Report No. TE4258/4247-89-79

Description: Progress is reported on DOE tasks including: (1) thermionic converter plasma studies; (2) low temperature converter development; (3) component hardware development; and (4) combustion heated thermionic device. JPL tasks described include: (1) basic surface experiments; (2) triode converter experiments; (3) design of a cylindrical converter; and (4) high efficiency conversion experiments. (WHK)
Date: January 1, 1978
Partner: UNT Libraries Government Documents Department

Brayton isotope power system. Volume II. System evaluation attributes

Description: This volume of the Brayton Isotope Power System, Phase II Plan, contains the self-evaluation by AiResearch, GE, and TECO, addressing Section 3 of The Dynamic Systems Evaluation Criteria and Procedures established by the Department of Energy. These evaluation criteria addresses: Component Feasibility; Flight System Design Performance; GDS Test Results; Reliability and Practicality; Safety; Spacecraft Integration; and Cost and Risk. Included in each of these general categories are several attributes, each of which addresses a separate component, feature, or area of interest related to the power system, its development status, degree of preparedness for proceeding into a flight program, and/or the contractors' performance during Phase I. The key elements which indicate the readiness of a radioisotope power system to progress into a flight qualification program are: an advanced state of development of the power conversion system; demonstrated or exhibited potential for space systems standards of reliability; evident capability of meeting system safety requirements; favorable cost/benefit tradeoff considering projected missions and technology advancement potential; and proven feasibility of fabricating and qualifying a flight system and integrating it with a candidate spacecraft and launch vehicle. As a result of considerable government investment in Brayton system component development, the MHW isotope heat source and the BIPS Phase I Ground Demonstration System, the BIPS is a more advanced state of development than any previous radioisotope power system technology. Evidence of this is presented along with a complete review of the attributes, the contractor recommended ratings, and the rationale for the self-evaluation.
Date: March 15, 1978
Partner: UNT Libraries Government Documents Department

Quality assurance program plan applicable to the KIPS technology verification phase

Description: This Quality Program Plan describes the manner in which the Energy Systems Unit of the Advanced Technology Group Division of Sunstrand Corporation applies its Quality Assurance Program and Systems to control and assure commpliance to the Quality requirements in accordance with NRA-1, dated July 1, 1977, in support of the Kilowatt Isotope Power Systems (KIPS) Program Technology Verification Phase.
Date: October 4, 1978
Partner: UNT Libraries Government Documents Department

Heat source component development program, October 1977--February 1978

Description: The General Purpose Heat Source (GPHS) is being developed by Los Alamos Scientific Laboratory (LASL) for the Department of Energy (DOE) Division of Nuclear Research and Application (DNRA). The first mission scheduled for the GPHS is the NASA Out-of-Ecliptic Flight in January, 1983. During the current reporting period (October--December, 1977, January--February, 1978), activities in this task were conducted as follows: (1) documentation of results of the reentry thermal, ablation, and thermal stress analyses of the conceptual designs; (2) identification and completion of modifications to the thermal and ablation models used to determine the performance response of the heat source modules during reentry; (3) initiation of modifications to the thermal stress model used to determine the performance response of heat source modules during reentry; (4) completion and documentation of the surface chemistry experiments; (5) initiation and completion of activities in support of LASL to define test plans for the trial design phase of the GPHS development program; (6) participation in the GPHS design review meeting held at DOE/Germantown, Maryland, December 19--20, 1977; and (7) initiation of the thermal analysis of Trial Design 1.1.
Date: March 1, 1978
Partner: UNT Libraries Government Documents Department

Kilowatt isotope power system. Phase II plan. Volume V. Safety, quality assurance and reliability

Description: The development of a Kilowatt Isotope Power System (KIPS) was begun in 1975 for the purpose of satisfying the power requirements of satellites in the 1980's. The KIPS is a /sup 238/PuO/sub 2/-fueled organic Rankine cycle turbine power system to provide a design output of 500 to 2000 W. Included in this volume are: launch and flight safety considerations; quality assurance techniques and procedures to be followed through system fabrication, assembly and inspection; and the reliability program made up of reliability prediction analysis, failure mode analysis and criticality analysis. (LCL)
Date: March 15, 1978
Partner: UNT Libraries Government Documents Department

Kilowatt Isotope Power System: component test procedure for the ground demonstration system jet condenser focusing. 77-KIPS-59. Revision A

Description: This test procedure (No. 404A) provides a detailed description of the verification methods which shall be used in the development program to be conducted on the Kilowatt Isotope Power System (KIPS) Jet Condenser to fulfill the requirements of the Ground Demonstration Test Plan, Section 6.4. This is a revision of Test Procedure No. 404.
Date: March 14, 1978
Partner: UNT Libraries Government Documents Department

Kilowatt isotope power system. Phase II plan. Volume I. Phase II program plan

Description: The development of a Kilowatt Isotope Power System (KIPS) was begun in 1975 for the purpose of satisfying the power requirements of satellites in the 1980's. The KIPS is a /sup 238/PuO/sub 2/-fueled organic Rankine cycle turbine power system to provide a design output of 500 to 2000 W. Phase II of the overall 3-phase KIPS program is described. This volume presents a program plan for qualifying the organic Rankine power system for flight test in 1982. The program plan calls for the design and fabrication of the proposed flight power system; conducting a development and a qualification program including both environmental and endurance testing, using an electrical and a radioisotope heat source; planning for flight test and spacecraft integration; and continuing ground demonstration system testing to act as a flight system breadboard and to accumulate life data. (LCL)
Date: March 15, 1978
Partner: UNT Libraries Government Documents Department

Electron reflection from one-dimensional potential barriers

Description: This report summarizes the relevant experimental evidence for electron reflectivity effects in TEC and describes the analytical effort to better understand electron reflectivity as a function of the potential configuration of the surface layer. The analyses consider rectangular and triangular barrier models with, and without, image potentials. The calculated results are presented and discussed. Details of the solutions are given in Appendices A, B, and C. The computer programs to obtain these results are listed in Appendix D. These analyses demonstrate that cesium-oxygen composites with potential discontinuities around one volt and 20 A thick can be expected to be highly reflective to thermal electrons. Consequently, such composites would be expected to have significant effects on TEC performance.
Date: September 1, 1978
Creator: Balestra, C.L.; Huffman, F.N. & Yang, C.C.
Partner: UNT Libraries Government Documents Department

Economic feasibility of strontium-90 fueled heaters for use in cold regions

Description: This study was conducted to conceptually design and obtain cost estimates for various radioisotope fueled heating systems for use in potential cold regions applications, and to determine the economic feasibility of radioisotope fueled heaters by comparing them to fuel oil systems. The applications have been identified and grouped, according to thermal output: (1) 1 kWt septic tank heaters, well-head heaters, heaters to assist operation of sewage lagoons, and (2) 7 or 12 kWt potable water system heaters. Potentially economic locations for these heaters are in remote Alaskan communities of 50 to 200 residents, where fuel oil prices and reliability requirements are high. Two basic conceptual heat designs were considered: a heat source and radiation shielding with no external heat transfer equipment, and a heat source and radiation shielding with external heat transfer equipment. Costs for both conceptual designs were estimated for heater sizes of 1 kWt, 7 kWt, and 12 kWt. The major costs were for the heat source and equipment. Radioisotope heaters were found to be much more expensive than fuel oil systems. The radioisotope fuel costs contribute 50 percent or more to the overall cost. Thus, an effective method to make a substantial reduction in radioisotope system cost would be to lower the Sr price from 10 cents/curie. It was concluded that radioisotope heaters will not be economically competitive with fuel oil systems unless one or more of the following situations occur: the price of strontium-90 is reduced below 10 cents/curie; fuel oil prices increase significantly; or for a particular application, the reliability or adaptability of a fuel oil system is unacceptable and a radioisotope system is satisfactory.
Date: February 1, 1978
Creator: Sande, W.E. & Aaberg, R.L.
Partner: UNT Libraries Government Documents Department

Pilot plant verification of operating conditions for the Rover Secondary Burner

Description: Pilot plant verification of operating conditions for the fluidized bed combustion of graphite in the Rover Fuels Processing Facility Secondary Burner is described. Operating temperature, filter blowback frequency, fluidizing gas composition, ash elutriation time, and U/sub 3/O/sub 8/ to Al/sub 2/O/sub 3/ ratio in the burner bed were studied. A startup procedure and a graphite burnout procedure for initial checkout of the Rover Secondary Burner are recommended.
Date: March 1, 1978
Creator: Westra, A.G.
Partner: UNT Libraries Government Documents Department

Kilowatt Isotope Power System: test report for the radiator long and short panels. 77-KIPS-112

Description: The test procedure and results of testing conducted on the Kilowatt Isotope Power System (KIPS) Radiator Panels by Teledyne Energy Systems are presented. The results of the thermal vacuum, heat rejection capability, temperature profile and pressure drop characteristics testing are presented. These results show that the radiator panels can satisfy the test requirements of Teledyne Energy Systems Test Procedure number KIPS 1010300.
Date: February 1, 1978
Creator: Brainard, E.L.
Partner: UNT Libraries Government Documents Department

Kilowatt Isotope Power System: component report for the Ground Demonstration System Accumulator

Description: The Model Number ORC1A3A01 System Accumulator for the Kilowatt Isotope Power System was expulsion tested and demonstrated to be in compliance with the requirements of Sundstrand Explusion Test Procedure, TP 400. Test requirements of TP 400 were extracted from the Kilowatt Isotope Power System, Ground Demonstration System Test Plan.
Date: January 31, 1978
Creator: Brainard, E.L.
Partner: UNT Libraries Government Documents Department

Kilowatt Isotope Power System: component test report for the electric heat source assembly. 77-KIPS-108

Description: The purpose of the acceptance testing was to demonstrate that the electrical heat source assembly (EHSA) has completed sufficient testing to satisfy the requirements set forth within the Kilowatt Isotope Power System (KIPS) Component Test Procedure (No. KIPS1020304) for the electrical heat source assembly. The results of the acceptance testing/analysis on the EHSA are presented.
Date: February 2, 1978
Creator: Brainard, E.L.
Partner: UNT Libraries Government Documents Department

Kilowatt Isotope Power System: component test report for the Ground Demonstration System Alternator Stator

Description: Results are presented of acceptance tests conducted on the Alternator Stator, S/N 002, for the Kilowatt Isotope Power System. These results show that the Alternator Stator, S/N 002 for the Kilowatt Isotope Power System has satisfactorily completed the testing set forth within Sundstrand Test Specification 2538. Test requirements of TS 2538 were extracted from the Kilowatt Isotope Power System, and Phase I Test Plan.
Date: April 25, 1978
Creator: Brainard, E.L.
Partner: UNT Libraries Government Documents Department