| Natural Gas Liquefier for Vehicle Fuel |
MAR 95 |
86 pages |
| Authors:
E. C. Owens; K. R. Kohuth; SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH F ACILITY
|
 | This project was a continuation and refinement of a feasibility prototype natural gas liquefier that had been designed, fabricated, and tested under a U.S. Department of Energy (DoE) Small Business Innovation Research (SBIR) contract. Extensive performance testing was conducted to characterize the natural gas liquefier refrigeration capability and to collect data for diagnostic purposes. Analysis of the effectiveness of the regenerator concluded that the current design would require substantial empirical ... |
|
| Chemical Preservation of Volatile Organic Compounds in Soil Subsamples |
FEB 95 |
13 pages |
| Authors:
Alan D. Hewitt; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| This study evaluated chemical preservation as a means of inhibiting the biological degradation of volatile organic compounds (VOCs) in soil subsamples held for 14 days or longer. Experiments were performed using a soil in which benzene and toluene were found to rapidly biodegrade under aerobic conditions while following protocols consistent with high-level (VOCs at >1 micrograms/g) and low-level (VOCs at <1 micrograms/g) purge-and-trap gas chromatography mass spectrometry and static headspace ... |
|
| Pentagon New Heating and Refrigeration Plant Staffing and Training Plan |
JAN 95 |
|
| Authors:
John Cable; Marguerite Moss; LOGISTICS MANAGEMENT INST MCLEAN VA
|
 | The New Heating and Refrigeration Plant (NHRP) for the Pentagon is expected to be operational in the first quarter of FY96 and replaces the original plant built in 1943. The NHRP utilizes advanced technology including digital control systems. This report identifies the specific staffmg and tralning requirements for operation and maintenance of the new plant as well as identifies transitional issues to be planned for in moving from the operation ... |
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| Construction and Performance Measurement of a Portable Thermoacoustic Refrigerator Demonstration Apparatus |
DEC 94 |
96 pages |
| Authors:
Todd J. Berhow; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis documents the construction and performance measurement of a portable thermoacoustic refrigerator demonstration apparatus. The objective of the portable refrigerator is to graphically display, as a demonstration during lectures, a substantial thermoacoustic cooling power. Within minutes of start up, the apparatus develops frost on a small metal portion of the device. The refrigerator is small and compact and fits into a portable carrying case along with all ancillary equipment. ... |
|
| Use of Chlorofluorocarbon-Based Refrigerants in U.S. Army Facility Air- Conditioning and Refrigeration Systems: Recommendations for the Interim Period 1994-2000 |
NOV 94 |
26 pages |
| Authors:
Chang W. Sohn; Kelly O. Homan; Nancy Herring; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL ENERGY AND UTILITI ES SYSTEMS DIV
|
| Production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) has been scheduled for phaseout because of the contribution of these chemicals to the depletion of the stratospheric ozone layer. CFC production is scheduled for phaseout by I January 1996; HCFC production will halt by the year 2020. The next generation of refrigerants is expected to be tested and widely available by the turn of the century. As a large-scale end user of ... |
|
| Thermo-Fluid Mechanic Study of Thermoacoustic Devices |
27 JUN 94 |
39 pages |
| Authors:
A. Prosperetti; C. Herman; O. Knio; JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICAL ENGINEERING
|
| The work summarized is divided into three parts. In Part I the development of a simplified model of thermo-acoustic devices is described and the results of its preliminary analysis documented. In Part II the results so far obtained in an experimental program designed for the visualization of flow and heat transfer in a thermoacoustic stack are described. Part III deals with the progress on a full Navier-Stokes numerical simulation of ... |
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| Anisotropic Heat Exchangers/Stack Configurations for Thermoacoustic Heat Engines |
21 JUN 94 |
8 pages |
| Authors:
Julian D. Maynard; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF PHYSICS
|
| The goal of this project is to explore novel configurations of heat exchangers and the stack (heat pumping) section of thermoacoustic heat engines. The approach will be to use anisotropic systems, such as made possible by glass capillary array technology. A part of the project will involve the development of high power drives and acoustic resonators for testing the new systems. Acoustics, Thermodynamics, Heat Engine, Refrigerator |
|
| High Frequency Thermoacoustic Refrigerator |
16 JUN 94 |
14 pages |
| Authors:
Orest G. Symko; UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS
|
| A small thermoacoustic refrigerator was developed for operation at 5 kHz. Its main components are a piezoelectric driver of the bimorph type, a cotton wool stack, a 1/2-wave resonator (operated at its 3rd harmonic), and photolithographically processed copper heat exchangers. Tests with air at 1 atmosphere as the working gas produced a temperature difference Delta T across the stack of 32 deg C in 4 seconds for an acoustic power ... |
|
| Liquid Pressure Amplification and Liquid Injection in Air Conditioning and Refrigeration Systems |
JUN 94 |
5 pages |
| Authors:
Bradley Yee; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
| Liquid pressure amplification and liquid injection are two patented methods of decreasing compressor energy consumption and increasing condenser capacity in an existing reciprocating vapor compression refrigeration system. Although this 6-year-old technology has been installed on thousands of existing systems, it continues to generate controversy in engineering and utility circles. |
|
| Low Cost, High Efficiency Regenerator for Cryocoolers |
MAR 1994 |
35 pages |
| Authors:
Ran Yaron; YARON CONSULTING PALO ALTO CA
|
| A new regenerator for cryocoolers has been invented. Phase I has demonstrated that the regenerator can be fabricated as conceived. The new regenerator should improve performance of the "Brilliant Eyes" cryocoolers by more than 20 percent without modifications. New cryocoolers designed from scratch to utilize the new technology have the potential to double current cryocooler performance, dramatically improving the ratio of heat transfer to pressure drop, through regenerator. This results ... |
|
| Advanced Regenerators for Very Low Temperature Cryocoolers |
FEB 1994 |
117 pages |
| Authors:
Woody Ellison; GENERAL PNEUMATICS CORP SCOTTSDALE AZ WESTERN RESEARCH CENTER
|
| This SBlR project is Phase I in the development of a new form of high effectiveness regenerators which are critically needed to develop efficient, long-life cryocoolers for producing temperatures to below 10 K. Regenerator ineffectiveness can overwhelmingly increase required drive power and impose limits on highest operating speed and lowest refrigeration temperature. Due to the fundamental nature of mafter and heat, current regenerators do not allow cryocoolers to operate new ... |
|
| Two Stage Sibling Cycle Compressor/Expander |
FEB 1994 |
66 pages |
| Authors:
Matthew P. Mitchell; MITCHELL STIRLING MACHINES SYSTEMS INC BERKELEY CA
|
| A two stage Sibling Cycle refrigerator was investigated. A single stage refrigerator existed, and two models were used to design a second stage. The second stage was added to the existing cooler and tested (different combinations of port timing, pressure, and operating speed were considered). The test results were compared to models. Following testing, an investigation was conducted to try to explain differences between the analytical and experimental results. Finally, ... |
|
| Annual Summary of Basic Research Thermoacoustic Heat Transport: 1993 |
NOV 93 |
26 pages |
| Authors:
Anthony A. Atchley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| This annual report details progress in basic research in thermoacoustic heat transport made during the period October 1, 1992 through September 30, 1993. Our major research efforts in FY 1993 were concentrated in five areas: (1) an analysis of the initial buildup of oscillations in thermoacoustic prime movers; (2) an investigation of stability curves for a thermoacoustic prime mover, (3) initial measurements of the velocity field in thermoacoustic engines using ... |
|
| Studies of Momentum and Energy Transfer Across Wavy Gas-Liquid Interfaces |
01 JUN 93 |
67 pages |
| Authors:
A. E. Dukler; HOUSTON UNIV TX DEPT OF CHEMICAL ENGINEERING
|
| Two phase gas-liquid flow and its associated interfaces exist in a wide variety of situations of importance to the Navy and this has prompted the study of the basic flow mechanics which underlie this complex process. The existence of wind-wave interactions over large bodies of water have long been recognized as a special case of two phase flow where the presence of the deformable interface plays a complex role in ... |
|
| Development of Passive Superconducting Bearings. Phase 3 |
14 MAY 93 |
|
| Authors:
Dantam K. Rao; MECHANICAL TECHNOLOGY INC LATHAM NY
|
| This report documents the work performed by MTI under contract to Strategic Defense Initiative Organization to develop the technology of Superconducting Bearings. This work, had been supported by NASA and DARPA in addition to SDIO. As a result of this work, MTI had developed a passive superconducting bearing that is used to levitate relatively heavy rotors. It used this bearing to levitate a 7 lb rotor and spin at speeds ... |
|
| Improved Magnetic Refrigerators with Hi-Tc Superconducting Magnets |
APR 1993 |
46 pages |
| Authors:
Charles Gallo; SUPERCONIX INC ST PAUL MN
|
| To produce pre-formed thick film Hi-T sub c superconducting magnets with improved critical current for magnetic refrigerators, the Hi-T sub c superconducting powder was coated with a thin film of beneficial metal(s) (Ag, Pb, Nb) before fabrication. It was anticipated that the metallic bonding between the Hi-T sub c superconducting grains would overcome the usual 'weak-links' that limit the superconducting current. This might be particularly effective with Lead and Niobium ... |
|
| Hybrid Oxygen System |
OCT 1992 |
199 pages |
| Authors:
W. D. Lee; LITTLE (ARTHUR D) INC CAMBRIDGE MA
|
| Investigation of concepts for generating oxygen on-board combat aircraft and development of a bleed air-driven refrigeration, liquefaction, and cryogenic storage system for oxygen were undertaken in this study. A number of alternative approaches were examined while considering size, weight and power consumption. An open-loop bleed air-driven system was selected for design, development, and testing. The bleed air-driven refrigeration unit achieved oxygen liquefaction temperatures of 90 deg K and liquefied and ... |
|
| A Model Action Pla to Reduce the Use and Release of CFCs in Air- Conditioning and Refrigeration Systems |
SEP 92 |
91 pages |
| Authors:
David W. Andrews; Daniel P. Ellert-Beck; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This study investigated methods to reduce the use and release of chlorofluorocarbon (CFC) refrigerants and evaluated alternatives to CFCS in air- conditioning and refrigeration systems. A life cycle cost (LCC) analysis formed the basis for evaluation. A literature review examined applicable CFC directives, containment methods, replacement refrigerants, and alternative processes. The results of the LCC analysis showed that maintaining the existing CFC system was always the least costly alternative. When ... |
|
| Theoretical and Experimental Study of Thermoacoustic Engines |
31 DEC 1991 |
66 pages |
| Authors:
Richard Rapset; Henry E. Bass; W. P. Arnott; MISSISSIPPI UNIV UNIVERSITY PHYSICAL ACOUSTICS RESEARCH LAB
|
| Thermoacoustic engines can be used to pump heat using a sound wave (refrigerator or heat pump) or pump a sound wave using a temperature gradient (prime mover). The basic arrangement is a gas-filled acoustic resonator with appropriately positioned thermoacoustic elements. Two types of thermoacoustic elements are used in these engines. The first type are heat exchanges which are used to communicate heat between the gas and external heat reservoirs. The ... |
|
| Nucleate Pool Boiling of R-114 and R-114/Oil Mixtures from Single Enhanced Tubes |
SEP 91 |
228 pages |
| Authors:
Dean C. Sugiyama; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Nucleate pool boiling heat transfer is an integral part of any vapor- compression refrigeration cycle. With a view to improving overall cycle efficiency, the heat transfer performance in the evaporator can be improved by using enhanced boiling surfaces. This thesis looks at the pool boiling characteristics of R-114 (presently used in large shipboard AC systems) from 10 enhanced single copper tubes and compares performance with a smooth copper tube. Since ... |
|
| Development of a Low Noise 10 KJ-T Refrigeration System |
05 JAN 91 |
5 pages |
| Authors:
Robert L. Paugh; MMR TECHNOLOGIES INC MOUNTAIN VIEW CA
|
| Work has continued on the evaluation of the pneumatic compressor system which will be used to demonstrate (1) operating lifetime of the refrigerator gas compressor under development and (2) compressor-refrigerator system performance. Work to improve the cooling capacity of the refrigerator at 20k by using more efficient heat exchanger designs has continued. While operation down to 20k has been achieved and reliably reproduced the investigation of the use of thinner ... |
|
| Development of a Low Noise 10K J-T Refrigeration System |
15 OCT 90 |
5 pages |
| Authors:
William A. Little; MMR TECHNOLOGIES INC MOUNTAIN VIEW CA
|
| This report summarizes work done on the development of a low noise, Joule-Thomson, microminiature refrigeration system. Progress has been made on the development of the pneumatic compressor drive system which will be used to operate the compressor to determine the compressor lifetime and refrigerator system performance. Work on the refrigerator itself also has progressed well with operation down to 20K now being achieved, and reliably reproduced. Work is underway on ... |
|
| The Extension of 4 C Storage Time of Frozen-Thawed Red Blood Cells |
11 OCT 90 |
|
| Authors:
Byron A. Myhre; Carol S. Marcus; HARBOR-UCLA MEDICAL CENTER TORRANCE CA RESEARCH AND EDUCATION INST
|
| The process of freezing and storing red blood cells has been developed into a relatively simple and practical technic. The storage of frozen red blood cells has been approved by the FDA for up to 10 years of storage time. However once the blood is thawed and reconstituted, the red cells can be stored in a normal blood bank refrigerator for a period of only 72 hrs after which they ... |
|
| Applications of Superconductivity to Avionics: Proceedings of a Conference Held in Bath, England on May 7-8, 1990 (Les Applications de la Supraconductivite dans le Domains de l'Avionique) |
OCT 90 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| Recent advances in developing high temperature superconductors have renewed interest in the entire superconductivity field. Modern techniques in materials preparation are making it possible to fabricate a number of new superconducting components which promise significant improvements in the performance of avionics systems. The almost daily revelation of advances in this area attests to its importance as an emerging technology. This Specialists' Meeting brought together device scientists and avionics engineers to ... |
|
| Measurement of the Space Thermoacoustic Refrigerator Performance |
SEP 90 |
241 pages |
| Authors:
Jay A. Adeff; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This is the fifth thesis of the Space Thermoacoustic Refrigerator (STAR) project which will be launched aboard the Space Shuttle in 1991 to demonstrate the potential of this technology for cooling satellite electronics and sensors. It describes the design, construction, and testing of the resonator portion of the refrigerator along with its integration with the existing driver and control electronics which were the subject of four previous theses. This resonator ... |
|
| Quarterly Report for Contract N00014-88-C-0755 (California University) |
28 MAR 90 |
6 pages |
| Authors:
CALIFORNIA UNIV LOS ANGELES
|
| The purpose of this study was to find out if blood that had been frozen and thawed could be stored in a refrigerator for periods longer than 72 hours without excessive hemolysis, and if transfused, would have an acceptable in-vivo survival. Currently we have drawn 75 donors and have studied 36 of these with in-vitro analysis. In this quarter, 11 units have been studied in which the entire unit was ... |
|
| Thermodynamic Properties of Refrigerant Mixtures |
31 JAN 90 |
157 pages |
| Authors:
Lawrence R. Grzyll; John J. Silvestri; MAINSTREAM ENGINEERING CORP ROCKLEDGE FL THERMAL SYSTEMS DIV
|
| The objective of this project was to analyze the impact of refrigerant mixtures on refrigeration system capacity and components. A heat pump computer simulator was developed to predict the change in system capacity of two baseline air-conditioning systems as a function of refrigerant mixture concentration. Refrigerant mixtures made of refrigerants normally stocked on Air Force bases were considered. |
|
| Quarterly Report for Contract N00014-88-C-0755 (California University) |
23 JAN 90 |
5 pages |
| Authors:
CALIFORNIA UNIV LOS ANGELES
|
| The purpose of this study was to find out if blood that had been thawed could be stored in a refrigerator for periods longer than 72 hours without excessive hemolysis. Keywords: Blood storage. (emk) |
|
| The Measurements of Thermoacoustic Phenomena Using Thermoacoustic Couples |
JUN 89 |
68 pages |
| Authors:
Chia-Ning Ao; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Thermoacoustic heat transport and its applications, such as thermoacoustic engines and refrigerators, have been discussed in a number of articles over the past several years. However, lacking from these articles is a thorough, quantitative experimental investigation of the basic theory underlying thermoacoustic heat transport. Such an investigation is the purpose of this thesis. A logical starting point for such a study is to investigate the simplest class of thermoacoustic engine ... |
|
| Container System Hardware Status Report |
89 |
141 pages |
| Authors:
ARMY BELVOIR RESEARCH DEVELOPMENT AND ENGINEERING CENTER FORT BELVOIR VA
|
| Today virtually all of the products and equipment shipped overseas as well as by rail are shipped using some form of shipping container. The Merchant Marine industry has made the transition from the breakbulk fleet of the past to the current containership fleet which has made the Department of Defense (DOD) examine the ways developed forces are supported in contingency situations. This publication was initiated in 1977 by the former ... |
|
| An Experimental Investigation of the Thermal Conductivity of Porous Adsorbents |
89 |
64 pages |
| Authors:
Joseph J. Secary; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The thermal conductivities of Praseodymium-Cerium-Oxide (PCO) and Saran Carbon have been experimentally investigated using a steady-state heat transfer technique. The investigated substances are used as adsorbents in adsorption compressors being developed for spaceborne refrigeration applications. The objectives of the investigation were to determine the thermal conductivities and establish their temperature dependency. Data were collected for the PCO over a temperature range of 300 C to 600 C, and O (zero) ... |
|
| Physics and Technology for the In-Situ Investigation of Properties of Materials |
12 MAY 1988 |
9 pages |
| Authors:
J. M. Parpia; R. C. Richardson; CORNELL UNIV ITHACA NY LAB OF ATOMIC AND SOLID STATE PHYSICS
|
| The progress report is broken up into four sections, the first detailing the apparatus constructed, the second, results on CoSi2, and third, very recent results on free standing Aluminium films and wires. In addition, results on Arsenic doped Silicon are proceeding and are described briefly. Samples can be inserted into our Oxford 200 top loading dilution refrigerator cryostat which has been modified to include a 7T magnet mounted on the ... |
|
| Guide to the Salvage of Temperature-Abused Food Products in Military Commissaries |
APR 88 |
44 pages |
| Authors:
R. V. Lachica; G. J. Silverman; R. Sharp; ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
|
| A guide is proposed that would allows health personnel at military commissaries to select those foods that are salvageable from those that have to be rejected because of risk of foodborne illness as a consequence of refrigeration failure. The guide consists of three components. The first is the classification of the various chilled and frozen foods into three categories: 'MELT', 'SAFE', and 'RISK'. The second is the concept of temperature ... |
|
| Methods and Instrumentation for Biomagnetism |
28 FEB 88 |
|
| Authors:
Lloyd Kaufman; Samuel J. Williamson; S. E. Robinson; NEW YORK UNIV N Y
|
| Capabilities for biomagnetic measurements have been advanced by the successful development of a Superconducting Quantum Interference Device(SQUID)- based magnetic sensor that does not rely on liquid helium for cooling. This system, known as CryoSQUID, achieves a sensor noise level that is appropriate for high-sensitivity measurements of the magnetic field of the human brain. It employs an external compressor and a two-stage refrigerator within the sensor's dewar to cool a dc-SQUID ... |
|
| Proceedings of the Symposium on Low Temperature Electronics and High Temperature Superconductors Held in Honolulu, Hawaii on 19-23 October 1987. Volume 88-9 |
88 |
|
| Authors:
Stanley I. Raider; Randall Kirschman; Hisao Hayakawa; Hiroshi Ohta; ELECTROCHEMICAL SOCIETY INC PENNINGTON NJ
|
| The included papers demonstrate that the study and use of low temperature electronics are increasing in many diverse areas, providing valuable benefits for many applications, as well as opportunities for research in materials and devices. Operating electronic devices and systems at low temperatures present many challenges for the designer and user. Although there is active interest in this area, it remains to be seen whether the advantages achieved by cooling ... |
|
| Proceedings of the International Cryocoolers Conference (4th) Held in Easton, Maryland on 25-26 September 1986 |
30 OCT 87 |
367 pages |
| Authors:
Geoffrey Green; George Patton; Margaret Knox; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
|
| This document contains the proceedings of the Fourth Cryocooler Conference for electronic systems and sensors. Thirty-one papers were presented, describing advancements and applications of cryocoolers in the temperature range below 80 K. Keywords: Compressors; Superconductive coils; Reciprocating magnetic refrigerators; Magnetic refrigerators; Helium refrigerators; Liquid Helium; Recondensing refrigerators; Heat exchangers; Stirling cycle refrigerators; Gas compressors; Piston compressors; Symposia; Cryogenics; Cryopumps; Helium; Infrared detectors; Refrigeration; Superconductors. (aw) |
|
| Fibrous Glass Aerosols: A Literature Review |
02 OCT 1987 |
20 pages |
| Authors:
Bruce R. Laverty; NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
|
| The submarine atmospheric is a topic of interest, considering that once submerged, the craft relies on its own electrostatic precipitators (ESP's), scrubbers, and filters to create, ideally, an environment with minimal aerosolized toxic materials and other by-products. Historically, atmosphere sampling aboard nuclear submarines has shown contaminants. Other contaminants include: ozone, (major source: by-product of the ESP's); Freon, (major source: ship's refrigeration system and air conditioning plants); hydrogen, (major source: ship's ... |
|
| U.S. Army Biomedical Research and Development Laboratory, Annual Progress Report, Fiscal Year 1987. Volume 2 |
01 OCT 87 |
|
| Authors:
Stephen C. Hembree; ARMY BIOMEDICAL RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
|
| The Annual Progress Report, Fiscal Year 1987, summarizes in two volumes the research performed by the U.S. Army Biomedical Research and Development Laboratory in projects authorized by The Surgeon General, the Army, and the Commander, U.S. Army Medical Research and Development Command, and supported by RTDE funds from the U.S. Army Medical Research and Development Command. The research projects pertain to: Field Sanitation and Water, Conventional Weapon Systems, Smokes/Obscurants, Synthetic ... |
|
| Estimating Payload Internal Temperatures and Radiator Size for Multimegawatt Space Platforms |
AUG 1987 |
74 pages |
| Authors:
Dean Dobranich; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| A conceptual space platform consists of a payload, a power conditioning unit (PCU), and two radiators: the main radiator and a secondary radiator. A computer program was written to determine the required size of the two radiators and the temperatures of the PCU and payload for a given platform power level. An iterative approach is necessary because the required size of the main radiator depends ... |
|
| Compressor-Scavenging Eductor System. |
07 APR 1987 |
|
| Authors:
David C. Winyard; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The present invention overcomes performance losses of positive displacement compressors due to internal liquid recirculation. This is achieved by removing or scavenging liquid that leaks out of the compression pocket before it is captured by another lower-pressure compression pocket of the compressor. The scavenged liquid is collected in the bottom of the compressor pressure vessel and cooled before it is reinjected in the compressor to complete the cycle. Positive-displacement compressors ... |
|
| Experimental Investigation of a Magnetic Refrigerator Based on Magnetically Active Regeneration |
MAR 87 |
|
| Authors:
Yukikazu Iwasa; Joseph L. Smith Jr.; Carl P. Taussig; MASSACHUSETTS INST OF TECH CAMBRIDGE CRYOGENIC ENGINEERING LAB
|
| The concept of magnetically active regeneration is explored in a prototype magnetic refrigerator which has produced a refrigeration of 0.40 W at 3.79 K while rejecting 3.0 W to a 5.51 K sink. The prototype refrigerator consists of a Gadolinium-Gallium-Garnet(Gd3Ga5012)regenerator core excited by an AC superconducting solenoid. A reversing flow of 3 atm supercritical helium carries the heat of magnetization to the hot reservoir and refrigerates the cold reservoir with ... |
|
| Cold Startability of Methanol-Fueled Chevrolet S-10 Vehicles |
DEC 86 |
|
| Authors:
A. F. Montemayer; B. B. Baber; E. C. Owens; SOUTHWEST RESEARCH INST SAN ANTONIO TX BELVOIR FUELS AND LUBRICANTS RESEARCH FACILITY
|
| In this program, four Chevrolet S-10 vehicles were tested for cold starting performance. The vehicles consisted of two gasoline-fueled control vehicles and two M85-fueled test vehicles. The M85 vehicles were converted to methanol use with the Bank of America conversion technology. Two engine geometries were tested. The 2.5-liter L-4 throttle body injected engine was used in one M85 and one control vehicle. The 2-8-liter V-6 carbureted engine was used in ... |
|
| Development of a Low Noise 10K J-T Refrigeration System |
15 AUG 86 |
|
| Authors:
William A. Little; H. Edman; M. Stewart; M. Dubois; A. Nasg; MMR TECHNOLOGIES INC MOUNTAIN VIEW CA
|
| This report summarizes the work done to date, in the first 30 days on the development of a low noise, Joule-Thomson, microminiature refrigeration system designed for 10K operation. The plan of attack for the present contract has three major parts to it: first, the development of the three stage refrigerator; second, the development of a suitable compressor to provide the gases and thirdly, the development of an effective gas cleansing ... |
|
| Effect of Freezing on the Level of Contaminants in Uncontrolled Hazardous Waste Sites. Part 1. Literature Review |
JUL 86 |
|
| Authors:
I. K. Iskandar; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| This report reviews the literature concerning the effects of ground freezing on uncontrolled hazardous waste sites. Since there was very little information directly related to hazardous waste materials, previous studies on the beneficial use and impact of freezing on wastewater, sea water, sludges and soils have been included. Freezing of uncontrolled hazardous waste sites may cause frost heaving of buried waste material, allowing chemical wastes to move upward, and chemical ... |
|
| Dynamics of Gas-Surface Interactions-Instrumentation |
27 MAR 86 |
|
| Authors:
Steven J. Sibener; CHICAGO UNIV IL JAMES FRANCK INST
|
| This instrumentation grant was used to procure several pieces of equipment with significantly enhanced research capabilities for studying the interactions of molecular beams and laser radiation with well defined surfaces in an ultra-high vacuum environment. A partial listing of the topics that are being explored in greater as a direct result of the new instrumentation includes surface phonon spectroscopy, the dynamics and energetics of heterogeneous interactions, thin film growth including ... |
|
| Electron Microscopy Observation of Electrotransport |
DEC 85 |
|
| Authors:
James V. Maskowitz; William E. Rhoden; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| An investigation of electromigration has resulted in the development of apparatus and test vehicles for use in conducting research in situ both in the scanning and transmission electron microscope (SEM and TEM) respectively. The unique design of test vehicles and modification of equipment allows for the experimental use of a prototype Joule-Thompson microminiature refrigerator. The refrigerator inside the SEM allows for the direct observation of electromigration experiments while controlling the ... |
|
| Development of a Low Noise 10K Refrigeration System |
OCT 85 |
|
| Authors:
MMR TECHNOLOGIES INC MOUNTAIN VIEW CA
|
| The purpose of this contract is the development of a Low Noise, Closed Cycle, Joule Thomson refrigeration system for 10K operation. This report summarizes work completed to date on the detailed thermodynamic analysis and physical design of the refrigerator. A complete enthalpy balance for the three stage device is presented. Fabrication of the first two refrigeration stages (argon and hydrogen) has begun. A prototype compressor for single gas operation has ... |
|
| System for Investigating Superconducting Films with Surface Acoustic Waves Down to 4.5 Millikelvin and Up to 4 GHz |
14 JUL 85 |
|
| Authors:
Moises Levy; WISCONSIN UNIV-MILWAUKEE DEPT OF PHYSICS
|
| A system for investigating superconducting films with surface acoustic waves down to 4.3 millikelvin up to frequencies of 4 GHz and up to magnetic fields of 95 K Gauss has been ordered, received and assembled. A dilution refrigerator has been installed in a new laboratory. It has been tested in place down to 4.3 millikelvin. The refrigerator has a top loading probe with four interchangeable slugs which can be used ... |
|
| Heat Management System for Aircraft. |
19 MAR 1985 |
|
| Authors:
A. H. Mayer; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A novel heat management system for aircraft is provided which is based on the aircraft fuel as the heat exchange medium and comprises a dedicated thermal reserve fuel tank for containing refrigerated aircraft fuel (or other expendable liquid) which is cooled by heat exchange with the primary aircraft fuel flow to the engines, a fuel line loop for conducting fuel through a plurality of heat exchangers associated with cooling loops ... |
|
| Survey of the State-of-the-Art of Miniature Cryocoolers for Superconductive Devices |
31 DEC 84 |
63 pages |
| Authors:
J. L. Smith Jr.; G. Y. Robinson Jr.; Y. Iwasa; NAVAL RESEARCH LAB WASHINGTON DC
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| This document presents the results of a survey of the state-of-the- art as applied to cryocoolers to cool small superconducting devices. The survey included visits to over 100 facilities involved in the production or development of small cryocoolers in the United States, Japan, Europe. Specifications of commercially available cryocoolers having capacities of one of five watts in the 80 to 4 K range are presented. The survey was sponsored by ... |
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REFRIGERATION SYSTEMS
