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Liquid-metal MHD flow in a duct whose cross section changes from a rectangle to a trapezoid, with applications in fusion blanket designs

Description: This paper treats the liquid-metal MHD flow in a semi-infinite rectangular duct and a semi-infinite trapezoidal duct, which are connected by a finite-length transition duct. There is a strong, transverse, uniform magnetic field. The walls parallel to the magnetic field (sides) remain parallel, while the walls intersecting the magnetic field are twisted in the transition duct to provide the change in cross sectional shape. The left side has a constant height, while the height of the right side i… more
Date: April 1, 1986
Creator: Walker, J.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solar heating system for the First Baptist Church, 1500 E. Melgaard Road, Aberdeen, South Dakota 57401. Final report

Description: This report includes the following: (1) acceptance test plan, (2) systems performance data, (3) pictures of completed system, (4) problems in building the system, (5) description of the system, (6) major maintenance problems, (7) revised blueprints, (8) installation, operation, and maintenance manuals, and (9) recommendations.(MOW)
Date: April 16, 1979
Creator: Salem, H.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Liquid-metal flow in a rectangular duct with a non-uniform magnetic field

Description: This paper treats liquid-metal flow in rectangular ducts with thin conducting walls. A transverse magnetic field changes from a uniform strength upstream to a weaker uniform strength downstream. The Hartmann number and the interaction parameter are assumed to be large, while the magnetic Reynolds number is assumed to be small. If the magnetic field changes gradually over a long duct length, the velocity and pressure are nearly uniform in each cross section and the flow differs slightly from loc… more
Date: April 1, 1986
Creator: Walker, J.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Developing flow and heat transfer in strongly curved ducts of rectangular cross-section

Description: A numerical study of heat transfer in 90/sup 0/, constant cross-section curved duct, steady, laminar flow is presented. The work is aimed primarily at characterizing the effects of duct geometry on heat transfer by considering, especially, the role of secondary motions during the developing period of the flow. However, due consideration has also been given to varying initial conditions of velocity and temperature at the entrance section to the duct. In addition, an assessment is made of the rel… more
Date: April 1, 1979
Creator: Yee, G. & Humphrey, J.A.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

OTEC platform configuraion and integration study. Volume 2. Technical concept. Final report

Description: The primary objective of this conceptual design sutdy was to maximize the cost effectiveness of the two OTEC platform configurations, the ship and the spar with detachable modules, as they apply to commercial plants with 400 MW/sub e/ net output. Early examination of potential concept arrangements for the 400 MW/sub e/ plant using 25 or 50 MW/sub e/ power modules revealed that traditional materials and arrangements would not be capable of attaining cost effective designs. Immersing some of the … more
Date: April 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Addendum to the East Tennessee Technology Park Site-Wide Residual Contamination Remedial Investigation Work Plan Oak Ridge, Tennessee

Description: The East Tennessee Technology Park Site-Wide Residual Contamination Remedial Investigation Work Plan (DOE 2004) describes the planned fieldwork to support the remedial investigation (RI) for residual contamination at the East Tennessee Technology Park (ETTP) not addressed in previous Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) decisions. This Addendum describes activities that will be conducted to gather additional information in Zone 1 of the ETTP for… more
Date: April 1, 2011
Creator: SAIC
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling particle loss in ventilation ducts

Description: Empirical equations were developed and applied to predict losses of 0.01-100 {micro}m airborne particles making a single pass through 120 different ventilation duct runs typical of those found in mid-sized office buildings. For all duct runs, losses were negligible for submicron particles and nearly complete for particles larger than 50 {micro}m. The 50th percentile cut-point diameters were 15 {micro}m in supply runs and 25 {micro}m in return runs. Losses in supply duct runs were higher than in… more
Date: April 1, 2003
Creator: Sippola, Mark R. & Nazaroff, William W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measuring Outdoor Air Intake Rates into Existing Building

Description: Practical and accurate technologies are needed for continuously measuring and controlling outdoor air (OA) intake rates in commercial building heating, ventilating, and air conditioning (HVAC) systems. This project evaluated two new measurement approaches. Laboratory experiments determined that OA flow rates were measurable with errors generally less than 10 percent using electronic air velocity probes installed between OA intake louver blades or at the outlet face of louvers. High accuracy was… more
Date: April 16, 2009
Creator: Fisk, William; Sullivan, Douglas; Cohen, Sebastian & Han, Hwataik
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Les Software for the Design of Low Emission Combustion Systems for Vision 21 Plants

Description: Previous LES calculations for one SIMVAL case ({phi}{sub inj} = 0.7) have repeatedly shown that the heat transfer/heat losses were not correctly captured, resulting in predicted NO{sub x} emissions being much higher than measurements. In a current Navy Phase I SBIR project, we are studying ways to improve the prediction of heat transfer/heat loss in LES calculations. To improve our understanding of heat transfer at walls, a series of thermal channel flow cases were analyzed and compared to DNS … more
Date: April 1, 2004
Creator: Smith, Clifford E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Duct Tape Durability Testing

Description: Duct leakage is a major source of energy loss in residential buildings. Most duct leakage occurs at the connections to registers, plenums, or branches in the duct system. At each of these connections, a method of sealing the duct system is required. Typical sealing methods include tapes or mastics applied around the joints in the system. Field examinations of duct systems have shown that taped seals tend to fail over extended periods of time. The Lawrence Berkeley National Laboratory (LBNL) has… more
Date: April 1, 2004
Creator: Sherman, Max H. & Walker, Iain S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal Performance of Unvented Attics in Hot-Dry Climates

Description: As unvented attics become a more common design feature implemented by Building America partners in hot-dry climates of the United States, more attention has been focused on how this approach affects heating and cooling energy consumption. The National Renewable Energy Laboratory (NREL) has conducted field testing and hourly building simulations for several Building America projects to evaluate energy use in vented and unvented attics in hot-dry climates. In summer, testing of the Las Vegas prot… more
Date: April 1, 2002
Creator: Hendron, B.; Anderson, R.; Reeves, P. & Hancock, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mass Transfer at the Solid-Liquid Interface for Climbing Film Flow in an Annular Duct

Description: A method utilizing a diffusion controlled electrochemical reaction was used to measure average and instantaneous mass transfer coefficients at the solid-liquid interface in upward gas-liquid climbing film flow in a vertical annular duct. These measurements give some indication of the mechanics of flow of the film, the extent of turbulence at the inner wall, and the effect of film thickness and wave motion on the mass transfer process at the inner wall. Predictions of incipient downflow of the f… more
Date: April 9, 1968
Creator: Sutey, A. M. & Knudsen, J. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Potential Flammable Gas Explosion in the TRU Vent and Purge Machine

Description: The objective of the analysis was to determine the failure of the Vent and Purge (V&P) Machine due to potential explosion in the Transuranic (TRU) drum during its venting and/or subsequent explosion in the V&P machine from the flammable gases (e.g., hydrogen and Volatile Organic Compounds [VOCs]) vented into the V&P machine from the TRU drum. The analysis considers: (a) increase in the pressure in the V&P cabinet from the original deflagration in the TRU drum including lid eject… more
Date: April 5, 2006
Creator: Vincent, A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparison between predicted duct effectiveness from proposed ASHRAE Standard 152P and measured field data for residential forced air cooling systems

Description: The proposed ASHRAE Standard 152P ''Method of Test for Determining the Design and Seasonal Efficiencies of Residential Thermal Distribution Systems'' (ASHRAE 2002) has recently completed its second public review. As part of the standard development process, this study compares the forced air distribution system ratings provided by the public review draft of Standard 152P to measured field results. 58 field tests were performed on cooling systems in 11 homes in the summers of 1998 and 1999. Seve… more
Date: April 1, 2002
Creator: Siegel, Jeffrey A.; McWilliams, Jennifer A. & Walker, Iain S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SITE ELECTRICAL POWER SYSTEM DESCRIPTION DOCUMENT

Description: The Site Electrical Power System receives and distributes utility power to all North Portal site users. The major North Portal users are the Protected Area including the subsurface facility and Balance of Plant areas. The system is remotely monitored and controlled from the Surface Operations Monitoring and Control System. The system monitors power quality and provides the capability to transfer between Off-Site Utility and standby power (including dedicated safeguards and security power). Stan… more
Date: April 16, 1999
Creator: McCann, E. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Decontamination and demolition of a former plutonium processing facility`s process exhaust system, firescreen, and filter plenum buildings

Description: The Los Alamos National Laboratory (LANL) Decommissioning Project has decontaminated, demolished, and decommissioned a process exhaust system, two filter plenum buildings, and a firescreen plenum structure at Technical Area 21 (TA-21). The project began in August 1995 and was completed in January 1996. These high-efficiency particulate air (HEPA) filter plenums and associated ventilation ductwork provided process exhaust to fume hoods and glove boxes in TA-21 Buildings 2 through 5 when these bu… more
Date: April 1, 1996
Creator: LaFrate, Patrick J., Jr.; Stout, Daniel S. & Elliott, John W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Home test kit for duct leakage

Description: An inexpensive device whose purpose is to test for duct leakage in the home is described. This device is intended for use by homeowners and others untrained in the art of duct testing. While not as accurate as testing done by professionals, it should be able to give the homeowners enough information to justify a decision whether or not to call on professional assistance for further testing and possible remediation of their duct systems. The device has been reduced to practice.
Date: April 1, 1997
Creator: Andrews, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Single phase channel flow forced convection heat transfer

Description: A review of the current knowledge of single phase forced convection channel flow of liquids (Pr > 5) is presented. Two basic channel geometries are considered, the circular tube and the rectangular duct. Both laminar flow and turbulent flow are covered. The review begins with a brief overview of the heat transfer behavior of Newtonian fluids followed by a more detailed presentation of the behavior of purely viscous and viscoelastic Non-Newtonian fluids. Recent developments dealing with aqueous … more
Date: April 1, 1999
Creator: Hartnett, J.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of Leak Pathways in the Below Grade Ducts of the Brookhaven Graphite Research Reactor Using Perfluorocarbon Tracers

Description: The focus of this program was the characterization of the soils beneath the main air ducts connecting the exhaust plenums with the Fan House. The air plenums experienced water intrusion during BGRR operations and after shutdown. The water intrusions were attributed to rainwater leaks into degraded parts of the system and to internal cooling water system leaks. As part of the overall characterization efforts, a state-of-the-art gaseous perfluorocarbon tracer technology was utilized to characteri… more
Date: April 1, 2001
Creator: Heiser, J.; Sullivan, T.; Kalb, P.; Milian, L.; Wilke, R.; Newson, C. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Impacts of Refrigerantline Length on System Efficiency in Residential Heating and Cooling Systems Using Refrigerant Distribution.

Description: The effects on system efficiency of excess refrigerant line length are calculated for an idealized residential heating and cooling system. By excess line length is meant refrigerant tubing in excess of the 25 R provided for in standard equipment efficiency test methods. The purpose of the calculation is to provide input for a proposed method for evaluating refrigerant distribution system efficiency. A refrigerant distribution system uses refrigerant (instead of ducts or pipes) to carry heat and… more
Date: April 1, 2001
Creator: Andrews, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of Measurement Uncertainties in the Nulling Test for Air Leakage From Residential Ducts.

Description: An analysis of measurement uncertainties in a recently proposed method of measuring air leakage in residential duct systems has been carried out. The uncertainties in supply and return leakage rates are expressed in terms of the value of the envelope leakage flow coefficient and the uncertainties in measured pressures and air flow rates. Results of the analysis are compared with data published by two research groups.
Date: April 1, 2001
Creator: Andrews, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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