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An investigation of aircraft heaters 36: preliminary investigation of a combustion-type aircraft heater

Description: Report presenting experimental results on the thermal performance of an aircraft combustion-type heater. The performance of the heater with a counterflow and a parallel-flow return passage on the gas side does not appear predictable by use of existing equations. The thermal conductance for the gases within the combustion chamber is predicted to be many times lower than the experimental data indicate.
Date: August 1951
Creator: Boelter, Llewellyn Michael Kraus; Elswick, W. R.; Sanders, V. D. & Rubesin, M. W.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 4: Measured and Predicted Performance of Longitudinally Finned Tubes

Description: Report presenting a study of two double tube, cylindrical, longitudinally finned heat exchangers in which hot exhaust gases pass through the annular space and ventilating air passes through the center tube in order to determine heat transfer and pressure drop performance.
Date: October 1942
Creator: Martinelli, R. C.; Weinberg, E. B.; Morrin, E. H. & Boelter, L. M. K.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 21: Measured and Predicted Performance of a Flattened-Tube Type Crossflow Exhaust Gas and Air Heat Exchanger

Description: Report presenting data on the thermal performance and the static pressure drop characteristics of a flattened-tube type crossflow exhaust gas and air heat exchanger. The measured thermal outputs and static pressure drops are compared with predicted magnitudes.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M.; Romie, F. E.; Sanders, V. D. & Sloggy, L. J. B.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 25: Use of the Thermopile Radiometer

Description: Report presenting an analysis of the thermopile radiometer as used in the measurement of irradiation and radiant power interchange is given. The theory of the instrument when used to measure irradiation and net radiant power interchange is developed, and the precautions to be observed when using it for these measurements are presented.
Date: April 1945
Creator: Boelter, L. M. K.; Bromberg, R.; Gier, J. T. & Dempster, E. R.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 14: Performance of Two Finned-Type Crossflow Exhaust Gas and Air Heat Exchangers

Description: Report presenting data on the thermal performance and the static pressure drop characteristics of two finned-type exhaust gas and air heat exchangers. One heater was constructed of copper and stainless steel while the other was constructed from aluminum alloy. The measured thermal outputs and static pressure drops are compared with predicted magnitudes.
Date: August 1944
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M. & Sloggy, L. J. B.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 14: an air and heat flow analysis of a ram-operated heater and duct system

Description: Report presenting a method of graphical analysis that allows for the prediction of the thermal and aerodynamic performance of a ram-operated heater and duct system, for cabin heating or wing de-icing, at any altitude and airplane speed. Performance can be predicted from the isothermal total pressure drop across the components of the duct system at several ventilating air rates and the thermal output of the heater at various air and exhaust gas rates.
Date: March 1944
Creator: Boelter, L. M. K.; Morrin, E. H.; Martinelli, R. C. & Poppendiek, H. F.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 35: Thermocouple Conduction Error Observed in Measuring Surface Temperatures

Description: Note presenting experimental results that verify an analysis of errors occurring when thermocouples are used to measure the temperature of surfaces exposed at temperatures different from that of the surface. The data indicate that the electrical insulation of the wires is not effective in reducing the errors involved when the thermocouples are placed normal to the surface and exposed to the ambient fluids.
Date: July 1951
Creator: Boelter, L. M. K. & Lockhart, R. W.
Partner: UNT Libraries Government Documents Department

Upper Sand Mountain Parish Solar Construction Workshops. Final performance report

Description: The Upper Sand Mountain Parish continues to employ its initial strategy for involving high school vocational students with the pre cutting and instructional assembly aid to area families. The parish project works with high school vocational classes in pre fabbing solar devices into kit form. Then, students are employed to serve as instructors for Saturday construction workshops at the local electric cooperative. Trained teams of older and unemployed adults work with youth in building solar greenhouses for those able to pay labor. Over three years, the project has assisted and built 50 to 60 attached solar greenhouses with construction teams realizing in excess of $26,000 in labor for newly developed skills. The project continues to assist owners in monitoring and developing horticulturally as well as energy producing greenhouses. During the spring of 1982, the parish assisted greenhouse owners in marketing over 60,000 bedding plants worth over $3000. Monthly Greenhouse Owner Fellowship meetings have been a helpful setting for sharing of ideas and exchange of insights. A low interest solar loan fund, offering 5% loans for three years, has assisted over 30 families in going solar. The principle for this revolving fund has almost reached the $15,000 mark. The track record for loan repayments has been exceptional. Through workshops and tours we have aquainted hundreds of people across the southeast with low cost/low technology solar projects and a workable strategy for involving community groups and students in them. With church involvement, we have provided over $25,000 in grants to over 200 area families. Workshop information and plans are available to those interested for bread box solar water heaters, food dryers, window box collectors, insulation panels, and greenhouses.
Date: February 1, 1983
Partner: UNT Libraries Government Documents Department

Test Results on D-12A-2

Description: The purpose of this report is to describe the recent tests of D-12A-2. The tests of D-12A-2 began on April 30 and ended on May 8. The unusually long test period was a result of an extensive series of magnetic field measurements in which we attempted to determine the shielding affects of a sextupole compensating coil and the decay of the currents induced in this coil. This report is short, but much of the data from the tests are included or summarized. We begin with a description of the coil and conductor, continue with the training history, the results of magnetic measurements, including the use of a sextupole compensating coil and then describe the results of heater induced quenches including estimates of axial and transverse quench propagation velocities.
Date: August 8, 1984
Creator: Hassenzahl, W.
Partner: UNT Libraries Government Documents Department

Measured strain in Nb3Sn coils during excitation and quence

Description: The strain in a high field Nb{sub 3}Sn coil was measured during magnet assembly, cool-down, excitation and spot heater quenches. Strain was measured with a full bridge strain gauge mounted directly over the turns and impregnated with the coil. Two such coils were placed in a 'common coil' fashion capable of reaching 11 T at 4.2 K. The measured steady state strain in the coil is compared with results obtained using the FEM code ANSYS. During quenches, the transient strain (due to temperature rise) was also measured and compared with the calculated mechanical time response to a quench.
Date: June 1, 2005
Creator: Caspi, S.; Barlett, S.E.; Dietderich, D. R.; Ferracin, P.; Gourlay, S. A.; Hannaford, C. R. et al.
Partner: UNT Libraries Government Documents Department

Preliminary Thermal and Thermomech-Anical Modeling for the Near Surface Test Facility Heater Experimants at Hanford: Appendix D

Description: Appendix D is a complete set of figures illustrating the detailed calculations necessary for designing the heater experiments at the Near Surface Test Facility (NSTF) at Hanford, Washington. The discussion of the thermal and thermomechanical modeling that yielded these calculations is presented in Volume 1. A summary of the figures and the models they illustrate is given in Table D1. The most important figures have also been included in the discussion in Volume 1, and Table D2 lists the figure numbers in this volume that correspond to figure numbers used there.
Date: December 1, 1978
Creator: Chan, T. & Remer, J. S.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 17: experimental inquiry into steady state unidirectional heat-meter corrections

Description: Report divided into two sections. One discusses a correction that must be applied to a heat meter when it is used at temperatures other than temperatures at which it was calibrated. The other section contains the results of an application of the two methods of correcting the heat-transfer rates for contact and heat-meter resistance to experimental data.
Date: August 1944
Creator: Boelter, L. M. K.; Poppendiek, H. F. & Gier, J. T.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 15: the emissivity of several materials

Description: Report presenting a determination of the mean effective emissivity as a function of temperature for the surfaces of several metals and insulating materials. A description and discussion of the measuring technique is presented. The results are plotted on a variety of graphs.
Date: January 1944
Creator: Boelter, L. M. K.; Bromberg, R. & Gier, J. T.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 26: Development of a Sensitive Plated-Type Thermopile for Measuring Radiation

Description: Report presenting an analysis of the factors determining the power efficiency of radiation thermopiles of the type in which receivers consist of parts of conducts themselves or of coatings or other electrically insulating materials in intimate contact with the conductors. Criterions for maximum power efficiency are calculated for these thermopiles, which can then be applied to general thermopile designs.
Date: July 1948
Creator: Boelter, L. M. K.; Dempster, E. R.; Bromberg, R. & Gier, J. T.
Partner: UNT Libraries Government Documents Department

An investigation of aircraft heaters 24: the heat meter in the transient state for unidirectional heat transfer

Description: Report describing the behavior of the heat meter when it is used in thermal circuits which are under the influence of transient potentials. Three scenarios are considered: a heat meter suddenly placed on a hot surface, a heat meter mounted on the interior surface of the cabin wall of an uninsulated airplane climbing through air of decreasing temperature, and a heat meter mounted on the interior surface of the composite cabin wall of an airplane climbing through air of decreasing temperature.
Date: September 1944
Creator: Boelter, L. M. K.; Poppendiek, H. F.; Dunkle, R. V. & Gier, J. T.
Partner: UNT Libraries Government Documents Department

Corrosion and Deposits in Regenerative Air Preheaters

Description: Report issued by the U.S. Bureau of Mines on the field tests performed on air preheaters. It also discusses the corrosion resistance of different materials, and their corrosive effects. This report contains tables, graphs, photographs and illustrations.
Date: August 1953
Creator: Barkley, J. F.; Karlsson, Hilmer; Berk, A. A.; Stark, C. F. & Burdick, L. R.
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 5: Theory and Use of Heat Meters for the Measurement of Rates of Heat Transfer Which Are Independent of Time

Description: Report presenting a description of a meter which will measure the heat flowing through surfaces. Its operation is based on the measurement of the temperature decrease through a fixed thermal resistance. Only the case of heat flow independent of time is discussed in this particular report.
Date: December 1942
Creator: Martinelli, R. C.; Morrin, E. H. & Boelter, L. M. K.
Partner: UNT Libraries Government Documents Department

Low-Cost Solar Water Heating Research and Development Roadmap

Description: The market environment for solar water heating technology has changed substantially with the successful introduction of heat pump water heaters (HPWHs). The addition of this energy-efficient technology to the market increases direct competition with solar water heaters (SWHs) for available energy savings. It is therefore essential to understand which segment of the market is best suited for HPWHs and focus the development of innovative, low-cost SWHs in the market segment where the largest opportunities exist. To evaluate cost and performance tradeoffs between high performance hot water heating systems, annual energy simulations were run using the program, TRNSYS, and analysis was performed to compare the energy savings associated with HPWH and SWH technologies to conventional methods of water heating.
Date: August 1, 2012
Creator: Hudon, K.; Merrigan, T.; Burch, J. & Maguire, J.
Partner: UNT Libraries Government Documents Department

Owens-Illinois subsystem design package for the SEC-601 air-cooled solar collector

Description: Information used to evaluate the subsystem design of the Owens-Illinois Model SEC-601 Solar Collector is presented. The collector is of modular design and is approximately 12 feet 3 inches wide and 8 feet 7 inches tall. It contains 72 collector tube elements and weighs approximately 300 pounds. Included in this report are the Subsystem Performance Specifications and the Assembly and Installation Drawings of the Solar Collectors and Manifold.
Date: February 1, 1979
Partner: UNT Libraries Government Documents Department

Freeze-protection loop for direct solar-water-heating systems. Final report

Description: Even a one-time freeze condition can do destructive damage to a direct solar water heating system. The project funded under grant DE-FG4480R4, 1-1-80 to 8-1-81, proposed to demonstrate a simple installation procedure whereby thermosiphoning warm water from storage would prevent solar collectors from freezing. Installing the freeze protection loop in owner maintained solar systems was inconclusive. Owners were not attentive to freeze warnings or did not understand the simple instructions. A controlled situation was established using a refrigerator to produce below freezing temperatures. Experiments conducted with this equipment showed that the thermosiphoning principle could not be relied on to prevent freezing. Thermosiphoning cannot be relied on to prevent freezing in a direct solar water heating system. The direct system is an effective means of heating water in north Florida, but the system must be drained, either manually or automatically, to provide reliable system protection.
Date: November 4, 1981
Partner: UNT Libraries Government Documents Department