Download or read book The Measurement of Heat Flow in the Ground and the Theory of Heat Flux Meters written by Peter Schwerdtfeger and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of heat flux meters has been examined by experimental, electrical analogue and numerical means. The results indicate the more general applicability of the flux meter equation first proposed by Philip (1961) for the special case of spheroidal meters, provided certain precautions are taken. The purely geometric parameter appearing in this equation has been related to meter shape and a functional connection has been suggested. It is proposed that pairs of thermal sensors be used to monitor thermal conductivity continuously and the use of nonuniform 'focusing' heat flux meters is recommended in cases where the physical cross section of a thermopile should remain small compared to the resultant thermal cross section. Finally a number of calibration techniques are reported, including the use of a novel radiation enclosure in which meters are temporarily tested as net radiometers, (Author).
Download or read book The Measurement of Heat Flow in the Ground and the Theory of Heat Flux Meters written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report written by and published by . This book was released on 1970 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements in Heat Transfer written by Ernst R. G. Eckert and published by Taylor & Francis. This book was released on 1976 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Terrestrial Heat Flow Density Determination written by R. Haenel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: There comes a time in the affairs of every organization when we have to sit down and take stock of where we are and where we want to go. When the International Heat Flow Committee (as it was first called), IHFC, was formed in 1963 at the San Francisco International Union of Geodesy and Geophysics with Francis Birch as its first Chairman, the principal purpose was to stimulate work in the basic aspects of geothermics, particularly the measurement of terrestrial heat-flow density (HFD) in what were then the 'geothermally underdeveloped' areas of the world. In this, the IHFC was remarkably successful. By the beginning of the second decade of our existence, interest in the economic aspects of geothermics was increasing at a rapid pace and the IHFC served as a conduit for all aspects of geothermics and, moreover, became the group responsi ble for collecting data on all types of HFD measurements. In all the tasks that are undertaken, the IHFC relies on the enthusiasm of its members and colleagues who devote much of their time to the important but unglamorous and personally unrewarding tasks that were asked of them, and we arc fortunate that our parent institutions are usually quite tolerant of the time spent by their employees on IHFC work.
Download or read book CRREL Monograph written by and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Building Applications of Heat Flux Transducers written by George E. Courville and published by ASTM International. This book was released on 1985 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculated and Field measured Soil Heat Flux written by Joseph L. Pikul and published by . This book was released on 1983 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat and water vapor flow in summer-fallowed fields in the Pacific Northwest may significantly affect the position and supply of water for germination of fall sown crops. New tillage tools and drill openers used in reduced tillage systems leave a trashy, residue covered surface in contrast to the traditional bare fallow systems. It is likely that these new management techniques cause changes in heat and water flow that produce unique profiles of soil temperature and water content. There is a need to elucidate heat and mass flow theory under field conditions appropriate to these new tillage systems. However, heat and mass flow theory has been studied almost exclusively in the laboratory using uniformly packed homogeneous soil. Heat flow theory in these experiments has generally consisted of two components: de Vries theoretical estimation of soil thermal conductivity and the Philip formulation of total heat flux consisting of heat flow responses to thermal and moisture gradients. The Philip-de Vries theory was field tested to determine if such theory could be used to project the water conservation aspects of reduced tillage systems. Soil heat flux was calculated using the theory of Philip-de Vries and then compared with soil heat fluxes experimentally determined in a Walla Walla silt loam using a null-alignment of soil temperatures and calorimetric heat flow. Comparisons at 20 depths in the top 60 cm of soil were made during mid-summer on no-till field plots with two soil moisture regimes. All components of heat flow including vapor heat flux terms were used in the theoretical calculations, but isothermal vapor flux accounted for less than 1% of the total vapor flux. Measured net daily heat flux at 0.25 cm was 22.3 and 21.7 cal cm−2 day−1 for the moist and dry treatments, respectively. Theoretical heat flux calculations at this same depth generally gave a tenfold overestimation of measured heat flux during those times of the day when large temperature gradients existed. At 9 cm, approximately the seeding depth of winter wheat, measured net daily heat flux was 14.5 and 20.6 cal cm−2 day−1 for the moist and dry treatments, respectively; respective theoretical fluxes were 15.7 and 32.8 cal cm−2 day−1. Calculated total fluxes in the top 35 cm generally overestimated by 20 and 40 percent, as compared to measured fluxes, for the moist and dry treatments, respectively. Theoretical heat flux vapor components were calculated as the difference between total and conduction heat fluxes. Soil water changes predicted by vapor flux theory agreed with measured seedzone diurnal water content changes on the dry plot. At 35 cm vapor fluxes were negligible. Heat flux by conduction at this same depth over estimated measured flux by 10% on both plots. At all depths theoretical heat flux by conduction was more seriously overestimated than the vapor components of heat flux. The Philip-de Vries heat flux model satisfactorily predicted water changes in dry soil seedbeds by vapor flux theory. Overestimation of the conduction component of the de Vries thermal conductivity produced an overestimation of calculated heat flux on both plots at all depths. Further calibration of the conduction components of the model will be needed to continue assessment of heat and vapor flux in dry seedbeds.
Download or read book Heat Generation and Transport in the Earth written by Claude Jaupart and published by Cambridge University Press. This book was released on 2010-11-11 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat provides the energy that drives almost all geological phenomena and sets the temperature at which these phenomena operate. This book explains the key physical principles of heat transport with simple physical arguments and scaling laws that allow quantitative evaluation of heat flux and cooling conditions in a variety of geological settings and systems. The thermal structure and evolution of magma reservoirs, the crust, the lithosphere and the mantle of the Earth are reviewed within the context of plate tectonics and mantle convection - illustrating how theoretical arguments can be combined with field and laboratory data to arrive at accurate interpretations of geological observations. Appendices contain data on the thermal properties of rocks, surface heat flux measurements and rates of radiogenic heat production. This book can be used for advanced courses in geophysics, geodynamics and magmatic processes, and is a reference for researchers in geoscience, environmental science, physics, engineering and fluid dynamics.
Download or read book SIPRE Report written by and published by . This book was released on with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report Corps of Engineers U S Army Cold Regions Research and Engineering Laboratory written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1968 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crustal Heat Flow written by G. R. Beardsmore and published by Cambridge University Press. This book was released on 2001-08-06 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: A handbook for geologists and geophysicists who manipulate thermal data; professionals researchers, and advanced students.
Download or read book Thermal Conductivity 22 written by Timothy W. Tong and published by CRC Press. This book was released on 1994-06-08 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book USA CRREL Technical Publications written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1972 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Flow Meters and Thermal Conductivity Measurements written by Fred George Hechler and published by . This book was released on 2013-01 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Experiment Station Series, Bulletin Number 37.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Insulation written by Frank J. Powell and published by ASTM International. This book was released on 1987 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
