uncleflo
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Geothermal pile foundations - Designing Buildings Wiki
Saved by uncleflo on December 18th, 2019.
Geothermal energy is the second most abundant source of heat on earth, after solar energy. It is the natural heat energy stored in the earth. This energy is contained in about 260 billion cubic metres of rocks and metallic alloys, just below the outer surface of the earth, that are at or near their melting points (Lanterman & Lee, 2007). Calculations show that the Earth, originating from a completely molten state, would have cooled and become completely solid if the only energy input was that of the Sun, so it is believed that the ultimate source of geothermal energy is the decay of naturally radioactive isotopes (Dincer et al., 2007). The thermal energy from the earth continuously flows outwards. This heat transfer from the core to the surrounding mantle is principally via conduction. When the temperature and pressure of the system becomes high enough, some of the rocks that make up the mantle melt and form magma. As the liquid magma is less dense than surrounding rocks, it slowly rises, convecting thermal heat towards the earth’s crust (Lanterman & Lee, 2007).
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Compressible Aerodynamics Calculator
Saved by uncleflo on July 16th, 2014.
This calculator is intended to provide a faster more convenient alternative to printed tables and charts (e.g. NACA Report 1135). The core of the code was written in Javascript by William Devenport at the Aerospace and Ocean Engineering Department, Virginia Tech. Five sets of relations are included; The relations themselves are taken from standard aerodynamics texts. Symbols have their usual meanings. 'Gamma' and 'rho' are substituted for the corresponding greek letters denoting the ratio of specific heats and density. Subscript 'o' is used to refer to stagnation or total conditions, superscript '*' refers to sonic conditions.
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