of thermal mass is shown in this comparison of how heavy and light weight constructions affect internal temperature Thermal mass is a concept in building design that describes how the mass of the building provides inertia against temperature fluctuations, sometimes known as the thermal flywheel effect ..., when outside temperatures are fluctuating throughout the day, a large thermal mass within the insulated portion of a house can serve to flatten out the daily temperature fluctuations, since the thermal mass will absorb thermal energy when the surroundings are higher in temperature than the mass, and give thermal energy back when the surroundings are cooler, without reaching thermal equilibrium . This is distinct from a material s thermal insulation insulative value, which reduces a building s thermal conductivity , allowing it to be heated or cooled relatively separate from the outside, or even just retain the occupants thermal energy longer. Scientifically, thermal mass is equivalent to thermal capacitance or heat capacity , the ability of a body to store thermal energy . It is typically ... . Thermal mass may also be used for bodies of water, machines or machine parts, living things, or any ... used instead. Background main Heat capacity The equation relating thermal energy to thermal mass is math Q C mathrm th Delta T , math where Q is the thermal energy transferred, C sub th sub is the thermal mass of the body, and T is the change in temperature. For example, if 250 J of heat energy is added to a copper gear with a thermal mass of 38.46 J C, its temperature will rise by 6.50 C. If the body consists of a homogeneous material with sufficiently known physical properties, the thermal ... specific heat capacity math bar c math . For discussion of why the thermal energy storage ... composed of numerous different materials, the thermal masses for the different components can just be added together. Thermal mass in buildings Thermal mass is effective in improving building ... more details
File Thermal bridge by Zureks.png thumb Temperature distribution in a thermal bridge A thermal bridge , also called a cold bridge , ref name Viking http www.viking house.co.uk cold bridge thermal bridge.html viking house.co.uk Cold Bridge Thermal Bridge ref is a fundamental of heat transfer where a penetration ... also known as the building enclosure, building envelope , or thermal envelope . ref name Allen ... John Wiley & Sons Inc. Fundamentals of Building Construction ref Thermal bridging is created when materials that are poor thermal insulation thermal insulators come into contact, allowing heat to flow through the path of least thermal resistance R value insulation R value or a materials effectiveness ... ref Insulation around a bridge is of little help in preventing heat loss or gain due to thermal ... that have better insulating properties, or with a section of material with low thermal conductivity ..., called a thermal break . Concept Several properties of materials affect heat transfer. Examples include thermal conductivities, specific heats, material densities, fluid velocities, fluid viscosities, and surface reflectance and emittance characteristics. Thermal bridges are characterized by multi ... models of calculation typically used in norms and standards for the thermal performance of buildings ... buildings Heavy advertising site ref are a common example of thermal bridging. In commercial construction, steel or concrete members incorporated in exterior wall or roof construction often form thermal bridges. ref name Allen Metal ties in cavity walls are another type of thermal bridge commonly found in masonry construction. ref name Allen Thermal Bridging in Construction File Waermebruecke konstruktiv.jpg thumb right 200px Thermal bridge caused by floor Classification Repeating thermal bridges ... wall Non repeating thermal bridges such as the bridging of a cavity wall by a single lintel Geometrical thermal bridges placed at the junction of two planes, such as at the corner of a wall Thermal bridge ... more details
Image TankBarrelThermalSleeve.jpg thumb right A bolt on thermal sleeve A thermal sleeve is a device around the length of a gun barrel of a large caliber gun, typically found on modern tank s. Its primary purpose is to prevent the gun barrel from being thermally distorted due to environmental conditions, especially when the barrel is already hot due to frequent firing. Thermal sleeves were originally simply insulators. They would prevent ambient conditions such as bright sunlight or winds from heating or cooling one side of a barrel more than the other which would cause a thermal distortion bending or drooping , reducing accuracy. More modern variants contain concentric inner and outer insulating sleeves with a gap in between. Versions have been created which are detachable from a given barrel so that they can be re used with a replacement barrel. Proposals exist for types that have advanced external thermal and radar profiles, reducing their thermal and radar signatures making the barrel and thereby the tank harder to detect. ref US Patent http www.patentstorm.us patents 5400691 description.html 5400691 , Rigid thermal sleeve for a gun barrel, Retrieved on 29 December 2008 ref Image Chieftain MkIII latrun 2.jpg thumb The canvas covered thermal sleeve on a Chieftain tank One of the earliest guns to use a thermal sleeve was the Royal Ordnance L11A5 Royal Ordnance L11 used on the Chieftain tank . References reflist External links Commons category Thermal sleeve artillery DEFAULTSORT Thermal Sleeve Category Firearm components Category Armoured fighting vehicle equipment Category Artillery components firearms stub he ... more details
In aviation , and particularly in the sport of gliding , a stick thermal is an illusion that the glider is climbing in a thermal when, in fact, the upward movement of the glider is caused by nothing more than the pilot pulling backwards on the control stick, causing the aircraft to climb, but lose airspeed. It is useful for a pilot to know the rate of climb of air in a thermal. They can use this to find the strongest area of lift in the thermal. A variometer can be used to measure the rate of ascent of an aircraft. However, a simple variometer does not actually measure the lift in the thermal, it measures the rate of ascent of the aircraft. So a pilot may be inside a thermal that is moving upwards at 2 metres per second, but the pilot may be diving their aircraft at 2 metres per second. So the variometer shows zero rate of climb, and does not indicate the presence of the thermal. A Variometer Total energy compensation total energy compensated variometer will show the actual rate of climb of the thermal, regardless of the movement of the aircraft. A stick thermal is where an uncompensated variometer indicates that an aircraft is ascending or descending due to pilot input the joystick . ref http books.google.co.nz books?id y1CCxCYbXEMC&pg SA4 PA8&lpg SA4 PA8&dq 22stick thermal 22 gliding&source bl&ots 6X70C4rgsM&sig E1sxiVQ355ojpvtO5WreM75nPJU&hl en&ei nK67S7 SBs HkAWA0LDuDQ&sa X&oi book result&ct result&resnum 1&ved 0CAYQ6AEwAA v onepage&q &f false Glider Flying Handbook ref The pilot may believe he is in a thermal as the variometer indicates that he is ascending, but in fact he is ascending due to his own control of the aircraft. Notes Reflist Category Aeronautics Category Gliding ... more details
copy edit date July 2011 Image Thermal paper.jpg thumb A ticket printed on thermal paper. A heat source near the paper will color the paper. File ThermalPaperG3 TMG.JPG thumb Paper roll for thermal transfer printer Thermal paper is a special fine paper that is coated with a chemical that changes color when exposed to heat. It is used in thermal printer s and particularly in inexpensive or lightweight ... enough heat from friction to produce a mark on such paper. Most direct thermal papers require a protective topcoating to reduce fading of the thermal image caused by exposure to UV light, water ... or eliminate residue from the thermal coating on the thermal printheads provide better anchorage of flexographic printing inks applied to the thermal paper focus the heat from the thermal printhead on the active coating. History The earliest direct thermal papers were developed by NCR Corporation using ... technology. Texas Instruments invented the thermal print head in 1965, and the Silent 700 , a computer terminal with a thermal printer, was released to the market in 1969. The Silent 700 was the first thermal print system that printed on thermal paper. During the 1970s, Hewlett Packard integrated thermal paper printers into the design of its HP9800 series desktop computers, and integrated into the top ... sensitive label producers such as Avery Dennison became major consumers of direct thermal paper for label applications. In the late 1980s and early 1990s, thermal transfer , Laser printer laser ... began to take away industrial and warehouse barcode applications due to better durability. Direct thermal ... receipts, etc. . During 1998, Nintendo used thermal paper technology for their Game Boy Printer . In 2006, NCR Corporation s Systemedia division introduced two sided thermal printing technology, called 2ST Health and environmental concerns File No phenol cash receipt.JPG thumb Thermal cash receipt with text produced without any phenol chemistry Some thermal papers are coated with Bisphenol A BPA ... more details
Image Bose Einstein condensate.png 250px thumb right Bose Einstein condensate representative image of thermal physics . Thermal physics is the combined study of thermodynamics , statistical mechanics , and kinetic theory . This umbrella subject is typically designed for physics students and functions to provide a general introduction to each of three core heat related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics. ref cite book last Chang Lee first Joon title Thermal Physics Entropy and Free Energies publisher World Scientific year 2001 isbn 9810248741 ref Overview Thermal physics, generally speaking, is the study of the statistical nature of physical systems from an energetic perspective. Starting with the basics of heat and temperature , thermal physics analyzes the first law of thermodynamics and second law of thermodynamics from the statistical perspective, in terms of the number of microstate statistical mechanics microstate s corresponding to a given macrostate . In addition, the concept of entropy is studied via Quantum mechanics quantum theory . A central topic in thermal physics is the canonical probability distribution . The electromagnetic nature of photons and phonons are studied which show ... form a basis for both, provided one incorporates quantum theory. Other topics studied in thermal ... as mean free path , viscosity , and Heat conduction conduction . ref Ralph, R. 1999 . Thermal ... of thermal and statistical physics Thermal science Thermodynamics Thermodynamic instruments References ... Kroemer, Herbert Kittel, Charles title Thermal Physics 2nd ed. publisher W. H. Freeman Company year 1980 id ISBN 0 716 71088 9 cite book author Schroeder, Daniel V. title An Introduction to Thermal Physics ... thermal links.html Thermal Physics Links on the Web Physics footer Category Physics cs Termika ja ru simple Thermal physics sk Termika zh ... more details
Unreferenced stub auto yes date December 2009 For the use of the term in thermodynamics and statistical mechanics Thermal bath thermodynamics A thermal bath is a warm body of water. It is often referred to as a spa , which is traditionally used to mean a place where the water is believed to have special health giving properties, though note that many spas offer cold water or mineral water treatments. A thermal bath may be part of a destination spa or the reason that a spa town exists. Notable baths Bad Nauheim Bad Sauerbrunn San Pellegrino Sz chenyi Baths Gell rt Baths See also Spa Mineral spa Hot spring Heat reservoir Balneotherapy Hydrotherapy Spa town Steam shower DEFAULTSORT Thermal Bath Category Bathing Category Natural environment based therapies Alt med stub ... more details
A thermal reservoir , a short form of thermal energy reservoir , or thermal bath is a thermodynamic system with a heat capacity that is large enough that when it is in thermal contact with another system of interest or its environment, its temperature remains effectively constant. ref name boles Cite book last1 Cengel first1 Yunus A. last2 Boles first2 Michael A. title Thermodynamics An Engineering Approach year 2002 publisher McGraw Hill location Boston isbn 0 07 121688 X pages 247 ref It is an effectively infinite pool of thermal energy at a given, constant temperature . The temperature of the reservoir does not change irrespective of whether heat is added or extracted. As it can act as a source and sink of heat it is often also referred to a heat reservoir or heat bath . Lakes, oceans and rivers often serve as thermal reservoirs in geophysical processes, such as the weather. In atmospheric science, large air masses in the atmosphere often function as thermal reservoirs. References reflist DEFAULTSORT Heat Reservoir Category Thermodynamics Physics stub ca Focus cal ric es Foco cal rico fa ko ja sl Toplotni rezervoar zh ... more details
For the type of printer which uses sparks and aluminised paper and is sometimes referred to as a thermal printer , see spark printer . History of printing Image Sharp CE 126P.jpg thumb A thermal printer or direct thermal printer produces a printed image by selectively heating coated thermochromic paper , or thermal paper as it is commonly known, when the paper passes over the thermal Computer printer ... direct thermal printers can print both black and an additional color often red by applying heat at two different temperature s. Thermal transfer printer Thermal transfer printing is a related method ... What Are Direct Thermal and Thermal Transfer RFID Printers? , RFID Radio ref Essential mechanisms A thermal printer comprises these key components Thermal head generates heat prints on paper Platen a rubber roller that feeds paper Spring applies pressure to the thermal head, causing it to contact ... sensitive paper is inserted between the thermal head and the platen. The printer sends an Current electricity electrical current to the Thermal resistance heating elements of the thermal head, which generate ... changes color where heated. Such a printing mechanism is known as a thermal system or direct system ... thermal printers are actually dot matrix printer s, though they are not so called. The paper is impregnated ... are embedded with firmware to manage the thermal printer mechanisms. The Firmware can manage multiple ... Ocean Exploration EPC Thermal Printer.jpg thumb right 200px Thermal printer used in seafloor exploration Thermal printers print more quietly and usually faster than impact dot matrix printer s. They are also .... Roll based printers can be rapidly refilled. Commercial applications of thermal printers include ... cardiac monitors. Through the 1990s many fax machines used thermal printing technology. Toward the beginning of the 21st century, however, Thermal transfer printer thermal wax transfer , Laser printer laser , and Inkjet printer inkjet printing technology largely supplanted thermal printing technology ... more details
Expert subject date March 2011 Thermal science is the combined study of thermodynamics , fluid mechanics , heat transfer , and combustion . Overview Introductory subjects studied in thermal science generally are focused on thermodynamics . These include studies of properties of pure substances, pressure volume temperature diagrams, the ideal gas law , heat and it relationship to Work thermodynamics work , heat transfer , the laws of thermodynamics , Heat engine engine and refrigeration cycles, and combustion . Another area of concern in thermal science is fluid mechanics . These include fluid statics , fluid flows, e.g. laminar flow vs. turbulent flow , the Bernoulli s principle Bernoulli equation . The applicability of this area is piping networks, turbo machineries, airfoils. Heat transfer has applications for heat exchangers , heat engines , HVAC heating, ventilating, and air conditioning , and cooling of microelectronics . Combustion involves both thermal effects and chemical reaction. Intensive study of thermal sciences requires additional knowledge and experience in other areas such as Experiment experimental techniques and Numerical analysis numerical or computational methods . See also portal Physics Thermal physics Mechanical engineering Chemical engineering Architectural engineering References Potter, M. & Scott, E. 2003 . Thermal Sciences An Introduction to Thermodynamics, Fluid Mechanics, and Heat Transfer. New York Thomson Engineering. ISBN 0 534 38521 4 Faghri, A., Zhang, Y., and Howell, J. R. 2010 . Advanced Heat and Mass Transfer. Global Digital Press, Columbia, MO. ISBN 978 0984276004 Further reading https www.thermalfluidscentral.org e books book intro.php?b 37 Advanced Heat and Mass Transfer An free online textbook http thermalscience.vinca.rs Thermal Science International Scientific Journal External links https www.thermalfluidscentral.org Thermal Fluids Central DEFAULTSORT Thermal Science Category Thermodynamics Category Mechanical engineering Category ... more details
File Thermal oxidizer megtec systems.jpg thumb right A thermal oxidizer or thermal oxidiser is a process ... temperature and releases them into the atmosphere. Principle Thermal Oxidizers are typically used to destroy .... These pollutants are generally hydrocarbon based and when destroyed via thermal combustion they are chemically changed to form CO2 and H2O. Regenerative thermal oxidizer RTO One of today s most widely accepted air pollution control technologies across industry is a Regenerative Thermal Oxidizer, commonly referred to as a RTO. They are very versatile and extremely efficient thermal efficiency .... Regenerative Thermal Oxidizers are ideal in a range of low to high VOC concentrations up to 10 g m3 solvent. There are currently many types Regenerative Thermal Oxidizer on the market with the capabitlity ... heat exchanger s in the towers can be designed for thermal efficiencies as high as 97 . ref name test http www.thecmmgroup.com regenerative thermal oxidizer The CMM Group , ref The VOC s are oxidised ... without support fuel using the energy within the solvent, ie auto thermal or self sustaining. At higher ... name test http www.thecmmgroup.com thermal oxidizer Thermal Recuperative Oxidizers , The CMM Group ref As an example, the thermal ignition temperature of carbon monoxide is at 609 C Carbon monoxide ...&doc 9 ref . This can result in even lower operating costs compared to a Regenerative Thermal Oxidizer ... to operate both as Regenerative Catalytic Systems and Regenerative Thermal Oxdizers. When these systems ... of the active material Sintering . Ventilation air methane thermal oxidizer VAMTOX Ventilation Air Methane Thermal Oxidizers are used to destroy methane in the exhaust air of underground coal mine shafts. Methane is a greenhouse gas and, when destroyed via thermal combustion, is chemically altered ... s , thereby maintaining the temperature at or above what is necessary to support auto thermal operation. Thermal recuperative oxidizer A less commonly used thermal oxidizer technology is a thermal recuperative ... more details
Unreferenced date December 2009 The thermal velocity or thermal speed is a typical velocity of the thermal motion of particles which make up a gas, liquid, etc. Thus, indirectly, thermal velocity is a measure of temperature. Technically speaking it is a measure of the width of the peak in the Maxwell Boltzmann distribution Distribution of the velocity vector Maxwell Boltzmann particle velocity distribution . Note that in the strictest sense thermal velocity is not a velocity , since velocity usually describes a vector geometric vector rather than simply a scalar physics scalar speed . Since the thermal velocity is only a typical velocity, a number of different definitions can be and are used. Taking math k B math to be the Boltzmann constant , math T math is the temperature, and math m math is the mass of a particle, then we can write the different thermal velocities In one dimension If math v th math is defined as the root mean square of the velocity in any one dimension i.e. any single direction , then math v th sqrt frac k BT m math If math v th math is defined as the mean of the magnitude of the velocity in any one dimension i.e. any single direction , then math v th sqrt frac 2 k BT pi m math If math v th math is defined as the math 1 e math half width of the thermal distribution or if math v th math is defined such that a particle with this speed has an energy of math k B T math , then math v th sqrt frac 2k BT m math . In three dimensions If math v th math is defined as the root mean square of the total velocity in three dimensions , then math v th sqrt frac 3k BT m math . If math v th math is defined as the mean of the magnitude of the velocity of the atoms or molecules, then math v th sqrt frac 8k B T m pi math DEFAULTSORT Thermal Velocity Category Thermodynamics Category Statistical mechanics Physics stub ru ... more details
A thermal bar is a hydrodynamic feature that forms around the edges of holomictic lakes during the seasonal transition to Stratification water stratified conditions, due to the shorter amount of time required for shallow areas of the lake to stratify. Description During the process of lake stratification , shallow areas generally become stratified before deeper areas. In large lakes this condition may persist for weeks, during which a temperature Weather front front known as a thermal bar forms between the stratified and unstratified areas of the lake. The thermal bar generally forms parallel to shore and moves toward the lake center as deeper areas of the lake stratify. While thermal bars can form in both fall and spring season spring , most studies of the thermal bar have investigated aspects ... to form. At the lake surface, the thermal bar may be visible as a foam line between the stratified water shoreward of the thermal bar and unstratified water on the offshore side. At this convergence ... for freshwater, a process known as cabbeling. The downwelling of dense water at the thermal bar acts ... thermal bars using their thermal characteristics as well as the concentration of suspended materials ... of the thermal bar slope away from the bar, producing a pressure gradient force that when balanced ... matter along the shore. The thermal bar phenomena was first described by Fran ois Alphonse ..., K. D. Kreiman, and A. Yu. Terzhevik, The Thermal Bar, Journal of Fluid Mechanics 236 ... a Thermal Bar in Lake Baikal, Journal of Great Lakes Research 22, no. 1 1996 5 14 ref and the Laurentian Great Lakes . ref G. K. Rodgers, The thermal bar in Lake Ontario, spring 1965 and winter 1965 ...., Publ. 15. ref Ecological significance Although a temporary seasonal feature, the thermal bar plays ... Vernal Thermal Front, Estuaries 16, no. 1 1993 92 103. ref . See also Water molecule Density of water ... Kay, A review of the physics and ecological implications of the thermal bar circulation, Limnologica ... more details
File Chloryl hexafluoroantimonate xtal 2008 Cl coordination CM 3D ellipsoids.png thumb right 200px A thermal ellipsoid model of the coordination environment of the chlorine atom in the crystal structure of chloryl chloryl hexafluoroantimonate , ClO sub 2 sub SbF sub 6 sub , showing F Cl interactions. Thermal ellipsoids , more formally termed atomic displacement parameters , are ellipsoid s used in crystallography to indicate the magnitudes and directions of the thermal vibration of atom s in crystal structure s. Since the vibrations are usually anisotropic different magnitudes in different directions in space , an ellipsoid is a convenient way of visualising the vibration and therefore the time averaged position of an atom in a crystal. Thermal ellipsoids can be defined by a tensor , a mathematical object which allows the definition of magnitude and orientation of vibration with respect to Cartesian coordinate system three mutually perpendicular axes . The three principal axes of the thermal vibration of an atom are denoted math U 1 math , math U 2 math , and math U 3 math , and the corresponding thermal ellipsoid is based on these axes. The size of the ellipsoid is scaled so that it occupies the space in which there is a particular probability of finding the electron density of the atom. The particular probability is usually 50 . ref Massa2nd pages 35 37 ref See also Debye Waller factor References reflist Category Crystallography ... more details
Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature . ref name eb http www.britannica.com eb article 9072068 thermal energy Thermal energy entry in Britannica Online ref The internal energy, also often called the thermodynamic energy, includes other forms of energy in a thermodynamic system in addition to thermal ... binding energy that binds the sub atomic particles of matter. Microscopically, the thermal energy is partly ... in a large ensemble. In ideal monatomic gases, thermal energy is entirely kinetic energy. In other substances in cases where some of thermal energy is stored in atomic vibration, this vibrational part of the thermal energy is stored equally partitioned between potential energy of atomic vibration, and kinetic energy of atomic vibration. Thermal energy is thus equipartition theorem equally ... on the temperature see heat capacity for discussion of this phenomena . Macroscopically, the thermal energy of a system at a given temperature is related proportionally to its heat capacity . Thermal energy is distinct from heat . Thermal energy is a state function, a property of a system, while ... property of matter. Matter does not contain heat, but rather thermal energy. Heat is thermal energy ... of a temperature difference. ref name speyer cite book title Thermal Analysis of Materials author ... by other terms such as thermal energy or latent energy when this energy is no longer in net ... of the thermal component of the thermodynamic internal energy . ref When two thermodynamic ... energy as heat, which is a transfer of thermal energy from the system of higher temperature to the colder ... changes. This work may be used in heat engines to convert thermal energy into other forms of energy ... exchange of thermal energy vanishes heat ceases. Definitions Thermal energy is the portion .... ref name eb ref name speyer The thermal energy of a system scales with its size and is therefore ... more details
Thermal resistance is a heat property and a measure of a temperature difference by which an object or material resists a heat flow heat per time unit or thermal resistance . Thermal resistance is the reciprocal thermal conductance . Thermal resistance R has the units m sup 2 sup K W. Specific thermal resistance or specific thermal resistivity R sub sub in K m W is a material constant . Absolute thermal ... of a heat sink . Absolute thermal resistance Absolute thermal resistance is the temperature difference ... of thermal conductance . The SI units of thermal resistance are kelvin s per watt or the equivalent degrees Celsius per watt the two are the same since as intervals 1 K 1 C . The thermal ... an electronics point of view Equivalent thermal circuits Image Equivalient thermal circuit.PNG thumb The diagram shows an equivalent thermal circuit for a semiconductor device with a heat sink br math ... is the device s absolute thermal resistance from junction to case. br math R theta CH math is the absolute thermal resistance from the case to the heatsink. br math R theta HA math is the absolute thermal ... by constant current sources, absolute thermal resistances are represented by resistors and thermal capacitances by capacitors. The diagram shows an equivalent thermal circuit for a semiconductor ... parameters in the datasheet called the absolute thermal resistance from junction to case symbol ... before it overheats. The calculations are as follows. Total absolute thermal resistance from junction to ambient math R theta JC R theta B math where math R theta B math is the absolute thermal ... of the bond for example, a thermal bonding pad or thermal transfer grease might be used to reduce the absolute thermal resistance. Maximum temperature drop from junction to ambient math T JMAX ... across a given absolute thermal resistance math R theta math with a given heat flow math Q math through ... conducting materials, simply by adding together the absolute thermal resistances of the layers and the temperature ... more details
about the temperature sensor enclosure thermowell the personal protective covering space blanket Cleanup date May 2010 Unreferenced date November 2011 A thermal blanket is a device used in in situ thermal desorption ISTD to clean large area soil contamination. The primary function of a thermal blanket is to heat the soil to the boiling point of the contaminants usually 800 to 1,000 C . The contaminants break down. A vacuum pulls the resulting gas along with some contaminants into a separate air cleaner that may use various methods, such as carbon filters and high heat ovens, to completely destroy the contaminants. Deep contaminations are handled using a similar method with a deep penetrating heat source. This is commonly referred to as an ISTD thermal well. Concerns There is a concern that as a contaminant becomes heated, it may leak outside of the area of the thermal blanket. Therefore, the blanket must completely cover the contaminated area and have a strong enough vacuum to prohibit the spread of contaminations. Incomplete destruction of contaminants may lead to the introduction of Dioxins and dioxin like compounds dioxins and furans into the air. This method has not been effectively tested on organic contaminants. See also Soil contamination References cite journal author I. E. T. Iben, W. A. Edelstein, R. B. Sheldon, A. P. Shapiro, E. E. Uzgiris, C. R. Scatena, S. R. Blaha, W. B. Silverstein, G. R. Brown, G. L. Stegemeier, and H. J. Vinegar title Thermal Blanket for In Situ Remediation of Surficial Contamination A Pilot Test journal Environ. Sci. Technol. year 1985 volume 30 issue 11 pages 3144 3154 doi 10.1021 es9506622 External links http www.cpeo.org techtree ttdescript thermal.htm A description of thermal blankets DEFAULTSORT Thermal Blanket Category Environmental soil science ca Manta t rmica ... more details
In geology and geophysics , thermal subsidence is a mechanism of subsidence in which conduction heat conductive cooling of the mantle geology mantle thickens the lithosphere and causes it to decrease in elevation. This is because of thermal contraction as mantle material cools and becomes part of the mechanically rigid lithosphere, it becomes more dense than the surrounding material. Additional material added to the lithosphere thickens it and further causes a buoyancy buoyant decrease in the elevation of the lithosphere. This creates accommodation space into which sediments can deposit, forming a sedimentary basin . Category Geodynamics Geology stub ... more details
Merge from Thermal rectifier date August 2010 The term thermal diode is sometimes used for a possibly non electrical device which causes heat to flow preferentially in one direction. Or, the term may be used to describe an electrical semiconductor diode in reference to a thermal effect or function. Or the term may be used to describe both situations, where an electrical diode is used as a heat pump or thermoelectric cooler. Introduction The diode is a temperature sensor. It is a pnp bipolar junction transistor whose base terminal is grounded externally and constant current is pumped through emitter which develops voltage across base emitter junction. One way heat flow A thermal diode can be a heat engine which converts a heat difference directly into electric power . a heat engine working backwards as a refrigerator , such as a Stirling engine a type of Heat pipe which will only allow heat to flow from the evaporator to the condenser. When the condenser is hotter than the evaporator, the coolant ... the destination heat flows with a low thermal resistance towards the destination. Electrical diode thermal ... of the processor s die. This application of thermal diode is based on its property to change voltage ... decreases. ref http www 01.ibm.com ref Microprocessors having high clock rate encounter high thermal loads. To monitor the temperature limits thermal diodes are used. They are usually placed in that part ... with the temperature of the diode. All modern Intel CPUs have on chip thermal diodes. As they are right ... diode Advancements A team at MIT is working for construction of thermal diodes that convert heat to electricity ... production. The efficiency of present thermal diodes is about 18 between the temperature range of 200 300 degree celsius.The researchers have found various ways of improving the efficiency of the thermal ... in semiconductor thermal diode efficiency http doc.tms.org ezMerchant prodtms.nsf ProductLookupItemID ... Low Grade Heat into Electricity Equations for semiconductor thermal diodes DEFAULTSORT Thermal Diode ... more details
Thermal hydrolysis is the process where waste or sludge is boiled under high pressure and high temperature, between 160 180 degrees. Cells rich in energy are released and the solution gives a doubling of the amount of biogas compared to the traditional solutions. The biogas can be used to generate power and heat. The process provides more energy than used in the hydrolysis , which results in reduced costs of sewage pollution. The end product is disinfected , i.e. germ free. Sources Veolia Water Solutions & Technologies 2 March 2010 . http source.theengineer.co.uk plant equipment energy waste emissions management sludge handling thermal hydrolysis improves sludge digestion 368882.article Thermal hydrolysis improves sludge digestion . source.theengineer.co.uk Category Equilibrium chemistry Category Chemical reactions Category Biodegradable waste management Renewable energy stub ... more details
Thermal transmittance , also known as R value insulation U value U value , is the rate of transfer of heat ... of a nowiki building nowiki have a low thermal transmittance whereas poorly insulated parts of a building have a high thermal transmittance. A U T sub 1 sub T sub 2 sub where is the heat transfer in watts, U is the thermal transmittance, T sub 1 sub is the temperature on one side of the structure ... metres. Thermal transmittances nowiki of nowiki most walls and roofs can be calculated using ISO 6946 .... For most ground floors it can be calculated using ISO 13370. For most window s the thermal transmittance can be calculated using ISO 10077 or ISO 15099. ISO 9869 describes how to measure the thermal transmittance of a structure experimentally. Typical thermal transmittance values for common building ... insulated floors 0.2 W m K poorly insulated floors 1.0 W m K In practice the thermal transmittance is strongly affected by the quality of workmanship and if insulation is fitted poorly, the thermal transmittance can be considerably higher than if insulation is fitted well. Calculating thermal transmittance When calculating a thermal transmittance it is helpful to consider the building s construction ... is 1.64 K m W. The thermal transmittance of the structure is the Multiplicative inverse reciprocal of the total thermal resistance. The thermal transmittance of this structure is therefore 0.61 ... to allow for mortar joints in calculating the thermal transmittance of a wall, as in the following ... K 0.02 K m W inside surface 0.13 K m W The average thermal resistance of the bridged layer depends upon ... taken up by the light concrete blocks. To calculate thermal transmittance when there are bridging ... min sub . R sub max sub can be thought of as the total thermal resistance obtained if it is assumed that there is no lateral flow of heat and R sub min sub can be thought of as the total thermal resistance ... about how to deal with bridging is given in ISO 6946 . Measuring thermal transmittance Whilst calculation ... more details
In physics , thermal conductivity , math k math or denoted math lambda math , is the List of materials ... of high thermal conductivity occurs at a higher rate than across materials of low thermal conductivity. Correspondingly materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation . Thermal conductivity of materials is temperature dependent. The reciprocal of thermal conductivity is thermal resistivity. Units of thermal conductivity In the International System of Units SI , thermal conductivity is measured ... thermal conductivity is measured in Btu hr ft F where 1 Btu hr ft F 1.730735 W m K . ref Perry s Chemical Engineers Handbook, 7th Edition, Table 1 4 ref Other units which are closely related to the thermal ... industry makes use of units such as the R Value resistance value and the U Value thermal transmittance . Although related to the thermal conductivity of a product R and U values are dependent on the thickness ... and the Thermal Comfort Clo which express thermal resistance of a material in a way analogous to the R ... based on the SI units of measurement . Measurement main Thermal conductivity measurement There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range of materials, depending on the thermal properties and the medium temperature. There is a distinction .... Experimental values File Thermal conductivity.svg thumb 550px Experimental values of thermal conductivity. main List of thermal conductivities Thermal conductivity is important in material science ... standards. Several materials are shown in the list of thermal conductivities . These should be considered ... for computer cooling or turbine blades usually use high thermal conductive materials such as silver ... low thermal conductive materials such as polystyrene and alumina are used to separate warm hot parts from cold ones. Definitions The reciprocal of thermal conductivity is thermal resistivity , usually ... more details
Orphan date February 2009 Unreferenced date January 2007 A thermal optimum is either a portion of a specified geological time span in which the average temperature was above that of the average temperature for the entire specified time or the optimum range within which a biological process may take place or the ambient optimal range for a species Ecological niche niche . In geology, scientists speak of a Holocene climatic optimum Holocene thermal optimum or maximum , for example, when referring to the warm period from 9000 to 5000 years before the present, in which an overall rise in average temperature is seen in evidence from ice cores and from stable isotope data. Scientists are interested in these periods because they may be clues to evolution ary pressures experienced by species during large spans of time. In biology a thermal optimum describes the ideal boundaries for biological processes such as growth and development, and is usually characteristic of a species or population. Most biological processes are dependent upon enzymatic activity that can be impacted by the organism s body temperature, which in term is a function of the organism s metabolism and environment as each enzyme ... may then be dependent upon the thermal optima for all of its necessary biological processes. Fact date February 2007 In animals that inhabit the wave tossed tidal pools of rocky shore s thermal optima ..., and lack of thermal insulation from the buffering effects of water due to its specific heat capacity ... a high thermal optimum may still be able to function in this environment, while one with a lower thermal optimum may have its metabolic processes shut down during the drying period of exposure. An organism may be confined to a limited range of habitats due to the population s thermal optima, while another population may have a different range of habitats open to it due to a different thermal optima ... environmental thermal optima for different species. Fact date February 2007 References references ... more details
Refimprove date February 2010 File Cool Green Bag Large.jpg thumb Example of a thermal bag File Hot Cold Bag Small.jpg thumb Example of a thermal bag A thermal bag is a type of insulated shipping container . It is usually a bag made of materials that have thermal insulation properties and is used to help maintain the temperature of any contents i.e. cold items stay cold, hot items stay hot . Commercial thermal shopping bags carried by grocery and retail outlets, as a means to help their customers carry their temperature sensitive purchases home without breaking the cold chain , were first introduced in Europe in the mid 1980 s. Thermal bags for use with pizza were patented in 1983 by Ingrid Kosar of Gilberts, Illinois for the specific use of allowing delivered pizzas to stay hotter, longer. The first commercial application of this thermal bag was by the Domino s Pizza chain in 1984. Citation needed date July 2011 Medical use Thermal pharmaceutical bags are designed to provide a method for pharmacists to supply their customers with a way to transport and protect their medications from extreme outside temperature changes, as well as shocks and light. They have been in use for more than 15 years in Europe by major drug companies to help preserve the cold chain . Vaccines are a good example of temperature sensitive products which need to be kept at the right temperatures from the day it is being manufactured until being injected. Most should be maintained within the recommended temperature range of convert 2 C abbr on to convert 8 C abbr on . Vaccines are delicate biological substances that can become less effective or destroyed if they are frozen, allowed to get too hot, or exposed to direct sunlight or fluorescent light. According to the World Health Organisation, at least ... needed date December 2009 Materials Thermal bags are usually manufactured with varying quantities ... dmoz.org and link back to that category using the dmoz template. DEFAULTSORT Thermal Bag Category ... more details
File ThermalRunaway.png thumb right Diagram of thermal runaway. Thermal runaway refers to a situation ... words, the term thermal runaway is used whenever a process is accelerated by increased temperature ... rise. In electrical engineering , thermal runaway is typically associated with increased current .... Thermal runaway can occur in civil engineering , notably when the heat released by large amounts of curing concrete is not controlled. In the science of astrophysics , thermal runaway of thermonuclear ... In chemical engineering , thermal runaway is a process by which an exothermic reaction goes out ... . Thermal runaway occurs when the reaction rate increases due to an increase in temperature ... of methyl isocyanate gas from a Union Carbide plant in Bhopal, India in 1984. Thermal runaway is also a concern in hydrocracking Hydrocracking hydrocracking , an oil refinery process. Thermal runaway ... , where thermal runaway heated a reaction to temperatures such that in addition to the intended ... 0 7506 4883 7 ref Thermal runaway is most often caused by failure of the chemical reactor reactor ... thermal runaway. Similarly, in flow chemistry flow reactors , localized insufficient mixing causes hotspots to form, wherein thermal runaway conditions occur, which causes violent blowouts of reactor ... 2009 09 18 175 times and then the catastrophe.php ref Thus, industrial scale reactions prone to thermal ... they are very prone to hazardous thermal runaway. For example, in Swern oxidation , the formation of sulfonium ... undergoes explosive thermal runaway. ref http pipeline.corante.com archives 2008 04 30 how ... energy than the colder areas potentially dangerous especially for thermal insulators, where the heat ... thermal runaway materials . This phenomenon occurs in some ceramics . Electrical engineering Some ... or positive feedback effect of thermal runaway can cause failure, sometimes in a spectacular fashion ... typically incorporate current limiting protection, such as thermal fuses, circuit breakers, temperature ... more details
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