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Heat may be defined as transfer of energy from a high temperature object to a low temperature object, other than by work or transfer of matter. It occurs voluntarily whenever an appropriate physical pathway exists between the two bodies. The pathway can be direct, as in conduction and radiation, or indirect like in convective circulation. In 1871 Physicist James Clerk Maxwell gave the classic Theory of Heat and defined heat according to the second law of thermodynamics as something which may be transferred from one body to another. Heat, as a form of energy has the unit joule (J) in the International System of Units (SI). British thermal unit (BTU) and the calorie are also often used by many applied fields in engineering. Watt (W), defined as joules per second is the standard unit for the rate of heat transferred.
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Scope and Importance:
In 1847 James Prescott Joule characterized the terms latent heat and sensible heat as components of heat. Latent heat is the heat released or absorbed by a chemical substance or a thermodynamic system during a change of state that occurs without a change in temperature as in phase transition like melting of ice or boiling of water.While Sensible heat is the heat transferred to a thermodynamic system that has as its sole effect a change of temperature. Both latent heat and sensible heat transfers increases the internal energy of the system to which they are transferred. Quantity of heat transferred can measured by calorimetry, or through calculations based on quantities. Calorimetry is based on the idea of quantity of heat transferred in a process. A calculation of quantity of heat transferred can rely on a hypothetical quantity of energy transferred as adiabatic work and on the first law of thermodynamics. Practical operating devices that harness transfers of energy as heat are Heat engine and Heat pump.Specific heat, also called specific heat capacity can be defined as the amount of energy that has to be transferred to or from one unit of mass (kilogram) or amount of substance (mole) to change the system temperature by a degree. Specific heat is a physical property, which means that it depends on the substance under consideration and its state as specified by its properties.
Keeping in view of the importance of heat a large of conference are being organized all over the world such as 8 in Europe like European Conference on Heat Treatment and 21st IFHTSE Congress, 23 in Asia like 15th international heat transfer conference, 12 in USA like 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, and 2 in Africa like 5 African Rift Geothermal Conference. Around 10 National symposiums and Workshops are going to be held across the globe which includes “Symposium on Convective Heat and Mass Transfer CONV-14”, “International HeatTransfer Symposium”, ISTE workshop on Heat Transfer”, “Heat Transfer Workshop, Zoetermeer” and so on.
Association and Societies:
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This page was last updated on September 29, 2020