Heat transfer
Heat Transfer
Heat transfer (pronounced: /hiːt ˈtransfər/) is a discipline of Thermal Engineering that concerns the generation, use, conversion, and exchange of thermal energy and heat between physical systems.
Etymology
The term 'heat transfer' is derived from the English words 'heat' and 'transfer'. 'Heat' (Old English: hǣtu, hǣto, of Germanic origin) refers to the quality of being hot or high temperature, and 'transfer' (late Middle English: from Latin transferre, from trans- ‘across’ + ferre ‘to bear’) refers to the act of moving something from one place to another.
Types of Heat Transfer
Heat transfer is classified into various types based on the process involved. These include:
- Conduction - The transfer of heat between substances that are in direct contact with each other. The better the conductor, the more rapidly heat will be transferred.
- Convection - The transfer of heat by the actual motion of a fluid in the form of currents. This can only happen in liquids and gases as they can move freely.
- Radiation - The transfer of heat by electromagnetic waves. This form of heat transfer does not require a medium and can occur in a vacuum.
Related Terms
- Thermal Conductivity - The property of a material to conduct heat.
- Heat Exchanger - A device used to transfer heat between two or more fluids.
- Thermodynamics - The branch of physics that deals with heat and temperature, and their relation to energy, work, radiation, and properties of matter.
- Heat Capacity - The measurable physical quantity that characterizes the amount of heat required to change a substance's temperature by a given amount.
External links
- Medical encyclopedia article on Heat transfer
- Wikipedia's article - Heat transfer
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