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Thermal .
| Глоссарий по архитектуре и конструкциям |
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Conductance, английский
- Of a tube, manifold, or leak path, flow characteristics expressed as a volumetric flow rate in m3/s. see also leakage rate; mass flow rate; rotameter; throughput. d
- (1) in leak testing, the flow characteristics of a tube, manifold or leak path expressed in m3·s–1. (2) transmission of electric current through material. conductance (g) is measured in siemens (s). inversely related to electrical resistance (r):
Conduction, английский
- Conduction
- The direct transfer of heat energy through a material.
- The transfer of energy through a solid without motion of the conducting solid as a whole. steady-state conduction calls if the temperature at each point is independent of time. unsteady or transient conduction situations changes with time (time dependant)
- The process of passing heat, sound or nervous impulses from one part of the body to another
- Проводимость; электрическая проводимость; электропроводность
- The transfer of heat energy through matter.
- The transfer of heat energy in materials (usually solids) via molecular scale vibrations and collision interactions.
- Heat transfer to another body or within a body by direct contact.
- Heat transfer occurring when more energetic particles collide with — and thus impart some of their heat energy to — adjacent less energetic (slower moving) particles. this action is passed on from one atom (or free electron) to the next in the direction of cooler regions. thus, heat always flows from a warmer to a cooler region.1 conductivity, thermal (k): material property defining the relative capability to carry heat by conduction in a static temperature gradient. conductivity varies slightly with temperature in solids and liquids and with temperature and pressure in gases. it is high for metals (copper has a k of 380 w·m–1·k–1) and low for gases and porous materials (concrete has a k of 1.0 w·m–1·k–1).3 682 infrared and thermal testing
- Heat transfer occurring when more energetic particles collide with — and thus impart some of their heat energy to — adjacent less energetic (slower moving) particles. this action is passed on from one atom (or free electron) to the next in the direction of cooler regions. thus, heat always flows from a warmer to a cooler region. compare convection; radiation. conductivity, electrical (?): ability of material to transmit electric current, measured in siemens per meter. reciprocal or inverse of resistivity ?: conductivity, thermal (k): material property defining the relative ability to carry heat by conduction in a static temperature gradient. conductivity varies slightly with temperature in solids and liquids and with temperature and pressure in gases. it is high for metals (copper has a k of 380 w·m–1·k–1) and low for gases and porous materials (concrete has a k of 1.0 w·m–1·k–1). compare capacity, thermal.
Emissivity, английский
- The ability of an object to radiate and absorb energy from its surroundings measured as a ratio of the actual object emission to the blackbody equivalent emission
- The ratio of the radiant energy emitted by any source to that emitted by a blackbody at the same temperature.
- Коэффициент излучения
- The ratio of radiation emitted by a surface to the radiation emitted by a blackbody at the same temperature.
- The energy emission rate usually expressed as r/c/hr @ 1 ft or mr/mc/hr @ 1 ft.
- Variable ratio of the total energy radiated by a given surface at a given temperature to the total energy radiated by a blackbody at the same temperature. emissivity can be total, directional or hemispherical. emissivity is a surface phenomenon depending on surface condition and composition. smooth materials have lower emissivities than rough or corroded materials.1 emissivity values range between 0 for a perfect reflector to 1.0 for a blackbody.
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Thermal barrier, английский
Thermal , electrical conductivity. conductor 1. a wire, cable, or device offering low resistance to the flow of electric current. 2. a material that transmits heat readily. 3.a downspout. 4. any vertical pipe which conveys rainwater, including one within, английский
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