The heat transfer from one surface (at a temperature T1) to the other surface (at T2) can be expressed as: q=Sk(T1-T2) where k is the thermal conductivity of the solid and S is the conduction shape factor.
Example: Heat from the sun warming your face.
es: Conduction shape factor
Convection resistance
Noun
The convection resistance per unit area is the inverse of the convection heat transfer coefficient.
Example: The thermal resistance is defined as the ratio of the temperature difference, dT, to the heat transfer Q.
es: Resistencia a la convección
Critical radius of insulation
Noun
The critical radius of insulation is a counterintuitive concept within the study of heat transfer.
Example: The critical radius of insulation is a counterintuitive concept within the study of heat transfer
es: Radio crítico de aislamiento
Cylinder conduction resistance
Noun
Consider steady heat conduction through a hot water pipe. Heat is continuously lost to the outdoors through the wall of the pipe, and we intuitively feel that heat transfer through the pipe is in the normal direction to the pipe surface and no significant heat transfer takes place in the pipe in other directions
Example: Hot water pipe
es: Resistencia de conducción del cilindro
Efficiency
Noun
Efficiency is the fundamental reduction in the amount of wasted resources that are used to produce a given number of goods or services (output)
Example: if 200 J is put into the engine, and observe 120 J of waste heat, then 80 J of work must have been done, giving 40% efficiency.
es: Eficiencia
Fin effectiveness
Noun
The fin temperature effectiveness or fin efficiency is defined as the ratio of the actual heat transfer rate through the fin base divided by the maximum possible heat transfer rate through the fin base, which can be obtained if the entire fin is at base temperature
Example: he ratio of heat transfer from the fin to the heat transfer if the fin wasn't existing. In other words, this quantity tells us how much extra heat is being transferred by the fin.
es: Eficacia de la aleta
Fin efficiency
Noun
Fin efficiency is defined as the ratio of actual heat flow of the fin to that which would be obtained with a fin of constant temperature uniformly equal to the base surface temperature, that is, one with infinite thermal conductivity.
Example: Therefore, heat fins are more effective if h is low. Observation: If fins are to be used on surfaces separating gas and liquid. Fins are usually placed on the gas side.
es: Eficiencia de la aleta
Interface resistance
Noun
Interfacial thermal resistance, also known as thermal boundary resistance, or Kapitza resistance, is a measure of an interface's resistance to thermal flow.
Example: will be used to calculate thefollowing values: m1 = 0.139, m2 =0.0865, respectively. The effective surface slope of the interface is thereforem = 0.164.
es: Resistencia de interfaz
Plane wall conduction resistance
Noun
HEAT CONDUCTION THROUGH A PLANE WALL • Let us consider a plane wall of homogeneous material through which heat is flowing in x-direction. • Let Q +x L = thickness of the wall T0 A = cross-sectional area of the wall k k = thermal conductivity of wall material T1 T0 , T1 = temperature maintained at surfaces 1 and 2.
Example: HEAT CONDUCTION THROUGH A PLANE WALL • Let us consider a plane wall of homogeneous material through which heat is flowing in x-direction. • Let Q +x L = thickness of the wall T0 A = cross-sectional area of the wall k k = thermal conductivity of wall material T1 T0 , T1 = temperature maintained at surfaces 1 and 2.
es: Resistencia de conducción de la pared plana
Radiation resistance
Noun
The component of antenna resistance that accounts for the power radiated into space and is equal in ohms to the radiated power in watts divided by the square of the effective current in amperes at the point of power supply
Example: The radiation resistance is determined by the geometry of the antenna and the operating frequency.
es: Resistencia a la radiación
Sphere conduction resistance
Noun
Consider steady heat conduction through a spherical layer. Heat is continuously lost to the outdoors through the wall of the pipe, and we intuitively feel that heat transfer through the pipe is in the normal direction to the pipe surface and no significant heat transfer takes place in the pipe in other directions
Example: Spherical layer
es: Resistencia a la conducción de la esfera
Surfaces
Noun
the outer face, outside, or exterior boundary of a thing; outermost or uppermost layer or area.
Example: An example of surface is the hardwood covering of a table
es: Superficie
Thermal contact conductance
Noun
In heat transfer and thermodynamics, a thermodynamic system is said to be in thermal contact with another system if it can exchange energy through the process of heat. Perfect thermal isolation is an idealization as real systems are always in thermal contact with their environment to some extent.
Example: he thermal contact conductance for aluminum plates with a surface roughness of 10 μm placed in air with the interface pressure of 1 atm is hc = 3640 W/m2.
es: Conductancia de contacto térmico
Thermal contact resistance
noun
Thermal contact resistance is defined as the ratio between this temperature drop and the average heat flow across the interface.
Example: Thermal contact resistance is always present in the interface between two solid surfaces. In this example, we look at contact resistance between layers in a stack of copper sheets and its impact on the apparent thermal conductivity across the layers. Interfaces slow the propagation of heat in a structure.
es: Resistencia al contacto térmico
Total thermal resistance
Noun
Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. Thermal resistance is the reciprocal of thermal conductance.
Example: An example of this is a cavity-brick wall, with two layers of brick, an air gap and 12mm of plasterboard - all in series.
