When you have two surfaces, each one emits radiant energy (according to its temperature level) towards the surroundings, and part of it is intercepted by the other. The relationship between the energy intercepted by one surface and the total emitted by the other.
Example: The conduction factor is related to the thermal resistance
en: Factor de forma de conducción
Convection resistance
Noun
Resistance to heat transport through fluid movement.
Example: The equation for the resistance to convection is as follows: Rconv=1/ha
en: Resistencia a la convección
Critical radius of insulation
Noun
is the measure of the radius of an insulator in which the heat transfer is maximum or the resistance of the heat flow is very low
Example: When placing an insulating material, it must be verified that its external radius is greater than the critical radius or that the critical radius is less.
en: Radio crítico de aislamiento
Cylinder conduction resistance
Noun
If the temperatures of the fluids, inside and outside the tube, remain constant, then the heat transfer through that tube is stationary. Therefore, the heat transfer through the tube can be considered stationary and one-dimensional.
Example: To know the conduction resistance of a cylinder, Fourier's law is used
en: Resistencia de conducción del cilindro
Efficiency
Noun
The thermal efficiency, ηth, of any heat engine is defined as the ratio of work to heat input. To calculate thermal efficiency, engineers often use enthalpy. Thermal engineering
Example: An Otto cycle gasoline engine has an efficiency of between 20 and 30%, at best. A diesel cycle diesel engine has an efficiency of between 30 and 45%, in the best of cases
en: Eficiencia
Fin efficiency
Noun
The efficiency of a fin is the relationship between the heat (Qf) that is transferred of a fin with given conditions, and the maximum heat transfer (Qmax) that would exist if that fin were at the maximum temperature (the temperature of base).
Example: Fins are known to be used to increase heat transfer from a source
because they increase the effective surface area,
en: Eficacia de la aleta
Interface resistance
Noun
is a measure of an interface's resistance to thermal flow. This thermal resistance differs from contact resistance (not to be confused with electrical contact resistance) because it exists even at atomically perfect interfaces.
Is the heat flux distributed on all the faces of the wall
Example: This relation can be extended to plane walls that consist of two or more layers by adding an additional resistance for each additional
layer.
en: Resistencia a la conducción de la pared plana
Radiation resistance
Noun
Radiation resistance is the act of manufacturing electronic components and systems that are resistant to damage or malfunction caused by ionizing radiation (high-energy electromagnetic and particulate radiation), such as those found in outer space, aircraft flights. high altitude, around nuclear reactors and particle accelerators or in nuclear accidents.
Example: Ecuación de la resistencia a la radiación: Rrad=1/(Hrad)(A)
en: Radiation resistance
Sphere conduction resistance
Noun
Resistance that opposes the flow of heat in the walls of the sphere.
Example: Stationary heat transfer through multiple cylindrical or spherical layers can be handled as in the case of multi-layer flat walls discussed earlier, simply by adding an additional resistance in series for each additional layer.
en: Resistencia a la conducción de la esfera
Surfaces
Noun
They are what help and allow to identify the different types of states and how they go from one state to another
Example: The surface of my television is flat.
en: Superficies
Thermal contact conductance
Noun
the ability to conduct heat, between two bodies in contact.
Example: The thermal contact conductance for aluminum plates with a surface roughness of 10 μm placed in air with an interface pressure of 1 atm is h c = 3640 W / m 2 .K
en: Conductancia de contacto térmico
Thermal contact resistance
Noun
In thermal engineering, the thermal contact conductance [W / m 2 .K] or the thermal contact resistance [m 2 .K / W] represents the heat conduction between two solid bodies
Example: Contact resistance is highly dependent on surface roughness
en: Resistencia de contacto térmico
Total thermal resistance
noun
Represents the ability of the material to oppose the flow of temperature. In the case of homogeneous materials, it is the ratio between the thickness and the thermal conductivity of the material; in inhomogeneous materials the resistance is the inverse of the thermal conductance.
Example: The thermal resistance concept can also be used to solve steady heat transfer problems involving parallel layers or combined
series-parallel arrangements.
