The average of all the instantaneous values of an alternating voltage and currents over one complete cycle is called Average Value. If we consider symmetrical waves like sinusoidal current or voltage waveform, the positive half cycle will be exactly equal to the negative half cycle.
Example: The results also show that the measured values, obtained using the spring loaded test rig, have considerable deviation from the AVERAGE VALUE
en: VALOR PROMEDIO
BOUNDARY CONDITIONS
PHRASE
Las condiciones de frontera (bc) son restricciones necesarias para la solución de un problema de valor de frontera. Un problema de valor en la frontera es una ecuación diferencial (o sistema de ecuaciones diferenciales) que debe resolverse en un dominio en cuya frontera se conoce un conjunto de condiciones.
Example: CONDITIONS OF CONDITIONS ALLOW US TO DIVIDE THE BOUNDARIES
en: CONDICIONES DE CONTORNO
CONVECTION
ADJECTIVE
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Example: CONVECTION IS A METHOD OF TRANSFERRING HEAT
en: CONVECCION
EMISSIVITY
ADJECTIVE
the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature
en: EMISIVIDAD
ENERGY BALANCE
PHRASE
An energy balance is an accounting of the contributions and energy consumption by a system to be studied. It is about knowing the changes in the energy level of a system.
Example: ENRGIA'S BALANCE SHEET HELPS US TO OBTAIN BALANCE BETWEEN EXPENSES AND
PROFITS
en: BALANCE DE ENERGIA
ESPECIFIED TEMPERATURE
PHRASE
the heat in calories required to raise the temperature of one gram of a substance one degree Celsius
Example: THE SPECIFIED TEMPERATURE IS IMPORTANT IN DIFFERENT CALCULATIONS
en: TEMPERATURA ESPECIFICADA
HEAT CONDUCTION EQUATION
PHRASE
It is a process of heat transmission based on direct contact between bodies, without matter exchange, because heat flows from a higher temperature body to a lower temperature body that is in contact with the former.
Example: THE HEAT TRANSFER EQUATION PROVIDES US WITH THE NECESSARY DATA FOR A BETTER RESULT
en: ECUACION DE TRANSFERENCIA DE CALOR
HEAT FLUX
PHRASE
Heat flux or thermal flux, sometimes also referred to as heat flux density[1], heat-flow density or heat flow rate intensity is a flow of energy per unit of area per unit of time. In SI its units are watts per square metre (W/m2). It has both a direction and a magnitude, and so it is a vector quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small.
Example: HEAT FLUX IS IMPORTANT FOR HEAT TRANSFER CALCULATIONS
en: FLUJO DE CALOR
INSULATION
ADJECTIVE
Isolation is used synonymously with refining or separating a compound from a mixture
Example: Roof systems reinforced concrete roof slabs pre-cast concrete roof systems Services Thermal INSULATION
en: ESPAÑOL
INTERNAL ENERGY
PHRASE
The internal energy of a thermodynamic system is the energy contained within it. It is the energy necessary to create or prepare the system in any given internal state. It does not include the kinetic energy of motion of the system as a whole, nor the potential energy of the system as a whole due to external force fields, including the energy of displacement of the surroundings of the system. It keeps account of the gains and losses of energy of the system that are due to changes in its internal state.[1][2] The internal energy is measured as a difference from a reference zero defined by a standard state. The difference is determined by thermodynamic processes that carry the system between the reference state and the current state of interest.
Example: INTERNAL ENERGY ALLOWS US TO LIMIT THE CAPACITIES OF DIFFERENT OBJECTS
en: ENERGIA INTERNA
NEGLIGIBLE
ADJECTIVE
so small or unimportant as to be not worth considering; insignificant
Example: The recorded results show correlation coefficients of NEGLIGIBLE 0.075 and 0.074, at least 0.35 is considered statistically significant.
en: DESPRECIABLE
PERFORMING
ADJECTIVE
to do an action or piece of work
Example: PERMFORMING A CALCULATION
en: EJECUTANDO
THERMAL CONDUCTIVITY
PHRASE
The thermal conductivity of a material is a measure of its ability to conduct heat..
Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. For instance, metals typically have high thermal conductivity and are very efficient at conducting heat, while the opposite is true for insulating materials like Styrofoam. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications, and materials of low thermal conductivity are used as thermal insulation. The reciprocal of thermal conductivity is called thermal resistivity.
Example: THERMAL CONDUCTIVITY GIVES US THE VALUE THAT CAN CONDUCT HEAT
en: CONDUCTIVIDAD TERMICA
THERMAL DIFFUSIVITY
PHRASE
Thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. High diffusivity means heat transfers rapidly.
Example: .Thermophysical properties : The THERMAL DIFFUSIVITY is the controlling factor.
en: DIFUSION TERMICA
THERMAL SYMMETRY
PHRASE
What is a thermal symmetry boundary condition? How is it expressed mathematically? A heat transfer problem that is symmetric about a plane, line, or point is said to have thermal symmetry about that plane, line, or point. The thermal symmetry boundary condition is a mathematical expression of this thermal symmetry.
