What is thermal resistance easy definition?

Thermal resistance is defined as the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area. Thermal resistance determines the heat insulation property of a textile material. The higher the thermal resistance, the lower is the heat loss.

What is thermal condition?

Thermal conditioning is the controlled application of heating and cooling to achieve a change in the mechanical properties of a material.

What is boundary condition in heat transfer?

Surface Boundary Conditions. Surface-based heat transfer boundary conditions represent either a known physical state, such as temperature, or an amount of heat entering or leaving the device, such as a heat flux. Temperature is the only condition that can be applied to openings and wall surfaces.

What is thermal factor?

A therm is a unit for measuring natural gas consumption and is used to calculate your gas charges. Atlanta Gas Light measures your consumption in CCFs, or hundreds of cubic feet of gas volume. The Thermal Factor is used to convert CCFs to therms.

What are thermal indices?

Thermal indices (also known as comfort indices) are criteria used for mathe- matical or nomographic determination of the combined effects of climatic factors – such as air temperature, humidity, air speed and radiation – from the viewpoint of body comfort.

What is U value and R-value?

R-Value is a measure of thermal resistance, or the ability of an object or material to resist the flow of heat. U-Value is a thermal transmittance, or the heat loss through a structural element.

What is insulation K-value?

Firstly, K-value indicates the ability of a material to conduct heat. Materials with low thermal conductivities do not easily allow heat energy to pass through. Normally, you would look for a material with a low K-value to insulate, as this will keep the cool inside your building.

What are thermal indices give 3 examples?

Three different thermal indices are identified: the soft-tissue thermal index (TIS), the bone thermal index (TIB), and the cranial-bone thermal index (TIC).

What is heat stress indices?

The heat stress index is defined as the relation of the amount of evaporation (or perspiration) required as related to the maximum ability of the average person to perspire (or evaporate fluids from the body in order to cool themselves).

What is boundary condition in physics?

Definition of boundary condition physics. : a condition which a quantity that varies throughout a given space or enclosure must fulfill at every point on the boundary of that space especially when the velocity of a fluid at any point on the wall of a rigid conduit is necessarily parallel to the wall.