INSULATION DICTIONARY

Relative humidity: It is the ratio of the water vapor partial pressure in the air to the water vapor partial pressure in the saturated air at the same temperature.

Vapor Pressure: It is the partial pressure of water vapor in moist air. Humid air consists of water vapor and dry air. According to Dalton's law, P is the total pressure, PB is the partial pressure of water vapor, PH is the dry air pressure, and PD is the saturation pressure at the same temperature.

Steam Cutter: Are layers of extremely dense material that cut off the water vapor emitted within the building element. It is impossible to completely cut off water vapor. It is necessary to stop the water vapor in the hot parts of the building elements.

Dew Point: The condensation or saturation temperature for a given humidity of the air is called the dew point. Condensation occurs when the temperature in saturated air drops below the dew point. The dew point temperature is the point at which water vapor begins to condense.

Diffusion Resistance: It is a material constant that is not dependent on temperature in dry materials, and it has the effect of Moisture Bridge in materials with a certain moisture value.

Heat Conduction Resistance: It is the resistance of the surface to heat transfer when the temperature difference between the two faces of an object of thickness L is 1 °C. The unit is given as m² K/W.

Heat Conduction Coefficient: The heat transmission coefficient is the heat transfer rate transmitted for the temperature increase in unit thickness and its values ​​change according to the properties of the insulation materials. The heat transfer coefficient is denoted by the letter k. And its unit is W/mK.

Thermal Transmittance: When the temperature difference between the parallel surfaces of a building component is 1 °C, it is the amount of heat coming from the perpendicular direction to the surfaces in unit time, unit thickness and unit area, and its unit is W/m² K.

Thermal Permeability Resistance: It is the mathematical inverse of thermal conductivity. When the temperature difference between the two faces of an object of thickness L is 1 °C, it is the resistance of the unit surface to heat transfer and its unit is m² K/W.

Radiation Constant: It is the ratio of the radiation emitted from a surface to the 4th power of the absolute temperature.

Relative Diffusion Resistance:  p = S. µ.N.

Partial Diffusion Resistance: It is given as the product of the material thickness S and the diffusion resistance   r = S.µ

Absolute Humidity: It is the amount of moisture corresponding to the unit volume of humid air and is given by τ.

Specific Heat: It is the amount of heat required to raise the temperature of a unit mass by 1 °C. Its size is W/kgK or J/kgK and is denoted by Cp.

Specific Humidity: The ratio of the mass of water vapor to the mass of dry air is defined by X.

 

Shape Factor: The form factor is used to compare similar structures. It is denoted by F.

Convection Resistance: It is the resistance of the film layer surrounding the surface of the object to heat transfer and its unit is m² K/W.

Convection Coefficient: It is the amount of heat transferred from the fluid to the object or from the object to the fluid per unit time from the surface if the temperature difference is 1 °C. The convection coefficient depends on the surface geometry, the physical properties of the fluid, the temperature difference between the flow and the surface and the inlet conditions. The unit of average transport coefficient h used is W/m² K.

Sweating: Sweating is related to the dew point temperature and is the conversion of water vapor to water as a result of condensation on the face of the building elements.

Total Heat Transfer Coefficient: It is expressed as the amount of heat coming from the unit surface to the temperature increase, taking into account both the convection and conduction resistances. It is a measurement of the thermal conductivity between the total thicknesses of the construction under consideration. Its unit is W/m² K.

Condensation: It is the accumulation of water that cannot be noticed with the eye in the first formation that occurs on the inside of the building elements. If this accumulation of water does not dry out over time, it must be thrown out. Condensation should not exceed a certain limit in order to protect the building elements.