Product Information / A Brief Discussion on the K Value of Building Photovoltaic Glass

A Brief Discussion on the K Value of Building Photovoltaic Glass

10-29-2024

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The K value (heat transfer coefficient) of building photovoltaic glass is an important thermal parameter that affects the energy efficiency and overall performance of buildings. However, the specific K value data may vary depending on the thickness of the glass, the type of hollow layer gas, emissivity, argon concentration, gas layer thickness, tilt angle, and manufacturing process.

 

The influence of glass thickness on K value

 

The definition of K value: K value (also known as thermal conductivity) is the thermal conductivity index of the material itself, measured in W/(m · K). It describes the heat flow rate per unit thickness of material at a unit temperature difference under steady-state heat conduction conditions.

 

The K value (heat transfer coefficient) of glass with different thicknesses will vary, mainly because the thermal conductivity of glass is related to its thickness. Generally speaking, the thicker the glass, the lower its K value, indicating better thermal insulation performance. The general rule of the relationship between glass thickness and K value is as follows:

 

As the thickness increases, the K value decreases: Thicker glass has a lower K value because it takes longer for heat to pass through thicker materials, thereby reducing the rate of heat transfer.

 

Thermal bridge effect: When the thickness of glass is uneven, thinner parts may become thermal bridges, leading to an overall increase in K value.

 

Material consistency: If the glass material is uniform, an increase in thickness will linearly decrease the K value, but in reality, due to manufacturing process and material non-uniformity, this relationship may not be completely linear.

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