Which property of glass is a measure of solar heat gain?Group of answer choicesvisible transmittanceR-valueU-valueshading coefficient

To determine which property of glass measures solar heat gain, let's examine the options provided.

1. Visible Transmittance (Vt): This measures the fraction of visible light that passes through the glass. It does not directly relate to solar heat gain.

2. R-value: This represents the thermal resistance of a building material. Although it relates to heat transfer, it does not specifically measure solar heat gain.

3. U-value: This indicates the thermal transmittance of a building element, measuring how well the glass insulates. Again, it does not directly measure solar heat gain.

4. Shading Coefficient: This is the ratio of solar heat gain through the glass to the solar heat gain through standard glazing. It directly measures the ability of the glass to reduce solar heat gain.

Final Answer:

The property of glass that is a measure of solar heat gain is the shading coefficient.