If a bath window is glass block glazing with a total area of 15 square feet, what would the net winter heat loss be?

To determine the net winter heat loss through a glass block window, the calculation involves understanding the thermal properties of glass block glazing and utilizing the appropriate heat loss formulas.

Glass block windows typically have a U-factor, which represents the rate of heat transfer through the material. The U-factor for glass block is generally around 0.30 to 0.60 BTU/hr·ft²·°F, depending on the quality and construction of the glass blocks. To find the heat loss through the window, the formula used is:

Net Heat Loss (BTU/hr) = U-factor × Area × Temperature Difference

In this case, assuming a common U-factor of 0.30, and considering a winter temperature difference between the inside of a heated building (let's say 70°F) and the outside temperature (around 0°F), the temperature difference is 70°F. This leads us to:

Net Heat Loss = U-factor × Area × Temp Difference = 0.30 × 15 ft² × 70°F = 315 BTU/hr.

Considering the choices given, it’s likely that the thermal properties used vary based on the specifics of the glass block employed, construction conditions, or other factors that could lead to a