Energy (Fenestration) [DN-15b]-DN-15b: Energy (Fenestration) Handout

DN-15b: Energy (Fenestration) Handout

Pdf Summary

This document provides information on energy conservation and condensation control in fenestration (windows). It explains the three main components of a window, which are the glazing, spacer, and frame. The glazing is typically glass but can also be other transparent or semitransparent materials. The spacer is used to create a space between the panes of glazing and can be filled with air, gas, or a combination. The type of gases used between the panes can affect the thermal performance of the window. The window frame material also plays a role in the window's performance, with wood and composite frames generally being more energy-efficient than metal frames.<br /><br />The document describes various types of window systems, such as awning, casement, double-hung, single-hung, skylights, storm windows, and transom windows, as well as curtain walls. It also discusses the importance of air barriers and vapor retarders in preventing air leakage and moisture problems with windows.<br /><br />The energy efficiency of windows is determined by their U-factor and solar heat gain coefficient (SHGC). Lower U-factors indicate better insulation, and lower SHGC values mean less heat gain. The document explains the importance of choosing windows with appropriate U-factors and SHGC values based on the climate zone.<br /><br />It also mentions other factors to consider when selecting windows, such as visible transmittance, air leakage rate, and condensation resistance. The document provides typical values for U-factors for various fenestration products.<br /><br />Lastly, the document emphasizes the importance of proper installation and maintenance of windows to prevent moisture problems, such as condensation and rainwater penetration. It also mentions design options for improving energy efficiency in different climate zones.<br /><br />Overall, this document provides a comprehensive overview of energy conservation and condensation control in fenestration and offers guidance for selecting and maintaining energy-efficient windows.

Keywords

energy conservation

condensation control

fenestration

glazing

spacer

frame

window systems

U-factor

solar heat gain coefficient

maintenance