Residential Window To Wall Ratio

Touch a window versus a wall on a cold day you ll notice the glass is significantly colder.
Residential window to wall ratio. Why window to wall ratio is important in edge. Window area or window to wall ratio wwr is an important variable affecting energy performance in a building. A window to floor ratio provides a rough rule of thumb for determining optimum areas of window in relation to the floor area of a room or house. The analysis and optimization of wwr is an important way to achieve nearly zero energy consumption.
If you know the right proportion you can determine the size of your windows to maintain that ratio. The study analyzed the variation of. Windows are usually the weakest link when it comes to energy loss in a building. Chongqing shanghai and wuhan simulation models were built and analyzed using designer x2019 s simulation toolkit dest.
Typically glass conducts heat pretty well. First is to follow the requirements as outlined in the 2018 iecc prescriptive pathway. Exterior walls typically have u values of 0 5 2 5 w m2c. You may have to calculate a building s wall to window ratio to ascertain what additional insulation is required to meet your local building code.
Building codes vary between jurisdictions. In order to assess the optimal window wall ratio and the proper glazing type in different air conditioning system operation modes of residential buildings for each orientation in three typical cities in hot summer and cold winter zone. Adding a window to a room will change the proportion of windows on your home when viewed from the outside. Many state and local codes consider a building s wall to window ratio in determining its energy efficiency.
There are three options for the compliance pathway as part of the 2018 iecc. The proportion of windows to outside wall space will depend on your home s style and location as well as your personal preferences. Third we can elect to follow the 2018 iecc performance pathway. Window wall ratio wwr is one of the key energy saving design parameters affecting the energy consumption of nearly zero energy building nzeb in severe cold regions.
Second we can follow ashrae 90 1 2016.