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sboswell1

Passive solar heating and window glazing

sboswell1
hace 9 años
Hi

We are in the process of designing an upstairs extension for our home in Australia. Our current windows which face North (the sunny side in Australia) are shaded in summer but let the beautiful warming sun in in winter. The glass in the old section of our house is regular clear glass. Our regulations (BASIX) are stipulating that we need single toned or low e glass in the new extension on both north and south facing windows. Obviously, in summer, the heat that comes from the sun is a problem but as we have no other forms of heating (we live in a temperate coastal location) we rely on the sun in winter. My question is does low e glass mean that the warming sun in winter is blocked out? I look forward to an answer.
Respuesta destacada
  • PRO
    SOLARIS
    hace 8 años

    I realize this post is a bit old but the earlier replies are incorrect. Low-e windows come in a wide variety of types with a range of performance options. Emissivity (the E in Low-E) is the measure of how efficient the item in question (windows) is at retaining thermal energy (heat). A lower emissivity means your window will retain more of the heat you have inside of your home by not letting it radiate through the window. This is completely separate from air sealing performance and the SHGC (Solar Heat Gain Coefficient - the measure of how much solar heat enters the window on sunny days).

    For cold climates with a passive solar design, a High SHGC/Low-E window gives you passive heat gain during the day and retains more of the heat during the night. Make sure you talk to an educated professional and know all of the performance of your new windows before committing to a purchase. We have seen hundreds of clients over the years overspend for windows that were not the right choice for their needs.

    You can also achieve similar performance with the addition of Low-E window films... Best of Luck!

    Comentarios (6)

    • PRO
      MrKapaluCanDesignToo
      hace 9 años
      Hi.

      From my knowledge, Low e glass only protects you the user from harmful infra red rays but still enjoy other properties of the glass such as transparency (light and heat seeping right through)
    • PRO
      Superior Windowland LLC
      hace 9 años
      It is true low-e glass will prevent you from getting some of the passive solar heat in winter, but will block that same unwanted heat in the summer
    • rodg
      hace 9 años
      We are in the last stages of our extension/reno in Northern Vic. Attached is a photo of our windows taken about 1st March (most likely mid afternoon).
      The usual double glazed windows have a slight tint - ours are darker. Window on left faces south, window is open (no screens yet) so the darker right hand side of the window shows the four thickness of glass. Windows on right face west and get the late afternoon and evening sun - windows are closed. Although we aren't back home living there yet, it always feels a good temperature when we are there - winter really hasn't hit yet.

      Second pic taken last Friday about 5pm - north facing window on the right.
    • sboswell1
      Autor original
      hace 9 años
      Thank you for your replys. They have all been helpful.
    • PRO
      Dizajn et cetera
      hace 9 años
      Última modificación: hace 9 años
      low e-glass is supposed to let the sun in during the lower temperatures in Winter and protect from the sun heat during higher temperatures during the Summer. The low e layer is located on the inner side of the inner glass of double or triple glazing window. In winter when the house is heated, this layer prevents hot air from exiting since it's reflected back from the layer. Meanwhile the heat from sunlight can enter inside.
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