Selection And Improvement Of SHGC & U-Value In Locations With Cold Winter And Warm Summer

Reports | May 25, 2018

The climate is changing in Canada, and this change is affecting homes and buildings, making it hard to decide how to select a proper SHGC for new windows or improve the current windows. The number of days with warm summer temperatures is increasing in Canada. For a city like Windsor, we expect more than 30 days above 35°C (95°F) in the summer, and winter gets as cold as -20°C (-4°F).

Higher solar heat gain can provide free winter heating in colder climates, but can lead to overheating and occupant discomfort in warm seasons and afternoons. Overheating is a very important issue in buildings because it has a direct effect on energy consumption, indoor comfort, and the aesthetic of the façade.

This paper considers several kinds of windows and glazing systems, different designs, orientation, shading conditions, and other devices to find an effective material and design to achieve an optimum solar heat gain for climates with a high temperature in summer and low temperature in winter.

The widely recognized NFRC 200 procedure (SHGC rating method) is used to determine the solar heat gain coefficient (SHGC) and visible transmittance of curtain-wall systems. THERM 7.4 2D, WINDOW 7.4, Resfen5, and EnergyGaugeUSA5 software are used to model the windows.

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