Quick Answer
To integrate passive solar in colder climates, orient your home's south-facing glazing to collect winter sun, use thermal mass to absorb and release heat, and design overhangs to block summer sun. Consider a south-facing slope of at least 15 degrees for optimal solar gain. Proper insulation and air sealing are also crucial for minimizing heat loss.
Understanding Passive Solar Orientation
When designing a passive solar home in a colder climate, the first consideration is orientation. To maximize winter solar gain, your home should face within 15-30 degrees of true south. This allows the sun’s rays to enter the home at a shallow angle, providing warmth throughout the day. Aim for a south-facing slope of at least 15 degrees to ensure optimal solar gain.
Designing with Thermal Mass
Thermal mass materials such as concrete, brick, or tile can absorb heat from the sun during the day and release it at night, reducing the need for artificial heating. To incorporate thermal mass effectively, place it on the south-facing wall or floor, where it can absorb solar radiation. Aim for a minimum of 10% thermal mass coverage on the south-facing wall to achieve significant heat gain.
Overhangs and Shading
To prevent summer sun from overheating your home, design overhangs that cast shade on the south-facing windows during the hottest months. A general rule of thumb is to design an overhang that extends at least 7 feet beyond the window, with the overhang’s edge pointing towards the south. This will cast shade during the summer solstice and allow winter sun to enter the home.
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