Quick Answer
Unglazed collectors can work effectively in cold climates, but their efficiency is generally lower than glazed collectors due to heat loss.
Cold Climate Considerations
In cold climates, unglazed collectors typically require a larger surface area and a more robust heat exchange system to compensate for reduced efficiency. A common design involves using a large, shallow collector with a high flow rate to minimize heat loss and maximize heat collection. For example, a collector with a surface area of 100 sq. ft. and a water flow rate of 10 GPM can be effective in cold climates.
Design and Installation Techniques
When designing and installing unglazed collectors in cold climates, it’s essential to consider factors such as collector orientation, shading, and insulation. A south-facing collector orientation with minimal shading can help maximize energy collection. Additionally, using insulation to reduce heat loss from the collector and piping can improve overall efficiency. For example, using foam insulation on the collector pipes can reduce heat loss by 20-30%.
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