Quick Answer
A solar air heater can be a good option for a root cellar, providing a free and renewable source of heat during the winter months. Installation can be relatively straightforward, but careful consideration should be given to the design and placement of the heater.
Planning and Design
When planning a solar air heater for your root cellar, consider the size of the space and the amount of heat it requires. A general rule of thumb is to estimate 10-20 square feet of collector area per 100 square feet of heated space. In this case, if your root cellar is 200 square feet, you would need a collector area of 20-40 square feet.
Collector Orientation and Placement
The collector should face south at an angle between 30-60 degrees to maximize solar radiation. It’s also essential to ensure the collector is at least 6 inches away from any obstructions, such as walls or adjacent structures, to allow for proper airflow. A common configuration is to place the collector on the roof of the root cellar, just above the peak of the building.
System Components and Installation
The solar air heater typically consists of a collector, a fan, and a duct system. The collector is usually a black-painted metal or plastic panel with a transparent glazing material, such as fiberglass or acrylic. The fan is usually a low-wattage unit, around 20-50 watts, and is connected to the collector via a duct system. During installation, ensure that the duct system is properly insulated and sealed to minimize heat loss and prevent cold air infiltration.
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