US: Deep winter greenhouse to be tested in Minnesota
The greenhouse is designed to help farmers grow fresh produce throughout the winter months. Deep winter greenhouses are passive solar, low-cost, low-carbon winter food production systems.
Producers using deep winter greenhouse technology are able to grow winter-hardy crops such as lettuces, cole crops and various sprouts with little or no added heat. The structure is built with a south-facing, angled glazing wall that captures heat from the sun.
Heat is stored in an underground rock bed and dissipates into the above-ground planting area at night. The university's prototype builds on earlier designs to increase insulation capacity and reduce electric use in the greenhouse.
Read more at the Brainerd Dispatch