Walipini also known as underground greenhouse gases or hole in the ground an upward effect of thermal performance is provided so that the lower parts are not from freezing in winter .
This effect can be called as thermal friction. This analogy is particularly applicable because
that the upper portion of the soil around the greenhouse will be affected by the first
cold winter , but after months of cold or heat friction , the lower part display a slow thermal reduction .
When the ground (earth , stone, water - dense matter ) comes into contact with sunlight
absorbs and stores heat. By absorbing heat , the walls of the semi-subterranean heat load environments such as batteries of electric charge. The heat storage in the soil mass is known as the " Wheel Effect" , to load the wheel during the day ( storing heat / energy) and rotating down or discharged in the evening. When the heat / energy flows from the walls of the environment , to outside the greenhouse through the plastic goes to the cold night air . The amount of heat stored in the earth walls , is a critical factor in maintaining crops so they do not burn or freeze during the coldest winter days.
