The Groundfridge is an autonomously operating and actively cooled cellar: an innovative version of the traditional root cellar for today’s sustainable companies and cosmopolitans with their own vegetable garden and who lead modern, self-providing lives. The Groundfridge uses the insulating capacity of the ground and the cooler night air temperatures. This allows the temperature within the Groundfridge to remain steady and cool throughout the entire year – the perfect temperature to store, for example, fruits, vegetables, wine and cheese.
The lightweight Groundfridge is very easy to transport and install and placing it doesn’t require any permits like a normal cellar would.
How does it work?
The Groundfridge is dug in and covered up with the soil that was taken from its new lodging place. This covering layer of soil is about 1 meter thick and has sufficient insulating properties for the core temperature within the Groundfridge to barely vary. It uses the cooling effect of the groundwater as well, if present.
Furthermore, there are two air currents. The first circulates and cools the air in the Groundfridge: the warm air in the top of the fridge is sucked out and blown down to the deepest point via a tube along the outside to cool it. This cooled air is blown into the Groundfridge again. This system is sufficient to circulate the entire air content every hour. A second fan is for ‘inhalation’: it obtains fresh air. By digital or analog programming the fan can inhale cooler air at night to actively cool the Groundfridge.
12 refrigerators, minimum electricity
The Groundfridge has a total volume of 7.85 m3: it is big enough to stand in – even with 2 people – and has a storage capacity of 3,000 liters. This equals the contents of 12 large family refrigerators that can store 500 kg of food.
On average, 12 refrigerators combined use 3,750 kWh per year, whereas the Groundfridge hardly uses any electricity at all – just 40 kWh per year for the ventilation.