A Refrigerator Mould is an open system that dispels heat from a closed space to a warmer area, usually a kitchen or another room. By dispelling the heat from this area, it decreases in temperature, allowing food and other items to remain at a cool temperature. Refrigerators appear to violate the Second Law of Thermodynamics, but the key reason they do not is because of the work needed as input to the system. They are essentially heat pumps but work to cool a region instead of heat it. http://www.meike-mould.com/home-appliance-mold/refrigerator-mould/