Heat transfer always occurs from a region of high temperature to another region of lower temperature. Heat transfer changes the internal energy of both systems involved according to the First Law of Thermodynamics.
Cyperus esculentus (also called chufa sedge, nut grass, yellow nutsedge, tiger nut sedge, or earth almond) is a crop of the sedge family widespread across much of the world.It is native to most of the Western Hemisphere as well as southern Europe, Africa, Madagascar, the Middle East and the Indian Subcontinent.n Spain, C. esculentus is cultivated for its edible tubers, called earth almonds or tiger nuts, for the preparation of  horchata de chufa, a sweet, milk-like beverage. However, in most other countries, C. esculentus is considered a weed.
Santalum Acuminatum or the Quandong. The Quandong is a truly unique native Australian fruit. Found in the arid and semi-arid regions of all Australian mainland states, Quandong trees have been classified as belonging to the santalum genus of plants.Ideally adapted to arid environments, the Santalum Acuminatum species is known to be a semi-parasitic plant.ustralian people often refer to Quandongs as the Wild Peach, Desert Peach or Native Peach. Quandongs have a vitamin C content higher than oranges and and almost certainly saved many early Australian explorers from scurvy. Quandong fruit can be dried and frozen for 8 years or more, without losing any flavour whatsoever.