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.
Queensland's Department of Primary Industry is investigating the food potential-and ultimately the commercial value-of nuts on two rainforest trees found along the State's coastline.The nuts from the trees Athertonia diversifolia and Elaeocarpus bancroftii have always been valued as food items by Aboriginals.s tropical rainforest is so rich in plant species, it is not surprising that among them are some that could be developed as food plants. (This is in addition to the valuable timbers and other products, such as rubber, that come from the world's stock of rainforest trees.).