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.
Tigernut milk (called Kunnu Aya in Nigeria and Horchata de Chufa in Spain) is naturally sweet, creamy and offers a luxurious, rich and nutty flavor.heyâre rich in minerals like calcium, iron, magnesium, potassium and phosphorus, as well as vitamins C and E. Theyâre a good source of oleic acid (a monounsaturated fat also found in olive oil, avocado and pork fat), and which is associated with increased HDL (good) cholesterol levels.