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.
Characteristics. The Tigernut (cyperus sculentus lativum) or 'Chufa' as it is known in Spanish, is not actually a nut, but a small tuber. It was first discovered 4000 years ago and comes in several sizes.Tigernuts have long been recognised for their health benefits, as they are high in fibre, proteins, and natural sugars.he Tigernut (cyperus sculentus lativum) or 'Chufa' as it is known in Spanish, is not actually a nut, but a small tuber. It was first discovered 4000 years ago and comes in several sizes.