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.
The South China tiger (Panthera tigris amoyensis) is a tiger population in the provinces of Fujian, Guangdong, Hunan, Jiangxi in southern China. It has been listed as Critically Endangered on the IUCN Red List since 1996, and is possibly extinct in the wild since no wild individual has been recorded since the early 1970s.