Describir: Heat transfer :

  _____     _____     _  _      ___      ______     ___      _____      ___    
 / ____||  |  ___||  | \| ||   / _ \\   /_   _//   / _ \\   / ____||   / _ \\  
/ //---`'  | ||__    |  ' ||  / //\ \\    | ||    | / \ || / //---`'  | / \ || 
\ \\___    | ||__    | .  || |  ___  ||  _| ||    | \_/ || \ \\___    | \_/ || 
 \_____||  |_____||  |_|\_|| |_||  |_|| /__//      \___//   \_____||   \___//  
  `----`   `-----`   `-` -`  `-`   `-`  `--`       `---`     `----`    `---`