Decrease of exergy principle The exergy of an isolated system during a process always decrease or, in the limiting case of a reversible process, remains constant In other words. it never increase and exergy is destroyed during an actual process 任何一孤立系,Bx只能不变或减少, 不能增加—孤立系Ex减原理Decrease of exergy principle The exergy of an isolated system during a process always decrease or, in the limiting case of a reversible process, remains constant 任何一孤立系， Ex只能不变或减少， 不能增加——孤立系Ex减原理 In other words, it never increase and exergy is destroyed during an actual process