作者Lou0103 (lou)
看板ChemEng
标题[材料] 一题材料热力学的题目
时间Tue Oct 18 15:26:38 2011
题目如下
A reversible heat engine, operating in a cycle, withdraws heat from a high-
temperature reservoir(the temperature of which consequently decrease), performs
work W, and rejects heat into a low-temperature reservoir(the temperature of
which consequently increases).The two reservoirs are, initially, at the
temperature T1 and T2 and have constant heat capacities C1 and C2,
respectively. Calculate the final temperature of the system and the maximum
amount of work which can be obtained from the engine.
我是有算出答案~但是我觉得这题目有点诡异~
请大家一起来讨论吧~
还有这题是Gaskell第3章的3.6题
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1F：→ lucifer19:118 10/18 16:14
2F：→ lucifer19:这题不诡异阿 简单来说就是 根据热力学第二定律 热机进 10/18 16:15
3F：→ lucifer19:行循环过程时 会由高温热库吸热 再放热给低温热库 所以 10/18 16:16
4F：→ lucifer19:到最後 低温热库及高温热库以及热机本身最後会到达热平 10/18 16:16
5F：→ lucifer19:衡 此时热机运转停止 在此之前热机所做的功即为最大功 10/18 16:17
6F：→ lucifer19:只要利用孤立系统火商增原理 把冷热库和热机本身视为同 10/18 16:19
7F：→ lucifer19:一个系统 又可逆时火商变化=0 分别计算冷热库的火商即可 10/18 16:20
8F：→ Lou0103:感谢 可是我在算Tf时 我的功要假设为0才算的出来 那又是 10/18 17:45
9F：→ Lou0103:怎麽回事 @.@" 10/18 17:45
10F：→ Lou0103:阿~我算出来了~我之前也是用类似的方法~虽然答案对 但是不 10/18 17:50
11F：→ Lou0103:符合题目所需 感谢大大~~ 10/18 17:50
12F：推 lucifer19:不用客气^^ 10/18 22:06