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北京理工大学工程热力学课件.ppt

发布:2017-08-09约小于1千字共21页下载文档
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热工学 ( 1 ); 《工程热力学》 Engineering Thermodynamics;课程主要任务:;理论教学:(44学时);10. 湿空气(4学时);热力系统;(比热、潜热、热力学能、熵等);Major Viewpoints:Based on the General Laws of Thermodynamics, Requiring no Hypothesis about the Detailed Structure of Matter on the Atomic Scale;1.Basic Concepts, Definitions (基本概念及定义);EX.2: Refrigerator—Heat Energy Transferred from low Temperature to High Temperature Place;在上述两个例子中,热力学分析从什么地方开始进行?;由人为选定的边界所分割出来的一定空间或物质;闭口系统:;As shown in right Figure;若系统与外界之间有质量(物质)交换,这样的系统就叫开口系统;Adiabatic System;2)The values of all remaining properties can be determined from the values of the few used to specify the state. ;Equilibrium State: the System cannot change its State without an interaction with its Environment.;A Property is a characteristic of a system, and its Value is independent on the history of the system.;Specific Property (比状态参数—y=Y/m);Finally: Both systems change their state toward thermal equilibrium
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