第三章热力学第一定律 Chapter 3. The first law of thermodynamics 3.1系统的宏观和微观储存能 Macroscopic and microscopic energy of system 432热量、功量及质量引起的能量传递--传专递中的能量 Energy transfer by Heat, Work and Mass 43.3热力学第一定律与闭口系统的能量平衡方程 The first law of thermodynamics and Energy balance equation of closed system 43.4开口系统的能量平衡方程 Energy balance equation of open system 3.5稳态稳定流动的能量平衡 Energy balance for steady-flow systems 3.6工程中的几种稳态稳定流动装置 Some steady-flow engineering devices
第三章 热力学第一定律 Chapter 3. The first law of thermodynamics 3.1系统的宏观和微观储存能 Macroscopic and microscopic energy of system 3.2热量、功量及质量引起的能量传递------传递中的能量 Energy transfer by Heat, Work and Mass 3.3热力学第一定律与闭口系统的能量平衡方程 The first law of thermodynamics and Energy balance equation of closed system 3.4开口系统的能量平衡方程 Energy balance equation of open system 3.5稳态稳定流动的能量平衡 Energy balance for steady-flow systems 3.6工程中的几种稳态稳定流动装置 Some steady-flow engineering devices
热力学第一定律的本质 Essence of the first Law of Thermodynamics 本质:能量转换及守恒定律在热过程中的应用 ●18世纪初,工业革命,热效率只有1% 1842年,JR, Mayer闻述热一律,但没有 引起重视 1840-1849年, Joule用多种实验的一致性 证明热一律,于1850年发表并得到公认 1909年,C. Caratheodory最后完善热一律
热力学第一定律的本质 Essence of the First Law of Thermodynamics • 1909年,C. Caratheodory最后完善热一律 本质:能量转换及守恒定律在热过程中的应用 • 18世纪初,工业革命,热效率只有1% • 1842年,J.R. Mayer阐述热一律,但没有 引起重视 • 1840-1849年,Joule用多种实验的一致性 证明热一律,于1850年发表并得到公认
能量守恒定律 能量守恒定律阐明能量既不能被创造,也不能消灭, 它只能从一种形式转换成另一种形式,或从一个系统 转移到另一个系统,而其总量保持恒定 Conservation of energy principle states that energy can be neither created nor destroyed; it can only change from one form to another but the total amount off energy remains constant
能量守恒定律阐明能量既不能被创造,也不能消灭, 它只能从一种形式转换成另一种形式,或从一个系统 转移到另一个系统,而其总量保持恒定。 Conservation of energy principle states that energy can be neither created nor destroyed; it can only change from one form to another but the total amount of energy remains constant. 能量守恒定律
热力学第一定律 热力学第一定律主要说明热能与机械能在转换过 程中的能量守恒 The first law of thermodynamics is viewed as the Conservation of energy principle which governs the energy transfer process from thermal energy to mechanical ones
热力学第一定律主要说明热能与机械能在转换过 程中的能量守恒 The first law of thermodynamics is viewed as the Conservation of energy principle which governs the energy transfer process from thermal energy to mechanical ones. 热力学第一定律
系统能量的变化量等于加给的热量与系统对外所 作功量之差。 The change in energy of a system is equal to the difference between the heat added to the system and the work done by the system △E=Q-W “第一类永动机是不可能制成的” Perpetual-motion machine of the first kind
系统能量的变化量等于加给的热量与系统对外所 作功量之差。 The change in energy of a system is equal to the difference between the heat added to the system and the work done by the system. ⚫ ΔE = Q - W “第一类永动机是不可能制成的” Perpetual –motion machine of the first kind