上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Engineering Thermodynamics I Lectures 5-6 Spring,2018 Prof.,Dr.Yonghua HUANG 强 MMLLLMMAA http://cc.sjtu.edu.cn/G2S/site/thermo.html AN 1日G
Engineering Thermodynamics I Lectures 5-6 Spring, 2018 Prof., Dr. Yonghua HUANG http://cc.sjtu.edu.cn/G2S/site/thermo.html
Chapter 2 Energy,Energy transfer and Analysis Objective Introduce energy concept. Organize the ideas about energy into forms suitable for engineering analysis. Energy can be stored within systems in various forms. Energy can be converted from one from to another. Energy can be transferred between systems. Total energy is conserved. 上游气通大粤 March 7,2018 2 SHANGHAI JIAO TONG UNIVERSITY
March 7, 2018 2 Chapter 2 Energy, Energy transfer and Analysis Objective • Introduce energy concept. • Organize the ideas about energy into forms suitable for engineering analysis. • Energy can be stored within systems in various forms. • Energy can be converted from one from to another. • Energy can be transferred between systems. • Total energy is conserved
Start with familiar examples Well-sealed and Well-sealed and well-insulated room well-insulated room Fan 洞日 What will happen to the average What if we operated a fan temperature of air in the room? in this room instead? 上游充通大 March 7,2018 3 SHANGHAI JLAO TONG UNIVERSITY
March 7, 2018 3 Start with familiar examples What will happen to the average temperature of air in the room? What if we operated a fan in this room instead?
Energy Exists in several forms:?? Thermal,mechanical,kinetic,potential,electric, magnetic,chemical,nuclear,.. © Total macroscopic energy microscopic energy 上游充通大学 March 7,2018 4 SHANGHAI JIAO TONG UNIVERSITY
March 7, 2018 4 Energy Exists in several forms: ??? • Thermal, mechanical, kinetic, potential, electric, magnetic, chemical, nuclear, … Total = macroscopic energy + microscopic energy
What about Macroscopic Energy? 上游充通大学 March 7,2018 5 SHANGHAI JIAO TONG UNIVERSITY
March 7, 2018 5 What about Macroscopic Energy?