工程热力学EngineeringThermodynamics.ppt
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1、工 程 热 力 学Engineering Thermodynamics,西安建筑科技大学环境与市政工程学院 School of Municipal&Environmental Engineering Xian University of Architecture&Technology,主 讲 人:赵 蕾 Zhao Lei Email:,教师介绍,赵 蕾,博士,副教授,硕士生导师 环境与市政工程学院,Address:环境与市政工程学院实验教学楼206室热工流力教研室Tel:82202185E-mail:,助教介绍,Name:Address:高层研究生公寓Tel:,Introduction(绪论)
2、,What does thermodynamics concern?Main Contents of Engineering ThermodynamicsSome Requirements for this course,Thermodynamics can be defined as a branch of science of energy.,heat,Therme,dynamis,power,(Greek words),热能,Thermal Energy,工程热力学是重要的技术基础课,0.1 What does thermodynamics concerns?(热力学涉及哪些内容?),T
3、hermodynamics is the branch of science which studies the rule that governs the transformation of thermal energy to other forms of energy.Also it studies how to use thermal energy efficiently.工程热力学是一门研究热能有效利用及热能和其它形式能量转换规律的科学 It includes all aspects of energy and energy transformations(能量转换),includin
4、g power generation,refrigeration and relationships among the properties of matter.,热电厂(热能机械能)Thermal Power Plant(Thermal Energy Mechanical Energy,飞机(热能机械能)Aeroplane(Thermal Energy Mechanical Energy,汽车(热能机械能)Vehicle(Thermal Energy Mechanical Energy),冰箱(机械能热能)Refrigerator(Mechanical Energy Thermal Ene
5、rgy,?Why do we need to learn Engineering Thermodynamics?,自然能源的种类(Categories of natural energy resources)A.化学能(Chemical energy):such as:煤炭(coal)石油(crude oil)天然气(natural gas)沼气(firedamp,etc).,2.自然界中的能源(Natural energy resources),B.机械能(Mechanical energy)such as:风力资源(wind resources)水力资源(water resources)潮
6、汐能(tidal energy),etc.C.热 能(Thermal energy)such as:太阳能(solar energy)地热能(geothermal energy),etc.D.原子能(Nuclear energy),Chemical energy Thermal energy,Fusion or fission reaction,Combustion(燃烧),directly used,Mechanical energy can be used directly.,(核聚变或和裂变),(2)能源的利用(Utilization of Energy Resources),Therm
7、al energy,Nuclear energy Thermal energy,indirectly used,能源转换与利用的关系(Relationship between energy transformation and utilization),热 能,电 能,机 械 能,风能,水能,化学能,核能,地热能,太阳能,一次能源(天然存在),二次能源,光电转换,燃料电池,光热,聚变,裂变,燃烧,水车,水轮机,风车,热机,电动机,发电机,90%,转换,直接利用,利用,生物质,90%of energy resources are transformed into thermal energy b
8、efore it is used.,(3)能量转换的共同点(A rule in common),Then,thermal energy is transformed into mechanical energy and used indirectly,How can thermal energy be transformed into mechanical energy more efficiently?,Thermal energy Mechanical energy(1)广泛性 universallyHeartthe heating and air-conditioning systems
9、,the refrigerator,humidifier,the pressure cooker,the water heater,the shower,the iron and even the computer.automotive engines,rockets,jet engines,and conventional and nuclear power plans,solar collector and the design of vehicles from ordinary cars to airplanes.,transformed,3.热力学的研究对象(What does The
10、rmodynamics study?),Disorganized energy organized energy(无序能)(有序能),transformed,(2)代表性(Representatively),(3)实用性(Practicality),4.能量转换的一些实例(Examples of Some energy transformation application),(1)火力发电装置(Steam power plant),火力发电装置基本特点,锅炉,汽轮机,发电机,给水泵,凝汽器,过热器,1、热源2、工质(水,蒸汽)3、工质状态的变化(加压、加热、膨胀做功、放热)4、冷源,Gener
11、alized Representation of Heat Engines(热机工作原理的示意),热 源(Hot Reservoir),冷 源(Cold Reservoir),How many W can be produced by absorbing QH?Is there any relationship between QH,QL and W?,Is QL necessarily to be discharged to its surroundings,becoming waste energy?,(2)内燃机装置Internal combustion engine,空气、油,废气,吸
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