Mass entering or leaving the system System Mass exchange Surroundings Energy exchange Energy entering or leaving the system Energy can cross the boundary, in the form of heat and wor www.themegallery.com Company Logo
www.themegallery.com Company Logo System Surroundings Mass exchange Energy exchange Mass entering or leaving the system Energy entering or leaving the system Energy can cross the boundary, in the form of heat and work
热力系统选取的人为性: 过热器 Only work exchange (reheater) 汽轮机 turbine) 锅 炉 boiler 发电机 generator Work and heat exchange 凝汽得 (condenser 给水泵(pump) Only heat exchange www.themegallery.com Company Logo
www.themegallery.com Company Logo 热力系统选取的人为性： 锅 炉 boiler 汽轮机(turbine) 发电机(generator) 给水泵(pump) 凝汽器 (condenser) 过热器 (reheater) Only work exchange Only heat exchange Work and heat exchange
00 fixed、 movable real、 Imaginar 固定、活动 真实、虚构 www.themegallery.com Company Logo
www.themegallery.com Company Logo 固定、活动 真实、虚构 fixed 、 movable real 、 imaginary
00 3. Types of systems热力系统分类 (1)In terms of the interaction between system and its surroundings 依据系统和外界之间的相互作用 es No Mass open closed Heat non-adiabatic adiabatic Work with work without work Mass. heat or work non-isolated isolated www.themegallery.com Company Logo
www.themegallery.com Company Logo (1)In terms of the interaction between system and its surroundings 依据系统和外界之间的相互作用 Yes No Mass ? open closed Heat ? non-adiabatic adiabatic Work ? with work without work Mass, heat or work ? non-isolated isolated 3. Types of systems 热力系统分类
A Closed system and open system 闭口系统和开口系统 A Closed systen( a control mass控制质量) consists of a fixed amount of mass, and no mass can cross its boundary That is, no mass enters or leave a closed system 闭口系与外界无物质交换 such as Piston- cylinder device(汽缸-活塞装置) An Open system( or a control volume控制体积)isa roperly selected region in space. Both mass and energy, can cross the boundary of a control volume. 开口系写外界有物质交换 such as, A Water heater a turbine and a compressor etc www.themegallery.com Company Logo
www.themegallery.com Company Logo A Closed system (a control mass 控制质量) consists of a fixed amount of mass, and no mass can cross its boundary. That is, no mass enters or leave a closed system. 闭口系与外界无物质交换 such as, Piston-cylinder device (汽缸-活塞装置） An Open system (or a control volume 控制体积）is a properly selected region in space. Both mass and energy can cross the boundary of a control volume. 开口系与外界有物质交换 such as, A Water heater, a turbine and a compressor, etc A. Closed system and Open system 闭口系统和开口系统