面向热伏发电系统的紧凑式换热结构设计及性能分析
Analysis and Design of Compact Heat Exchanger for a Thermo-voltaic Power Generation System
作者：鞠铖(四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065)；谢和平(四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065;深圳大学 深地科学与绿色能源研究院 土木与交通工程学院, 广东 深圳 518052)；孙立成(四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065)；唐继国(四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065)；莫政宇(四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065)；李碧雄(四川大学 深地科学与工程教育部重点实验室, 四川 成都 610065)
Author：JU Cheng(State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China)；XIE Heping(State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;Inst. of Deep Earth Sci. and Green Energy, College of Civil and Transportation Eng., Shenzhen Univ., Shenzhen 518052, China)；SUN Licheng(State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China)；TANG Jiguo(State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China)；MO Zhengyu(State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China)；LI Bixiong(Key Lab. of Deep Underground Sci. and Eng. for Ministry of Education, Sichuan Univ., Chengdu 610065, China)
收稿日期：2019-10-17 年卷（期）页码：2019,51(6):54-59
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：地热发电;热电转换;自相似微通道热沉;换热结构
Key words：geothermal heat;thermo-electric conversion;self-similarity microchannel sink;heat exchanger structure
基金项目：国家自然科学基金项目（51706149；51709191）；四川省科技计划资助项目（2019YJ0053）
中文摘要
中低温地热温差材料热伏发电是世界性研究热点，其难点是如何提高热伏发电的热电转换效率。本文提出一种基于自相似结构（SSHS）的换热结构设计方案，可以大大减小一般热电转换系统换热结构的体积与重量，同时提高热电转换效率。以一个热端热沉的流动换热过程为例，利用数值计算方法对其换热和流动阻力特性进行了模拟和分析，并与两种传统换热结构进行了对比。计算结果表明：SSHS热沉具有更强的换热能力，换热均匀性更好，流量范围0.010 3～0.018 6 kg/s、热流密度2 W/cm2及进口热水温度100 ℃条件下，SSHS热沉的换热能力可达一般换热结构的2倍以上，换热面（释热面）温度高出5～10 K，温度分布均匀性提高了50%以上，进而有利于提高热电转换效率；此外，SSHS虽然相较传统结构有更大的流动阻力，但对于当前设计总流动阻力也不超过450 Pa，因此SSHS热沉非常适合用于模块化的热电直接转换系统。
英文摘要
Middle and low temperature geothermal power generation by thermoelectric materials receives increasingly attention, while the key difficulty involved is how to increase the thermoelectric conversion efficiency. This paper presents a conceptual design of heat exchanger on the basis of a Self-Similarity microchannel Heat Sink (SSHS) which can reduce the volume and weight of the system to a great extent and increase the thermo-electric conversion efficiency. With a heat exchanger of the hot side as an example, its heat transfer and flow resistance characteristics were numerically evaluated and compared with two traditional heat exchange structures. The calculation results indicate that the current design of SSHS has a better performance and uniformity in heat transfer. Under conditions of flow rates of 0.0103～0.0186 kg/s, heat flux of 2 W/cm2and entrance water temperature of 100 ℃, its heat transfer ability is over twice of that of a conventional heat exchanger, and average temperature of the heat release surface is raised by 5～10 K, and uniformity in temperature distribution is increased over 50%. As a consequence, an improved thermoelectric conversion efficiency is obtained, although a larger flow resistance is hard to avoid. For the current design the total pressure drop is no more than 450 Pa, it is still very suitable for a direct thermo-electric conversion system.
下一条：摩擦部分自复位连接组合框架层间抗震修复性试验研究
【关闭】
