太阳能烟囱发电系统非稳态传热问题及性能分析  

STUDY ON UNSTEADY HEAT TRANSFER AND PERFORMANCE ANALYSIS OF SOLAR CHIMNEY POWER GENERATION SYSTEM

作　　者：左潞[1,2] 郑源[1] 沙玉俊[3] 李振杰[1] 

机构地区：[1]河海大学能源与电气学院,南京210098 [2]河海大学可再生能源发电技术教育部工程研究中心,南京210098 [3]清华大学机械工程学院,北京100084

出　　处：《太阳能学报》2011年第6期868-874,共7页Acta Energiae Solaris Sinica

基　　金：河海大学自然科学基金(2007419611)

摘　　要：建立了包含蓄热层的太阳能烟囱发电系统非稳态传热数学模型,研究了集热系统特性和蓄热层的增温效应,结果表明:蓄热层表面温度、气流温度、集热棚板温度相互影响,随时间有较大波动;气流温升主要发生在气流入口至集热棚半径1/3处,蓄热层表面温度沿径向逐渐升高,在集热棚出口段有明显下降;集热棚板、蓄热层底部及四周是系统热量损失的主要地方;系统运行非稳定期,在没有太阳辐射时,深层蓄热层不参与向气流放热过程,而是继续从浅层蓄热层吸热,浅层蓄热层贮存的热量并不全向气流传递。系统运行平稳期,蓄热层底层的温度趋于定值;理论发电功率的变化趋势与气流温度随时间变化趋势一致。An unsteady-state heat transfer model of solar chimney power generation system with the heat storage layer was developed. The characteristic of heat collector and the temperature-improving effect of heat storage layer were studied. The results show that the effects of the surface temperature of heat storage layer, temperature of air flow and temperature of heat collector are interrelated and they have a larger fluctuations with time ; The increase of the temperature of air flow occurs mainly at one-third of distance from the air flow entrance to the heat collector radius ; The surface temperature of heat storage layer gradually increases along the radial direction, and decreases distinctly at outlet of the heat collector; The heat collector, the bottom of heat storage layer and its surrounding are the major places where heat loses. When the system is unstable, the underlying heat storage layer does not participate in the process of heat transfer to the air in the absence of solar irradiance, but continues to absorb the heat from the shallow heat storage layer, whose heat storage does not entirely pass to the air flow; When the system is stable, the temperature of the bottom of heat storage layer tends to the fixed value; The changing trend of theoretical power generation is in accordance with that of temperature of air flow with time.

关 键 词：太阳能烟囱 集热棚 蓄热层 空气涡轮机 

分 类 号：TK51[动力工程及工程热物理—热能工程]