Transient numerical model for the thermal performance of the solar receiver
Transient numerical model for the thermal performance of the solar receiver
复制标题
太阳能接收器热性能的瞬态数值模型
DOI：
10.1016/j.applthermaleng.2018.05.112
复制
发表时间：
2018-08
影响因子：
6.4
通讯作者：
Wang Zhifeng
中科院分区：
文献类型：
--
作者：
Xu Li;Stein Wesley;Kim Jin Soo;Too Yen Chean Soo;Guo Minghuan;Wang Zhifeng
瞬态热性能计算对于预测热功率输出和监测太阳能接收器的动态特性是必要的。因此，本研究描述了建立瞬态数值模型来对外部太阳能接收器的非稳态行为进行热分析。使用数值积分方法求解该模型，包括温度随时间的变化率以及接收管和传热流体 (HTF) 与温度相关的热物理特性。该瞬态模型可以研究不同边界条件下接收器和传热流体的温度分布如何从初始值演变。本研究的根本目的是展示接收器的瞬态性能，以便有利于旨在提高接收器效率而不对接收器本身造成风险的操作策略。因此，本研究重点关注考虑到太阳能接收器的热容量，导热流体的整体温度如何响应初始条件和边界条件。特别是，为了比较瞬态和稳态计算，本研究预测了不同运行模式或条件下的瞬态时间、对流热损失、辐射热损失和传热流体得热。因此，结果表明初始条件、接收管厚度、DNI水平和风速等重要影响因素如何影响太阳能接收器的瞬态热性能。此外，瞬态模型还具有调节传热流体流量的功能，以满足在集中太阳通量和风速等各种条件下接收器出口所需的传热流体温度。
Transient thermal performance calculations are necessary to predict the thermal power output and to monitor the dynamic characteristics of solar receivers. So this study described the establishment of a transient numerical model for the thermal analysis on unsteady behaviors of the external solar receiver. The numerical integration method was used to solve this model including the rate of the temperature change with time and the temperature-dependent thermophysical properties of the receiver tube as well as the heat transfer fluid (HTF). This transient model can investigate on how the temperature distributions of the receiver and the HTF evolve from the initial values under different boundary conditions. The fundamental aim of this study is to demonstrate the transient performance of the receiver in order to benefit the operation strategies which are supposed to improve the receiver efficiency without risk to the receiver itself. Therefore, this study focuses on how the bulk temperature of the HTF responds to the initial and boundary conditions in consideration of the thermal capacity of the solar receiver. Especially, for the comparison between the transient and steady-state calculations, this study predicted the transient time, the convective heat loss, the radiative heat loss and the HTF heat gain in different operation modes or conditions. Thus, the results show that how essential impact factors such as the initial condition, the thickness of the receiver tube, the DNI level and the wind speed affect the transient thermal performance of the solar receiver. Additionally, the transient model has the function of the adjustment of the flow rate of HTF in order to satisfy the required HTF temperature at the receiver outlet under the various conditions including the concentrated solar flux and the wind speed.
登录
查看更多内容
影响因子：
6.4
作者：
Z. Liao;A. Faghri
通讯作者：
Z. Liao;A. Faghri
DOI：
10.2172/6545992
发表时间：
1986-12
期刊：
--
影响因子：
--
作者：
P. K. Falcone
通讯作者：
P. K. Falcone
影响因子：
11.2
作者：
Xiaoping Yang;Xiao-xi Yang;J. Ding;Y. Shao;H. Fan
通讯作者：
Xiaoping Yang;Xiao-xi Yang;J. Ding;Y. Shao;H. Fan
DOI：
10.2172/6906848
发表时间：
1984-04
期刊：
--
影响因子：
--
作者：
D. Siebers;J. S. Kraabel
通讯作者：
D. Siebers;J. S. Kraabel
影响因子：
11.2
作者：
K. Vignarooban;Xinhai Xu;A. Arvay;Keng Hsu;A. Kannan
通讯作者：
K. Vignarooban;Xinhai Xu;A. Arvay;Keng Hsu;A. Kannan