非均匀辐照对太阳能热电发电系统性能的影响

doi:10.1007/s11708-018-0533-7

Frontiers in Energy

2018, Vol. 12

Issue (2): 239-248 https://doi.org/10.1007/s11708-018-0533-7

本期目录

非均匀辐照对太阳能热电发电系统性能的影响

殷二帅¹, 李强¹(

), 宣益民^1,²

¹. 南京理工大学能源与动力工程学院，电子设备热控制工信部重点实验室，南京 210094，中国
². 南京航空航天大学能源与动力工程学院，南京 210016，中国

Effect of non-uniform illumination on performance of solar thermoelectric generators

Ershuai YIN¹, Qiang LI¹(

), Yimin XUAN²

¹. MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
². IMIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; School of Energy and Power, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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摘要:

太阳能热电发电系统（STEG）可以利用聚集的太阳光发电。由光学聚光器引起的太阳辐照分布的非均匀性可能会影响太阳能热电发电系统的性能。本文建立了太阳能热电发电系统的三维有限元模型，采用二维高斯分布模拟聚集到太阳能热电发电系统的太阳光的非均匀分布特性。在保持总入射太阳能不变的同时，研究了6种具有不同非均匀度的太阳辐照分布，讨论了非均匀太阳辐照分布对太阳能热电发电系统温度分布、电压分布和最大输出功率的影响。还比较了具有32、18和8对热电引脚的三种不同热电发电器件在非均匀太阳辐照分布下的性能。结果表明：太阳辐照的非均匀度对太阳能热电发电系统的温度分布和电压分布影响很大；与边缘区域热电引脚相比，中间区域的热电引脚有着更大的温差和产生更大的电压；不均匀的太阳辐照分布会削弱太阳能热电发电系统的性能，在本文研究的不均匀性范围内系统最大输出功率下降了1.4%；此外，减少用于非均匀太阳辐照分布下的热电发电器件的引脚数量可以极大的提高太阳能热电发电系统的性能。

Abstract：

Solar thermoelectric generators (STEGs) are heat engines which can generate electricity from concentrated sunlight. The non-uniform illumination caused by the optical concentrator may affect the performance of solar thermoelectric generators. In this paper, a three-dimensional finite element model of solar thermoelectric generators is established. The two-dimensional Gaussian distribution is employed to modify the illumination profiles incident on the thermoelectric generator. Six non-uniformities of solar illumination are investigated while keeping the total energy constant. The influences of non-uniform illumination on the temperature distribution, the voltage distribution, and the maximum output power are respectively discussed. Three thermoelectric generators with 32, 18 and 8 pairs of thermocouples are compared to investigate their capability under non-uniform solar radiation. The result shows that the non-uniformity of the solar illumination has a great effect on the temperature distribution and the voltage distribution. Central thermoelectric legs can achieve a larger temperature difference and generate a larger voltage than peripheral ones. The non-uniform solar illumination will weaken the capability of the TE generator, and the maximum output power decrease by 1.4% among the range of non-uniformity studied in this paper. Reducing the number of the thermoelectric legs for non-uniform solar illumination can greatly increase the performance of the thermoelectric generator.

Key words： solar thermoelectric generators non-uniform solar illumination performance evaluation solar energy

收稿日期: 2017-05-24 出版日期: 2018-06-04

通讯作者: 李强 E-mail: liqiang@njust.edu.cn

Corresponding Author(s): Qiang LI

引用本文:

殷二帅, 李强, 宣益民. 非均匀辐照对太阳能热电发电系统性能的影响[J]. Frontiers in Energy, 2018, 12(2): 239-248.
Ershuai YIN, Qiang LI, Yimin XUAN. Effect of non-uniform illumination on performance of solar thermoelectric generators. Front. Energy, 2018, 12(2): 239-248.

链接本文:

https://academic.hep.com.cn/fie/CN/10.1007/s11708-018-0533-7
https://academic.hep.com.cn/fie/CN/Y2018/V12/I2/239

Fig.1

Fig.2

Fig.3

Fig.4

Tab.1

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

C_P	Specific heat capacity/(J?(kg?K)^-¹)
T	Temperature/K
t	Time/s
$q →$	Heat flux vector/(W?m^-²)
$q ˙$	Heat generation rate/(W?m^-³)
$∇$	Hamiltonian
s	Seebeck coefficient/(V?K)
k	Thermal conductivity/(W?(m?K)^-¹)
$J →$	Electric current density vector/(A?m^-²)
$E →$	Electric field intensity vector/(V?m^-¹)
$D →$	Electric fluxdensity vector/(A?m^-²)
Z	Figure of merit of TE generator
G	Solar radiation density/(W?m^-²)
D²	Variance of Gaussian distribution
G₀	Density of uniform radiation/(W?m^-²)
A_s	Area of selective absorber/m²
Q	Heat flux density/(W?m^-²)
P	Output power of TE generator/W
V	Voltage/V
r	Resistance/W
r	Density/(kg?m^-³)
s	Electrical conductivity/(S?m^-¹)
j	Electric scalar potential/V
p	Eircumference ratio
w	Normalization factor
t	Transmittance of the glass
a	Absorptance of the solar selective absorber
e	Emissivity of selective absorber
e	External resistance
oc	Open circuit voltage
max	Maximum output power of TE generator
TE	Thermoelectric generator

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