Influence of Dust Accumulation on the Solar Reflectivity of a Linear Fresnel Reflector
- PDF / 3,303,491 Bytes
- 15 Pages / 595.22 x 842 pts (A4) Page_size
- 51 Downloads / 181 Views
https://doi.org/10.1007/s11630-020-1379-y
Article ID: 1003-2169(2020)00-0000-00
Influence of Dust Accumulation on the Solar Reflectivity of a Linear Fresnel Reflector ZHAO Xiaoyan1, CHEN Zhuang1, YAN Suying1*, MING Tingzhen2, WU Ze1, MA Rui1 1. College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Solar reflecting and heat collecting systems are generally operated outdoors year-round, and the optical performance of the reflector is reduced by dust accumulation on the surface. In this study, the dust accumulation on a linear Fresnel reflector was investigated. The relative reflectivity of the mirror before and after dust accumulation and the physical and chemical characteristics of the dust were measured using an ultraviolet spectrophotometer, scanning electron microscope, and X-ray diffractometer. The results showed that the dust density on the mirror increased, and the relative reflectivity decreased with an increase in the dust accumulation time. During 48 days of dust accumulation, the average relative reflectivity decreased 9.4% for a 1 g/m2 increase in the dust density. Additionally, the dust density on the mirror increased while the relative reflectivity decreased with a decrease in the mirror tilt angle. The rate of decrease of the relative reflectivity was higher for the aluminum mirror than that of the silver mirror after dust accumulation. The main component of the dust particles in the test area was SiO2, and the particle size range of the dust was 0.9 μm to 87 μm. According to the physical and chemical properties of the dust and the shielding effect of the dust on the mirror, a model to predict the influence of natural dust accumulation on the relative reflectivity of the linear Fresnel reflector was proposed. The predicted results deviated about 1% from the test results.
Keywords: solar energy, linear fresnel reflector, dust accumulation, prediction
1. Introduction With the increasing demand for energy in different industry sectors, environmental problems and the energy crisis have a negative impact on the long-term stable development of human society. Therefore, renewable energy plays an important role in the energy supply in many countries [1, 2]. Solar energy is a relatively new energy source to solve energy shortages and climate change-related problems due to its advantages of wide availability, low environmental impact, and large Received: May 15, 2020
AE: SUN Jie
reserves [3, 4]. Concentrating solar power (CSP) and photovoltaic (PV) systems are key technologies of solar energy utilization [5]. The solar concentrating mirror is the core component of a CSP system; it reflects and focuses solar energy and converts solar energy into thermal energy [6]. The linear Fresnel reflector (LFR) system is a solar energy conce
Data Loading...
