Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Hong Kong → Investigating the effect of temperature differences and generated current on dust accumulation process on solar phtovoltaic (PV) modules

Hong Kong Polytechnic University (2018)

Investigating the effect of temperature differences and generated current on dust accumulation process on solar phtovoltaic (PV) modules

Jiang, Yu

Titre : Investigating the effect of temperature differences and generated current on dust accumulation process on solar phtovoltaic (PV) modules

Auteur : Jiang, Yu

Université de soutenance : Hong Kong Polytechnic University

Grade : Doctor of Philosophy (PhD) 2018

Résumé partiel
Solar Photovoltaic (PV) technology, can directly convert solar energy into utilized electricity with the help of photovoltaic effect by semi-conductor materials. Solar PV modules mainly contain solar cells that can convert receiving solar energy into electricity, glass covers to provide protection for vulnerable solar cell units and other electrical components to transform generated current meet the energy requirements of consumers. Many environmental parameters can greatly affect the energy conversion efficiency of solar PV modules, such as solar irradiance and temperature of solar cells. Additionally, another environmental parameter, dust accumulation, which means that airborne dust from the atmosphere air deposits on solar PV module covers due to different forces, is a significant issue when engineers considering the energy performance of solar PV modules because the accumulated dust can greatly reduce the received solar radiation and affect the energy conversion efficiency of solar PV modules. The formation of accumulated dust is inevitable because solar PV plants are generally located in areas where sunlight is not only abundant for energy conversion process but also has a high concentration of dust particles for dust accumulation. Based on previous studies all over the world, the effect of dust on solar PV modules is significantly negative due to the reduction in received solar irradiation by the refraction and extinction process of deposited dust particles. There are some researches on the dust accumulation on solar PV modules, but mainly focusing on the impact of dust density and property or environmental parameters such as wind and exposure time on the energy performance of solar PV modules without examining the impact of the operating solar PV modules on the dust accumulation process. During sunshine days, when the operating solar PV modules receives solar radiation and converts some irradiance into electricity with efficiency generally lower than 20%, the most received solar radiation will be converted into heat, which results in high temperature of solar cells, especially with high solar irradiance. This will cause obvious temperature difference between solar module surface and its surrounding air. In addition, the generated current by solar PV modules will cause electric field. Both the temperature difference between module surface and ambient air and the generated electric field will affect the particle deposition onto module surface. So, it is significant to study the effect of operational solar PV modules on the surface dust accumulation process. In addition, considering the greatly negative effect of dust accumulation on the energy conversion performance of solar PV modules, studies of approaches for removing or stopping dust accumulation thus have received lots of attention.

Présentation,

Version intégrale

Page publiée le 20 décembre 2022