Simulation and Analysis for Solar Thermal Applications with Various Irradiances

• Main Authors: Yan-Ming Huang, 黃彥銘
• Other Authors: Jiann-Lin Chen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/u48uv7

碩士 === 義守大學 === 機械與自動化工程學系 === 106 === The earth''s energy will eventually be exhausted. In the future, the world will face threats such as energy exhaustion, environmental pollution and warming. How to seek clean, environmentally friendly and efficient use of renewable energy, such as solar thermal energy, is one of the directions for us to move forward. However, the dust storm from China mainland and the local pollution have intensified the suspended particles in the air, resulting in the increasingly poor air quality in Taiwan, which also affects the irradiance of the sun on the earth surface. This study recorded the amount of falling dust in a specific area for 30 days in April, May, June and July of 2017. Dust-collecting glasses and a Fresnel lens to provide stable heat energy through an artificial light source were used. An illuminometer and thermocouples were adopted to measure the irradiance and temperature variations under different days. The irradiance decay rate on one dust-collecting glass reached 14.61% in May, and the irradiance decreased by 95.5W/m2 on average. In practical applications, we used the irradiance of the dust-falling experiment as the boundary conditions to numerically simulate the operation of the Stirling engine without movers. The simulated results show that the average temperature of the cylinder reaches 36˚C and the lowest is 26˚C. It also reveals that the temperature distributions of the transient 2D and 3D models are very similar. This study also used the overset mesh technology to carry out the simulations and analysis of the Stirling engine with the mover movements. It shows that under the conditions with/without the mover, the temperature distributions are similar, but the velocity vector distributions are obviously different. In the coming research, we recommend the overset mesh technology to simulate the operation of a Stirling engine in practical situations.