دانلود رایگان مقاله انگلیسی تحلیل عملکرد سیستم حرارتی فتوولتاییک با استفاده از فیلتر روغنی طیفی سیلیکونی - اشپرینگر 2018

Abstract

The paper reports use of silicone oil as spectrum filter and heat absorber for photovoltaic thermal systems. The terrestrial solar spectrum is in the wavelength range of 0.25 to 2.5 μm. The response range of C-Si solar cell is 0.75 to 1.125 μm. In the current study, the feasibility of Silicone oil (Transformer oil) as spectrum filter cum heat absorber for C-Si solar cell is investigated. The spectroscopic analysis of 1 cm thick Silicone oil sample with UV-VIS-NIR spectrophotometer is carried out. This analysis concludes that the Silicone oil is transparent to the response range of C-Si solar cell. Also, it shows a significant absorption for UV and IR part of the spectrum. A glass container with 1 cm thick Silicone oil layer is mounted on the C-Si PV module. The performance of the system is analyzed using solar simulator at irradiance of 1000 W/m2 , AM 1.5 G and in natural sunlight at Nagpur (21.10 N, 79.090 E). The experiments were performed for the entire year for time period of one hour in the noon. With Silicone oil spectrum filter, the average electrical efficiency of the PV module was found increase marginally. However, for 10 W module, 27 W average heat gain was recorded. In this study, the surface area of PV module (30 × 35 cm = 0.105 m2 ) was very small. In actual practice, for large scale installations, significant heat gain is possible. The experimentation and significant outcomes are discussed in this article.

CONCLUSIONS

In the current study, the performance of a photovoltaic thermal system using Silicone oil spectrum filter is analyzed with solar simulator and in natural sunlight. The Silicone oil is easily available, inexpensive and it is transparent for the response range of C-Si solar cell i.e. 0.75–1.125 μm wavelength of terrestrial solar spectrum. The spectrum filter improves the electrical performance of the PV module marginally. However, on an average 239 W/m2 of undesired part of solar spectrum is attenuated by 1 cm thick Silicone oil spectrum filter. This trapped heat can be used separately. In this study, the experiments were performed with a 10 W PV module with non concentrated radiations. It is strongly suggested to explore the feasibility of BSPVT system with concentrating radiations by flat reflecting mirrors. In such systems, the heat gain can be improved by extracting heat from the rear surface of the PV module.