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Effects On Amorphous Silicon Photovoltaic Performance From High-Temperature Annealing Pulses In Photovoltaic Thermal Hybrid Devices, M. Pathak, Joshua M. Pearce, S. J. Harrison
Effects On Amorphous Silicon Photovoltaic Performance From High-Temperature Annealing Pulses In Photovoltaic Thermal Hybrid Devices, M. Pathak, Joshua M. Pearce, S. J. Harrison
Joshua M. Pearce
There is a renewed interest in photovoltaic solar thermal (PVT) hybrid systems, which harvest solar energy for heat and electricity. Typically, a main focus of a PVT system is to cool the photovoltaic (PV) cells to improve the electrical performance; however, this causes the thermal component to under-perform compared to a solar thermal collector. The low temperature coefficients of amorphous silicon (a-Si:H) allow the PV cells to be operated at high temperatures, which are a potential candidate for a more symbiotic PVT system. The fundamental challenge of a-Si:H PV is light-induced degradation known as the Staebler–Wronski effect (SWE). Fortunately, SWE …
Optimizing Limited Solar Roof Access By Exergy Analysis Of Solar Thermal, Photovotaic, And Hybrid Thermal Systems, M. Pathak, P. G. Sanders, Joshua M. Pearce
Optimizing Limited Solar Roof Access By Exergy Analysis Of Solar Thermal, Photovotaic, And Hybrid Thermal Systems, M. Pathak, P. G. Sanders, Joshua M. Pearce
Joshua M. Pearce
An exergy analysis was performed to compare a conventional (1) two panel photovoltaic solar thermal hybrid (PVT x2) system, (2) side by side photovoltaic and thermal (PV + T) system, (3) two module photovoltaic (PV) system and (4) a two panel solar thermal (T x2) system with identical absorber areas to determine the superior technical solar energy systems for applications with a limited roof area. Three locations, Detroit, Denver and Phoenix, were simulated due to their differences in average monthly temperature and solar flux. The exergy analysis results show that PVT systems outperform the PV + T systems by 69% …
The Effect Of Hybrid Photovoltaic Thermal Device Operating Conditions On Intrinsic Layer Thickness Optimization Of Hydrogenated Amorphous Silicon Solar Cells, M. Pathak, K. Girotra, S. J. Harrison, Joshua M. Pearce
The Effect Of Hybrid Photovoltaic Thermal Device Operating Conditions On Intrinsic Layer Thickness Optimization Of Hydrogenated Amorphous Silicon Solar Cells, M. Pathak, K. Girotra, S. J. Harrison, Joshua M. Pearce
Joshua M. Pearce
Historically, the design of hybrid solar photovoltaic thermal (PVT) systems has focused on cooling crystalline silicon (c-Si)-based photovoltaic (PV) devices to avoid temperature-related losses. This approach neglects the associated performance losses in the thermal system and leads to a decrease in the overall exergy of the system. Consequently, this paper explores the use of hydrogenated amorphous silicon (a-Si:H) as an absorber material for PVT in an effort to maintain higher and more favorable operating temperatures for the thermal system. Amorphous silicon not only has a smaller temperature coefficient than c-Si, but also can display improved PV performance over extended periods …
Optimization Of Annealing Cycles For Electric Output In Outdoor Conditions For Amorphous Silicon Photovoltaic - Thermal Systems, Joseph Rozario, Joshua M. Pearce
Optimization Of Annealing Cycles For Electric Output In Outdoor Conditions For Amorphous Silicon Photovoltaic - Thermal Systems, Joseph Rozario, Joshua M. Pearce
Joshua M. Pearce
Previous studies with fixed operating temperatures have shown that hydrogenated amorphous silicon (a-Si:H) was a promising absorber layer for solar photovoltaic–thermal (PVT) systems because of (a) a low temperature coefficient and (b) the opportunity to reverse light induced degradation with thermal annealing. This study further refined the simulation of the optimal dispatch strategy for a-Si:H based PVT by studying annealing cycles and analysis of the degradation at other operating temperatures controlled by the varying ambient temperatures. Four representative case studies were evaluated for the combinations of high and low solar flux and high and low average ambient temperature. Electrically-optimized dispatch …