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Identifier 000440659
Title Photonic approaches for the thermal control of photovoltaics
Alternative Title Φωτονικές μέθοδοι για θερμικό έλεγχο και βελτίωση απόδοσης φωτοβολταϊκών διατάξεων
Author Περράκης, Γεώργιος
Thesis advisor Καφεσάκη, Μαρία
Reviewer Τζωρτζάκης, Στυλιανός
Κενανάκης, Γεώργιος
Στρατάκης, Εμμανουήλ
Παπάζογλου, Δημήτριος
Πελεκάνος, Νικόλαος
Λοιδωρίκης, Ελευθέριος
Abstract Photovoltaic modules (PVs) convert incident solar power to electrical power. However, the conversion efficiency is negatively affected by their operating temperature. Additionally, high operating temperatures accelerate the photovoltaics’ thermally activated power degradation. Conventional strategies for cooling are mainly focused on non-radiative heat transfer through forced airflow or heat-pipe-based cooling, which consume extra energy and significantly increase the system’s complexity. In this study, a precise opto-electro-thermal model was developed to examine the impact of radiative cooling in commercial PVs. Specifically, in our model we exploit the electromagnetic radiation of the sun as a source of energy and the space (outside the earth's atmosphere) as a "heat sink" with a much lower temperature (~ 3 K) than the atmosphere (~ 300 K). Optimal utilization of both "sources" can lead to an increase of the solar absorption and a reduction of the operating temperature. This temperature reduction can be achieved by the proper integration into photovoltaics of suitable photonic structures/coolers that (i) selectively reflect the unwanted sunlight (reducing this way the device heat load) and (ii) enhance the thermal emission within the atmospheric transparency window at mid-infrared wavelengths (8-13 μm). Our results demonstrated that radiative cooling and other photonics-based heat reduction techniques can lower PV temperature and enhance the output electrical power when appropriate materials and photonic designs are effectively combined, even in the case of structures with reduced complexity. The main advantages of these techniques are the passive (no extra energy input needed) and environmental-friendly operation, as well as, the increased device lifetime.
Language English
Subject Photonics
Solar cells
Thermal radiation emission
Εκπομπή θερμικής ακτινοβολίας
Issue date 2021-07-29
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work--Doctoral theses
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