Spectral-Splitting PVT Filtration for PV Overheating Control
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Solution Overview
Problem
Conventional photovoltaic systems inefficiently utilize solar radiation, leading to overheating of PV cells and reduced efficiency in hybrid PVT systems, where means to ensure only usable solar spectrum reaches the PV cells are lacking.
Innovation Solution
A hybrid PVT system incorporating a spectral-splitting optical filtration channel above the PV panel, using a fluid that transmits a predefined spectral range for electrical conversion and absorbs the remaining spectrum, combined with a cooling fluid channel below the panel and an optional phase change material layer for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional photovoltaic systems are used to generate electrical energy, then electrical power is produced, but the majority of solar radiation is not utilized and PV cells become overheated
Solution Approach 1:
The solar spectrum is segmented into two parts: a first spectrum (300-1100nm) that is transmitted to PV cells for electrical energy conversion, and a second spectrum (outside 300-1100nm) that is absorbed by the optical filtration channel to generate thermal energy. This segmentation allows selective utilization of different spectral portions for different purposes.
Solution Approach 2:
An optical filtration channel containing an optical filtration fluid is introduced as an intermediary between the incident solar radiation and the PV cells. This intermediary selectively transmits the first spectrum while absorbing the second spectrum, preventing harmful radiation from reaching PV cells while still allowing useful radiation through.
2Temperature
If spectral-splitting optical filtration is implemented to prevent overheating, then PV cell temperature is controlled, but system complexity increases
Solution Approach 1:
The optical filtration channel serves multiple functions simultaneously: it acts as a spectral splitter, a thermal management device, and a heat collection system. The same structure that filters out harmful radiation also captures thermal energy for practical use, eliminating the need for separate cooling systems.
Solution Approach 2:
The patent merges the optical filtration function with the thermal energy collection function into a single integrated system. The optical filtration channel both protects PV cells from overheating and captures thermal energy, combining two previously separate functions into one unified structure.
3Temperature
If cooling systems are added to prevent PV cell overheating, then thermal management is improved, but the system becomes more complex and less efficient
Solution Approach 1:
The patent converts the harmful effect of absorbed solar radiation (which would otherwise cause overheating) into a beneficial thermal energy resource. The optical filtration channel absorbs the second spectrum that would heat the PV cells, and this absorbed energy is then available as useful thermal energy for heating or other applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively filters out non-usable solar radiation, preventing overheating of PV cells and enhancing the thermal management of the system, thereby improving the overall efficiency and operational life of the PV cells.
Implementation Method 1
An optical filtration channel is provided above the PV panel, wherein a spectral splitting optical filtration fluid in the OF channel transmits a first spectrum of solar radiation (300-1100nm) that is within an efficient range for electrical conversion by the PV cells and absorbs a second, remaining spectrum of solar radiation that is outside the efficient range
Implementation Method 2
The PV panel converts the transmitted solar radiation into electrical energy
Implementation Method 3
A cooling fluid channel is provided below the PV panel, wherein a cooling fluid in the CF channel facilitates cooling of the PV panel
Implementation Method 4
The cooling fluid circulates through the channel, absorbing heat from the PV panel and carrying it away
Implementation Method 5
A phase change material layer is provided between the PV panel and the cooling fluid channel
Data Source
AI summary
A hybrid photovoltaic thermal (PVT) system including flexible integration of spectral splitting optical filtration and thermal management utilities is described. An optical filtration (OF) channel is provided above a PV panel of the hybrid PVT system, wherein an OF fluid in the OF channel transmits a first light that is within a predefined spectral range and absorbs a second light that is outside the predefined spectral range. A cooling fluid (CF) channel is provided below the PV panel, wherein the CF channel contains a cooling fluid. A phase change material (PCM) layer is provided between the PV panel and the CF channel, wherein at least one of the OF fluid in the OF channel, the cooling fluid in the CF channel, or the PCM layer contains nanoparticles.