Hybrid solar panels (PVTs) combine photovoltaic and thermal energy, generating electricity and hot water simultaneously. This technology makes it possible to make the most of solar energy and increase the efficiency of installations.
1. How do hybrid solar panels work?
A hybrid panel integrates two main components:
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Photovoltaic cells: they transform solar radiation into electricity, like a conventional photovoltaic panel.
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Heat exchanger: placed behind or below the cells, it allows the transfer of waste heat to a fluid (water or air).
Working Principle:
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Solar radiation falls on the panel.
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Photovoltaic cells produce electricity, but only take advantage of 15 to 20% of the energy.
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The unconverted heat is transferred to the exchanger, heating the circulating fluid.
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This process cools the cells, increasing their electrical efficiency, and recovers heat useful for heating or hot water.
Key benefit: the same panel produces two types of energy, optimizing space and cost.
2. Applications of PVT panels
Hybrid panels are highly versatile and are used in multiple scenarios:
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Housing: electricity generation and domestic hot water.
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Commercial buildings: support for HVAC systems, pool heating or hot water.
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Industry: Processes that require low or medium temperature heat along with electricity.
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Energy transition: integration into sustainable projects, reducing the carbon footprint and optimising the energy efficiency of the solar installation.
Case in point: A home with PVT panels can produce enough electricity to cover part of its electricity consumption and hot water for showers and radiator heating, all in a single compact system.
3. Advantages of hybrid solar panels
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Increased electrical and thermal efficiency
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The efficiency of photovoltaic cells decreases with increasing temperature.
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By cooling the cells with the exchanger, their performance is maintained or increased.
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Waste heat is used to heat water or air, achieving total yields of 40-60%.
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Full use of solar energy
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While a traditional PV panel only converts electricity, the hybrid panel recovers energy that would otherwise be lost.
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Reduced space and costs
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Combining electricity and heat in a single panel reduces the need to install separate systems, saving space and materials.
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Applicable to multiple climates
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Especially effective in regions with high solar radiation and simultaneous demand for electricity and heat.
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4. Types of Hybrid Solar Panels
4.1 Front Air Chambered Panels
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They use the greenhouse effect to heat air.
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Ideal for heating spaces through hot air.
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Limitation: less efficient in liquid heat recovery.
4.2 Tubeless Panels
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Heat exchange takes place on the back of the panel.
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Advantage: the pipes are behind, avoiding shading and loss of electrical efficiency.
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Commonly used in residential and commercial installations.
4.3 Liquid Solar Collectors
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They incorporate copper tubes or aluminum heat exchangers attached to the panel.
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They allow efficient cooling of the cells and heat recovery for hot water or heating.
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Commonly used in domestic hot water and combined heating PVT systems.
4.4 Concentrating solar panels (CPVT)
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They use solar concentrators and thin-film cells.
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They allow radiation to be focused on the cell, increasing electrical performance.
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At the same time, waste heat is extracted more efficiently.
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Industrial applications or large-scale installations where maximum efficiency is sought.
5. Final considerations
Hybrid panels represent an efficient and sustainable solution to maximize the use of solar energy.
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They allow electricity and heat to be generated with a single system, optimising space and costs.
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They contribute to the reduction of the carbon footprint, aligning with the energy transition objectives in Europe and other countries.
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Their installation flexibility makes them useful in residences, commercial buildings, and industries.
Conclusion: PVT technology is an advanced alternative to separate photovoltaic and thermal systems, offering greater efficiency and versatility in the use of solar energy.