You’re running a business where hot water is essential – whether it’s a hotel, a manufacturing plant, or a hospital. You’ve likely considered solar energy before, but did you know that traditional solar panels only convert about 20% of the sun’s energy into electricity, leaving 80% of that potential energy untapped? That’s a lot of wasted energy and a lot of money thrown at what seemed to be a worthwhile and environmentally-conscious investment.
This is where photovoltaic-thermal (PVT) hybrid systems offer a superior alternative. By combining photovoltaic technology with thermal energy capture, these systems absorb that otherwise wasted heat. This allows you to get the most out of your investment.
What We Cover:
- What Are PVT Systems?
- How Do PVT Systems Work?
- The Different Applications of PVT Systems
- What to Consider Before Investing in PVT Systems
- The Future of PVT Systems
What are PVT Systems?
PVT systems are an advanced solar technology that combines two functionalities in one panel. These systems integrate photovoltaic (PV) cells, which generate electricity from sunlight, with a thermal component that captures and uses the sun’s heat. This means you receive both electrical energy and thermal energy simultaneously, using the same surface area.
The Different Types of PVT Systems
When it comes to PVT systems, there are generally two main options: liquid-based and air-based systems, not considering gas-based systems.
Liquid-Based PVT Systems: These systems use a liquid – usually water or a water-glycol mix – to soak up the heat from the panels. They’re ideal for businesses that need a lot of hot water, like hotels, spas, or industrial kitchens. With a liquid-based PVT system, you can keep a steady hot water supply, cut down on traditional water heater use, and save money over time.
Air-Based PVT Systems: These systems capture heat using air instead of liquid. They’re typically easier and cheaper to install, making them a good fit for businesses with moderate heating needs.
How Do PVT Systems Work?
PVT systems combine photovoltaic and thermal technologies into one integrated unit. The PV part is made up of solar cells, usually made from semiconductor materials like silicon. These cells turn sunlight into electricity through a process where photons from the sun excite electrons in the material, creating an electric current. Depending on your setup, this electricity can be used immediately, stored in batteries for later use, or sent back to the grid.
The thermal part of the system works alongside the PV cells, capturing the heat that the panels produce but doesn’t convert into electricity. In liquid-based systems, a network of pipes filled with a heat transfer fluid is attached to the back of the PV panels. As the fluid moves through these pipes, it absorbs heat from the panels, which can then be used to heat water, warm spaces, or even in industrial processes that need heat.
In air-based PVT systems, air flows through channels behind the PV cells, picking up heat along the way. This warmed air can then be used to heat spaces in the building or industrial processes.
“When you choose PVT systems, you’re simply using what you already have – sunlight – and getting the most out of it, both in electricity and hot water.” – Michael Boyce, Hot Water Specialist at Solarus.
The Different Applications of PVT Systems
In commercial or industrial settings, PVT systems can make a big difference by cutting down on energy costs, especially for businesses that use a lot of hot water. They also help companies boost their sustainability efforts – a key factor in today’s market, where consumers and stakeholders increasingly prioritise environmental responsibility.
Another advantage of PVT systems is their ability to integrate with your current energy setups. They can easily work alongside your existing solar or heating systems. For example, if you already have a conventional solar PV system, a PVT system can add a thermal component without taking up any additional roof space.
What to Consider Before Investing in PVT Systems
Installation and Maintenance
The installation process for PVT systems can be more complex than that of a standard photovoltaic or solar thermal system because they integrate both technologies into one unit.
At Solarus, our team of specialised Water and Electricity installers can help you by first conducting a comprehensive feasibility study on-site. We’ll evaluate your current equipment, measure the available roof space, and determine the distance from the solar collection area to the plant room where hot water is distributed.
You’ll also be relieved to know that we offer performance analysis, preventive maintenance, and corrective actions to minimise your operating costs while ensuring your PVT system’s reliable functionality.
Cost and Payback
It’s important to recognise that PVT systems generally have higher upfront costs than standard solar PV or thermal systems. This is due to the combined technology and additional components in the installation process.
However, the payback period for a PVT system is favourable, especially in scenarios where electricity and significant amounts of hot water are needed, contributing to a quicker return on investment. Solarus’ solution allows most of our clients a return on investment (ROI) three times higher than traditional systems.
Environmental Impact and Sustainability
Investing in PVT technology reduces reliance on fossil fuels by harnessing renewable solar energy. The environmental benefits of PVT systems are particularly pronounced in areas with high energy demands and substantial water heating needs, as they help lower carbon footprints and support sustainability goals. Because PVT systems generate two types of energy from a single installation, they can also reduce the need for additional infrastructure.
The Future of PVT Systems
The future of PVT systems looks promising as the demand for sustainable energy keeps growing. As of 2024, improvements in materials and design are making PVT systems more efficient and affordable, opening them up to a wider range of uses. Innovations in hybrid technologies and energy storage are also helping PVT systems work better with other renewable sources like wind and battery storage.
With the increasing push to cut carbon emissions and hit net-zero targets, the adoption of PVT systems is speeding up in businesses. Governments and organisations are offering more incentives and support for renewable energy projects, making it increasingly appealing for businesses to jump on board.
On the tech side, ongoing research is focused on boosting the efficiency of both the solar and thermal parts of PVT systems and finding new materials that can handle tough weather conditions. These efforts aim to make PVT systems last longer and perform better over time.
“The future of solar energy is about doing more with less. PVT systems are not just about immediate savings – they allow you to set your business up for long-term success in an increasingly energy-conscious world.” – Michael Boyce, Hot Water Specialist at Solarus.
The Real-World Impact of PVT Systems
Windtown Hotel’s story is a testament to the remarkable impact of a well-designed PVT system. Before installing Solarus’ solution, the hotel grappled with sky-high electricity consumption, peaking at nearly 20,000 kWh.
The situation was even more dire when considering peak load consumption, which soared above 20,000 kW during the late summer months.
But, the picture changed dramatically after installing Solarus’ PVT system. By July 2022, electricity consumption had dropped to just 7,500 kWh, and even at its highest in September 2022, it was only about 12,500 kWh – a staggering 60% reduction. Peak load consumption saw a similar downward trend, with the highest levels dropping by 33% post-installation compared to the pre-installation period. In fact, peak load issues became virtually nonexistent most of the time.
Let us do the same for you. Contact us to learn how Solarus can save you money and energy.