In the quest for more sustainable and energy-efficient buildings, a groundbreaking study has emerged that could significantly impact the way we assess and optimize lighting systems. Published in the journal *Energies* (which translates to “Energies” in English), the research introduces an extended methodology for calculating the LENI (Lighting Energy Numerical Indicator) coefficient, now including a reactive power component, dubbed LENIQ. This innovation, led by Honorata Sierocka from the Faculty of Engineering Management at Bialystok University of Technology in Poland, promises to revolutionize energy efficiency analysis in building lighting.
The study underscores the importance of considering reactive power in the energy balance of lighting systems, a factor often overlooked in traditional assessments. “Reactive power can be a significant component of the energy balance, especially in buildings with extensive lighting systems,” Sierocka explains. By incorporating the power factor (cos φ), the nature of the receivers, and the presence of constant lighting intensity (CTE) systems, the new methodology offers a more comprehensive evaluation of energy efficiency.
The research analyzed two public buildings—schools—to demonstrate the practical implications of the LENIQ coefficient. One school was equipped with a photovoltaic (PV) system, while the other was not. The results were striking: the building without PV had a LENIQ value of 58.4 kvarh/m2·year, whereas the PV-equipped school showed a dramatic reduction to 4.75 kvarh/m2·year. This tenfold decrease highlights the potential of automation and renewable energy sources in enhancing energy efficiency.
“The introduction of the LENIQ coefficient allows for a more nuanced understanding of lighting energy efficiency,” Sierocka notes. “It enables us to assess not just the active power consumption but also the reactive power, which can significantly impact the overall energy performance of a building.”
For the energy sector, this research opens up new avenues for optimizing lighting systems in commercial and public buildings. By accurately measuring and managing reactive power, facility managers and energy consultants can identify areas for improvement and implement strategies to reduce energy consumption. This could lead to substantial cost savings and a reduced carbon footprint, aligning with global sustainability goals.
The study also provides a comparative analysis with model values for different power factors, offering additional insights into the efficiency of lighting installations. This extended methodology could become a standard practice in energy audits, helping stakeholders make informed decisions about lighting design and technology.
As the world continues to push towards sustainable development, innovations like the LENIQ coefficient are crucial. They not only enhance our understanding of energy consumption but also pave the way for more efficient and environmentally friendly solutions. With further research and application, this methodology could shape the future of building design and energy management, making our spaces brighter and more sustainable for generations to come.