How Innovative Solutions Drive Sustainability and Healthy Living Spaces
In the evolving landscape of energy innovation, balancing decarbonization and maintaining optimal indoor air quality (IAQ) presents a complex challenge. At New York Energy Week 2024, Tony Abate, Chief Technology Officer of AtmosAir Solutions, delivers a compelling presentation titled "The Paradox Between Decarbonization and Indoor Air Quality and Using Technology to Solve the Dilemma." Abate’s insights shed light on how advanced technologies bridge the gap between reducing carbon emissions and ensuring healthy indoor environments.
The Decarbonization Imperative
Decarbonization, the reduction of carbon dioxide emissions resulting from the burning of fossil fuels, is critical to mitigating climate change. As Abate highlights, buildings in the United States account for a significant portion of energy consumption, with commercial buildings alone consuming 40% of the nation’s energy. Within these buildings, heating, ventilation, and air conditioning systems are the primary energy consumers, using 38% of the total building energy, which equates to 12% of the entire U.S. energy consumption.
The challenge exacerbates due to the fact that only 20% of the electricity in the U.S. is renewable. Additionally, natural gas, a major energy source for commercial buildings, is non-renewable. This heavy reliance on fossil fuels contributes to the greenhouse gas effect, trapping heat in the atmosphere and driving global warming.
Indoor Air Quality: The Traditional Approach
Good IAQ is essential for health and comfort, but achieving it often conflicts with energy efficiency goals. Traditional methods to improve IAQ, such as increasing outdoor ventilation and enhancing filter efficiencies, tend to increase energy consumption. The American Society of Heating, Refrigerating and Air-Conditioning Engineers provides guidance during the COVID-19 pandemic to increase outdoor ventilation and use more efficient filters to reduce the spread of airborne illnesses. However, these measures lead to higher energy usage as outdoor air must be conditioned to maintain comfortable indoor temperatures.
Filtration, the most common method of air cleaning, is a passive technique that requires contaminants to be brought to the filter to be effective. Buildings typically design for 2 to 3 air changes per hour to balance comfort and energy efficiency, but optimal IAQ requires 6 to 12 air changes per hour, significantly increasing energy consumption.
The Limitations of Passive Filtration
To illustrate the limitations of passive filtration, Abate references a simulation conducted by Holt Architects in Ithaca, New York, which examines the spread of contaminants during coughing and sneezing in an office environment with high-efficiency filters. The study finds that contaminants spread horizontally to other occupants before reaching the filters, demonstrating the limited effectiveness of passive filtration in real-time scenarios.
Active Air Cleaning Technologies
Addressing the limitations of passive methods, Abate discusses various active air cleaning technologies that do not rely on airflow or increased ventilation, thus avoiding higher energy consumption. One such technology is dielectric barrier discharge, which AtmosAir uses in its systems. Other technologies include ultraviolet germicidal irradiation, photocatalytic oxidation, and dry hydrogen peroxide.
- Ultraviolet germicidal irradiation: Uses germicidal UV light to disinfect microorganisms but is less effective on moving air streams.
- Photocatalytic oxidation: Uses UV light to create hydroxyl radicals that disinfect microorganisms but has limited reach.
- Dry hydrogen peroxide: Produces dry peroxide to combat microorganisms but is less effective against other contaminants.
- Dielectric barrier discharge: Generates bipolar ions that can agglomerate particles, reduce volatile organic compounds, and disinfect microorganisms. This method actively cleans the air without relying on contaminants returning to the device, making it more energy-efficient.
Ensuring Safety and Effectiveness
When selecting air cleaning technologies, safety and efficacy are paramount. Abate emphasizes the importance of products being listed under safety standards and conforming to engineering standards. The effectiveness of the AtmosAir technology, for example, has been demonstrated in various studies, including a significant one by Fresno State University sponsored by the San Joaquin chapter of the engineering society. This study concludes that combining dielectric barrier discharge ionization with high-efficiency filtration yields performance similar to that of a high-efficiency particulate air filter without the associated high energy costs.
Real-World Applications and Case Studies
Abate provides real-world examples of how advanced air cleaning technologies achieve both energy efficiency and superior IAQ. In New Rochelle, New York, schools implement AtmosAir technology across 97 areas. Independent testing shows significant improvements in air quality without increasing energy consumption or ozone levels, affirming the technology's effectiveness in real-world settings.
Another notable case involves a major sports arena where AtmosAir's dielectric barrier discharge technology and air monitoring systems deploy. The arena reduces its outside air intake by 50% and eliminates a stage of filtration, leading to substantial energy savings. Over one year, this results in a reduction of 2,643,189 kilowatt-hours and 1,880 metric tons of carbon dioxide emissions.
The Future of Building Intelligence
Despite the advancements in air cleaning technology, most buildings are not yet "smart." Abate notes that while nearly everyone owns a smartphone, only 13% of buildings have central automation systems. However, the trend shifts towards greater awareness and smarter buildings, driven by occupant demand for better IAQ.
Various sustainability standards, such as the USGBC LEED, International WELL Building Institute, Fitwel, and RESET, now require indoor air quality monitoring. These standards emphasize the importance of tracking and validating air quality improvements and energy efficiency measures.
ASHRAE Standard 241: A New Benchmark
A significant development in IAQ and energy efficiency is the engineering society’s Standard 241, which provides guidance on controlling infectious aerosols in indoor environments. This standard introduces the concept of equivalent clean air per person rates, recognizing that effective air cleaning can be as beneficial as increased outdoor air intake. This shift allows for improved IAQ without the associated energy costs, aligning with decarbonization goals.
Achieving Balance: Integrating Advanced Technologies for Decarbonization and Indoor Air Quality
Tony Abate's presentation at New York Energy Week 2024 underscores the critical balance between decarbonization and maintaining optimal indoor air quality. Through advanced technologies like dielectric barrier discharge ionization, it is possible to achieve both goals. These technologies offer effective air cleaning without increasing energy consumption, thereby reducing carbon emissions and supporting sustainability.
As buildings become smarter and more aware of their environmental impact, the integration of advanced air cleaning technologies will play a crucial role in creating healthier, more sustainable indoor environments. The journey towards decarbonization and superior IAQ is challenging, but with the right technological solutions, it is a paradox that can be resolved.
Abate's insights and the success stories he shares demonstrate that innovative approaches can lead to significant improvements in both energy efficiency and air quality, paving the way for a sustainable and healthy future.
