How Green Buildings Use Thermal Storage to Cut Carbon Emissions and Slash Utility Bills
Thermal energy storage (TES) is emerging as a transformative technology that can further advance the transition toward decarbonization. Utilizing these systems to capture power and store it for later use delivers a viable way to counter climate change and rising energy costs. They deploy affordable, clean energy when it is plentiful and needed most. Any structure can reduce its carbon footprint and lower utility costs when using TES, increasing its future resilience.
What Is TES, and Why Does It Matter for Green Builders?
The U.S. Department of Energy defines TES as stored energy in a heat source or cold sink for use at a different time, similar to batteries. These systems can retain energy for hours and weeks, discharging it to balance indoor temperatures while avoiding waste.
When homeowners or building owners combine this equipment with heat pumps, it can boost performance and efficiency. This approach to building energy management also enhances supply and demand during peak usage periods and extreme weather conditions.
Green builders who integrate this technology enable occupants to decarbonize their spaces and address renewable intermittency issues, such as those caused by solar or wind energy. For example, rooftop solar requires sunlight for electrical conversion, which is why it does not work at night. TES can absorb energy from the sun during the day for use in the evening. The same occurs with wind energy, where power is captured on windy days for when there is little to no breeze.
How Thermal Storage Slashes Emissions in Green Homes
To understand how TES reduces carbon dioxide (CO2) emissions, it is essential to appreciate the amount of energy buildings consume. The built environment is responsible for 26% of global greenhouse gases and 37% of combustion emissions. In the residential sector, a large proportion of emissions comes from heating and cooling, much of which gets wasted.
For example, studies show a 30% loss of heating and air conditioning through windows, resulting in unnecessary CO2 emissions from power plants and furnaces that must overcompensate. Improving the building envelope is critical, but TES can tackle the problem from a different angle.
These systems maximize renewable electricity use by capturing solar power during the day and storing it as heat. Homeowners can then warm their households after the sun sets. It also decreases reliance on energy-intensive power plants, charging during off-peak hours when the grid is usually cheaper. This method ensures homes do not draw expensive, high-emission electricity.
Slashing Utility Bills With Smart Energy Management
TES is a powerful strategy for cutting utility expenses with immediate time-of-use returns. Since providers charge significantly more when electricity demand is highest, homeowners can program a smart TES system to charge overnight when costs are at their lowest. It then deploys the captured excess power, drastically reducing monthly bills.
An additional cost benefit is the ability to downsize one’s heating, ventilation and air conditioning system. Standard units are sized for peak loads, with the capacity measured in refrigeration tons. For instance, one refrigeration ton is equal to 12,000 British thermal units per hour. The TES system’s ability to handle these peaks means the central chiller can be smaller, resulting in up-front financial savings and reduced long-term maintenance costs.
Building a Case With Incentives, Rebates and ROI
Aside from saving money on utilities, savvy green building professionals should make the case for TES with financial incentives. Guiding clients toward federal programs can help them reduce initial installation fees and invest in the latest energy-efficient technologies.
Additionally, many states and local utility companies offer rebates, effectively paying property owners for TES systems and helping to stabilize the grid. Clients who utilize all available incentives can significantly lower substantial outlays and accelerate their return on investment.
A Practical Guide for Green Building Professionals
According to one study, 72% of homeowners are interested in efficiency, and 64% are interested in renewable energy, suggesting a direct correlation between perceived market value and advanced solutions. Green builders must adopt a strategic approach when integrating TES, including selecting the most suitable system for their specific needs.
Hot water tanks and other sensible heat systems are reliable and cost-effective for typical residential projects. Meanwhile, latent heat systems offer a higher energy density in situations where space constraints exist, while new thermochemical systems provide maximum outputs for long-duration storage.
Regardless of the type, professionals must ensure proper sizing and conduct a thorough evaluation of the building’s square footage, daily energy loads and local climate. Calculating the precise load is crucial for achieving optimal performance and ensuring clients see the maximum savings.
The Future Is Bright for Thermal Storage in Green Construction
Green building technologies are well on their way to becoming normal across the built environment. TES, especially, could be the key to slashing emissions and energy costs, making it an essential component of the sector’s future. The ability to capture and store excess power as usable heating and cooling is fundamental to the next generation of resilient, cost-effective and decarbonized homes.