Researchers at Texas A&M University are exploring heat-storing polymer gels called salogels to improve building temperature regulation while cutting energy costs. These gels, rich in hydrated salts, have shown promising initial tests for use in walls, roofs, windows, and HVAC units.
- Salogels store heat by changing phases like ice melting.
- They can be embedded in building materials or HVAC systems.
- Researchers aim for durable, recyclable, and efficient gels.
What happened
Scientists at Texas A&M University have advanced the development of polymer gels called salogels that store heat energy by harnessing hydrated salts. Unlike traditional phase-change materials such as paraffin wax, these gels can store more than twice the heat per volume, are less flammable, and cost less. Early tests involved embedding these gels in model structures, where they moderated temperature swings effectively, keeping interiors cooler during the day and warmer at night.
The unique polymer-salt combination in salogels maintains high heat storage capacity by preventing the salts from leaking or separating when melting. Researchers tested different implementations, including filling pipes under floors and coating walls in experimental buildings, demonstrating the gels' dual ability to absorb heat when solidifying and release it when melting. The materials’ optical changes in windows, from opaque to transparent, mirror these phase shifts with thermal benefits.
Why it feels good
This innovation is promising because it offers a passive and energy-efficient way to moderate building temperatures, reducing reliance on electric heating and cooling systems. By storing excess heat during warmer periods and releasing it when cooler, salogels could decrease energy bills and environmental impact with little active input from occupants.
Additionally, salogels are made from readily available and affordable materials, such as calcium chloride hexahydrate, a byproduct from industrial processes. Their fire resistance and ability to be tailored for various applications—from roofing to HVAC units—make them a versatile solution with sustainability benefits. The prospect of durable, recyclable materials further enhances their appeal for long-term use in construction.
What to enjoy or watch next
Though still in early stages, ongoing research at Texas A&M and other institutions aims to overcome remaining challenges like maintaining gel firmness without sacrificing heat storage, ensuring consistent heat release, and improving humidity resistance. Future work is also employing simulations and AI to better match polymers with salts and devise blends with adjustable melting points.
Exciting next steps include exploring innovative manufacturing methods such as 3D printing of gel components and creating gel fibers for building design flexibility. Observers can look forward to pilot projects that test these gels in real buildings and further data on energy savings. These developments may soon offer a new, smarter way to keep our indoor environments comfortable while shrinking carbon footprints.