Innovative Thermal Batteries Could Revolutionize Data Center Energy Use
With the rapid growth of artificial intelligence and digital systems, data centers worldwide are facing an increasing challenge: managing the colossal amounts of heat generated by server operations. This heat, if left unchecked, can strain power grids and pose environmental concerns. Addressing this issue, researchers at Lehigh University have developed a novel thermal battery technology that repurposes this excess heat, offering a sustainable and cost-effective solution.
Understanding the Challenge
Data centers are notorious for producing significant excess heat as a byproduct of server and electronic equipment operations. Cooling systems are crucial to maintaining hardware functionality, yet they consume vast amounts of electricity. Traditionally, the heat removed is wasted, released into the environment. However, capturing this thermal energy could significantly enhance energy efficiency and reduce the environmental impact of these facilities.
Lehigh’s Innovative Approach
At the forefront of this innovation is Lehigh University’s development of a Thermosiphon-embedded Cementitious Matrix for sensible Thermal Energy Storage (TCM-TES). This system acts as a thermal battery, utilizing an engineered cementitious matrix combined with finned thermosiphons to efficiently store and transfer heat under isothermal conditions. The technology is versatile, functioning in both heat-to-heat and electricity-to-heat modes, and can repurpose waste heat and low-cost electricity from data centers for various applications, including district heating and industrial processes.
Performance and Impact
- High Efficiency: The thermal battery achieves a round-trip efficiency exceeding 70%.
- Versatile Applications: It upgrades heat between 120°C and 220°C, supports power generation through low-temperature Organic Rankine Cycles, and powers absorption refrigeration chillers for direct cooling. Additionally, it operates at temperatures up to 500°C for applications in power generation flexibilization, decarbonization, and concentrated solar power.
- Proven Prototype: The system’s feasibility was validated with a 150 kWh thermal battery prototype.
Future Prospects
Lehigh University’s hybrid thermal energy storage system is being licensed to Energy Storage Technologies, Inc., with plans to integrate these thermal batteries into existing energy networks for enhanced grid flexibility and optimized waste heat recovery. This initiative is supported by the U.S. Department of Energy Award Number DE-FE0031755 and references works such as IRENA’s 2019 analysis and the study “Design and experimental testing of a 150 kWh thermal battery using thermosiphons embedded in a concrete matrix for power plant flexible operation” published in Energy, 277 (2023).
This research was highlighted during the Innovating Energy and Water Solutions for Tomorrow’s AI Data Centers Symposium organized by the Center for Advancing Community Electrification Solutions (ACES) in October 2025. The information was synthesized using generative AI and reviewed by faculty and communications staff.
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