The Laboratory for Thermal Transport and Storage (LET+S) seeks to better understand fundamental fluid dynamic and heat transfer processes, and use this insight to make more efficient thermal energy systems. Our lab uses a combination of experimental and modeling techniques to make these advances, which feed into a variety of applications including nuclear power production and building energy systems. Our lab is part of a collaborative research group at University of Wisconsin – Madison called the Solar Energy Laboratory.
At the LET+S, we lead and contribute to projects that:
- Enable us to shift and shave building electrical loads with thermal energy storage, allowing for a more renewable and sustainable electricity grid.
- Increase the efficiency of thermal equipment to reduce the energy required for a variety of processes, from industrial manufacturing to home heating and cooling.
- Facilitate the transition to electrified buildings by developing heat pump systems that can work in a wide range of climates
- Improve reactor safety in nuclear power production
Our overall goal is to develop safe and effective thermal systems that provide a benefit to society while helping our world transition to a low-carbon energy future.

Lab News

Payton defended his Masters Thesis
Payton successfully presented his Masters thesis titled “A Performance and Model Complexity Study of a Phase Change Material Thermal Energy Storage Heat Exchanger”. Congratulations Payton! He will continue working on building HVAC systems work as …
December 16, 2025
Welcomed Tyler and Sage to the group!
Tyler Lee and Sage Slater recently joined our group as MS research students. Tyler will be developing new modeling methods for annular two phase flows, and Sage will be exploring how surface properties impact the …
September 1, 2025
Presented TES work at ASME SHTC
Jack presented his work on natural convection in liquid PCM during melting at the 2025 ASME Summer Heat Transfer Conference in Westminster, CO.
July 16, 2025
Presented two-phase flow work at GRC
Dr. Mahvi and Joe Farrell presented some of our work on annular two-phase flow at the Micro and Nanoscale Phase Change Gordon Research Conference in January.
February 3, 2025- More Posts