U.S. Department of Energy - Energy Efficiency and Renewable Energy

SunShot Initiative

High-Temperature Thermal Array for Next-Generation Solar Thermal Power Production

Los Alamos National Laboratory logo Illustration demonstrating the movement of vapor and liquid in the cross-section of a metal pipe.

Illustration showing the contents of a long heat pipe that is designed to replace HTFs. Image from LANL

The Los Alamos National Laboratory (ORNL), under the National Laboratory R&D competitive funding opportunity, is developing a megawatt-scale heat pipe–based technology designed to bridge the heliostat reflector field and the power cycle by replacing both the solar receiver and the heat transfer fluid (HTF) system used in concentrating solar power (CSP) systems. The technology, called the high-temperature thermal array, aims to achieve the SunShot Initiative's goals by addressing technical challenges, reducing capital and operating expenses, and increasing net photon-to-electricity conversion efficiency.


The research team is working to advance key technical challenges in CSP systems to enable high-temperature thermal arrays from technology readiness level (TRL) 2 to TRL 4. Major technical aspects of this work are focused on:

  • Cost-effective wick composition
  • Thermal array fabrication methods
  • Countergravity physics
  • Heat pipe start-up and thermal cycling protocols
  • System testing and scaling for large-scale deployment.


The high-temperature thermal array uses an innovative method of capturing energy from photons and delivering it to the power cycle. By capturing the energy in the form of latent heat, the system maintains the thermodynamic availability of each incident photon at the high temperatures required to increase the efficiency of CSP systems. The use of latent heat capture and transport methods also enables new opportunities for thermal storage and the use of power cycles driven through the use of latent heat (Rankine) and isothermal heat sources (Stirling). The system has the potential to be broadly applicable in many CSP and heliostat configurations, including parabolic troughs, Fresnel lens systems, and power tower designs.

Publications, Patents, and Awards

At this time, this project does not have published articles, patents, or awards.

SunShot logo

Learn about other DOE competitive awards for concentrating solar power research that are in progress.