Radiative Cooling and Cold Storage

Radiative Cooling and Cold Storage

Boulder, Colorado
Project Term:
07/31/2015 - 09/30/2018

Technology Description:

Researchers from the University of Colorado, Boulder (CU-Boulder) will develop Radicold, a radiative cooling and cold water storage system to enable supplemental cooling for thermoelectric power plants. In the Radicold system, condenser water circulates through a series of pipes and passes under a number of cooling modules before it is sent to the central water storage unit. Each cooling module consists of a novel radiative-cooling surface integrated on top of a thermosiphon, thereby simultaneously cooling the water and eliminating the need for a pump to circulate it. The microstructured polymer film discharges heat from the water by radiating in the infrared through the Earth’s atmosphere into the heat sink of cold, deep space. Below the film, a metal film reflects all incoming sunlight. This results in cooling with a heat flux of more than 100 W/m2 during both day and nighttime operation. CU-Boulder will use roll-to-roll manufacturing, a low-cost manufacturing technique that is capable of high-volume production, to fabricate the microstructured RadiCold film.

Potential Impact:

If successful, CU-Boulder’s design could provide power plant operators a low-cost way to supplement cooling without consuming additional water.


Power plants can maintain energy efficiency by using the team’s dry-cooling technology instead of water cooling when water use is restricted.


The team’s system enables more efficient radiative cooling – eliminating the need for additional water or power inputs to cool power plant condenser water.


By applying low-cost manufacturing techniques, CU-Boulder estimates the structure will be an economical option for dry cooling.


ARPA-E Program Director:
Dr. Michael Ohadi
Project Contact:
Prof. Ronggui Yang
Press and General Inquiries Email:
Project Contact Email:


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