Outdoor Sensors Preview

The ThermoHelioDome has been winterized to prevent the bulbs from freezing by using a hot water heater to provide heat to circulating water. Track the performance of the dome’s heater here and the mean radiant temperature here. Eventually, the entire sensor network will be posted online.

Princeton CHAOS Lab Website

Welcome to the new Princeton CHAOS Lab website!

Cooling and Heating for Architecturally Optimized Systems

Research Group of Dr. Forrest Meggers,
Asst. Prof. at the School of Architecture &
Andlinger Center for Energy and the Environment

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Passive Radiant cooling surface material Nature Paper (Fan @ Stanford)

The group fo Shanhui Fan published a paper in Nature, “Passive radiative cooling below ambient air temperature under direct sunlight.” I demonstrates how a nanostructured surface and shift the wavelength of radiant emission into a band where the atmosphere is transparent, greatly increasing the thermal gradient and cooling potential by radiating to the sky. They were able to cool the surface to 4.9 degrees C below the ambient air temperature in sunlit conditions.


Nature paper:



Media article:


ThermoHelioDome Construction + DAQ

Watch all aspects of our radiant cooling dome construction, from robot foam fabrication and hot wire cutting to truck rigging and gorilla gluing. At the end, check out the in-house design for mean radiant temperature sensing and the wet-bulb temperature depression through the cooling reflected by the dome’s dishes, viewed in the IR spectrum.

Read more about the ThermoHeliDome.

Read more about CHAOS and Infrared Sensing in Campus as a Lab.

Research team led by Prof Forrest Meggers, faculty jointly appointed in the School of Architecture and the Andlinger Center for Energy and the Environment.