Overview
- A Science Advances paper published Nov. 12 details a UC Davis device that generates mechanical power outdoors at night using deep space as a radiative cold sink.
- Year-long field tests produced an approximately 10°C temperature difference after sunset and at least 400 milliwatts of mechanical power per square meter.
- The setup directly drove a small fan and, when coupled to a motor, generated electrical current in demonstrations.
- A greenhouse trial showed the engine-powered fan provided enough airflow to regulate temperature during the night.
- Performance is strongest on clear, low-humidity nights, and UC Davis has filed a provisional patent as the team refines the design and explores scaling.