2020/10/06 by Joseph Peoples, Peoples, Joseph, Yu-Wei Hung +17 · 2 citations
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #Building Energy and Comfort Optimization #Environmental science #FOS: Physical sciences #Heat transfer #Mechanics #Meteorology #Optics #Passive cooling #Physics #Radiant cooling #Radiative Heat Transfer Studies #Radiative cooling #Radiative transfer #Thermal Radiation and Cooling Technologies #Thermal radiation #Thermodynamics #physics.app-ph
paper · pdf · doi:10.48550/arxiv.2010.02426
published in arXiv (Cornell University) (Cornell University)
arxiv created 2020/10/06 · openalex publication_date 2020/10/06 · arxiv updated 2020/10/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
A fundamental limit of current radiative cooling systems is that only the top surface facing deep-space can provide the radiative cooling effect, while the bottom surface cannot. Here, we propose and experimentally demonstrate a concept of "concentrated radiative cooling" by nesting a radiative cooling system in a mid-infrared reflective trough, so that the lower surface, which does not contribute to radiative cooling in previous systems, can radiate heat to deep-space via the reflective trough. Field experiments show that the temperature drop of a radiative cooling pipe with the trough is more than double that of the standalone radiative cooling pipe. Furthermore, by integrating the concentrated radiative cooling system as a preconditioner in an air conditioning system, we predict electricity savings of >75% in Phoenix, AZ, and >80% in Reno, NV, for a single-story commercial building.