Performance assessment of a photonic radiative cooling system for office buildings

Abstract Recent advances in materials have demonstrated the ability to maintain radiator surfaces at below-ambient temperatures in the presence of intense, direct sunlight. Daytime radiative cooling is promising for building applications. This paper estimates the energy savings from daytime radiative cooling, specifically based on photonic materials. A photonic radiative cooling system was proposed and modeled using the whole energy simulation program EnergyPlus. A typical medium-sized office building was used for the simulation analysis. Several reference systems were established to quantify the potential of energy savings from the photonic radiative cooling system. The reference systems include a variable-air-volume (VAV) system, a hydronic radiant system, and a nighttime radiative cooling system. The savings analysis was made for a number of locations with different climates. Simulation results showed that the photonic radiative cooling system saved between 45% and 68% cooling electricity relative to the VAV system and between 9% and 23% relative to the nighttime radiative cooling system featured with the best coating commercially available on market. A simple economic analysis was also made to estimate the maximum acceptable incremental cost for upgrading from nighttime cooling to photonic radiative cooling.

[1]  Sona Raeissi,et al.  Skytherm: an approach to year-round thermal energy sufficient houses , 2000 .

[2]  Weimin Wang,et al.  Technical Support Document: 50% Energy Savings Design Technology Packages for Medium Office Buildings , 2009 .

[3]  Shahram Delfani,et al.  Investigation of a hybrid system of nocturnal radiative cooling and direct evaporative cooling , 2010 .

[4]  Geoff B. Smith,et al.  A Subambient Open Roof Surface under the Mid‐Summer Sun , 2015, Advanced science.

[5]  Standard Ashrae Thermal Environmental Conditions for Human Occupancy , 1992 .

[6]  R. Velraj,et al.  Passive cooling methods for energy efficient buildings with and without thermal energy storage - A review , 2012 .

[7]  Ursula Eicker,et al.  Photovoltaic–thermal collectors for night radiative cooling of buildings , 2011 .

[8]  Ole Martin Løvvik,et al.  A study of a polymer-based radiative cooling system , 2002 .

[9]  G. Mihalakakou,et al.  The cooling potential of a metallic nocturnal radiator , 1998 .

[10]  Robert Clear,et al.  An Empirical Correlation for the Outside Convective Air Film Coefficient for Horizontal Roofs , 2003 .

[11]  Marc Abou Anoma,et al.  Passive radiative cooling below ambient air temperature under direct sunlight , 2014, Nature.

[12]  Evyatar Erell,et al.  Radiative cooling of buildings with flat-plate solar collectors , 2000 .

[13]  Weimin Wang,et al.  Development of High-Efficiency Low-Lift Vapor Compression System - Final Report , 2010 .

[14]  Ronggui Yang,et al.  Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling , 2017, Science.

[15]  K. Al-Obaidi,et al.  Passive cooling techniques through reflective and radiative roofs in tropical houses in Southeast Asia: A literature review , 2014 .

[16]  Bjarne W. Olesen,et al.  Low temperature heating and high temperature cooling , 2009 .

[17]  Fred Bauman,et al.  Evaluation of cooling performance of thermally activated building system with evaporative cooling source for typical United States climates , 2013 .

[18]  Srinivas Katipamula,et al.  Energy Savings Potential of Radiative Cooling Technologies , 2015 .

[19]  Jian Zhang,et al.  Achieving the 30% Goal: Energy and Cost Savings Analysis of ASHRAE Standard 90.1-2010 , 2011 .

[20]  Min Gu,et al.  Radiative Cooling: Principles, Progress, and Potentials , 2016, Advanced science.