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Personal cooling technologies locally control the temperature of anindividual rather than a large space, thus providing personal thermal comfortwhile supplementing cooling loads in thermally regulated environments. This canlead to significant energy and cost savings. In this study, a new approach topersonal cooling was developed using an infrared-transparent visible-opaquefabric (ITVOF), which provides passive cooling via the transmission of thermalradiation emitted by the human body directly to the environment. Here, wepresent a conceptual framework to thermally and optically design an ITVOF.Using a heat transfer model, the fabric was found to require a minimum infrared(IR) transmittance of 0.644 and a maximum IR reflectance of 0.2 to ensurethermal comfort at ambient temperatures as high as 26.1oC (79oF). To meet theserequirements, an ITVOF design was developed using synthetic polymer fibers withan intrinsically low IR absorptance. These fibers were then structured tominimize IR reflection via weak Rayleigh scattering while maintaining visibleopaqueness via strong Mie scattering. For a fabric composed of parallel-alignedpolyethylene fibers, numerical finite element simulations predict 1 {\mu}mdiameter fibers bundled into 30 {\mu}m yarns can achieve a total hemisphericalIR transmittance of 0.972, which is nearly perfectly transparent to mid- andfar-IR radiation. The visible wavelength properties of the ITVOF are comparableto conventional textiles ensuring opaqueness to the human eye. By providingpersonal cooling in a form amenable to everyday use, ITVOF-based clothingoffers a simple, low-cost solution to reduce energy consumption in HVACsystems.

Infrared-Transparent Visible-Opaque Fabrics for Wearable Personal Thermal Management