Fig. 3 Thermal management strategies in STD systems.

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Presentation transcript:

Fig. 3 Thermal management strategies in STD systems. Thermal management strategies in STD systems. (A) Schematic of energy balance in an STD system. The yellow arrow represents the absorbed solar flux; the three red arrows denote the energy losses by conduction, radiation, and convection; the blue arrow refers to the energy for effective water evaporation. (B) Schematic and examples of capillary channels (wick mechanism) that reduce heat loss to the bulk saline solution. Different foams (24, 25) and wood (47) have been used to enable the wick mechanism in STD systems. Reproduced with permissions from the Royal Society of Chemistry (24), the National Academy of Sciences (25), and Elsevier (47). (C) Schematic and examples of selective solar absorbers that minimize radiation heat loss (66). Reproduced with permission from the Royal Society of Chemistry (66). Comparison of a nonselective absorber and an ideal selective absorber is shown on the right. The orange and red regions denote the solar and blackbody spectra, respectively, while the dark blue curve represents the emissivity of the solar absorber. The blackbody radiation spectrum was estimated using Planck’s law of blackbody radiation with a solar absorber temperature of 373 K (133). Zhangxin Wang et al. Sci Adv 2019;5:eaax0763 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).