Journal
APPLIED THERMAL ENGINEERING
Volume 155, Issue -, Pages 631-636Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.04.014
Keywords
Heat exchanger; Phase change material; Breathing air cooling; Thermal conductivity; Latent heat
Funding
- Science and Technology Innovation Commission of Shenzhen [KQJSCX20170726145619108]
- National Key Research and Development Program of China [2017YFE0120800]
- National Natural Science Foundation of China [51702277, 51802144, 51872132]
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In the field of human survivability in elevated temperature situations such as firefighting, inhalation injuries cause a much higher mortality rate than skin burns. Conventional rescue respirators merely deal with the filtering of the toxics and smokes, while cooling left out of their consideration. This work aims to fill the gap. In this work, we propose a new scheme by utilizing the paraffin/expanded graphite composite materials to construct a heat exchanger. The material itself plays the mechanical support, the heat spreader and the heat absorber at the same time, which circumvents the use of multi-level designs. In the enclosure or semi-enclosure fire, the 500 K hot air flows through the heat exchanger and is cooled down to breathable temperature ( < 313 K). By normal human breath flux, this process can sustain for more than 20 min for personnel emergency escape. We also discussed the optimized conditions of material parameters and structural configurations. We suggested that these optimum conditions may subject to change in varying scenarios. This work is promising as a comprehensive solution to the breathing air cooling problem, while demonstrating the methodology for solving similar problems.
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