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Heat removal using microclimate foot cooling: a thermal foot manikin study
Aviation, Space, and Environmental Medicine
|April 24, 2014
Summary
Microclimate cooling systems may use the feet for efficient heat transfer. Studies show plantar foot cooling offers similar relative heat loss to other body parts but limited impact on overall body heat.
Area of Science:
- Physiology
- Thermal Regulation
- Biomedical Engineering
Background:
- Microclimate cooling systems are theorized to leverage peripheral extremities for efficient heat transfer.
- The plantar surface of the foot is a potential site for heat exchange due to its vascularization.
Purpose of the Study:
- To quantify heat transfer from the plantar foot surface using a novel microclimate cooling technique.
- To compare foot cooling efficiency against other commonly cooled body regions.
Main Methods:
- A military boot with an integrated insole cooling system (hollow tubing) was utilized.
- A thermal foot manikin (34°C) was tested under controlled conditions (30°C, 30% RH) with circulating water (20°C, 120 ml/min).
- Testing included both dry and simulated sweating (500 ml/h/m²) conditions.
Main Results:
- Heat loss measured approximately 4.1 W (dry) and 7.7 W (sweating) from the foot model.
- Relative heat loss was calculated as 3.0 W/unit body surface area (dry) and 5.5 W/unit body surface area (sweating).
Conclusions:
- Plantar foot cooling demonstrates comparable relative heat loss to other body regions.
- The absolute heat removal from the foot is insufficient to significantly impact whole-body heat balance.
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