A Heat Transfer Investigation of Sleeping Bags

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Presentation transcript:

A Heat Transfer Investigation of Sleeping Bags Tyler Campbell and Curtis Rands

Sleeping Bags Portable “bed and blankets” in one Insulates and protects body from elements Available with very low temperature ratings A Heat Transfer Investigation of Sleeping Bags

How does a sleeping bag prevent different modes of heat transfer? Conduction Convection Radiation A Heat Transfer Investigation of Sleeping Bags

How does a sleeping bag prevent different modes of heat transfer? Conduction Hinders conduction from body to cold ground surface. This is enhanced with a foam sleeping pad Good insulators often solid/gas matrix; conduction is slowed due to small contact area; internal convection is slowed due to small size of air pockets. Ex: Hollowfill® polyester, goose down Convection Radiation A Heat Transfer Investigation of Sleeping Bags

How does a sleeping bag prevent different modes of heat transfer? Conduction Convection Adds to thermal resistance between body and outside air to decrease convection around body Decreases temperature gradient for convection Even when forced convection is negligible, natural convection can occur Radiation A Heat Transfer Investigation of Sleeping Bags

How does a sleeping bag prevent different modes of heat transfer? Conduction Convection Radiation Decreases temperature gradient Specially designed interior shell material can reflect body heat Low-emissivity outer surface keeps radiative heat loss to a minimum A Heat Transfer Investigation of Sleeping Bags

Experimental Data Low-Temp Mummy Bag, Reflective Liner Performed consistently better than flannel-lined bag in all tests No noticeable difference with pad (temperature gradient, surface) Mild-Temp Rectangular Bag, Flannel Liner Good insulator, flannel lining non-reflective No noticeable difference with pad (temperature gradient, surface) A Heat Transfer Investigation of Sleeping Bags

Observations in Research Very little standardized research on sleeping bags One ASTM document which used heated manikin Many other significant factors, such as tent style, metabolism, clothing, moisture, sleeping bag shape & size A Heat Transfer Investigation of Sleeping Bags

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