APPAREL CALCULATOR

Joey NielsenDerek JensenRobb Hays

• Create customizable heat loss model of the human body

• Create calculator that computes insulation thicknesses for various textiles

• Translate insulation thicknesses into usable information for the user

PROJECT OBJECTIVES

• Radiation is negligible• Heat transfer between body

parts is negligible• Wind speed is normal to the

surface of body parts• Thermal conductivities and

other textile properties are uniform

• 30% of heat loss is from head• Other 70% is divided among

other body parts equally

ASSUMPTIONS

MODEL OF THE HUMAN BODY

Decompose body into system of 5 cylinders (arms, legs, torso) and 1 sphere (head) and find sizes of each using biometrics from Drillis and Contini

SOLVING FOR CONVECTIVE COEFFICIENT

Find Re, Nu, and finally h

FINDING REQUIRED INSULATION THICKNESS

Use h to find thickness, based on equivalent resistance of each layer

CAPTURING THE RESULTS

Spreadsheet programmed in Excel

• Support for multiple layers of clothing

• Computer modeling of body heat loss

• GUI standalone interface• Support for warm weather

clothing (including radiation effects)

POSSIBLE IMPROVEMENTS

APPENDIX

Derivation of solution