Method for Estimating Evaporative Potential (IM/CLO) from ASTM Standard Single Wind Velocity Measures
Technical rept. 2015-2016
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
Pagination or Media Count:
Three key biophysical parameters of interest when modeling thermoregulatory responses include thermal resistance Rct, evaporative resistance Ret, and wind coefficients g specific to each resistance. Using a thermal sweating manikin, biophysical properties Rct and Ret were measured on 65 different clothing ensembles. A stepwise forward adding linear regression method was used to create an estimation equation n 20 where standard 0.4 ms measures of imclo can be converted to modeling inputs at 1 ms imclo1.48 -0.04 R2 0.998. Root mean squared error RMSE and mean absolute error MAE of a verification dataset n 45, showed close agreement of the estimated and actual measured values of imclo at 1 ms, RMSE 0.013 and MAE 0.009. This report describes the mathematical methods for estimating the biophysical inputs needed for thermoregulatory modeling using only the data provided by standardized test methods. This method enables use of standard collected data, American Society of Testing and Materials International ASTM method, for modeling purposes that previously required additional testing.
- Anatomy and Physiology
- Statistics and Probability