Heat flow measurement of human skin using a calorimetric sensor with a programmable thermostat. An alternative to climate chambers

Abstract

In this paper we discuss the advantages of using a calorimetric sensor with a programmable thermostat compared to using heat flux sensors without a thermostat. The aim of this new calorimetric sensor is to measure the heat loss of the skin accurately. The sensor's measurement procedures and their experimental validation are shown. We also discuss the characteristics of the heat transfer phenomenon that takes place when a contact sensor is applied to the skin, emphasizing on the difficulties and opportunities that this type of measurement involves. This new thermostated calorimetric sensor is able to reproduce different temperature conditions on a localized skin region, providing a potential alternative to climate chambers. In addition, determining the heat flux for different thermostat temperatures allows the determination of an equivalent thermal conductance of the skin, that is directly related to its actual physiology. Finally, skin heat power is evaluated on different subjects and skin areas, and the results provided by our thermostated calorimetric sensor are compared with those provided by non-thermostated sensors.