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We have conducted an experimental study on heat and moisture transfer from the unsteady state to the steady state by simultaneously comparing a hygroscopic fiber and a non-hygroscopic fiber. For correct verification of this phenomenon, we measure temperatures on the surfaces of each sample by using a thermography camera instead of point-contact thermocouples and visualizing the entire surfaces of each sample, and thereby observe changes of temperature distribution on the entire surfaces of each sample. We also evaluate how the differences in serial temperature distribution in each sample are related to the temperature and humidity around the interface between chambers, and further consider a relevance to heat-retaining property. In addition to, we attempt to the numerical analysis to clarify the mechanism of this phenomena using the adequate analytical model. Numerical results show the same qualitative tendency assuming the remaining of the adsorption and desorption effect only at the front and back side of sample, even though the sample have been attained adsorption equilibrium , thus suggesting an improvement in heat-retaining properties.

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