Figure 1: Schematic of the apparatus for the evaluation of thermal preference. The cage consisted of a rectangular copper floor with two adjacent copper tubes that produced a thermal gradient due to heat exchange between cold water flowing in one tube and hot water flowing in the other one. The cage was divided into ten segments with a 1°C difference between one other. The thermal gradient ranged from 16°C at one extremity to 25°C at the other extremity.
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