シーズヒータによる電車の床暖房方式

抄録

This paper presents a new floor-heating system for an electric train using sheathed heaters laid under the floor. The system has special heat reflective plates of aluminium with small emissivity and the lower surface of the floor being coated with a fireproof paint with large emissivity surrounding the heaters. The plates decrease heat loss radiating from the floor and the coated surface absorbs more heat from the heaters. The efficiency of the floor-heating is raised.
Authors make an experiment by a simple test model of floor-heating of the electric train, propose a two-dimensional thermal calculation model using a finite element method to analyse the process of heating of the test model and ascertain that the model enables the heating process to be analysed with a high degree of accuracy according to estimations made for the test model.
They calculate the temperature rise of its sheathed heaters, reflective plates and floor via the above model regarding the emissivity of the heater surface as a parameter for both cases of the surface being coated and not coated and estimate quantitatively that the floor-heating system is very effective. In the case of the lower surface being coated, the heater temperature is about half as high as that of it being uncoated and the radiant heat-exchange factor between the heater and the lower surface is about 3.4 times as large as that of in the case of it being uncoated with the emissivity being 0.1, and about 3.7 times as large as that of it being uncoated with the emissivity being 0.45.