The Influence of Piping Thermal Insulation on Indoor Climate and Exergy Consumption Related to Hot Water Floor Heating in Tokyo

Abstract

This paper describes results of a numerical simulation and an exergy analysis focusing upon the influence of piping thermal insulation on floor heating in Tokyo. In a case, pipe length is 1m indoor and 4m outdoor, diminishing linear thermal transmittance from 6.21W/mK to 2.91W/mK can raise the seasonal minimum of a room air temperature at am 6:00 from 10.2°C to 14.5°C. The ratio of thermal exergy flowing into the floor inlet to the exergy input of a boiler increases from 2.90% to 9.50%. These are much smaller than the case of energy and also its change larger than it.