Numerical simulation of the influencing factors of radiant floor heating system

To explore the independent influence of the main factors affecting heating on the radiant floor heating system, CFD was used to simulate the simplified multi-storey multi-family building model under different working conditions, and focusing on the calculation and comparative analysis of these four factors (heating supply, the location of room, outdoor temperature and the neighboring heating situation). The results showed that heating supply is the most important factor affecting indoor temperature, and the change of heating supply has the most obvious effect on the change of indoor temperature in the middle of the bottom layer, and the least effect on the edge of the top layer, which is a 1.6–1.7 times relationship. The influence of outdoor temperature on indoor temperature mainly depends on the area proportion of external envelope structure, and the changing rates of the indoor temperature of the edge of the top layer, the middle of the top layer, the edge of the bottom layer, the middle of the bottom layer with the outdoor temperature are 0.94, 0.93, 0.88, and 0.86. The influence of the neighboring heating situation on indoor temperature mainly depends on the surface area proportion of inner envelope structure, and the proportion of heat gain (dissipation) of each envelope to the total heat supply is basically the same, the heat dispersed through the north wall, south wall, east wall and west wall of the room at the middle of the bottom layer account for about 34%, 37%, 9%, and 9% respectively.