Experimental Research on Performance of Low-temperature Thermosyphon Radiant Floor Heating

In order to apply low-quality renewable energy to heating system,a low-temperature thermosyphon radiant floor heating mode with carbon steel/water thermosyphon as heat pipe is proposed.The heat transfer characteristics of the thermosyphon radiant floor are analyzed,and the experimental research on its thermodynamic performance is carried out.Some parameters,such as temperature distribution on floor surface and heat pipe wall,the radiating heat from floor and heat transfer lag time are obtained at different water supply temperatures(35 to 45 ℃),water supply rates(0.12 to 0.37 m3 /h) and initial temperatures of floor surface(26 to 30 ℃).The results show that the thermosyphon radiant floor can reach a higher radiating heat at lower water supply temperature,and the water supply temperature of the thermosyphon radiant floor is 5 ℃ less than that of conventional plastic pipe floor.The thermosyphon radiant floor has rapid temperature rise and good heat storage,and the temperature rise time is one third of the temperature drop time.The floor surface temperature gradient is rational,which helps to reduce heat loss.The calculation formula of the radiating heat from low-temperature thermosyphon radiant floor is fit based on the experimental result.