Study On Actual Performance Of The Low-Temperature Water Floor Radiant Heating System

Low-temperature water floor radiant heating system in engineering was newly developed in China. The technology character and operation mechanism of the system have not been understood maturely. We lack the experience of design and engineering .Because of this, we study the low temperature water floor heating system. The character and mechanism of heat transfer in this system are mainly analyzed, and based on it, the paper put forward a mathematical model of dual-spiral shape laid radiant floor heating system generally used in design. The paper analyzed the thermal performance of the system and determined the quantitative relation between the heat-dispersing rate per unit area, the floor surface mean temperature and the ground covering, the mean temperature of the supply and the return water, outdoor temperature etc. the paper determined the relation between the water temperature, the flux of water and the outside air temperature. In addition, we also studied the low-temperature water floor radiant heating experiment in winter. The underground and indoor air temperature distribution is analysed. Based on the experiment data, the paper compared the influence of the different underground heat preservation layer, the ground covering, the water temperature and the flux of water on the underground and the indoor air temperature distribution. Meantime, the experiment on the wall auxiliary heating system was also carried on. By analysing large amount of data, heat transfer rules in this system are summed up, and by making a summary of. large amount of engineering experience of floor radiant heating system ,we drew a doable criterion of engineering method, which provide reference for designing and engineering.Finally, another kind of low-temperature radiant heating system which was carried through electricity heating membrane was introduced and analyzed economically.