Study On The Control Strategies For Radiant Floor Heating Systems

The radiant floor heating system (RFH) has the advantage of suitable feeling and energy saving. In the twenty century, the RFH has been applied in many buildings. Following the development of plastic pipes and the improvement of building technology, the RFH has more applications. But how to use this system more efficiently. My article focuses on one point of this problem----the regulation of the RFH. Because the floor is the hest resourse and the thermal storage body in the RFH, the normal regulation methods have uncertain effect on the indoor air temperature stablility. So study on the regulation methods of RFH is very necessary.Through establishing the model of radiant floor heating systems, and measuring the temperature of indoor air, floor surface, wall surface and ceiling surface in the stable condition, the article calculate the heat transfer between the inside surfaces. By reducing a multisurface enclosure to a two-surface approximation, simple formulas are used to get the relationships among the floor surface temperature, average unheated surface temperature and the heat transfer. The experiment used different control strategies to get the temperature fluctuation of the indoor air, slab surface and wall surface in a radiant floor heating system (RFH). Analyses the effect of outdoor temperature, enclosure structures and heating storage characteristic that influence the indoor air temperature and the enclosure temperature, and compares several control strategies about RFH――air-based on/off control,slab-based on/off control,and two parameter on/off control. Then we can get relative performance of the temperature fluctuation. This can be very helpful to the regulation ofRFH systems in fact.