Investigation of different control strategies for floor heating systems

摘要

A number of control strategies for a floor heating system were tested for the feasibility of the utilization of the thermal mass of the floor for storing the heat gain from a solar heating system on days of high solar intensity. It should be determined how the indoor thermal climate is influenced by a higher temperature in the floor construction at different variations of the starting level for the indoor temperature and the influence of the solar heat during the day. By letting the switch on/off controlled floor heating system work for a time after the room thermostat has switched off the heat supply the floor construction is used for heat storage, meaning that the floor heating system will not supply heat when the room temperature is higher or equal to the floor temperature. On days when the sun warms the room is to a high temperature it would be possible to raise the floor temperature proportionally without increasing heat supply to the room. When the room temperature starts falling after a sunny period the stored heat in the floor construction will be slowly released. A description of the measuring methods and technical and thermal conditions is given in addition to the measurement results. The test series showed that the self-regulating effect does occur when using floor heating systems if the room temperature is higher than the surface temperature of the floor. Further detailed conclusions and comments on this system are given. (AB)