Conference article

The paper extends a previous model of a heated water system with stratification, with an external floor heating circulation loop and a detailed model of heat transfer from water pipe to heated room. A minor error in the previous stratification model is corrected. The floor heating loop is posed as a cross-current heat exchanger, and a simple approximation of time delay for heat advection is suggested. For heat flow to the room, infinitely fast heating of an aluminum plate is suggested, with slower heat transfer to chip-board, through fiberboard and parquet to the room. The room is heated by a combination of convection and radiation. The results show that the inclusion of the heat circulation loop shows that this has an important effect on the dynamics of the system, and that this loop should be taken into account if parameters are tuned to fit the model to experimental data.

floor heating, energy in buildings, energy storage, hot water tank model, water distribution system, stratified ?ow model