NUMERICAL ANALYSIS OF HEAT STORAGE OF SOLAR HEAT IN FLOOR CONSTRUCTION

In this paper, heat storage of solar heating in the floor construction of single-family houses is examined. A floor construction with two concrete decks is investigated. The lower is used as heat storage while the upper deck has a floor heating system. The potential for a reduction of the energy consumption for heating, by using heat storage in the floor construction is calculated using a dynamic simulation model of solar collector, solar tank and heat storage coupled to a building model, using the Danish Design Ref-erence Year as input.

The model calculates the performance of the solar heating system room temperature and energy consumption. A single-family house with and without heat recovery unit on the ventilation system of 130 m² with heating demand of approximately 70 kWh/m² and 40 kWh/m² is investigated. A parametrical analysis was performed for the solar collector area, and floor layouts including pipe spacing, storage materials, and distribution of insulation around the thermal storage layer.

The energy consump-tion, reduction due to the heat storage and total performance of the solar heating system was calculated. The largest reduction of 100 kWh/m² solar collector occurred in the house with the highest energy con-sumption. The reduction depends on the solar collector area, distribution of the insulation thickness, heat-ing demand and control strategy, but not on pipe spacing and layer thickness and material.

Finally, it is shown that the system can also be used for comfort heating of tiled floors during the summer period.