(8) studied for the summer season different control parameters (time of system operation, intermittent operation of circulation pump and supply water temperature control) by dynamic computer simulation. This results in a significant degree of self control, because a small change in the temperature difference will influence the heat transfer between the cooled or heated surface and the space significantly. Relatively small temperature differences between the heated or cooled surface and the space are typical for surface heating and cooling systems. Because these systems for cooling operate at water temperatures close to room temperature, they increase the efficiency of heat pumps, ground heat exchangers and other systems using renewable energy sources. Pipes carrying water for heating and cooling are embedded in the centre of the concrete slab.īy activating the building mass there will not only be a direct heating-cooling effect, but due to the thermal mass also the peak load will be reduced and transferring some of the load is transferred to outside the period of occupancy will be possible. International Centre for Indoor Environment and Energy Technical University of Denmark trend, which started in the early nineties in Switzerland (6, 7), is to use the thermal storage capacity of the concrete slabs between each storey in multi storey buildings to heat or cool buildings.
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