In this thesis we proved the influence of debris accumulation in the filter of a fancoil, which we used to simulate the cooling of a corner room of a building during summer. To prove our hypothesis, we have carried out three sets of measurements. In the first measurement there was no debris filter on the cassette type fancoil. In the second case, we closed the filter by 3/5 to simulate debris. The third example is with a clean debris filter. We were always measuring the same parameters: temperature of the water at the inlet and outlet to the fancoil, air temperature at the inlet and outlet of the fancoil and the volume flow of water through the fancoil. From the measured data we calculated the mass flow of cooling water, the temperature differences of the cooling water between the inlet and the outlet, the mass flow of the air, the heat transfer, heat flux and the amount of heat energy removed from the air. We found out that the heat transfer is at its highest point when there is no filter in the fan-coil and at it's lowest when the filter is full of debris.
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