Methods for investigating indoor air conditions of ventilated rooms.

The acquisition of temperatures and velocities is a permanent recurrent task for the investigation of air flow in ventilated rooms. On the one hand it is important to measure the temperature and velocity field with a high spatial resolution. On the other hand, in general, varying outdoor conditions prevent from reaching a steady state and an additonal demand consists in short measuring times. Sometimes, the obtained measuring results are used both to supply appropriate boundary conditions for numerical computations and to verify the CFD-codes used. Therefore, the processing of received data has hrther importance. In this paper the advantages and limitations of thermography, the usage of thermocouples and hot wire anemometry for temperature and velocity measurement is discussed. It is shown how the application of modern system components and data post processing in connection with these methods can satisfy better the already mentioned requirements.