Cooling Ceiling Systems and Displacement Flow.

For several years the technology of chilled ceilings has been a favourite issue among HVAC technicians and underwent a boom in the past few years. According to the survey of a German technical journal, on March the first 1993, a total of 308,490 m² of chilled ceilings had been installed in German buildings, out of which 69 per cent had been installed in new buildings and 31 per cent in modernized projects. Cooling ceiling systems are the ideal.application where high demands are placed on comfort requirements and where the energy loads are very high compared to material loads. Given the fact that cooling ceiling systems fulfill only one thermodynamical function, i. e. the cooling requirements, and do not contribute to the renewal of the indoor air, they have to be combined with an additional ventilating system. This article and the poster description describe different cooling ceiling systems in conjunction with ventilating systems, the main focus being on displacement flow.