One important aim for the development of new air conditioning systems is the reduction of the total energy consumption. This can be reached by separation of cooling and ventilation in air conditioning systems, because it is more effective to transport energy by using water systems instead of air to deliver cooling energy to the consumers. This strategic was the base for the development of several chilled ceilling systems during the last years, so that at present there are many different systems on the market.
Ventilation and air conditioning systems mainly use fossile primary energies as gas, oil and coal for the heating and cooling processes. Air conditioning means heating and humidifying the supply air during the winter season and cooling and dehumidifying the supply air in the summer season. For these summer operations the supply air in general is cooled down lower than the dew point in order to dehumidify the air by condensation. Afterwords the supply air is reheated again to reach the required temperature level for room inlet.
The Energy-related Environmental Issues (EnREI) Programme was established in 1991 by DoE Construction Sponsorship Directorate and BRE, with the aim of reducing emissions of C02 and other greenhouse gases due to energy use in non-domestic buildings.
The causative agent of Legionnaires' disease is the bacterium Legionella pneumophila (Lp). This organism is just one species of the genus Legionel/a. To date more than 36 species of Legionella have been isolated and these are being further divided into serogroups and subgroups. Approximately 90% of cases of Legionnaires' disease have been associated with· Lp serogroup 1, subgroup Pontiac. However about half of the known species of Legionel/a have caused serious disease and several fatalities in man.
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