Untersuchungen zur Intensivierung des Wärmeüberganges und Lüftungskonzepte bei Hochleistungs-Verdunstungskühlung für Gebäude

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Evaporative air-cooling is an easy way of attaining a comfortable indoor climate provided that outside air humidity is low. Unlike halogen based air-conditioners the evaporative cooling based systems are energy efficient, economical and do not damage the environment. However, they have certain limitations and there is a significant scope of improvement in the performance of existing evaporative coolers. These coolers can be useful for the centralized or decentralized cooling arrangement of the building. In hybrid ventilation it is tried to use natural forces like wind and stack effect as much as possible. But for some situations in the summer period additional cooling is necessary. Therefore, a hybrid ventilation strategy has to be evolved for the use of evaporative coolers to cool the buildings. In the Refrigeration & Air-conditioning Laboratory, Department of Mechanical & Industrial Engineering, Indian Institute of Technology, Roorkee, India, the research investigations have been carried out for the last 35 years in the area of enhancement of heat transfer during heating and cooling processes. Similarly, the research work in the area of ventilation and thermal comfort has been going on in the Institute for Thermodynamics and Building Energy Systems, TU Dresden, Germany for the past 30 years. Bringing together these experiences and designing of a hybrid ventilation system including evaporative cooling will help to save energy by maintaining the thermal comfort for a wide range of climatic conditions.