Abstract"Net Zero Energy Building" has become a prominent wording to describe the synergy of energy efficient building and renewable energy utilization to reach a balanced energy budget over a yearly cycle. Taking into account the energy exchange with a grid infrastructure overcomes the limitations of seasonal energy storage on-site. Even though the wording "Net Zero Energy Building" focuses on the annual energy balance, large differences may occur between solution sets in the amount of grid interaction needed to reach the goal. The paper reports on the analysis of example buildings concerning the load matching and grid interaction. Indices to describe both issues are proposed and foreseen as part of a harmonized definition framework. The work is part of subtask A of the IEA

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109 Die sogenannte natürliche Lüftung -Lüftung infolge Temperatur-und Windeinwirkung über geöffnete Türen und Fenster -ist auch heute noch in Wohngebäuden die verbreitetste Form des Lüftens. Da die Lüftung über Kippfenster eine übliche Form des Lüftens ist, ist die Kenntnis des Luftwechsels über Kippfenster von großem Interesse. Der Vergleich von Ansätzen aus der Literatur zur Berechnung des Luftwechsels über Kippfenster zeigt, daß diese unter Verwendung gleicher Randbedingungen zu unterschiedlichen Ergebnissen führen. Aus diesem Grund wird aus eigenen Messungen ein Modellansatz abgeleitet, der die einseitige, thermisch induzierte Kippfensterlüftung besser beschreibt und gleichzeitig das Vorhandensein einer Laibung und/oder einer Heizung berücksichtigt. Investigations on Buoyancy Induced Ventilation through bottom hung Windows. Natural ventilation -ventilation due to buoyancy and wind pressures -through windows and doors is the most common type of ventilation in dwellings in germany.Therefor, being able to predict the air change rate through bottom hung windows by simple models is important. A comparison between existing models to determine the air change rate through bottom hung windows shows, that in spite of using the same parameters the results are very different. The results from own measurements are used to formulate a modified model which describes buoyancy induced ventilation through bottom hung windows for one-sided ventilation. An internal embrasure and a heater is considered.

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