Glazed balconies as passive greenhouse systems - Potential of their use in Poland

The paper discusses the possibilities of using passive greenhouse systems, such as glazed balconies, in an example residential building. The analyses were carried out for five localities in Poland, different in terms of external air temperature and insolation. Typical meteorological years were used as the source of climatic data needed in calculations. Two types of balcony's casing were evaluated, with high and low thermal insulating properties. Demand for heating and cooling in a flat was determined with the use of dynamic computer simulations, and the outcomes were compared with the energy performance of a flat with an open balcony. Additionally, the number of hours with the internal operative temperature exceeding 26? was taken as a measure of overheating the apartment when natural airing by opening windows was included in simulations. The calculations showed diversification in the effectiveness of greenhouse systems resulting from climatic conditions, and allowed areas which are the most suitable for the passive use of solar radiation to be identified. Practical application: Analyses present energy savings in a typical dwelling achieved thanks to glazed balconies, and allow to choose the most efficient type of balcony's envelope taking into account the heating and cooling demand, and the risk of overheating. The results are diversified in respect of building's location, showing the areas of Poland where the passive use of solar energy would be most beneficial. The calculations may become the basis for further economical evaluation of greenhouse systems effectiveness.