Abstract
In sunspaces, there is an observable temperature rise above the external air temperature, caused by solar gains and the buffering effect of their enclosure. In addition, their external partitions form a barrier preventing the direct influence of the external environment and delaying the natural deterioration of elevation surface. In the paper, the temperature rise in a glazed balcony attached to a typical flat in a multifamily building, together with the energy demand in the living zone, were assessed with the use of dynamic computer simulations. Ten variants of the sunspace casing were analysed, with different thermal and solar energy transmittance of the glazing (which is a novel subject in the research area). This enabled us to evaluate average values of the temperature reduction factor during the year and to choose the most efficient variant of the sunspace external partitions. It turned out to be an insulated, double-glazed casing with a spectrally selective coating (type O 21), combining high insulative properties with high solar transmittance. These features allowed the temperature in the sunspace to rise by almost 10°C (compared with the external air) and lower total energy demand in the flat by 33% (compared with a flat with an open balcony).
Highlights
Introduction and Literature ReviewThe phenomenon of temperature increase in rooms enclosed with transparent partitions was already known in ancient times
The results showed that approximate energy savings reached 12% compared to a house without a sunspace
It is related to the physical characteristics of the greenhouse enclosure, such as thermal insulation, the ability to absorb, transmit, and reflect radiation, as well as the tightness of the external partitions and user behaviour related to, e.g., ventilation of sunspace or the use of sunshades
Summary
Introduction and Literature ReviewThe phenomenon of temperature increase in rooms enclosed with transparent partitions was already known in ancient times. Greenhouses were used in agriculture and horticulture to accelerate plant growth or the cultivation of species requiring temperatures higher than those found in a given climate zone. Orangeries have established themselves in European architecture. They were used for both practical purposes and as a sign of the financial status of the owners. By the end of the nineteenth century, the combination of glazed spaces with living space was initiated. "Solar rooms" were generally adjacent to the living rooms on the southern side and were used for periodic heating of the interiors. In addition to performing practical functions, they were a place of integration with nature and the natural environment, often constituting original and attractive architectural elements [2]
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