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Enclosed, glazed balconies influence the energy balance of the flats thanks to the
temperature rise caused by solar gains in unheated sunspaces. The potential benefits, however,
may differ depending on the inhabitants’ behaviour. To evaluate these effects, internal
temperature in multi-family buildings located in Zamość (a city in the eastern part of Poland)
was monitored at the turn of the years 2017 and 2018. The temperature was registered with the
use of iButton sensors located in flats and sunspaces. Three dwellings with the same orientation
were included in the research – two with glazed balconies, differing by the area of the living
space, the number of the inhabitants, and their behaviour (flats no. 1 and 2), and one with an
open balcony, used for comparison (flat no. 3). Air temperature within the glazed balconies was
usually higher than the external air temperature, and the sunspaces helped to reduce heat losses
from the adjoining rooms by 10.7% (flat no. 1) and 26.6% (flat no. 2). The apartments also
showed some differences as far as the comfort of use during summer is concerned, flat no 1 being
the most prone to overheating
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