Abstract
This article is the second of a two-part cycle describing the assessment of some characteristics of selected buildings with a reduced energy demand that were built in northeastern and central Poland. Two low-energy buildings (built in 1999-2001) and several buildings of NF15 and NF40 class were analyzed. Projected demand indicators for useful energy of these buildings range from 10.4 and 14.6 kWh/(m2·yr) for NF40 to 30,2 kWh/(m2·yr) for NF15. One the most important factors affecting the efficiency of low-energy buildings are: thermal quality of the housing and its tightness. This paper presents the results of the tests carried out to verify design assumptions, in particular thermal insulation of partitions, weight of thermal bridges and air tightness and its impact on the energy demand for heating and ventilation.
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