Abstract
The aim of this work was to estimate the effectiveness of the renovation work that was carried out in 63 Lithuanian schools by disclosing the main renovation works, analysing changes in the amount of the energy used for the heating after renovation. Reduction of the windows area with shields, replacement of old doors and windows with the new ones were the most frequent renovation works in the tested schools. 52 % of respondents indicated condensation on windows after the renovation work. The indoor temperature of the schools increased from 15 °C to 18 °C. Also, the energy consumptions for the heating of the schools was lowered by 17 % in schools with district heating system and by 22 % in schools with local boiler house.
Highlights
Many Lithuanian school buildings were constructed during the Soviet period, some even earlier
Indoor air quality (IAQ), ventilation, an increased concentration of carbon dioxide (CO2) and other contaminants, relative humidity (RH) as well as the thermal conditions inside the classrooms should be a matter of substance
The results showed that temperature, relative humidity were not in compliance with the currently required thermal comfort conditions in auditoria with old sealed windows during the heating season
Summary
Many Lithuanian school buildings were constructed during the Soviet period, some even earlier. Most of these buildings have problems such as an excessive energy use for heating, windows that are not airtight when closed, defects in the external walls, moisture damage, indoor microclimate parameters which do not correspond to the hygienic norms etc. As the most of energy is consumed for the heating buildings, this point seems to be very important in respect of energy savings. Indoor air quality (IAQ), ventilation, an increased concentration of carbon dioxide (CO2) and other contaminants, relative humidity (RH) as well as the thermal conditions inside the classrooms should be a matter of substance. A lot of organisational and technical problems arose together with this process
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