THE ASSESSMENT OF INDOOR TEMPERATURE AT HEAT SUPPLY BREAK ACCORDING TO THE THERMAL PROPERTIES OF BUILDING ENVELOPE AND AIR TIGHTNESS

THE ASSESSMENT OF INDOOR TEMPERATURE AT HEAT SUPPLY BREAK ACCORDING TO THE THERMAL PROPERTIES OF BUILDING ENVELOPE AND AIR TIGHTNESS J. Karbauskaite1, V.Stankevicius1, A. Burlingis1, R.Morkvenas2 1Kaunas Technology University, Institute of Architecture and Construction, Tunelio 60, Kaunas, LT-44405, Lithuania 2Kaunas Technology University, Faculty of Construction and Architecture Studentu 48, Kaunas, LT-51367, Lithuania SUMMARY The economical casualties could be of tremendous value with the restoration of the pipelines themselves, tenant relocation and other additional works if the heat supply break in the district heating pipelines happens because of the severe outdoor temperature. The feasibilities of the freezing in heating system of existing apartment buildings at various duration of the heat supply break in regard to building envelope characteristics and outdoor temperature, as well as the danger of freezing in main heat supply pipes in the building are analyzed with the purpose to avoid or decrease the level of possible losses. The special calculation method is composed for the assessment according to outdoor infiltration level, thermal resistance and heat capacity of the envelope and heat supply pipelines in the building. In regard to the removal experience at accomplished heat supply breaks and with purpose to decrease risk of the future casualties, the following investigation was been performed: - The limit period of chilling down to 0 oC in the spaces of apartment buildings and in the main pipelines of the heating system is assessed due to thermal capacity level, thermal resistance of the building envelope elements, outdoor air infiltration level, insulation type of the pipelines at calculated outdoor temperature (-15, -20, -25, -30 oC) of in the moment of heat supply break; - The limit values of heat supply break duration is determined for the restart of heat supply after a accident in heat supply with the purpose to uphold the heating system in the order of existing apartment buildings of mass quality and of the new construction type; - The main recommendations for safety measures implementation are suggested.