In temperate climate countries, mechanical ventilation and active cooling systems are common practice in such buildings. Modern low energy office buildings require energy efficient heating, ventilation, and air conditioning (HVAC) systems which can provide comfortable and healthy indoor environment. Although some heating, ventilation and cooling systems observed in this study should create the prerequisites for ensuring more comfort, results show that this is not the case for all buildings in this study. Preferring one room conditioning unit type or system may not guarantee better thermal environment without draught. Results show, whether and in what extent the standard-based criteria for thermal comfort is suitable for actual usage of the occupants.
The purpose of the survey is to assess the correspondence between heating, ventilation and cooling system design, and the actual situation. The on-site measurements consisted of thermal comfort and draught rate assessment with indoor climate questionnaire. All sample buildings were less than six years old, equipped with dedicated outdoor air ventilation system and room conditioning units. Studied office landscapes vary in heating, ventilation and cooling system parameters, room units, and elements. In this paper, the results of thermal comfort and draught rate assessment in five office buildings in Tallinn are presented and discussed. Thermal comfort conditions in office buildings in Estonia have been barely investigated in the past. There has been more meaningful research performed in controlled boundary condition situations than in actual work environments involving occupants. Local thermal comfort and draught rate has been studied widely.
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