Influence of Contemporary Climate Changes on the Temperature and Humidity Conditions in the Premises of the Altera Art Gallery During the Winter Period

The microclimate of the buildings is formed under the influence of external mete-orological factors, its constructive and thermo-technical parameters, as well as the work of heating and cooling systems. Maintaining appropriate and steady temperature-humidity conditions are of crucial importance within exhibition halls of museums and art galleries, where artefacts, paintings and works of arts are shown and kept. Based on data from an experiment con-ducted within the "Altera" Art Gallery during 2007, the temperature-humidity conditions in its premises during the period 17.01 – 31.03, has been researched. The "Altera" Art Center is situated in the building of Interpred World Trade Center, Sofia. The peculiarities of diurnal course (by hourly values) and those of the average diurnal (for 24 hours) val-ues of the temperature, relative humidity, moisture content and enthalpy of the air into the exhibition hall and the repository of the gallery, against the background of those of the environment, are investigated. Relations between the average diurnal values for the parameters of the outdoor air and those inside the building (temperature, relative humidity, moisture content and enthalpy of the air into the premis-es) are also obtained.