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This current work attempts to explore the temperature’s variability through the selection of indicators that refer to the increases and decreases of three typical values of daily temperature (mean, maximum, minimum). The primary meteorological data that has been used come from the station of the Hellenic National Meteorological Service in Tatoi, the period 1955 to 2001. In total, nine indicators were developed; the time series of the number of days recorded with decrease, increase or stability of the day-by-day temperature’s characteristic value were examined annually and seasonally. The results of time series analysis led to the conclusion that, as time passes, there are changes in the decrease, increase and stability of the mean, minimum and maximum day-by-day temperature variability.

The current study attempted to investigate the temperature’s variability through the selection of indicators that refer mostly to the increases and decreases of three typical values of daily temperature (mean, maximum, minimum). The primary meteorological data that has been used come from the station of the Hellenic National Meteorological Service in Tatoi, the time period 1955-2001. The time series of the maximum and the mean number of days with a continuous increase or decrease in the daily temperature was investigated seasonally and annually. In addition, the number of switches (increases/decreases) on annual and seasonal scales was analyzed. The results of the time series analysis led to the indication that as time passes temperature’s variability grows with more switches (ups and downs), while its variations become a bit milder.

Energy consumption in school buildings and improving their energy efficiency is an important research issue. This study aims to investigate the energy behaviour of school buildings in Greece, based on their date of construction and technical characteristics, before and after the implementation of various bioclimatic intervention scenarios on them and the subsequent estimation of their cost according to their typology. The method followed is the research and collection of data on the evolution of school buildings over time and their classification into three categories, to determine the most representative in regards to their time period and their technical characteristics. Based on this standardization, their energy situation is assessed with the program of TEE-KENAK and the implementation of the Technical Instructions TOTEE / 2017. Then, scenarios regarding bioclimatic passive interventions in the shell of the buildings and in their electromechanical installation are applied and their energy efficiency is investigated, which improves significantly, especially in older buildings, with a respective reduction in their energy consumption. Finally, the cost of these interventions is calculated, depending on the category of the building and the type of intervention.

The new energy crisis, caused by the current geopolitical destabilization, has made the need to limit our energy consumption more urgent than ever. As the construction industry is widely known to be one of the most energy consuming sectors, this study aims to investigate the influence of construction professionals in implementing sustainable construction strategies, increasing the construction of sustainable buildings and infrastructure, and promoting sustainable investments. The survey was conducted using a questionnaire, addressed mainly to engineers, to investigate their willingness and motivation to enhance the design and construction of sustainable buildings and infrastructure and to promote and expand the use of renewable energy sources. The results of the study showed that almost the vast majority of engineers who participated in the survey use or recommend the use of green materials in their projects. Their motivations are mainly environmental, such as mitigating hazardous air pollutants, also, socially, such as providing healthy living conditions and finally financial, as residents save resources by saving energy. However, a significant number of participants believe that the construction cost of a sustainable building is much higher than the cost of a conventional one and see it as a deterrent reason for involvement.

One of the main parameters for the design of cigarettes is filter ventilation. As filter ventilation increases, the concentrations of Tar, Nicotine and CO (TNCO) emissions decrease. This work examines the correlation between filter ventilation and TNCO emissions, using the data of the cigarettes notified in the French market. The average values of filter ventilation, pressure drop with open and close vents and also of TNCO emissions remain quite constant during the three years examined (2018-2020). A mathematical model linking the value of filter ventilation with the values of TNCO emissions is developed. According to this model, the values of filter ventilation estimated from this model show a very good agreement with the measured values in the case of cigarettes with filter ventilation higher than 50%. Now such model could be established for lower ventilation values. These results show that the proposed model can be effectively used to correlate filter ventilation with TNCO emissions, in the case of ventilation values higher than 50%.