Vivian Dorizas | National & Kapodistrian University of Athens (original) (raw)

Papers by Vivian Dorizas

Energies

One contributor’s name was missing in the original version of the authorship of the paper [...]

Comptes-Rendus de l'Académie des Sciences, Paris, (3), 1989

International Journal of Ventilation, 2013

There is little knowledge on if and how indoor environmental quality influences students' att... more There is little knowledge on if and how indoor environmental quality influences students' attendance and productivity. However, this issue has been of growing interest the recent years in the scientific community and results are showing that student learning performance is significantly affected by indoor environmental quality factors. In the present study the learning performance is examined through numerical test scores achieved by primary school students in their classrooms. The assessment of indoor environmental quality parameters such as thermal, visual, acoustic and air quality and the evaluation of Sick Building Syndrome (SBS) symptoms was conducted through questionnaires handed out to the same sample of students. Main objective of this paper is to investigate whether the degradation of the indoor environmental quality can impact the overall performance of students.

The present study aims at investigating concentration levels of particulate matter PM 10 , PM 2.5... more The present study aims at investigating concentration levels of particulate matter PM 10 , PM 2.5 , PM 1 and UFP as well as of total airborne fungi and their vertical distribution in the indoor and outdoor environment of school classrooms. Measurements were performed in two naturally ventilated high schools in Athens, from January until May 2011. Indoor concentrations of the pollutants will be presented per floor level and indoor to outdoor (I/O) concentration ratios will be estimated as a function of the floor height. The ultimate goal is to create variations' profile of I/O pollutant ratios, so as to understand the contribution of indoor sources and the extent to which the indoor air quality is being affected by the outdoor pollutants.

Advances in Meteorology, Climatology and Atmospheric Physics, 2012

Environmental monitoring and assessment, 2015

The perception of the indoor environmental quality (IEQ) through questionnaires in conjunction wi... more The perception of the indoor environmental quality (IEQ) through questionnaires in conjunction with in-field measurements related to the indoor air quality (IAQ), the thermal comfort and the lighting environment were studied in nine naturally ventilated schools of Athens, Greece. Cluster analysis was carried out in order to determine the ranges of indoor air pollutants, temperature (T), relative humidity (RH), and ventilation rates at which the students were satisfied with the indoor environment. It was found that increased levels of particulate matter did not have a negative effect on students' perception while students seemed to link the degradation of IAQ with temperature variations. Statistically significant correlations were further found between measurement results and students' perception of the IEQ. Students' sick building syndrome (SBS) symptoms and performance of schoolwork were also investigated as a function of the levels of indoor air pollutants and ventilat...

The Science of the total environment, 2015

Ventilation rates and indoor air pollutants have been extensively monitored in nine naturally ven... more Ventilation rates and indoor air pollutants have been extensively monitored in nine naturally ventilated primary schools of Athens, Greece during spring. The ventilation rates and pollutant levels were studied during the teaching and non-teaching periods and ventilation profiles were created for each of the schools. The median ventilation rates per school ranged between 0.7 and 8 ACH while the average ventilation rate in all schools (11.7l/s/p) was greater than the minimum recommended rates by ASHRAE for school classrooms. The average carbon dioxide (CO2) concentrations per school varied between 893 and 2082ppm, while the majority of the cases were slightly above the recommended limit values. CO2 concentrations were also positively correlated to the number of students and negatively correlated to the ventilation rates. Particles of several size ranges (PM10, PM5, PM2.5, PM1, PM0.5 and UFP) were also measured and analyzed. PM10 concentrations exceeded the recommended limit values by ...

Combining heat recovery with natural ventilation is a relatively new topic of significant academi... more Combining heat recovery with natural ventilation is a relatively new topic of significant academic and commercial interest. The present study shows the performance of a recently developed Passive Ventilation system with Heat Recovery (PVHR) installed in a primary school building. The study includes (i) long term (12-month period) monitoring of the thermal environment and CO2 concentrations and (ii) intense short term monitoring (2-week period during the heating season) of the environmental conditions in two classrooms, including detailed monitoring of the temperatures and bi-directional air speeds within the system itself. Airtightness measurements using the Blower Door test method were performed, while time-varying ventilation rates within each classroom were estimated by using a form of continuity equation taking into account CO2 generation rates by occupants. Preliminary results show that average ventilation rates in the two classrooms ranged between 4.20 l/s/p and 5.93 l/s/p, ab...

Energies

There are international activities and on-going initiatives, particularly at the European level, ... more There are international activities and on-going initiatives, particularly at the European level, to define what Positive Energy Districts should be, as the driving concept for the urban transition to a sustainable future. The first objective of the paper is to contribute to the on-going and lively debate about the definition of the notion of Sustainable Plus Energy Neighbourhood (SPEN), which highlights the multiple dimensions when talking about sustainability in districts moving beyond the traditional and strict building energy assessment. Based on a holistic methodology which ensures the consideration of the multidimensional nature and goals of SPEN, the paper outlines an evaluation framework. The evaluation framework defines the key performance indicators distributed in five categories that consider energy and power performance, GHG emissions, indoor environmental quality, smartness, flexibility, life cycle costs and social sustainability. This framework is designed to be impleme...

The present study investigates the indoor thermal comfort perceived by students through a questio... more The present study investigates the indoor thermal comfort perceived by students through a questionnaire survey conducted during spring 2013 in naturally ventilated primary schools in Athens. Thermal environment parameters such as air temperature, relative humidity, air velocity and mean radiant temperature were simultaneously measured. Then, Fanger's indices of Predicted Mean Vote (PMV) and Percentage of People Dissatisfied (PPD) were calculated by using clothing and metabolic rates. The main purpose of this work is the evaluation of the ability of the answers from students to be sufficient to assess the thermal environment of classrooms. The possible associations between subjective thermal sensation votes and objective measurements are examined by comparing students' answers based on the seven point thermal sensation scale and the results taken by the calculated indices of PMV and PPD.

Energy and Buildings, Nov 1, 2018

The concentration levels of particulate matter (PM), airborne fungi, carbon dioxide as well as te... more The concentration levels of particulate matter (PM), airborne fungi, carbon dioxide as well as temperature
and relative humidity were investigated in the indoor and outdoor environment of two schools in Athens,
Greece during the period January to May 2011. The overall concentration ranges of the indoor measured
pollutants were: PM10: 14.92-166.18 μg/m3, PM2.5: 3.16-31.27 μg/m3, PM1: 0.72-9.01 μg/m3, UFP: 4188-
63093 pt/cm3, total airborne fungi: 28-2098 CFU/m3 and CO2: 389-1717 ppm. The relationships between PM
and airborne fungi were mainly examined, and bivariate correlations of all the measured environmental
parameters are also reported. The results indicate that PM of certain aerodynamic diameters significantly
correlate to the total airborne fungi and their prevalent genera, Penicillium, Cladosporium and Aspergillus.
Principal Component Analysis (PCA) was conducted so as to cluster variables of common characteristics.
Furthermore, simple and multiple linear regression models were developed to investigate several cases of
dependent variables to be used for prediction purposes in health risk assessments.

Energies

One contributor’s name was missing in the original version of the authorship of the paper [...]

Comptes-Rendus de l'Académie des Sciences, Paris, (3), 1989

International Journal of Ventilation, 2013

There is little knowledge on if and how indoor environmental quality influences students' att... more There is little knowledge on if and how indoor environmental quality influences students' attendance and productivity. However, this issue has been of growing interest the recent years in the scientific community and results are showing that student learning performance is significantly affected by indoor environmental quality factors. In the present study the learning performance is examined through numerical test scores achieved by primary school students in their classrooms. The assessment of indoor environmental quality parameters such as thermal, visual, acoustic and air quality and the evaluation of Sick Building Syndrome (SBS) symptoms was conducted through questionnaires handed out to the same sample of students. Main objective of this paper is to investigate whether the degradation of the indoor environmental quality can impact the overall performance of students.

The present study aims at investigating concentration levels of particulate matter PM 10 , PM 2.5... more The present study aims at investigating concentration levels of particulate matter PM 10 , PM 2.5 , PM 1 and UFP as well as of total airborne fungi and their vertical distribution in the indoor and outdoor environment of school classrooms. Measurements were performed in two naturally ventilated high schools in Athens, from January until May 2011. Indoor concentrations of the pollutants will be presented per floor level and indoor to outdoor (I/O) concentration ratios will be estimated as a function of the floor height. The ultimate goal is to create variations' profile of I/O pollutant ratios, so as to understand the contribution of indoor sources and the extent to which the indoor air quality is being affected by the outdoor pollutants.

Advances in Meteorology, Climatology and Atmospheric Physics, 2012

Environmental monitoring and assessment, 2015

The perception of the indoor environmental quality (IEQ) through questionnaires in conjunction wi... more The perception of the indoor environmental quality (IEQ) through questionnaires in conjunction with in-field measurements related to the indoor air quality (IAQ), the thermal comfort and the lighting environment were studied in nine naturally ventilated schools of Athens, Greece. Cluster analysis was carried out in order to determine the ranges of indoor air pollutants, temperature (T), relative humidity (RH), and ventilation rates at which the students were satisfied with the indoor environment. It was found that increased levels of particulate matter did not have a negative effect on students' perception while students seemed to link the degradation of IAQ with temperature variations. Statistically significant correlations were further found between measurement results and students' perception of the IEQ. Students' sick building syndrome (SBS) symptoms and performance of schoolwork were also investigated as a function of the levels of indoor air pollutants and ventilat...

The Science of the total environment, 2015

Ventilation rates and indoor air pollutants have been extensively monitored in nine naturally ven... more Ventilation rates and indoor air pollutants have been extensively monitored in nine naturally ventilated primary schools of Athens, Greece during spring. The ventilation rates and pollutant levels were studied during the teaching and non-teaching periods and ventilation profiles were created for each of the schools. The median ventilation rates per school ranged between 0.7 and 8 ACH while the average ventilation rate in all schools (11.7l/s/p) was greater than the minimum recommended rates by ASHRAE for school classrooms. The average carbon dioxide (CO2) concentrations per school varied between 893 and 2082ppm, while the majority of the cases were slightly above the recommended limit values. CO2 concentrations were also positively correlated to the number of students and negatively correlated to the ventilation rates. Particles of several size ranges (PM10, PM5, PM2.5, PM1, PM0.5 and UFP) were also measured and analyzed. PM10 concentrations exceeded the recommended limit values by ...

Combining heat recovery with natural ventilation is a relatively new topic of significant academi... more Combining heat recovery with natural ventilation is a relatively new topic of significant academic and commercial interest. The present study shows the performance of a recently developed Passive Ventilation system with Heat Recovery (PVHR) installed in a primary school building. The study includes (i) long term (12-month period) monitoring of the thermal environment and CO2 concentrations and (ii) intense short term monitoring (2-week period during the heating season) of the environmental conditions in two classrooms, including detailed monitoring of the temperatures and bi-directional air speeds within the system itself. Airtightness measurements using the Blower Door test method were performed, while time-varying ventilation rates within each classroom were estimated by using a form of continuity equation taking into account CO2 generation rates by occupants. Preliminary results show that average ventilation rates in the two classrooms ranged between 4.20 l/s/p and 5.93 l/s/p, ab...

Energies

There are international activities and on-going initiatives, particularly at the European level, ... more There are international activities and on-going initiatives, particularly at the European level, to define what Positive Energy Districts should be, as the driving concept for the urban transition to a sustainable future. The first objective of the paper is to contribute to the on-going and lively debate about the definition of the notion of Sustainable Plus Energy Neighbourhood (SPEN), which highlights the multiple dimensions when talking about sustainability in districts moving beyond the traditional and strict building energy assessment. Based on a holistic methodology which ensures the consideration of the multidimensional nature and goals of SPEN, the paper outlines an evaluation framework. The evaluation framework defines the key performance indicators distributed in five categories that consider energy and power performance, GHG emissions, indoor environmental quality, smartness, flexibility, life cycle costs and social sustainability. This framework is designed to be impleme...

The present study investigates the indoor thermal comfort perceived by students through a questio... more The present study investigates the indoor thermal comfort perceived by students through a questionnaire survey conducted during spring 2013 in naturally ventilated primary schools in Athens. Thermal environment parameters such as air temperature, relative humidity, air velocity and mean radiant temperature were simultaneously measured. Then, Fanger's indices of Predicted Mean Vote (PMV) and Percentage of People Dissatisfied (PPD) were calculated by using clothing and metabolic rates. The main purpose of this work is the evaluation of the ability of the answers from students to be sufficient to assess the thermal environment of classrooms. The possible associations between subjective thermal sensation votes and objective measurements are examined by comparing students' answers based on the seven point thermal sensation scale and the results taken by the calculated indices of PMV and PPD.

Energy and Buildings, Nov 1, 2018

The concentration levels of particulate matter (PM), airborne fungi, carbon dioxide as well as te... more The concentration levels of particulate matter (PM), airborne fungi, carbon dioxide as well as temperature
and relative humidity were investigated in the indoor and outdoor environment of two schools in Athens,
Greece during the period January to May 2011. The overall concentration ranges of the indoor measured
pollutants were: PM10: 14.92-166.18 μg/m3, PM2.5: 3.16-31.27 μg/m3, PM1: 0.72-9.01 μg/m3, UFP: 4188-
63093 pt/cm3, total airborne fungi: 28-2098 CFU/m3 and CO2: 389-1717 ppm. The relationships between PM
and airborne fungi were mainly examined, and bivariate correlations of all the measured environmental
parameters are also reported. The results indicate that PM of certain aerodynamic diameters significantly
correlate to the total airborne fungi and their prevalent genera, Penicillium, Cladosporium and Aspergillus.
Principal Component Analysis (PCA) was conducted so as to cluster variables of common characteristics.
Furthermore, simple and multiple linear regression models were developed to investigate several cases of
dependent variables to be used for prediction purposes in health risk assessments.