In March 2022, ASHRAE released a position document discussing the role of indoor CO2 in the context of building ventilation and IAQ. The positions address the use of CO2 as a metric of IAQ and ventilation, the impacts of CO2 on building occupants, the measurement of CO2 concentrations, the use of CO2 to evaluate and control outdoor air ventilation, and the relationship of indoor CO2 to airborne infectious disease transmission.
Submitted by Maria.Kapsalaki on Wed, 04/17/2019 - 15:35
This study deals with ventilation effects on measured and perceived indoor air quality (IAQ) in a demonstrator building where IAQ problems can occur. Unlike outdoor air, indoor air is usually recycled continuously, which makes it trapping pollutants. Indoor air quality (IAQ) is characterized by a pollutants' concentration, as well as air temperature and humidity. The study's aim is to implement an efficient and smart ventilation system while leaning on continuous measurements of indoor air pollutants in a demonstrator building via a smart sensor based on a Raspberry Pi 3 model B+ card.
Submitted by Maria.Kapsalaki on Thu, 11/23/2017 - 14:43
The Spanish Technical Building Code establishes the criteria for indoor air quality fixing minimum and constant ventilation rates per local. Currently, there is a proposal to modify the regulations so that the IAQ criteria becomes more useful by setting it based on average concentrations of CO2 and accumulated CO2 in the habitable rooms. However, the indoor average concentration is not the average concentration at which the occupants are exposed.
Submitted by Maria.Kapsalaki on Thu, 11/23/2017 - 14:21
Over the last decade, TVOC sensors have been touted as an interesting alternative to CO2 and RH sensors in DCV systems. Nevertheless, there is little evidence on the nature and the profile of TVOC concentrations in modern dwellings.
Submitted by Maria.Kapsalaki on Wed, 10/28/2015 - 16:24
Air quality in a classroom is very important. According to a study by Wargocki et al (2012) a shortage of ventilation in the classroom reduces the ability of students to concentrate and causes an increase in the number of errors during the elaboration of tasks. The aim of this study was to contribute to the optimization of acquisition and operating costs of HVAC equipment and to ensure hygienic requirements of air quality in the indoor environment for classrooms.
Submitted by Maria.Kapsalaki on Thu, 05/28/2015 - 12:49
The present study aims at investigating carbon dioxide (CO2) concentrations inside elementary schools’ classrooms and how students’ productivity is affected. Measurements were conducted in 9 naturally ventilated schools of Attica from April to May 2013. Monitoring lasted for 7 hours per day, for a period of one to five days per school. CO2 concentrations were monitored simultaneously in the inside and the outside environment of the classrooms. Indoor concentrations of CO2 in almost all schools were higher than the ASHRAE threshold limit values.
Submitted by Maria.Kapsalaki on Tue, 05/06/2014 - 15:12
The exposure of children to indoor air pollutants in school classrooms might cause them adverse health effects. In order to confront this issue, the in-depth study and evaluation of the indoor air quality in classrooms is necessary. The aims of this study are to characterize the environmental factors that affect indoor air quality.
Submitted by Maria.Kapsalaki on Thu, 10/31/2013 - 13:11
The winter thermal environment and indoor air quality in classrooms has been reported to be very poor in Japan. In this study, an air-conditioned, mechanically ventilated classroom was surveyed. Air temperature, globe temperature and the concentration of CO2 were monitored before, during and after the three-hour occupancy by 35 adults. Airtightness and airflow rates of the ventilation system were also measured.