Assessment of relative humidity, indoor temperature and (CO2) amount with different air conditioning systems and ventilation in Northern Technical University buildings in Mosul, Iraq

Student’s achievement is affected by indoor thermal comfort, this paper aims to compare and investigatethermal comfort and indoor air quality (IAQ) In the classrooms to four buildings, The NorthernTechnical University/ Nineveh/ Iraq that contains varies kinds of air conditioning and heating ventilationsystem. Continuous on-site measurements of the internal levels of carbon dioxide (CO2), relativehumidity and temperature were registered at one-minute time intervals for each day of the week, for onemonth per building, including professional and non-professional working hours as well as weekends andcomparison with ASHRAE standards. The simultaneous external temperature and the relative humidityused in the analysis were also measured. Where the measurements were taken in the first building(College of Technical Engineering) and the second building (Technical Institute / Community HealthDepartment) and the third building (University President) and the fourth building (Technical Institute) /Department of Electricity) in (March, April, May and June) respectively. The results of the statisticalanalysis for each semester showed an average hourly value the difference (p 0.05).Overflow ASHRAE carbon dioxide levels were found to be more in buildings with a fireplace and nofan with the windows closed compared to buildings with central heating and cooling system through theworking period. Further, the thermal comfort factor was considered to be influenced by external weatherconditions and the direction of the buildings