Abstract
The paper is oriented on the problems of heating and ventilation in small university lecture hall. Providing the optimal parameters of thermal comfort is immensely important for students of university in small university lecture hall. Incorrectly functioning heating and ventilation can disrupt thermal comfort. Reconstruction took place in small university lecture hall. The original windows were exchanged for modern wood tight windows. Experimental measurements were carried out in winter season in 2016 in this small university lecture hall, in order to evaluate the thermal comfort and CO2 concentration after the reconstruction. The device Testo 480 was used for measurements. Obtained values of air temperature, air relative humidity, air velocity, globe temperature, indexes PMV, PPD and CO2 concentration are presented in the graphs. Heating, ventilation and operation of small university lecture hall were evaluated on the basis of parameters of thermal comfort and CO2 concentration. Principles how to design the heating and ventilation in small university lecture halls are in the conclusion of the paper. Furthermore, there are presented recommendations how to operate the heating and ventilation in existing small university lecture halls.
Highlights
In old university buildings, it is very difficult rather impossible to provide thermal comfort, what relates to incorrect architectural design, old not tight windows, not insulated peripheral wall, insufficient controlled and regulated heating system and to missing mechanical ventilation system
Air temperature (Fig. 6) in the small university lecture hall was high, what relates to more causes
There was no regulation of the heating system after the reconstruction, and after the installation of new windows
Summary
It is very difficult rather impossible to provide thermal comfort, what relates to incorrect architectural design, old not tight windows, not insulated peripheral wall, insufficient controlled and regulated heating system and to missing mechanical ventilation system. New university buildings should have such thermotechnical parameters, energy economical regulated heating system and mechanical ventilation system that would enable provision of thermal comfort in small university lecture halls with high quality. Not. fulfilling the parameters of the thermal comfort in the small university lecture hall contributes to the high sickness rate of students especially in the winter [4,5]. Classroom environment is characterized by a high density of students and so the main problem is usually indoor air quality especially high CO2 concentration, which is generated by human presence (metabolism, respiration). The major problem in the small university lecture hall are cool windows; their surface should be minimized to just to provide the daily lighting. Thermal comfort in the small university lecture halls in Slovakia is not provided and often arises the local thermal discomfort. This research was focused on the evaluation of the thermal comfort parameters and CO2 concentration in small lecture hall
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