Πειραματική και θεωρητική διερεύνηση επάρκειας αερισμού και συνθηκών θερμικής άνεσης στο δημοτικό κολυμβητήριο κοζάνης

Abstract

This Diploma Thesis focuses on the ventilation rate of the buildings. More specific, it deals with the experimental and computational investigation of the ventilation level and internal comfort conditions in the Municipal Natatorium of Kozani. Both the natural and the enforced ventilation are an essential to buildings and especially to natatoriums, in order to ensure air quality and to protect occupant’s health. There have been developed various methods of natural and enforced ventilation systems for buildings and for sport centers too. The Municipal Natatorium of Kozani is located at the limit or the urban fabric, while it can be regarded as a single unit with the Indoor Sports Centre, which is located nearby. The building’s envelop is marked as obsolete. The main space of the natatorium is divided in three zones, the pool, the locker room and the office. The energy performance of the building may be classified as inefficient. It operates from Monday to Saturday and the hours from 09:00 to 22:30. A number of approaches are available in the relevant literature, for the experimental determination of the ventilation rate of internal spaces. This Thesis focuses on the method of tracer gas decay measurements of building air change rates and on the estimation of ventilation rates using equilibrium analysis. Measurements were performed between June and July 2016. The measured data referred to the temperature and humidity of internal air, building elements surface temperature, CO2 concentration of internal air, UV solar radiation and air speed inside the natatorium. A meteorological station was installed nearby the natatorium, in order to obtain climatic conditions. For the theoretical calculation of the ventilation rate, Comis software was used. In order to identify the values of the input parameters, the results of the experiments have been used, while if needed theoretical analysis took place. The ventilation rate was calculated for five different cases; the changing parameter has been the opening degree of specific windows and doors. A comparison between the theoretically calculated through the software and the experimentally determined ventilation rate was performed. In conclusion, the internal air conditions of the natatorium of Kozani can be characterized uncomfortable for the occupants. This can be attributed to the low, insufficient ventilation rate. The discussion at the end of this work proposes ways to increase this rate and achieve thermal comfort conditions in the natatorium, noting though that proper research is required in order to plan and implement them successfully.