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Night ventilation coupled with thermal mass activation to reduce cooling loads in buildings: Potentialities in Europe
A theoretical study was conducted through the development of a calculation model implemented on Matlab/Simulink, in order to investigate the operative temperatures time profile inside a non air-conditioned office, ventilated through two different systems: one traditional NV (Night Ventilation) and the other based on thermal mass activation HC. In particular, this study focused on the possibility of introducing this system in Europe, considering its possible contribution with different climates. According to the carried out simulations, the HC (Hollow Core Ceiling) ventilation system yields better performances than the NV system in maintaining the indoor temperatures within the comfort range, and shows good properties in controlling the incoming ventilation air temperatures in the room. The effectiveness of a thermal mass ventilation system appears not to be related to the maximum outdoor temperature but to the difference between day and night outdoor temperatures. The analysis of the performances points out some interesting and contradictory results: the best performances are achieved in the cities of the North of Europe where the same performances are achievable with a traditional night ventilation system or just increasing the ventilation rates. Where the thermal mass activation seems to be deeply involved, with positive effects in the cooling demand during the peak hours, great ventilation rates are needed during the night and the ventilation system cannot control alone the temperature, rather the phenomenon of overheating of the ceiling has to be considered. The system managing and the energy consumption related to the working of fans represent consequently fundamental problems for possible applications.
Night ventilation coupled with thermal mass activation to reduce cooling loads in buildings: Potentialities in Europe
A theoretical study was conducted through the development of a calculation model implemented on Matlab/Simulink, in order to investigate the operative temperatures time profile inside a non air-conditioned office, ventilated through two different systems: one traditional NV (Night Ventilation) and the other based on thermal mass activation HC. In particular, this study focused on the possibility of introducing this system in Europe, considering its possible contribution with different climates. According to the carried out simulations, the HC (Hollow Core Ceiling) ventilation system yields better performances than the NV system in maintaining the indoor temperatures within the comfort range, and shows good properties in controlling the incoming ventilation air temperatures in the room. The effectiveness of a thermal mass ventilation system appears not to be related to the maximum outdoor temperature but to the difference between day and night outdoor temperatures. The analysis of the performances points out some interesting and contradictory results: the best performances are achieved in the cities of the North of Europe where the same performances are achievable with a traditional night ventilation system or just increasing the ventilation rates. Where the thermal mass activation seems to be deeply involved, with positive effects in the cooling demand during the peak hours, great ventilation rates are needed during the night and the ventilation system cannot control alone the temperature, rather the phenomenon of overheating of the ceiling has to be considered. The system managing and the energy consumption related to the working of fans represent consequently fundamental problems for possible applications.
Night ventilation coupled with thermal mass activation to reduce cooling loads in buildings: Potentialities in Europe
Nachtlüftung, gekoppelt mit thermischer Massenaktivierung, zur Senkung der Kühllasten in Gebäuden: Entwicklungsmöglichkeiten in Europa
Corgnati, Stefano Paolo (author) / Kindinis, Andrea (author) / Perino, Marco (author)
2008
8 Seiten, 5 Bilder, 4 Tabellen, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
| British Library Online Contents | 2007
Cooling load reduction by using thermal mass and night ventilation
| Online Contents | 2008
Cooling load reduction by using thermal mass and night ventilation
| Elsevier | 2008