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Abstrakt

In Japan, natural ventilation through large openings has been traditionally used for cooling in summer and medium seasons. Nowadays, as global warming has become a serious problem,
conscious utilization of natural ventilation is encouraged for energy conservation. A new Japanese standard enforced in 2009 first adopts a quantitative evolution method for the energy conservation effectiveness of natural ventilation. Such a social trend indicates that natural ventilation is expected to be an important technique for energy conservation.
Accordingly, we have conducted experiments in a reinforced construction (RC) multi-family residential building to verify the effectiveness of natural ventilation in energy conservation by simulating the various occupants’ behavior automatically. In this paper, we performed experiments with 2 patterns of thermal control behaviour which differ in natural ventilation usage. Based on the experimental results, we analyzed cooling hours and indoor environment. In addition, we estimated heat discharge rate by natural ventilation and heat capacity of an air conditioner to discuss heat removal structure.
The results suggest that although heat discharge by natural ventilation has a positive effect on the reduction of cooling hours, thermal energy storage during occupants’ absence in the daytime could cause additional air conditioner usage in the evening and night. And natural ventilation is estimated to reduce heat capacity of an air conditioner by 35% in an average year.
In future studies, we will research on the energy conservation techniques which utilize heat discharge effects of natural ventilation to prevent thermal energy storage in the room during the occupants’ absence.

Referanser

Ghiaus, C., Allard, F. (2006) Potential for free-cooling by ventilation, Solar Energy, Vol. 80, 402-413

Habara, H. et al. (2009) Verification of the Effect of Cross Ventilation on Energy Conservation by Simulating Occupant Behavior, Vol. 8, No. 3, The International Journal of Ventilation, 201-206

Koinakis, C.J (2005) Combined thermal and natural ventilation modeling for long-term energy assessment: validation with experimental measurements, Energy and Buildings, Vol. 37, 331-323

Sawachi,T. et al. (2007) Proposal of the Experimental Method with Lifestyle Simulating Method Aimed at Validating Energy Performance of Promising Measures: Study on the Experimental Validation of Energy Conservation Measures for Residential Buildings Part 1, Journal of environmental engineering, AIJ, No.621, 2007, 69-76





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