Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan

A fumigation system that employed ozone gas was used for sterilizing bio-cleanrooms. In this study, the parameters affect it were examined by CFD and measurement in bio-cleanrooms. Air flow distribution had been determined in advance. Thus, the environment in the bio-cleanroom was checked to determine whether ozone gas and water vapor could spread uniformly. Ozone gas concentration, air temperature and relative humidity in the bio-cleanroom were measured, and their values were compared to the results of CFD analysis. Furthermore, the effectiveness of sterilizing the bio-cleanroom was verified by using biological indicators.

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The stochastic characteristics of the heating/cooling load of a dwelling in a residential building were investigated using time-series data estimated by Total Utility Demand Prediction System TUD-PS which can predict utility demand such as electricity, gas, hot water and air-conditioning loads on the basis of the time-varying behavior schedule of residents. The analysis indicates that the probability density distributions of heating/cooling load normalized by the average for various dwelling and family types shows a similar tendency, and optimizing parameters of Erlang distribution are presented.

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The demand for the incorporation of Building Information Modeling (BIM) in design process has been increased recently. In particular, the demand for procurement of real estate by governments in many countries is increasing greatly; this indicates the Government's preference and promotion of BIM technology. However, it is believed that there are some gaps between the demands for Japanese construction work flow and the features of BIM software. Hence Japanese mechanical, electrical, and plumbing engineers cannot enjoy the full benefits of BIM. Moreover, there is a concern that BIM implementation may reduce the work efficiencies of the engineers. We performed fit/gap analysis to study the detail of the concern and show the countermeasure to make the engineers aware of the BIM benefit more. We have summarized the essentials for future BIM development with reviews of the internal and external factors related to BIM. We conclude that there is an urgent need developing for features equivalent to a 3D modeller in BIM software in order to simplify the data input for simulations. The future work will focus on the application of BIM as a database to initialize an optimized default data set for a new project.

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