The amims of this paper is to introduce a numerical test room for developing low energy architectures including some improvements of calculaton methods and to confirm the usefulness of it through some practical applications. As the numerical test room, a smulation code was suded in two different ways, one is utilizing a CFD code itself developed by authors (micro model) and the other is applying a modified version of the CFD code (macro model). The micro model is applicable to calculate indoor airflow, temperature and thhermal comfort index distributions with various heating/cooling systems. The calculation procedure of the micro and the macro model is almost same except that flow fields are not calculated in the macro model, therefore, the room temperature is same everywhere and is expressed as one value. IN the simulation of room thermal environments, the radiant heat transfer, such as solar radiation or radiant heat exchange between wall surfaces, is very imprtant and should be treated precisely. At first, theclalculating methods of the micro model were described focussing on the treamtnet of radiant heat transfer. SThen, both the micro and macro models were applied to evaluate a distributed heat storage system with a passive solar room assuming a winter heating season. SImulations were performed with a standard weather data of Sapporo city, a cold climate district in Japan. The micro model predicts details of indoor environments, however, it required about 72 hours cputime for 8 days unsteady simulation using a alpha-tip machine, while the macro model required much less cputime for the same simulation. Although both models proved to be one of the useful tools to investigate low energy architecture developing, we should apply them according as the objective of each study.
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