The layout of air-conditioning systems in building varies dramatically owing to the differences in conceptual design and the relationship between building and plant topologies. Nevertheless all air-conditioning systems have the same basic components which are responsible for the underlying thermofluids and psychrometric functions. Based on a first principles approach, the mass and energy flow in various air-handling equipment has been investigated. 20 primitive parts have been identified which can be put into the ESP-r system to simulate real air han Wing systems.
We present the SYMBOL project which is based on a modular approach of modeling. The main objectives of this project is to develop a coherent set of modeling tools which can be assembled in order to simply build particular and adapted modeling programs and to allow handling of "natural" concepts during the modeling process. The paper will deal mainly with the modularity of the SYMBOL'environment, and the needed formalism and abstraction effort made in the SYMBOL project.
Starting from the basic governing equations for fluid flows, a three-dimensional computational fluid dynamics (CFD) code is described. The pre-processing and post-processing software was integrated with the CFD code to form a more user-friendly computer package. This new computer package has been used to carry out several simulations on air and smoke movement in atrium with balconies. It has been found that the pre?processing and post-processing software can greatly reduce the data preparation and analysis time. It can also reduce the likelihood of making errors in data entry.
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