Inproceedings,

Data Enviroments and Processing in Semi-Automated Simulation with EnergyPlus

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CIB W078-W102: 28th International Conference. CIB, Sophia Antipolis, France, (2011)

Abstract

Building energy performance (BEP) simulation is increasingly used worldwide to quantitatively justify bui lding design decisions and building operations strategies . I t is becoming increasingly obvious that the results of such simulation are often questionable, cannot be trusted, and may lead to wrong decisions. Poor simulation model definition and the use of inappropriately acquired and transformed data are two of the most common causes of this. The use of LBNL methodology for semi - automated BEP simulation data input automates data acquisition and transformation, which removes human decision making from the simulation input data definition process. The first of the three major software components (th e Geometry Simplification Tool or GST) is already in use. Work on the second component ( an interoperable HVAC graphic user interface for EnergyPlus ) is under de velopment . The third component ( an internal loads generation tool) will be developed in the near future. The original HVAC GUI for EnergyPlus component has evolved into a BEP simulation platform c ode - nam ed Mojito. A new internal data model which defines all object/attribute/ relationship sets used in BEP simulation , called SimModel, is t he central feature of Mojito . Modeling imprecision is very characteristic of geometry representation in building models submitted by the Architecture - E n gineering - Constru ction - Owners - O perator (AECOO) industry. This , and the lagging and very slow development of CAD utilities that can generate higher - level space boundaries needed in BEP simulation , has forced the development of a new tool (SBT) that calculates higher - level space boundaries from IFC - compliant definition of basic building geometry from any model - based CAD tool . It has also forced the addition of new data transformation rules in GST. This paper descri bes the principles and high - level views of SimModel, SBT an d GST internal architectures, and discusses some of the model and tool functionalities. It also provides a brief summary of quality assessment characteristic of building models generated in the AECOO industry.

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