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However the main drawback in this process is that the element id is completely lost in the model, meaning that the door or window is no more recognized in the DXF file format. All the elements are represented only in the form of CAD geometry in the form of lines. We can no longer select the elements in the 3D model within the Ecotec. Thus it is recommended to create the building geometry once again within this application manually. In this case, whatever models that are generated by the designers can no longer be useful for performing any type of analysis within the Ecotec application and thus will make the design process time consuming and expensive. Another limitation of this application is that it assumes similar atmospheric conditions throughout the building area. It calculates the heat gain/loss based on the square footage per person that we can specify, but this figure is assumed to be equal for all parts of the building. In real situation, no part of the building will have equal square footage occupied by the people. Some parts of the building will have more area per person and thus the atmospheric behaviors will change drastically in such cases. Also the energy consumption calculation are based on the weather file that is required to be stored on a local computer. If we need to import the 3D model from another application such as GBS, the application does not allow to select the project location and weather data file and will assume a random location and weather file. It allows to make such selections only when we create all together a new project within eQuest along with a new 3D model.
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