For example if there is an issue with AHU coil sizing, the sizing process will use data from all of the zones served by the AHU, and by removing most of the zones it serves you may not see the problem in the cut-down version of the model. Sometimes this is a straightforward process, but some large models have a lot of interconnected zones and HVAC components and in this case you may need to apply caution when trimming your model. You might do this by creating a version with most of the building blocks removed to allow you to focus on a few key zones. In this case simplifying your model can help you to focus on the problem areas.
Sometimes simulation models are so large and complex it can be difficult and time-consuming to track problems down.These results can be viewed after the simulation using the DesignBuilder ResultsViewer. When running Detailed HVAC, a quick, easy way to generate diagnostic system temperature, flow rate and humidity data is to select the appropriate options under the “Miscellaneous” header on the “Outputs” tab of the Simulation Calculation options dialog.
It is usually sufficient to run these diagnostic simulations for short periods such as typical winter, summer and “shoulder season” weeks. Or the results might reveal that a schedule is set up incorrectly and heating is not operating during the expected periods. For example by checking the temperatures downstream of a cooling coil you might find that it is undersized and causing inadequate cooling. Check hourly or sub-hourly results for some key parts of the building and systems.One of the most common questions we receive on our Support Desk goes something like this: “my annual summary simulation results are not what I was expecting, what’s the problem?” The techniques listed below are routinely used by the DesignBuilder Support Desk engineers and other experienced energy modellers to answer this sort of question.
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