HVAC system selection and sizing

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If an energy model has already been created for use with insight,

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we can move straight to HVAC systems selection and sizing.

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The first step is to perform an ideal loads analysis,

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nothing else needs to be added or changed in the model.

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And the purpose of the ideal loads analysis is to

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determine the amount of heating and cooling each space requires.

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Unlike insight,

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energy plus runs on the desktop and returns the results in a report within rev

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it.

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The detailed report is large and comprehensive

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and contains the details of equipment sizing rates

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and the calculated loads within each of the spaces in the energy model

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rather than creating physical duct and pipework systems.

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Analytical systems provide a simple method to

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define the component parts of a system

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and to define the interdependency between each element of an analytical system.

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Analytical water loops for chilled hot and condenser water air

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systems for primary plant such as an air handling unit

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and zone equipment such as fan core units or VA V boxes can all be

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created to describe the physical systems that

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will ultimately appear in a project model.

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Finally,

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system zones define which regions of the model are served by which zone equipment.

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No modeling is required as simple sketches of closed loops,

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lines or points are enough to define a system zone.

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Once complete,

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the model can be used as a 3d analytical system schematic

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to clearly see which analytical spaces belong to which system zone

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and which analytical systems are serving those spaces and zones.

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Once the analytical systems have been created,

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HVAC loads and sizing data can be established.

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The detailed report type will now contain

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information about the required sizing for boilers,

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chillers, coils and fans with corresponding flow rates and velocities.

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Where insight provided a range of data based on the whole

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building energy plus provides specific detailed

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information on mechanical system selection.

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Additional loads reporting is also available for

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information relating to heating and cooling loads.

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The loads report presents information by each zone and by each system.

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The information is easier to navigate than the detailed report and

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includes design psychometrics for any equipment containing a cooling coil,

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the modules and other material in the

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course systems analysis for mechanical design using rev

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it

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focuses on the second part of this workflow.

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The creation of an energy model and analytical systems for the purpose

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of understanding mechanical system requirements at the early stages of a project.