Conduct a comparative systems analysis

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Creating analytical systems and producing an analysis report is a great way to gain

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early insight to the physical systems that will be required for your project.

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This early stage information can be leveraged to great effect.

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When considering alternative design options

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by performing a comparative analysis

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to assess the value of proposed changes to your project.

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In this project,

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we will make some simple changes to the material

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thermal properties along with some changes to the rev

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space placed in the project used to override

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the default values found in the corresponding analytical space

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to complete the analytical phase of this project.

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A new energy model will be created and an analysis

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report generated to assess the effect of making the changes.

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Ensure the view is set to mechanical analysis, 3d views and analytical spaces

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for changes made to a rivet space to

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take effect on the corresponding analytical space.

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The energy model must be deleted and recreated

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from the analyze tab of the ribbon. Select delete energy model

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then select OK to confirm

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from the project browser open the view 03 HVC plan,

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then select the rev space placed in this view

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in the energy analysis section. Of the properties select space type.

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Then from the properties set the heating set point to 68 degrees

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and the cooling set point to 70 degrees,

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then select OK to close the window.

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Next,

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we will create a new energy model where the analytical space on

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the third floor will use the edited values for the rev space

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from the analyze tab select create energy model

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and then select create the energy analytical model.

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Let's go ahead and perform the analysis

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from the analyze tab select systems analysis

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from the option select HVAC systems loads and sizing

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name the report conceptual analysis. Two

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then select run analysis

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from the analytical spaces view,

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select the analytical space whose values are taken from the rev space.

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A review of the properties shows the effect of changing

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the heating and cooling set points for the space.

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The peak heating and cooling loads are now higher.

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Next,

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we will change the material thermal properties to see

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if there's an effect on the analytical space properties,

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the equipment and HVAC sizing summary of the detailed report

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and on peak values and psychometric information in the loads report,

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delete the energy model.

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Then select energy settings from the analyzed tab of the ribbon,

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select the edit button against other options,

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then

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access the options for schematic types in material thermal properties.

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Place a check against the options for exterior walls and interior walls.

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Make sure there are no other checks.

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The thermal properties for exterior and interior walls used in the

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previous analysis will now be overridden by the value set here,

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select the dropdown menu for exterior walls and set the value

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to six inch insulation with eight inch lightweight concrete block.

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Set the value for interior walls to the first R 11 insulated wall,

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then select OK to close your windows.

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Next, we will create a new energy model.

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The analytical spaces will use the

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edited values for the material thermal properties

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from the analyze tab select create energy model

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then select create the energy analytical model.

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Let's go ahead and perform another analysis

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from the analyze tab select systems analysis.

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From the options, select HVAC systems loads and sizing

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and name the report conceptual analysis. Three.

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Then select run analysis

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begin by reviewing the properties for the analytical space

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on the third floor where it can be seen

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that changing the material thermal properties has now reduced

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the peak heating and cooling loads for this analytical space

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from the project browser open. The latest analysis report

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set the report style to detailed

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and from the table of contents select the HVAC sizing summary.

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Note the values in the top row for calculated design load and flow rate.

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A comparison with the same values on the two previous

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reports will show reductions in load and in flow rates.

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Due to the changes made

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from the report properties change the report style to loads

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and set the units to IP

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in the zone load. Summary area of the report,

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a review of VA V 015 shows a reduction in the peak cooling loads.

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And in the system load summary, a review of A

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U 01 also shows a reduction in the

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peak cooling loads compared to the previous analysis.

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Finally,

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a review of the psychometric information shows

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the corresponding changes to the air condition

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based on changes to the space properties and to the material thermal properties.

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Mechanical systems analysis allows us to describe systems,

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equipment and zones in a building.

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Without the need for physical modeling.

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It has provided insight into the calculated values in a variety

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of areas including loads and flow rates to assist in equipment sizing

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all of which has provided the flexibility to make changes and assess the outcome.

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Before deciding on a final design strategy.

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Analytical systems also provide the added benefit of not having to

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be updated and coordinated with other services or project partners models,

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providing a more flexible and agile approach to mechanical

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system design in the earlier stages of a project.