Revit Energy Analysis

Energie Analyse BK4ON4 & BK4MA2

Voor de Revit energie analyse toets ga je de bestaande situatie doorrekenen. Hiervoor heb je het Revit energie model nodig. Het bestand kun je downloaden via BK4ON4 Downloads en Links.

Hoewel duurzaamheid meer omvat dan energie, ligt hier voor deze toets wel de focus. Voor het uitvoeren van de duurzaamheidstoets wordt daarom gebruik gemaakt van de Energy Analysis tool in Revit zelf. Deze tool is bij uitstek geschikt voor energieanalyse in de (concept) ontwerpfase.

De uitkomsten van de toets geven een richting van het energiegebruik aan. Ingrepen in het ontwerp kunnen doorgerekend en geanalyseerd worden.

Aamelden bij Autodesk 360!

Internet verbinding maken!

Om een Revit energie analyse te maken moet je inloggen via je Autodesk 360 account, dit is hetzelfde account (Autodesk ID en password) als wanneer je inlogd om Autodesk software te downloaden!!

Wanneer je een Revit energie analyse maakt moet je een internetverbinding hebben!! De analyse wordt namelijke berekend via de Autodesk 360 Servers.

Revit model klaar om te analyseren

Het aangeleverde Revit model is start klaar om een energie analyse mee te maken. Voor het starten van een analyse ga naar: Steps to setup Revit Energy Analysis

Video opzet en uitvoeren Revit Enengy Analysis

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Revit Model

Location

Location Borrendammehof Amsterdam

When you create a project it is possible to specify the geographic location using the street address or the latitude and longitude. This is useful for generating location-specific shadows for views that use them, such as solar studies and walkthroughs. The location provides a basis for weather information, which is used during energy analysis.

To specify the project location, Click Manage tab > Project Location panel > Location. You can also access this dialog from the Energy Settings dialog. When your computer is connected to the Internet this dialog displays an interactive map through the Google Maps mapping service.

Until you specify a different project location, the location is set to the longitude and latitude of the major city specified by Revit for your locale.

For the Project Address, enter the street address, city and country. Enter: Borrendammehof, 1069 Amsterdam, Nederland.

Use the following tools to adjust the map as needed:

• Pan. When you place the cursor over the map, the cursor changes to a hand, and you can drag the map to pan the view.
• For Zoom, Click + (Zoom in) or - (Zoom out), or drag the zoom slider to adjust the zoom level.
• Map. Shows street map.
• Satellite. Shows satellite imagery.

True North

Location with north arrow

The current BK4ON4 model is set on the True North, this ensures that natural light falls on the correct sides of the building model and that the sun’s path through the sky is accurately simulated.

Sun Path

Sun Path

Sun Settings

The sun path is a visual representation of the sun's range of movement across the sky at the geographic location you specify for a project.

With the solar study you use the shadow and sun path settings to see how the shadow drops over the buildings etc.

((The following is not necessary for the Energy Analysis!))

1. Go to a 3D view. It's best practice to create a new 3D view for every analysis you want to do so you can specify the particular settings for that analysis.
2. On the View Control Bar, click (Visual Style) and in the pop-up click Graphic Display Options.
3. In the Graphic Display Options dialog:
   • Under Shadow, verify that Cast Shadows is selected. Another option is to use the Shadow Icon . This will turn the shadow ON/OFF.
   • To control the Shadow contrast, you may change the Shadow value under Lighting. The default is 50, lower values result in smaller contrast between bright and shadow areas. Set it to 30 for now.
4. On the View Control Bar, click (Sun Path) and in the pop-up click Sun Settings.
5. In the Sun Settings dialog, select Still.
6. Select a date and time. (Currently 21-06-2014, 13:00 h)

Revit model types

Detailed model

Wall type (layers) with 'Core Boundary'

Floor type (layers) with 'Core Boundary'

3D section with joined geometry

Walls, floors and roofs are normally built up out of different layers. In the type properties under structure you can set the material, thickness and function of these layers.

The Core Boundary contains the load bearing structure, usually a single layer. This can be different if you have a column/beam system.

Correctly using Revit Types (layers) gives Revit the possibility to connect objects automatically. Make sure you have the Layer Functions in the Edit Assembly window of the Type set correctly. Make sure that different objects overlap in order to give Revit the ability to correctly connect them. For instance a floor has to overlap with the wall.

Use the Join Geometry tool to create clean joins between 2 or more host elements that share a common face, such as walls and floors.

To join geometry:

1. Click Modify tab>>Geometry panel>> Join (Join Geometry).
2. If you want to join the first selected geometry instance to several other instances, select Multiple Join on the Options Bar. If you do not select this option, you must make a first and second selection each time.
3. Select the first geometry to join (for example, a wall face).
4. Select the second geometry to join to the first (for example, an edge of a floor).

For more detailed information see:

• Revit Modeling: Basic Elements - Advanced Concepts
• Revit Types

Rooms

Rooms BK4ON4 model

Room Schedule BK4ON4 model

Create Rooms to create energy analysis! In the BK4ON4 model they are already available.

You can define rooms in your plan. This is useful in your Plan Views, as each room gets a Room Tag that can be used to identify the room. But it is also used to create Room Schedules: an overview of all rooms in your project. You can list all kinds of additional room properties in a Room schedule, such as area or volume.

1. Open your Floor Plan.
2. On the Architecture tab, in the Room & Area panel, click (Room)
3. When you move your mouse pointer to your floor plan, Revit highlights each room in your drawing as it detects it. Rooms must be closed regions, bounded by model elements (walls etc) and Room Separation Lines.
4. Click for each highlighted area that you want to create a Room for. Note that each room is identified by a number and a text (defaults to 'Room'). The number is automatically incremented by Revit.
5. In the Ribbon, click (Modify) to end the command.

If Revit doesn't recognize a room, make sure it is closed entirely by walls, windows and doors and that the enclosing walls have set Room Bounding set to 'on' in their properties. Retaining walls have this option set to 'off' by default.

To add Room Separation Lines: On the Architecture tab, in the Room & Area section, click (Room Separator).

Revit creates Room Tags in each room. Double-click the 'Room' text of each Room tag to rename it to something useful. Each name results in a different fill-color. When you use the same text twice, both rooms will have the same color. If you don't have a Color fill Legend you won't see any colors yet, you will need to create one to be able to see the colors (see Room Legend ).

Make sure to set the Visual Style of your Plan View to Hidden Line (using the View Control Bar). When you use Wireframe, the room fill color will run to the centerline of the walls, effectively overlapping your walls.

Revit Energy Analysis

Introduction

Output energy analysis

Create conceptual masses, enable mass floors, define energy settings (especially location and building type) and submit an energy simulation to the Autodesk Green Building Studio web service. When an alert appears the simulation is complete and ready for viewing. You can also display multiple simulation results for side-by-side comparisons. Use simulation results to understand building energy use to move your project towards sustainable design.

Energy Analysis for Autodesk Revit 2014 is intended to provide insight into the role of building form (size, shape, orientation, glazing percentages, shading) and materials on potential building energy use from the earliest stages of the design process.

Steps to setup Revit Energy Analysis

Energy analysis panel

Create the Energy Analytical Model

Run Energy simulation

Result & Compare project tree

1. Open the BK4ON4 building model.
2. Sign in to Autodesk 360.
3. Set building elements as the basis for the energy simulation. Click Analyze tab >> Energy Analysis panel >> Use Building Element Mode .
4. Modify the detailed building Energy settings as needed. Go to Energy settings .
5. Click Analyze tab >> Energy Analysis panel >> Run Energy Simulation .
6. In the dialog, select Create the Energy Analytical Model and continue to run the simulation.
7. Click OK, if You are informed when the energy analytical model has been generated.
8. In the Run Energy Simulation dialog, for run name, specify a name for the analysis. Click Continue.
9. When the simulation is complete, an alert displays. Click the analysis name in the alert to view the results.
10. Or, in the Energy Analysis panel, click Results & Compare , and select the analysis from the project tree.
11. Viewing results: In the Results and Compare dialog, click the Results tab to see current and previous simulations.
    • To view a simulation, click its name in the left pane (project tree).
    • To compare multiple simulations, Ctrl-click to select them in the left pane. Then click Compare.
12. Modify the building model as needed, and then run an analysis on the modified model. For example you can change the thickness of the insulation or reduce the window area.
    • If a simulation is not yet finished, the left pane lists the simulation and indicates the percentage done.

Energy settings

Energy settings

Outdoor air information

To see the Energy settings go to the Analyze tab >> Energy Analysis panel >> Energy settings . For the BK4ON4 model these are already been set.

Common

• Building Type: Multi Family
• Location: Borrendammehof, 1069 Amsterdam, Nederland. Use daylight savings time.
• Ground Plane: 00 Level or Level 1

Detailed Model

• Export Category: Rooms (see Rooms above)
• Export Complexity: Simple with shading surfaces
• Include Thermal Properties: Yes

The walls, floors and roofs have to built up out of different layers. In the type properties under structure you can set the material, thickness and function of these layers.

• Project Phase: New Construction
• Sliver Space Tolerance: Default value 304.8 (mm)

A sliver space is a small area in your building model that isn't a Room, like an in plumbing chase wall. If these areas aren't defined as a Room, then Revit will see them as outside walls. If you have openings for plumbing ducts, set the Sliver Space Tolerance to the dimensions of these openings (shafts).

Energy Model

• Analytical Space Resolution: Default value 457.2 (mm)

Specify the size of the largest gap (between two Revit elements) through which analytic spaces will not "leak." If you run an energy simulation and a message displays that the model is too large, increase this setting and rerun the energy simulation.

• Analytical Surface Resolution: Default value 304.8 (mm)

Specifies, in combination with the Analytical Space Resolution, how accurately the boundaries of analytic surfaces match the ideal boundaries. In general, reducing the Analytical Surface Resolution results in analytic surfaces with more accurate boundaries, but this also limits how accurately analytic surfaces are modeled.

• Conceptual Constructions: (Don't change)

(Only relevant for conceptual mass analysis)

Energy Model – Building Services

• Building Operating Schedule: Default
• HVAC System: Residential 14 SEER/0.9 AFUE Split/Packaged Gas <5.5 ton

• Efficient 14 SEER/90% AFUE furnace <5.5-ton split/packaged system with gas heat 
• Residential constant volume cycling fan 
• 2.0 inch of water gauge (498 pascals) static pressure Constant Volume duct system 
• Domestic hot water unit (0.575 Energy Factor) 

The HVAC systems are based on situations in the USA & Australia. A cooling systems is incorporated in every system. This is different from Dutch systems!!

• Outdoor Air information: Air Changes per Hour: 3.

You use the Outdoor Air Information dialog to specify the settings used to calculate outdoor airflow for the zone. Air Changes per Hour for houses can be set between 2 or 5. Deselect other options.

Neutral Energy Building Strategies

To design a neutral energy building, consider the following strategies:

• Modify the Thermal Resistance of the building elements by changing the thermal properties of the wall, floor and roof materials.
• Design the building form, mass, and openings to take full advantage of natural ventilation and daylighting opportunities.
• Incorporate thermal mass if appropriate for the weather and building use.

Modify Thermal Properties for Energy Analysis using Building Elements

Properties Wall (Wand Opbouw ON4)

Edit Type Properties wall

Edit assembly

Material Browser (VIB_Isolatie)

Material Browser - Thermal

All walls, floors and roof consists out of multiple materials and have a specific Thermal Resistance (R). In Dutch this is called: Warmteweerstand (Rc). For the current wall (Wand Opbouw ON4) this is R = 2.0269 (m²*K)/W. If you have a higher Resistance (R) this will give you a lower energy consumption. Try to improve the Resistance (R) to 4 or 5.

You can find the Resistance (R) in the Type properties (see Analytical properties) and in the Edit Assembly (layers).

To modify thermal properties to elements for analysis:

1. Open a view that displays the detailed building model, like a 3D view.
2. Select a building element, such as a wall.
3. On the Properties palette, select Edit Type.
4. For Structure, select Edit.
5. In the Edit Assembly dialog, click in the Material column.
6. In the Material Browser, click the Thermal tab to view and edit thermal properties.
   • edit the Thermal Conductivity, Specific Heat, Density etc.
7. Click Apply and OK to close the dialog.
8. Click OK to close the Edit Assembly dialog.
9. In the Type Properties, under Analytical Properties note that the thermal properties are populated: Heat Transfer Coefficient, Thermal Resistance (R), and Thermal mass.
10. Continue steps 4-10 for each element that you want to include thermal properties for in the energy analysis.
11. Run a new Energy Analysis.

Tip: Modify the glass area in your project and improve the Resistance (R) of Glass, like VIB_Dubbel Glas (vervanging).

For more information go to:

• See above: Revit model types
• Revit Materials
• Thermische_weerstand