ENERGY MODELING: VDTA Best Practices
Introduction
The Revit Model Revit to IES
Energy/Carbon Simulations VE-Gaia
ENERGY MODELING: VDTA Best Practices
The Big Picture Introduction
The Revit Model Revit to IES
Energy/Carbon Simulations VE-Gaia
Energy Modeling can help us make performancebased decisions early in the design process by understanding the real impacts that our choices have on the energy use of our building. It can be especially useful to quickly analyze and compare different design strategies based on their energy use intensity.
Introduction
The Revit Model Revit to IES
Energy/Carbon Simulations
Iterative Process
VE-Gaia
An energy model is a powerful tool – but only if it fits into the fast-paced work flow of a design team. We will highlight how to use the energy modeling software IES simultaneously with Revit during a project’s development.
IES-VE: Integrated Environmental Solutions – Virtual Environment From an early stage, VDTA Revit models typically have a clear idea of the general layout of rooms and square footages. This level of detail demands a more robust analysis tool than those built into Revit. IES-VE provides a greater range and depth of simulation power and fits the workflow of VDTA.
IES-VE: Tool for Design The strength of IES is as a comparison tool. Its value lies in the ability to change one parameter while holding others constant to determine the relative effects of a specific strategy . Comparing “apples to apples�
Introduction: IES-VE IES thinks in rooms. What does it need to know about a room?
?
Are there people in it? How many?
IES-VE: Rooms IES thinks in rooms. What does it need to know about a room?
What are they doing? At what time?
HOW DO I TELL IES THE ANSWERS TO THESE QUESTIONS?
For how long?
What are its surfaces made of?
What is the shape of the room?
?
Are there people in it? How many?
IES-VE: Rooms IES thinks in rooms. What does it need to know about a room?
What are they doing? At what time?
HOW DO I TELL IES THE ANSWERS TO THESE QUESTIONS?
For how long?
What are its surfaces made of?
What is the shape of the room? CONSTRUCTION TEMPLATE
?
THERMAL TEMPLATE
Are there people in it? How many?
IES-VE: Rooms IES thinks in rooms. What does it need to know about a room?
What are they doing? At what time?
HOW DO I TELL IES THE ANSWERS TO THESE QUESTIONS?
For how long?
What are its surfaces made of?
What is the shape of the room? CONSTRUCTION TEMPLATE
?
Introduction
The Revit Model Revit to IES
Energy/Carbon Simulations VE-Gaia
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions DETACH
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT
Revit to IES: Import
Revit to IES: Import
Revit to IES: Import
Revit to IES: Import
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL
IES-VE: The Basics IES is a program made up of smaller applications The most important applications to familiarize yourself with will be: 1. ModelIT (Application) – Physical Geometry 2. Apache (Application) – Thermal Properties 3. VE-Gaia (Navigator) – Energy Analysis You should also be comfortable using: 1. Building Template Manager 2. Apache Construction Database Manager
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
BUILDING TEMPLATE MANAGER
Building Template Manager: Thermal
BUILDING TYPE
Building Template Manager: Constructions
BUILDING CONSTRUCTION
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
BUILDING TEMPLATE MANAGER
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
BUILDING TEMPLATE MANAGER ASSIGN TEMPLATE TO MODEL
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
BUILDING TEMPLATE MANAGER ASSIGN TEMPLATE TO MODEL
TESTING VE-Gaia
NETWORK
LOCAL
REVIT MODEL
Set Room Conditions IMPORT IES ENERGY MODEL MODELIT
BUILDING TEMPLATE MANAGER ASSIGN TEMPLATE TO MODEL
TESTING VE-Gaia
MODEL CHANGES
NETWORK
PROJECT TEAM 1
PROJECT TEAM 2 LOCAL
REVIT MODEL
LOCAL
Set Room Conditions
REVIT MODEL
IMPORT
Set Room Conditions IMPORT
IES ENERGY MODEL
IES ENERGY MODEL
MODELIT
MODELIT
ASSIGN TEMPLATE TO MODEL
ASSIGN TEMPLATE TO MODEL
TESTING VE-Gaia
TESTING VE-Gaia
BUILDING TEMPLATE MANAGER
MODEL CHANGES
MODEL CHANGES
Introduction
The Revit Model Revit to IES
Energy/Carbon Simulations VE-Gaia
Simulation Time: 15-20 min
Run an Energy/Carbon Simulation Navigators > VE-Gaia > Building energy/carbon > Select shading method and simulate Use this to achieve: 1. Proposed Energy Use Intensity 2. Proposed Carbon Intensity 3. Thermal Comfort 4. Total Energy • Per Room • Per Month
VE-Gaia: 2030 Challenge
Energy Star Target Finder
Energy goals for proposed building type
Energy goals for proposed building type
RESIDENCE HALL/DORMITORY: Average Building Energy Use Intensity: 58 kBtu/ft2/yr
RESIDENCE HALL/DORMITORY: Median Property Site EUI: 55.8 kBtu/ft2/yr
CHALLENGE TARGETS: Current (60% reduction) 2015 (70% reduction) 2020 (80% reduction) 2025 (90% reduction) 2030 (100% reduction)
– EUI 23 – EUI 18 – EUI 18 – EUI 18 – EUI 0
EXAMPLES
Compare: Envelope Baseline Energy Use Intensity: 52 kBtu/ft2/yr Carbon Use Intensity: 10.75 lbCO2/ft2
Baseline + Glass roof on 4th floor Corridors, Floor Lounge and Stairway Energy Use Intensity: 56 kBtu/ft2/yr Carbon Use Intensity: 11.52 lbCO2/ft2
Compare: Envelope Baseline Energy Use Intensity: 52 kBtu/ft2/yr Carbon Use Intensity: 10.75 lbCO2/ft2
Baseline minus 60% window area North facade Energy Use Intensity: 52 kBtu/ft2/yr Carbon Use Intensity: 10.70 lbCO2/ft2
Baseline Heating Energy (Mbtu): 933.4 Cooling Energy (Mbtu): 292.1 EUI (kBtu/ft2/yr): 52
South Facade
North Facade
Flipped Bed/Bath
N
Heating Energy (Mbtu): 940.7 Cooling Energy (Mbtu): 292.5 EUI (kBtu/ft2/yr): 52
South Facade
North Facade
Example Test Flow Change a single parameter for each test
Baseline
+ Shading
+ Insulation
+ Efficient Lighting
+ Skylights
1200 1000 800 600
Heat
400
Cool
200 0 baseline
(+)shading
(+)insulation
(+)efficient lighting
(+)skylights
800 700 600 500 Fans/Pumps
400
Lights
300
Equipment
200 100 0 baseline
(+)shading
(+)insulation
(+)efficient lighting
(+)skylights
EUI
60 BENCHMARK
50
40
30 CURRENT 2030 TARGET
20
10
0 baseline
(+)shading
(+)insulation
(+)efficient lighting
(+)skylights
Valerio Dewalt Train Associates
BUILDORDIE.COM
ENERGY MODELING: VDTA Appendix
Revit to IES Import Building Template Manager Master Templates Edit Constructions Modeling in IES Assign to Model Common Errors
ENERGY MODELING: VDTA Appendix
Revit to IES: Import
Revit to IES: Import
Revit to IES: Import
Revit to IES: Import
Building Template Manager Construction Templates (Building Construction) • Materials Thermal Templates (Building Type) • Occupancy • Heating/Cooling • Systems • Internal Gains • Air Exchanges Profiles (APpro)
Set Room Conditions
ACCESS THE BUILDING TEMPLATE MANAGER HERE:
Building Template Manager Construction Templates (Building Construction) • Materials Thermal Templates (Building Type) • Occupancy • Heating/Cooling • Systems • Internal Gains • Air Exchanges
Construction templates relate to your choice of Building Construction. You also chose initial settings for Building Constructions during the import. These can be viewed and changed from the Constructions tab in building template manager as well. Thermal templates relate to the Building Type you chose. When you chose a building type in the Import dialogue, it affected setting for Room Conditioning, Mechanical System, Internal Gains, and Air Exchanges in IES. You can use the Thermal tab in building template manager to look at those in greater detail and change them if needed.
Profiles (APpro)
ACCESS THE BUILDING TEMPLATE MANAGER HERE:
Building Template Manager: Thermal
BUILDING TYPE
Building Template Manager: Thermal
Room Conditions
Building Template Manager: Thermal
Mechanical Systems
Building Template Manager: Thermal
Internal Gains
Building Template Manager: Thermal
Air Exchanges
Building Template Manager: Thermal
Room Conditions
APpro
IES-VE: Apache Profiles Database YEARLY PROFILES are defined by Weekly profiles WEEKLY PROFILES are defined by Daily profiles DAILY PROFILES are defined by Hourly values
ACCESS THE DATABASE ANYWHERE YOU SEE THIS ICON:
IES-VE: Apache Profiles Database Profiles describe the time variation of thermal input parameters. These variations (schedules) determine internal loads from: •Occupancy •Lighting •Equipment •Cooking, etc. EXAMPLE: Daily Schedule – Retail Lighting Profile types: ABSOLUTE – a specific value (i.e. temp, set point) MODULATING – a percent (expressed as 0-1)
Building Template Manager: Constructions
BUILDING CONSTRUCTION
Build/Edit Constructions Building Template Manager > Constructions > Apache Constructions Database > Add/Edit APcdb
Wall Partition Ground Roof Floor/Ceiling Door Glazed
Add/Edit
APcdb
IES-VE: Apache Construction Database Manager > Constructions > APcdb Define Constructions for: •Walls •Partitions •Glazing •Roof/Floors
Edit Construction ACCESS THE DATABASE ANYWHERE YOU SEE THIS ICON:
Build/Edit Constructions
1. 2. 3. 4. 5.
Choose from System Materials Copy and Close Paste material into wall construction Adjust material thickness Change physical properties if known values are different (Density, Thermal capacity, Thermal resistance, etc.)
Assign Construction Templates
ModelIT
Select Rooms
Assign Thermal Constructions
Select and “Replace”
Assign Thermal Templates
Apache
Select Rooms
Assign Room Thermal Template
Make Selection
Import Master Templates Network Location: Y:\buildGREENordie\06_Energy Modeling\IES
Local drive>VDTA Templates>.tpl file Copy to Local Drive
Open Project
Import Master Templates
Choose Import Location and select Templates
Assign templates to spaces
Import Master Templates TO IMPORT A SHARED TEMPLATE: Location: Y:\buildGREENordie\06_Energy Modeling\IES 1. 2. 3. 4.
5. 6.
Copy the VDTA Templates folder to your local drive Open your project in IES Tools > Master Templates > Master Template Wizard Use the Advanced Import option and choose the .tpl file from VDTA Templates folder (local copy) Select items to copy Assign templates to spaces from Apache
LOCAL
NETWORK
Edit a Master Template TO CREATE OR EDIT A SHARED TEMPLATE: 1. 2.
3. 4.
Open the VDTA Templates project from the Y:\ location As a team, decide what material constructions and schedules will be used in your project Add them to the database (see Edit Construction page) Save the project
Discuss as a team: STRUCTURE / MATERIALS TARGET U-VALUES
CONSTRUCTION TEMPLATES
Your template is now available for other teams to access from the network SCHEDULES OF USE MECHANICAL SYSTEMS SPACE CONDITIONING / SET POINTS
THERMAL TEMPLATES
Run an Energy/Carbon Simulation Navigators > VE-Gaia > Building energy/carbon > Select shading method and simulate
Slab on Grade R-value: 4.76 Energy Use Intensity: 54 kBtu/ft2 Carbon Use Intensity: 11.32 lbCO2/ft2
Slab on Grade R-value: 8.88 Energy Use Intensity: 52 kBtu/ft2 Carbon Use Intensity: 10.71 lbCO2/ft2
Slab on Grade R-value: 17.12 Energy Use Intensity: 50 kBtu/ft2 Carbon Use Intensity: 10.34 lbCO2/ft2
Total Energy (Mbtu) 2,750.00 2,700.00 2,650.00 2,600.00
Slab on Grade R-value: 25.36 Energy Use Intensity: 50 kBtu/ft2 Carbon Use Intensity: 10.23 lbCO2/ft2
Total Energy (Mbtu)
2,550.00 2,500.00
2,450.00 2,400.00
1"
2"
4"
6"
Modeling in IES Basic navigation in ModelIT takes place on three different levels, with different options available at each level. For example in the first two, assign different assemblies to the walls, floors, and ceilings, and on the third level you can add openings and windows.
LEVEL 1: Building
LEVEL 2: Room
LEVEL 3: Surface
Step down – Level 3: Surface
Modeling in IES: Create Openings Different types of openings: 1. Vertical opening – between floors 2. Horizontal opening – between rooms (allows free air movement) WHERE THIS TOOL IS USED: Floor Openings for Stairways Floor Openings for Shafts or Chases Half walls
Add Hole (Polygonal)
Internal openings should be modeled in IES-VE instead of Revit for better translation
+
Draw Geometry
Common Errors ERROR: Missing surfaces, or Floor/Ceiling ratio > 1.0 As the project progresses and wall constructions change, room bounding elements may no longer line up from floor to floor. This can cause missing surfaces or errors like the one on the right. SOLUTION: Double check the alignment of room bounding elements adjacent to the room – above, below, and each side.