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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.

Energy Modeling - VDTA Best Practices  

Working closely with Robert Webber, I helped VDTA develop a strategy to incorporate energy modeling early in their design process, to easily...