Introduction to EnergyPlusrto/CursoEplus/EPlus-Intro-2Day...Nov 2008 Introduction to EnergyPlus...

Introduction to EnergyPlus

Material prepared by GARD Analytics, Inc. under contract to the U.S. Department of Energy. All material Copyright 2002-2008 U.S. Department of Energy - All rights reserved.

Nov 2008 Introduction to EnergyPlus - Part 1. Copyright 2002-2008 U.S.D.O.E. 2

Acknowledgements

The following organizations have contributed to the development of this workshop:� U.S. Department of Energy – D.B. Crawley, Program Manager

� GARD Analytics – M.J. Witte, T.L. Cornell, R.H. Henninger

� University of Illinois at Urbana-Champaign – R.J. Liesen, C.O. Pedersen, R.K. Strand

� U.S. Army Corps of Engineers, Construction Engineering Research Laboratories – L.K. Lawrie

� Lawrence Berkeley National Laboratory – W.F. Buhl, F.C. Winkelmann

� Current funding - National Energy Technology Laboratory (NETL) under award number DE-FC26-06NT42768 by subcontract through the University of Central Florida/Florida Solar Energy Center

� Prior funding – National Renewable Energy Laboratory (NREL) and Lawrence Berkeley National Laboratory (LBNL)


EnergyPlus Team

� U.S. Department of Energy, DC

� Lawrence Berkeley National Laboratory, CA

� National Renewable Energy Laboratory, CO

� Oak Ridge National Laboratory, TN

� Florida Solar Energy Center, FL

� GARD Analytics, IL

� DHL Consulting, CO

� University of Illinois at Urbana-Champaign, IL

� COP Associates, MN

� Oklahoma State University, OK


Part 1 – EnergyPlus Overview


Part 1 Outline

�EnergyPlus Background and Concepts

�Structure and Simulation Managers

�Features and Capabilities

�EnergyPlus Components

�Input and Output

�User Interfaces

�Energy Design Plugin


Version Status

�Current version 3.0.0, November 2008

�Twice yearly updates—April and October

�Workshop Materials

� Primarily 3.0.0

� Some previews of future versions


What is EnergyPlus?

�Fully integrated building & HVAC simulation program

�Based on best features ofBLAST and DOE-2.1E plus new capabilities

�Windows 2000/XP/Vista, Linux, Mac

�Simulation engine only

� Interfaces available separately

� Info at www.energyplus.gov


EnergyPlus Concepts

�Simple input/output file structures

�No surface, zone or system limits � Defaults to 50 zones per air handler and 100 coils per plant loop, but this can be increased by editing master file (IDD)

�Other software linked in� AIRNET, multi-zone air flow combining wind-induced flow and air distribution system

� DElight complex daylighting

� Slab & Basement, 3-d heat transfer preprocessor

� SPARK, general differential/algebraic equation solver (limited at this point)


EnergyPlus Structure

Third-PartyUser

Interfaces

Update

Feedback

Zone

Conditions

Heat andMass

BalanceSimulation

BuildingSystems

Simulation

Building Description

Calculation Results

Da t

a

EnergyPlusSimulation Manager

Dat

a

Dat

aD

ata

Dat

a

DescribeBuilding

DisplayResults

Dat

aWindow 5Calcs

AirflowNetwork

Ground HtTransfer

FutureModules

SPARK

PollutionModels

On-SitePower

FutureModules


Loads Features and Capabilities

�Time dependent conduction� Conduction through building surfaces calculated with conduction transfer functions

� Heat storage and time lags

� Finite difference, with variable properties to model phase-change materials

�Sub-hourly time steps� Default is four 15-minute timesteps per hour

�Room air models� Default is “well-stirred” with uniform temperature

� Other options: displacement vent, cross vent, UFAD, Mundt, user-defined temperature patterns


Loads Features and Capabilities (cont’d)

�Room surface heat transfer:� 1-D heat transfer

� Conduction transfer functions account for thermal mass (default)

� Optional conduction finite-difference model

� Uniform surface temperatures

� Uniform long and short wave radiation

� Diffuse radiating and reflecting surfaces

� Internal heat sources (optional)

� Chilled beams in development


Loads Features and Capabilities (cont’d)

�Moisture transfer models

� Effective Moisture Penetration Depth (EMPD)

� Simplified moisture model

�Moisture absorbed/released, no transport through surfaces

� Estimates moisture interactions between the space air and interior surfaces and furnishings


HVAC Features and Capabilities

�Flexible specification of HVAC equipment� Components arranged on loops

� Not limited to predefined system configurations

�“HVACTemplates” for standard system configurations

�More than one system may serve a zone� e.g. Dedicated outside air system plus fan coil units

�Some component algorithms based on DOE-2.1E and BLAST


Integrated Simulation Manager

� Simultaneous simulation of loads, systems and plant

� Air and water loops are solved iteratively at each time step, not a single-pass calculation as in DOE-2.1E, BLAST, and other hourly simulation tools

� Provides tighter coupling between the air- and water-side of the system and plant

� Allows capacity limits to be modeled more realistically

� Loads “not met” result in zone temperature and humidity changes


Does Anyone Really Use EnergyPlus?

�72,000+ copies downloaded since April 2001 (including all releases).

�Typically 7,000 copies per release.

�More than 120 countries

�Over 1,700 people on EnergyPlus_Support list.

�High profile projects…


San Francisco Federal Building


Early Freedom Tower DesignWTC, New York


Environmental Emissions

Maximum: 43,727.1 kg

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

45,000

50,000

CO

2

An

nu

al E

mis

sio

ns,

kg

Chicago, Illinois

0.0

50.0

100.0

150.0

200.0

250.0

CO

CH

4

NO

x

N2O

SO

2

PM

PM

10

PM

2.5

NH

3

NM

VO

C

Maximum: 206.496 kg

An

nu

al E

mis

sio

ns,

kg

1990LowMediumHigh

Maximum: 0.8101 g

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

0.900

Hg

Pb

An

nu

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g

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100

200

300

400

500

600

Wat

er

Wat

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se in

Ele

ctri

city

Gen

erat

ion

, th

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san

ds

of

m3

Maximum: 43,727.1 kg

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

45,000

50,000

CO

2

An

nu

al E

mis

sio

ns,

kg

Chicago, Illinois

0.0

50.0

100.0

150.0

200.0

250.0

CO

CH

4

NO

x

N2O

SO

2

PM

PM

10

PM

2.5

NH

3

NM

VO

C

Maximum: 206.496 kg

An

nu

al E

mis

sio

ns,

kg

1990LowMediumHigh

Maximum: 0.8101 g

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

0.900

Hg

Pb

An

nu

al E

mis

sio

ns,

g

0

100

200

300

400

500

600

Wat

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Wat

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, th

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EnergyPlus Components

Installing EnergyPlus

EnergyPlus Folders

Shortcuts

Documentation


Installing EnergyPlus

�After installation the EnergyPlus directory will contain the following subdirectories (if default components are selected):

� BACKUP

� DataSets

� Documentation

� Example Files

� MacroDataSets

� PostProcess

� PreProcess

� sparklink

� WeatherData


DataSets and MacroDataSets Folders

� DataSets – Predefined Objects� Materials

� Constructions

� Schedules

� Chillers

� Holidays

� and more

� MacroDataSets� ##if blocks for parametric batch runs

� Utility rate tariffs and emissions factors for 37 utilities (2000-2005 data)


Documentation Folder

�Documentation� User & Developer Documentation

� Bookmarks to Navigate

� Searchable & Indexed

� PDF Format

� Adobe Reader 8.0 or higher recommended (www.adobe.com)

� Requires Adobe Reader 7.0 minimum


Documentation

� Documentation Main Menu

� C:\EnergyPlusV2-2-0 \Documentation\EPlusMainMenu.pdf

� Start � Programs �EnergyPlus V2-2 Programs � EnergyPlus Documentation Main Menu

� User & Developer Documentation

� Indexed –“Press to Search Documents”


ExampleFiles Folder

� Dozens of example inputs

� Named by key feature, 5ZoneSupRetPlen.idf = “5 zone system with supply and return plenum”

� ExampleFiles.xlsTable of key features

� Many concepts bestlearned by example

� BasicsFiles – tutorial examples, see “Getting Started” doc


WeatherData Folder

�EPW WeatherData� 5 locations included in standard install

� Download additional EPW weather files at www.energyplus.gov

� Nearly 2000 sites available worldwide

� DDY Files� ASHRAE Design Days and Location in EnergyPlus syntax

� Included in weather zip files from www.energyplus.gov


Weather Data(epw file)

�Weather year for energy use comparisons

�Hourly data typical, can be subhourly

�Can be less than a full year

�Data include temperature, humidity, solar, wind, rain and snow flags, etc. precipitation amounts coming soon,

� Interpolated for EnergyPlus time steps� Solar values are mid-hour average or total

� All other values are on-the-hour instantaneous

� Linear interpolation for each time step


Available EPW Weather Files

�Several included in standard install

�Download other locations from web sitehttp://www.energyplus.gov/cfm/weather_data.cfm

� USA locations � TMY3 & CTZ, with a few TMY2 and TMY

� Over 1000 sites

� Canadian locations� CWEC

� 72 sites

� International locations � TMY2, TMY, ASHRAE IWEC, CIBSE*, CSWD, CTYW, ETMY, IGDG, INETI, ISHRAE, KISR, RMY, SWEC, SWERA & Technion

� Nearly 900 sites worldwide *available only from CIBSE


Start Menu Shortcuts

�Start � Programs �EnergyPlus V3-0 Programs

�Documentation Main Menu

� Docs Menu Page

�EP-Launch

� Easy-to-Use Run Tool

� IDFEditor

� Input File Editor


Start Menu Shortcuts (cont’d)

�Readme

�Transition . . .� Convert old inputs

�Uninstall

�Weather Converter� Process Weather Data

� Create Weather Reports

�WinEPDraw� DXF drawing without simulation


Input and Output

General Philosophy

Input/Output Files

Overall File Structures

Input Object Structure

Weather Files


General Philosophy of Input/Output/Weather

�Designed for interfaces yet human readable

�Simple, free-format text files

�Comma-separated

�“Object-based”

�Somewhat self-documenting

�SI units only – interfaces handle conversions

�Two parts—dictionary and data� For input: 2 files (*.idd and *.idf)

� For output: 1 file with dictionary and output data

�Designed for easy maintenance & expansion


Input/Output Files

Input Data DictionaryThis file is created byEnergyPlus developers.

Input Data File

This file will be createdby UserObject,data,data,…,data;Object,data,data,…,data;

Input Data Dictionary(IDD)

EnergyPlus ProgramMain Program

Module

Module

Module

Module

Module

Module

File Types:Standard ReportsStandard Reports (Detail)Optional ReportsOptional Reports (Detail)InitializationReports

Overview of File Format:HeaderData DictionaryData

Note: These files will be created by EnergyPlus.

Output Files

Out

put

Pro

cess

or

Input Data File (IDF)


Sources of Input Data

�User interfaces and other utilities

�CADD programs� Trace over DXF in some EnergyPlus interfaces

� Energy Design Plugin for Google Sketchup

� Green Building Studio (gbxml) recently acquired by Autodesk – timetable unknown

� Graphisoft ArchiCad direct export later in 2008

� Bentley acquired HEVACOMP and is investigating direct link from MicroStation

�Window5 (window thermal and optical data)windows.lbl.gov/software/window/window.html

�BLAST and DOE-2.1E partial translators


EnergyPlus Private Sector User Interfaces

EP-Quick

BEE BEE (Chinese)(Chinese)TREAT PlusCOMFENESP-r EnergyGaugeEPlusInterfaceHVAC EnergySolarShoeBoxxEsoViewothers, ….

PV modeling by EnergyPlus

EFEN

ECOTECT


Other User Interfaces and Utilities

�EnergyPlus Example File Generator� Web form

� Create generic buildings

� Submit and run remotely

� Input and output via e-mail

�Current interface and utilities list www.energyplus.gov/interfaces_tools.html


Energy Design Plugin

�SketchUp � Intuitive 3-D drawing software

� Available from Google as free or pro versions

�Plugin adds EnergyPlus functionality to the SketchUp 3-D environment� Create/Edit EnergyPlus Input Files

� Run EnergyPlus and view results

� Automatically create prototype and code compliance building models (future v1)


Energy Design Plugin for SketchUp

�Developed by NREL

�Still in development

�Beta version released early April – now more than 500 downloads

�Available for free at www.energyplus.gov

�Works with free and pro versions of SketchUp

�Available for Windows initially (Mac later)


Energy Design Plugin beta Version

�Create and edit building geometry with standard SketchUp drawing tools

�Save as EnergyPlus input file (idf)

�Opens any EnergyPlus idf file

�Run EnergyPlus simulation and display results


Energy Design Plugin Future Versions

�Automatic prototype or compliance models

�Manage and edit most simulation inputs

�Ultimately “simulation for everyone”

� Engineers

� Architects

� Homeowners


Open/Edit an Input File


Edit a Zone


Info Tool


Run Simulation


Run Simulation

Introduction to EnergyPlusrto/CursoEplus/EPlus-Intro-2Day...Nov 2008 Introduction to EnergyPlus...

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Transcript of Introduction to EnergyPlusrto/CursoEplus/EPlus-Intro-2Day...Nov 2008 Introduction to EnergyPlus...