stanford- tutorial.pdf

Lab Week-7: May 12, 2011

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EnergyPlus Tutorial Lab Week-7

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• Objectives

– Run an EnergyPlus Simulation

– View results in Excel

– View results in SEE IT

– Edit EnergyPlus input file with IDF Editor

– Edit EnergyPlus input file with spreadsheet

interface

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• Examples

– Input file from EnergyPlus tutorial

• Simple box building

• ECO Temperature Settings

• HOG Temperature Settings

– Simplified Y2E2 spreadsheet interface

• Existing inputs

• Set point calibration

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Open EP-Launch May need to search

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Select input file (.idf)

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Browse

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Pull-down

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Simulate!

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Thinking….

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Success!

Warnings: Generally ignore Severe Errors: Crash – look at error file

16 seconds! Not bad! Not typical!

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View results: Select file type

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View results: Select file type Useful text files: Error RDD

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Error file

Look at Severe Errors: address concerns in editor (Temperature out of range, using wrong syntax, etc)

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List of possible outputs to display More outputs increase run-time

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View results: Select file type Spreadsheets: Meter Output Variable Output

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Building level meter outputs Example: Electricity District Heating District Cooling

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Predicted Monthly Energy Use for Simple Building

with Eco Temperature Set points

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Edit file with IDF Editor

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Save As… Add –Hog to file name Maintains original file

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Control + L

Collapses unused categories

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• From here, we can tweak

the inputs

• Example – look at

temperature settings

• [0009] Schedule:Compact

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ECO Heating Temperature Schedule

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For each day type

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For each day type For all times of the day First time entry – from midnight until entered time “From midnight until 7:00am, temperature will be 15C” • Note oF = (9/5) * oC + 32 ~ 2C + 30

• 15oC ~ 60oF

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For each day type For all times of the day First time entry – from midnight until entered time “From midnight until 7:00am, temperature will be 15C” Additional time entries – from last time until next time “From 7:00am until 5:00pm, temperature will be 20C”

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ECO Cooling Temperature Schedule

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Eco Heating Eco Cooling Hog Heating Hog Cooling

Weekdays:

Until 7am

15 C/59 F 30 C/86 F 22 C/71.6 F 23 C/73.4 F

Weekdays:

Until 5pm

20 C/68 F 25 C/77 F 22 C/71.6 F 23 C/73.4 F

Weekdays:

Until Midnight

15 C/59 F 30 C/86 F 22 C/71.6 F 23 C/73.4 F

Weekends

and Holidays

15 C/59 F 30 C/86 F 22 C/71.6 F 23 C/73.4 F

Design Days 20 C/68 F 25 C/77 F 22 C/71.6 F 23 C/73.4 F

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Creating new heating schedule

Click on ECO HEATING

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Duplicate Object

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New schedule appears

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Double-click or click and type to edit inputs

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Change name to HOG HEATING Change all temperatures to 22 (C)

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Creating new cooling schedule

Repeat process for cooling schedule Select 23 C for all temperatures

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Apply new temperature schedules

Scroll down and select ThermostatSetpoint:DualSetpoint

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Click schedule to see options Select HOG HEATING

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Repeat for cooling

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Asterisk – unsaved Save file Close editor

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Browse

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Select new Hog file

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Simulate!

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View meter output

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Building level meter outputs Example: Electricity District Heating District Cooling

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Simulated Monthly Energy Use for Simple Building

with Hog Temperature Set points

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Simulated Monthly Energy Use for Simple Building

Comparison between Eco and Hog Set Points

250,000,000

500,000,000

750,000,000

1,000,000,000

1,250,000,000

1,500,000,000

1,750,000,000

2,000,000,000

2,250,000,000

)Eco - Electricity:Facility [J](Monthly) Hog - Electricity:Facility [J](Monthly)

Eco - DistrictCooling:Facility [J](Monthly) Hog - DistrictCooling:Facility [J](Monthly)

Eco - DistrictHeating:Facility [J](Monthly) Hog - DistrictHeating:Facility [J](Monthly)

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View in SEE IT

• Open SEE IT

• Create new project

• Add new datasource

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View in SEE IT Browse for SQL database file

Select Hog file

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View in SEE IT

Include high level meter data

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View in SEE IT

Include variable outputs

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View in SEE IT

Timeframe is automatically set to simulation runtime period

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View in SEE IT

Updates any existing datapoints with the same names for objects and plots

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View in SEE IT Select from pull down menu

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View in SEE IT

Monthly meter data 52

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View in SEE IT

Plot variable graphs just like measured data

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View in SEE IT

HOG zone heating and cooling requirements 54

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View in SEE IT

Currently need to open another SEE IT instance to view

other simulation database

ECO temperature set points 55

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View in SEE IT

ECO temperature set points

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Alternative to IDF Editor: Spreadsheet Templates

Uses spreadsheet input format and

macros to compile run file (IMF)

Pre-processor converts to IDF file

for simulation

Improved navigation

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Alternative to IDF Editor: Spreadsheet Templates

Open Y2E2V4 spreadsheet Lab example simulates one day for Y2E2 basic model

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Check paths

Make sure this path corresponds to the correct folder on your machine

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Run macro

Click “Run Macro” on any page to create IDF file

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Open EnergyPlus Launch Browse for Y2E2_Main.imf file in the Y2E2 folder in EnergyPlus Open file Simulate!

Run simulation in EnergyPlus Launch

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VERSION Object Missing!!!!

Click Ok

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Seven minutes for one day simulation of basic model!

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Look at Main Meter spreadsheet

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Utility usage for each meter for the RunPeriod (February 1st)

0.00E+00

5.00E+09

1.00E+10

1.50E+10

2.00E+10

2.50E+10

DistrictCooling DistrictHeating Electricity

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View in SEE IT

Open new instance of SEE IT Create new project Add new EnergyPlus datasource Select Y2E2_Main

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View in SEE IT

Check boxes Change default year to match year for desired measured data

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Compare Rep Office 393 Set Points Pull down simulation database

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Compare Rep Office 393 Set Points

Filter

Add cooling set point (3576) Add heating set point (3575)

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Compare Rep Office 393 Set Points

Filter

Add cooling set point (1735) Add heating set point (17320008)

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S: Simulated M: Measured

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Significant energy savings may be achieved

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Change schedule to see impact

Open SchedulesY2E2_ArupModel.idf in IDF Editor or Text Editor

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Change schedule to see impact

“Find” BldgHeat Copy Paste below

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Edit first few lines to set heating temperature to 71 F year round Rename to BldgHeatHog Delete the rest of the lines

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Repeat for cooling Copy BldgCool Paste Below Edit first few lines to set cooling temperature to 76 F year round Rename to BldgCoolHog Delete the rest of the lines Save File Can also be done in IDF Editor 76

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• Return to Spreadsheet

• Save as Y2E2V4Hog

• Change main run file from

Y2E2_Main to Y2E2_Main_Hog

• Always save intervention as new

file to preserve previous work

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Go to zones tab Find and Replace all BldgHeat with BldgHeatHog Find and Replace all BldgCool with BldgCoolHog

General building heating and cooling schedules 78

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CNTL+F Click Replace tab

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Find BldgHeat

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Replace with BldgHeatHog

Repeat for cooling

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Find a “Run Macro” button and click

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Open imf file Simulate!

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0.00E+00

5.00E+09

1.00E+10

1.50E+10

2.00E+10

2.50E+10

DistrictCooling DistrictHeating Electricity

)Original Set Points Hog Set Points

Predicted Energy Consumption in Y2E2 on February 2nd

Not much of a difference…Check set points in SEE IT

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Slight difference from rounding

Set points match – need to explore over larger periods of time

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Files Tab

Which input files are used? Where are they located? Mostly leave this alone Unless path changes or To change main run file name

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Global Parameters

Global default values Overridden if defined elsewhere Several calculation methods Lighting – W, W/area, etc Not likely needed

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Defines which schedules used in the zones Defines maximum lighting and equipment wattages, occupancy, infiltration, etc (Look for _Variable suffix) Refer to Global Parameters for unit definitions Will need this page Update schedules in IDF Editor or Text Editor

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Zone Types

Adjust zone ventilation, mixing and radiant floors May need

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Air Loops

Change settings for AHUs May need, depending on intervention

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Chilled Water Loops

Adjusts settings for Chilled water loop May need (if changing temperatures, etc) For all sheets, do not alter blue boxes!

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Hot Water Loops

Adjusts settings for hot water loop May need (if changing temperatures, etc)

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CondWaterLoops

WaterCompLoops

CompTypes

Not needed

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A few more editing tips

• Various idf files in UserDefinedFiles can be altered for

interventions

• Look at Files tab to see what’s being used

• For example: spreadsheet currently using

“ScheduelsY2E2_ArupModel” and “MoreSchedules” for

various schedules

• Run Period can be changed in “Y2E2_V17.6_V2”

• Be careful when editing spreadsheet – ask questions

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General EnergyPlus Tips

• Additional weather data can be found here:

http://apps1.eere.energy.gov/buildings/energyplus/weat

herdata_about.cfm

• You can download EnergyPlus for free on your own

computers

– Make sure you grab the correct files from

CourseWork

– Make sure EnergyPlus is installed directly onto C:

drive, not Program Files

– Make sure paths are correctly aligned in

spreadsheet

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Query 7

• Compare simulated data for a simple building given

different assumptions, using e+ and its UI:

a. With and without significant (assumed) lab and

server load;

b. 24/7 vs. 9 hour/day x 5day/week occupancy.

• Compare measured and predicted data for Y2E2:

a. 24/7 vs. 9 hour/day x 5day/week occupancy vs.

current measured building performance data;

b. Current measured building performance data vs.

predicted data given an operating intervention that

seems interesting to you.

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