stanford- tutorial.pdf
TRANSCRIPT
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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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Select input file (.idf)
Browse
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Select input file (.idf)
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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RDD
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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Meter
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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ECO Heating Temperature Schedule
For each day type
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ECO Heating Temperature Schedule
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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ECO Heating Temperature Schedule
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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Creating new heating schedule
Duplicate Object
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Creating new heating schedule
New schedule appears
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Creating new heating schedule
Double-click or click and type to edit inputs
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Creating new heating schedule
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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Apply new temperature schedules
Click schedule to see options Select HOG HEATING
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Apply new temperature schedules
Repeat for cooling
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Apply new temperature schedules
Asterisk – unsaved Save file Close editor
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Select input file (.idf)
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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Meter
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
0
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
Janu
ary
Febru
ary
Mar
chApr
il
May
June
July
Augus
t
Septe
mbe
r
Octob
er
Nov
embe
r
Dec
embe
r
En
erg
y U
se
(J
ou
les
)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
En
erg
y U
se
(J
ou
les
)
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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
En
erg
y U
se
(J
ou
les
)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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Zones
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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