Lecture Material Courtesy of Vladimir Bazjanac (LBNL)

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1 Lecture Material Courtesy of Vladimir Bazjanac (LBNL)

components Semi-automated BEP simulation Example: GSA Headquarters building

2 Today What is simulation Types of simulation models Energy performance simulation EnergyPlus model architecture How to get EnergyPlus software BEP simulation components Semi-automated BEP simulation Example: GSA Headquarters building Summary of simulation results Optimum Process for Simulation practice This weeks assignment

3 What is Simulation Merriam-Webster Dictionary On-line The imitative representation of the functioning of one system or process by means of the functioning of another <a computer simulation of an industrial process> Computer Simulation A digital representation of some aspect of reality that can be quantitatively manipulated Intent/purpose of simulation Visualize Predict Compare Decide Learn and understand better Document Communicate

4 Types of Simulation Models Conditions under which decisions are made Certainty Risk Uncertainty Nature of change in the status of the model Deterministic Stochastic Sequence of change in the status of the model Continuous Discrete Calculating changes in the status of the model Uniform time unit Event oriented

5 Energy Performance Simulation Approximate definition (GARD Analytics, Inc.): Computer modeling of the energy processes within a building that are intended to provide a thermally comfortable environment for the occupants (or contents) of a building. A better definition of BEP simulation Simulation of thermal behavior of a building Buildings are Stochastic, continuous and event oriented systems Available building thermal simulation models are Deterministic, discrete and uniform time unit models Examples of building thermal simulation models EnergyPlus, Energy-10, BLAST, DOE-2, esp-r, TRNSYS, etc.

6 Unavoidable in BEP Simulation Subjective decisions Assumptions Approximations Simplification Work-arounds Subjective interpretation

7 EnergyPlus Model Architecture Custom Interface #1 Custom Interface #2 DOE-2 or BLAST Input File Loads Add-On Modules Daylighting COMIS Airflow Airflow Ground HT Comfort Input Data Calculation Heat Balance Loads Module HVAC Module HVAC Add-On Modules SPARK MODSIM TRNSYS Plant Sys Modules Other Output Data Reporting and Postprocessing Agents Energy Cost IAQ Water Pollution Other By Copyright courtesy of Vladimir EnergyPlus Bazjanac/LBNL team 2009

8 Input-Output Reference Manual

9 Download EnergyPlus EnegyPlus v download InputOutput reference manual ~EnergyPlusV4-1-0\Documentation\InputOutputRefrence.pdf

10 BEP Simulation Components architectural design mechanical design SOURCE OF INFORMATION building program Thermal view Space boundaries Columns Ext. shading Thermal properties of construction materials HVAC systems & plant data sets DATA TRANSFORMATION thermal view geometry materials, constructions & glazing internal loads HVAC systems & plant operating schedules run control INPUT PREP TASKS IDF file simulation engine

11 Example: IDF file

12 Semi-Automated BEP Simulation architectural design mechanical design SOURCE OF INFORMATION building program Thermal view Space boundaries Columns Ext. shading Thermal properties of construction materials HVAC systems & plant data sets DATA TRANSFORMATION thermal view geometry materials, constructions & glazing internal loads HVAC systems & plant operating schedules run control INPUT PREP TASKS IDF file simulation engine

13 Base Case Building

14 75% 100% Alt. 1 Reduced Window Size All windows, except for curtain walls, reduced vertically 25% TYPICAL SECTIONS FULL HEIGHT REDUCED HEIGHT

15 Alt. 1 Reduced Window Size

16 Alt. 2 Exterior Shading Reduced size windows on south facing façade Reduced size windows on west facing façade 2-9/64 (2.031 ) overhang overhang fin 2-9/64 (2.031 ) fin 3-0 WINDOW ELEVATION TYPICAL SECTION

17 Alt. 2 Exterior Shading

18 Alt. 3 High Performance Glass Double pane Low-E clear glass with Krypton

19 Alt. 4 Cool Roof By courtesy Copyright of he Building Vladimir Energy Bazjanac/LBNL Analysis Group, 2009 LBNL

20 Example of output: XLS file

21 Simulation Results Summary

22 Semi-Automated BEP Simulation 1 model based CAD tool 3 6 other design or other analysis design tools or other analysis design tool or analysis tool 4 IFC file Geometry Simplification Tool 5 2 IDF Generator IDF syntax 7 library of materials BIM 19 other analysis other tools analysis other analysis other tools tools analysis tools 10 manufacturer s IDF IDF data file file base 12 other data 13 IDF editor 8 IDF file 11 IFC HVAC interface to E+ 9 HVAC design GUI 14 simulation engine IDF IDF ODF file file file postprocessing 15 DXF file 16

BEP-BIM Simulation Environment HVAC design GUI tools not BIM-conformant building program BIM: architectural design HVAC design ORIGINAL SOURCE OF

into zones HVAC system & plant size, capacity, control and performance RULE BASED DATA TRANSFORMATION internal loads materials, constructions &

23 BEP-BIM Simulation Environment HVAC design GUI tools not BIM-conformant building program BIM: architectural design HVAC design ORIGINAL SOURCE OF HAP INFORMATION Right-Suite Trace TRNSYS BU GUI use schedules GST thermal properties of construction materials thermal view: drag-and-drop spaces into zones HVAC system & plant size, capacity, control and performance RULE BASED DATA TRANSFORMATION internal loads materials, constructions & glazing thermal view geometry HVAC systems & plant operating schedules run control INPUT PREPARATION TASKS IDF file weather data simulation engine

24 This Week s Assignment Assess systems behavior related to setpoints Begin with schedules

25 Questions? Thank you!

AN ASSESSMENT OF THE USE OF BUILING ENERGY PERFORMANCE SIMULATION IN EARLY DESIGN. Berkeley, CA, 94720, U.S.A. Stanford, CA , U.S.A.

AN ASSESSMENT OF THE USE OF BUILING ENERGY PERFORMANCE SIMULATION IN EARLY DESIGN Vladimir Bazjanac 1, Tobias Maile 1, Cody Rose 1, James T. O Donnell 1, Nataša Mrazović 1, Elmer Morrissey 1 and Benjamin