A User’s Perspective on IES Modeling - Energy Trust of ... · PDF fileA User’s...
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A User’s Perspective on IES Modeling
Shem Heiple PE, LEED AP, GGP Amy Jarvis PE, LEED AP BD+C
Why IES?
Ability to Model Complex HVAC Systems
Sketch Up Import
Early Stage Modeling
HVAC Loads and Energy Modeling
Bulk Airflow
CFD
Daylighting Integration
Sample Project ─ Shading & Daylighting
Suncast for early design feedback
Radiance-daylight analysis
Radiance integrated with energy model Output daylight file for
sensor location Daylight control profile
Integrated Daylighting & Energy Optimization
ARCHITECTURAL INFORMATION
DAYLIGHTING MODEL
DAYLIGHTING ANALYSIS
ENERGY MODEL: EQUEST
ENERGY ANALYSIS
Daylighting Results
Integrated Daylighting & Energy Optimization
ARCHITECTURAL INFORMATION IES MODEL
DAYLIGHTING ANALYSIS: IES MODEL
Daylighting Results
ENERGY ANALYSIS
Daylighting (RadianceIES)
Daylighting (RadianceIES)
Daylighting (RadianceIES)
Daylighting (RadianceIES)
Daylighting Optimization
Daylighting (RadianceIES)
Daylighting Analysis
Daylighting Results
Energy Analysis
Daylighting (RadianceIES)
Building Shading Analysis
Shading Options Comparison
Sample Project–CFD
Applications
No transient model
Creates surface boundary conditions based on energy model and solar analysis
Natural ventilation and thermal comfort
Wind studies
HVAC Load Calculations
ARCHITECTURAL INFORMATION RESULTS RESULTS
RECONCILIATION
HVAC LOAD CALCULATIONS
ENERGY MODELING
TRANE TRACE
EQUEST
ARCHITECTURAL INFORMATION RESULTS IES
HVAC LOAD CALCULATIONS
ENERGY MODELING
HVAC Load Calculations
Multiple load calculation methods used in the industry.
eQuest: Weighting Factor Method (WF) Uses 8760 file for peak conditions.
IES-VE and EnergyPlus: Heat Balance Method (HB)–most accurate.
Trace: Radiant Time Series (RTS)–Other methods available.
Results differing as much 40% when applied to the same building.
DOE2 Auto Sizing Comparison
BUILDING TYPE DOE2 COOLING (BTU/HR/SF)
DESIGN COOLING (BTU/HR/SF)
PERCENT DIFFERENCE FROM DOE2
LOAD CALCULATION
SOFTWARE
Office 20.6 24.4 15.7% CHVAC (Elite)
Gov Office (24/7) 35.2 29.8 -18.2% Trace
Police Station 11.3 14.3 20.7% CHVAC (Elite)
Community College 27.7 27.3 -1.4% CHVAC (Elite)
Office (PUD) 25.4 19.0 -34.2% CHVAC (Elite)
Using IES for HVAC Load Calculations
Interface and reports are designed for energy analyses, not for mechanical design
Energy analyst and mechanical designer must work together
High level of input complexity for load calculations
Inputs for load calculations and energy model not clearly defined
Load profiles and diversity must be manually reset
IES HVAC Load Output Files
Difficult to understand by non-IES user
Some information needed for engineering validation not provided
Use of Vista required for load validation
System Sizing Plant Loads
Model Validation Using Vista
Model Validation Using Vista
Model Validation Using Vista
Energy Performance Verification
No automated output report
Only report created by PRM navigator
Input verification can be time consuming
Limited reports for fan power or total airflow–must sum up individually
Time consuming to QA/QC
Revit integration
Thank you!
shemh @ interfaceeng.com amy.jarvis @ zgf.com
Shem Heiple PE, LEED AP, GGP Amy Jarvis PE, LEED AP BD+C