1. Lecture Objectives:
Discuss accuracy of energy simulation and Introduce advance simulation tools
Review the course topics
Do the Course and Instructor Evaluation

2. Testing the Accuracy of Energy Simulations Comparison with measured data
Cranfield test rooms (from Lomas et al 1994a)

3. BESTEST Building Energy Simulation TEST
System of tests (~ 40 cases)
- Each test emphasizes certain phenomena like
external (internal) convection, radiation, ground contact
Simple geometry
Mountain climate
COMPARE THE RESULTS

4. Example of best test comparison

5. Data Driven Modeling Empirical model For average year use TMY2
Load vs. dry bulb temperature
Measured for a building in Syracuse, NY
Model
For average year use TMY2
=835890ton hour = Btu

6. Advance Energy Modeling with coupled energy and airflow Example: Night Cooling/Hybrid Ventilation
The IONICA Office Building, Cambridge, UK

7. Night Cooling/Hybrid Ventilation:
Requires combined Energy and airflow modeling

8. Night Cooling/Hybrid Ventilation: The IONICA Office Building, Cambridge, UK

9. Available software Which software to use:
- Depends on project requirements
- If you have a choice: the one which passed BETEST
Be ready to conduct additional analysis based on your modeling skills

10. Structure of All ES programs
Graphical User
Interface
(GUI)
Solver
Interface for
input data
Interface for result
presentation
Preprocessor
ASCI
file
Preprocessor
Engine

11. ES programs Large variety DOE2 eQUEST (DOE2) BLAST ESPr TRNSYS
DOE2
eQUEST (DOE2)
BLAST
ESPr
TRNSYS
EnergyPlus (DOE2 & BLAST)

12. eQUEST (DOE2) US Department of Energy & California utility customers
eQUEST - interface for the DOE-2 solver
DOE-2 - one of the most widely used ES program
- recognized as the industry standard
eQUEST very user friendly interface
Good for life-cycle cost and parametric analyses
Not very large capabilities for modeling of different HVAC systems
Many simplified models
Certain limitations related to research application
- no capabilities for detailed modeling
DOE3 – very similar

13. ESPr University of Strathclyde - Glasgow, Scotland, UK
Detailed models – Research program
Use finite difference method for conduction
Simulate actual physical systems
Enable integrated performance assessments
Includes daylight utilization, natural ventilation, airflow modeling CFD, various HVAC and control models
Detail model – require highly educated users
Primarily for use with UNIX operating systems

15. TRNSYS Solar Energy Lab - University of Wisconsin
Modular system approach
One of the most flexible tools available
A library of components
Various building models including HVAC
Specialized for renewable energy and emerging technologies
User must provide detailed information about the building and systems
Not free

16. https://sel.me.wisc.edu/trnsys/

17. EnergyPlus U S Department of Energy
Newest generation building energy simulation program ( BLAST + DOE-2)
Accurate and detailed
Complex modeling capabilities
Large variety of HVAC models
Some integration wit the airflow programs
Zonal models and CFD
Detail model – require highly educated users
Very modest interface
Third party interface – very costly
New interface: Open Studio,

18. https://energyplus. net/ https://www. openstudio. net/ https://beopt

19. Modelica (Modelica Buildings Library) http://simulationresearch. lbl

20. THERM Two-Dimensional Building Heat-Transfer Modeling https://windows
Thermal bridge analysis
Window performance analysis

21. WUFI http://web.ornl.gov/sci/buildings/tools/wufi/
Heat and moisture analysis in building structural components

22. Matlab vs. Scilab http://www.scilab.org/ Many other free versions:
Python …

23. Review Course Objectives
1. Identify basic building elements which affect building energy consumption and analyze the performance of these elements using energy conservation models.
2. Analyze the physics behind various numerical tools used for solving different heat transfer problems in building elements.
3. Use basic numerical methods for solving systems of linear and nonlinear equations.
4. Conduct building energy analysis using comprehensive computer simulation tools.
5. Evaluate the performance of building envelope and environmental systems considering energy consumption.
6. Perform parametric analysis to evaluate the effects of design choices and operational strategies of building systems on building energy use.
7. Use building simulations in life-cycle cost analyses for selection of energy-efficient building components.

24. There is a Building Energy System course that I teach in Spring 2017
If you likes this course:
There is a Building Energy System course that I teach in Spring 2017