1. Lecture Objectives: Discuss exam questions
Define final project assignments
Discuss major ES software

2. Requirement for the project
me (before Friday morning):
Final project group members
Project title
One paragraph ( words) including
- Project objective
Methodology
Expected results
Any schematic drawing is welcome
Wednesday after 2 pm and Thursday after 11 am long office hours to discuss your project

3. Commercial Buildings Building
1) Optimization of building envelops
glass area ,shading,….
2) Effect of internal loads on energy consumption
Systems
1) Impact of HVAC systems
2) Design of solar system (PV or hot water)
……………..
Life cycle cost analysis in each project

4. Example of HVAC: water cooled chiller
Cooling tower
Building
Water 120°F
Water 52°F
Outside air 95°F
Water 100°F
Inside 75°F
Water 42°F
Task: analyze COP
for the whole year
and different locations

5. Example of HVAC thermal storage systems (in combination with a cooling machine / heat pump)
Summer
Winter
In the summer, the earth acts as a cooling tower. The Cooling Machine loads the loop with heat, sending warmed water to be cooled by the earth
In the winter, the earth acts as the boiler. The Heat Pump extracts heat from the loop, sending cooled water to be warmed by the earth.

6. Residential buildings
It is very expensive to optimize each residential building
We optimize example buildings to develop local codes
UT Solar Decathlon 2007
Home Research Lab
Test house (PRC)

7. Modeling for optimization of Home Research Lab (PSP)

8. Energy consumption in Austin’s residential house
Analyze impact of:
envelope
Internal loads
HVAC systems
Conduct life cycle
const analysis
See handout section

9. More final project topics:
Software (eQUEST) based
Energy analysis of building form Integrated design course,
Any other building or building system
Detail Modeling (your model)
Heat recovery systems,
Attic problem,
Mass transfer (moisture,…)
Vented cavity walls - exam problem
Green house model
Your ideas…

10. Project Grading Undergraduate students Graduate students
Grading criteria (30% of your final grade):
1) Analysis approach: %
- Modeling quality 20%
- Result accuracy 20%
- Result analysis 20%
2) Deliverables: %
- Quality of the final report 25%
- Quality of oral presentations 15%
Undergraduate students
Engineering report
Graduate students
Research report

11. Project Timeline 11/11/11 – project defined and approved
11/22/11- generated preliminary results
12/01/11 - oral presentation
12/05/11 - project paper submission

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

13. Modeling steps Define the domain Analyze the most important phenomena
and define the most important elements
Discretize the elements and
define the connection
Write energy and mass balance
equations
Solve the equations
Present the result
ES program
Preprocessor
Solver
Postprocessor

14. Characteristic parameters
Conduction (and accumulation) solution method
finite dif (explicit, implicit), response functions
Time steps
Meteorological data
Radiation and convection models (extern. & intern.)
Windows and shading
Infiltration models
Conduction to the ground
HVAC and control models

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

16. 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

17. 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

18. 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

19. 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