The University of Texas at Austin Fall 2014
CAEE Department, Architectural Engineering Program
Course:
Energy Simulation in Building Design
Instructor:
Dr. Atila Novoselac
ECJ, 5.430
Office (512) 475-8175
e-mail: atila@mail.utexas.edu
http://www.ce.utexas.edu/prof/Novoselac
Office Hours:
Tuesday and Thursday 11:00 a.m. – 12:00 p.m.
Lecture Objectives:
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Discuss syllabus
Describe course scope
Introduce course themes
Address your concerns
Heat transfer review
Introduce yourself
• Name
• Background
• Academic program
• Graduate/undergraduate or auditing
Motivation for learning about
Energy Simulation in Building Design
Buildings:
• Responsible for ~40% of total energy consumption in U.S.
• Affect the CO2 emission
• Building energy systems with the building envelope affect:
• Energy consumption – operation cost
• First cost – capital cost
• Thermal comfort and IAQ
Energy analysis for
- Optimum balance between operational and capital cost
Motivation: Recognize inaccuracy in
energy related technology statements
What do you think about this
statement?
In the article an advertiser claim 30%
saving on electric bill.
Energy consumption in Austin’s
residential house
Miscellaneous
Cooling
Washer
Range
Refrigerator
2000
(15,600 kWh)
Including gas
Lighting
Dryer
Hot water
A well-insulated attic
Heating in Austin will only comprise
10% - 15% of the sensible
Cooling and Heating load.
Energy target value for a new house in
Austin
New single family 2262 sf, 2-story home
18000
Miscellaneous
15620 kWh
Washers
16000
Range
Refrigerator
14000
Lighting
12862 kWh
11304 kWh
12000
Dryer
Hot water
Heating
Cooling
10000
8000
7086 kWh
6000
4000
2000
0
2000
2006
2010
target (2015)
Student interested in
Sustainable Design
LEED - Leadership in Energy and Environmental
Design
1) LEED Certification require that building has analysis
related to energy performance
2) All government buildings require energy analysis
- all new UT buildings require energy analysis
What is Energy Analysis ?
Samsung R&B Building
UT Solar Decathlon House 2007
Example of energy modeling for building optimization
Design iterations to optimize
shape and energy use
Architectural models
Energy-simulation models
Solutions:
•passive shadings
•positions and area of windows
•insulation value
•tightly sealed envelope
•high-performance window
•position of solar collectors
Design
iterations
Example of Solar Analysis for the
Pike Powers Commercialization Lab
Solar panels
Heat and mass transfer in buildings
Energy simulation software
Garbage IN
Garbage OUT
Simulation Software
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
heat and moisture 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 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.
Prerequisites
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ARE 346N Building Environmental Systems
ME 320 Thermodynamics
or similar courses
Knowledge of the following is beneficial:
- Heat transfer
- Numerical methods
- Programming
Textbook
Energy Simulation in Building Design
J A Clarke, 2002 (2nd Edn)
NOTE: Useful but not required !
References:
1) 2001 ASHRAE Handbook: Fundamentals.
IP or SI edition, hard copy or CD
2) Numerical Heat Transfer and Fluid Flow
S V Patankar, 1980
3) Solar Engineering of Thermal Processes
John A. Duffie, William A. Beckman, 1991
4) Design of Thermal Systems
W. F. Stoecker, 1998
Handouts
• Copies of appropriate book sections
• Book from the reference list
• I will mark important sections
• Disadvantage - different nomenclature and terminology
• I will point-out terms nomenclature and terminology
differences
• Journal papers
• Related to application of energy simulation programs
Other books for reading
• ASHRAE Fundamentals
• Great and very complete reference about HVAC and heat transfer
• Heating Ventilating and Air Conditioning
Mcqusiton, Spittler, Parker (2000)
• Basic knowledge about HVAC systems
• Fundamentals of Heat and Mass Transfer
Incropera, Witt, (2001)
• Excellent reference and textbook about fundamental of Heat transfer
Energy simulation (ES) software
• We are going to learn to evaluate:
• importance of input data
• effects of simplification and assumptions
• accuracy of results
for each ES program
• We are going to talk about several most commonly used
ES programs
• Concentrate on eQUEST and EnergyPlus
– for projects and homework's
http://www.doe2.com/equest/ , http://apps1.eere.energy.gov/buildings/energyplus/
Why eQUEST software
• It is free - you can take it to your future company
• It has user-friendly interface
• It has built in functions for economic analyses
• It is based on well tested DOE2 ES program
There are certain limitations
limited number of HVAC system
Energy Plus
Open Studio
BEopt
Moisture related problems
Moisture transfer software
• WUFI
• http://web.ornl.gov/sci/ees/etsd/btric/wufi/software.shtml
Topics
1. Course Introduction and Background
2. Fundamentals of energy mass transfer
3. Thermal analysis of building components
4. Numerical methods
5. Fundamentals of moisture transfer
6. Energy and moisture simulation tools
7. Introduction to modeling software
8. Building envelope analyses
9. HVAC System analyses
10. Parametric Analyses
0.5 wk
1.5 wks
2 wk
1 wk
1 wk
1 wk
1 wk
2 wks
2 wks
2 wks
Grading
Test
Homework Assignments
Midterm Project
Final Project & Presentation
Classroom Participation
25%
30%
10%
30%
5%
100%
Grading
Undergraduate
> 90 A
80-90 B
70-80 C
60-70 D
< 60 F
Graduate
> 93 A
90-93 A86-90 B+
83-86 B
80-83 B< 80 C-, C, C+
Participation 5%
• How to get participation points
• Come to class
• Participate in class
• Come see me in my office
Midterm Exam 30%
• October 30 (will be confirmed)
• Problems based on topics cover in the first
part of the course
Homework 25%
Total 4
HW1: two parts Solar radiation problem
• HW2 & HW3: Problems related to building
heat transfer modeling
• HW4: Moisture transfer
Midterm Project 10%
• Individual project
1) Use of eQUEST (or EnergyPlus)
simulation tool for building envelope
analysis
- Primary goal is to get familiar with the software
Final Project 35%
1) Use of simulation tool (commercially
available) or your model for detail energy
analysis
- Energy analysis of building envelope and HVAC systems
- Problems related to your future career
- Problems related to your internship
2) Problem related your future job or research
- You propose
• Project seminar
Project Topic Examples
• UT Solar Decathlon 2015
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Envelope
HVAC systems
Solar collectors
http://www.utexas.edu/news/2014/02/17/studentscompete-solar-decathlon/
• Facade Thermal Lab at UT SOA
• Design and optimization of
thermal storage systems
Course Website
All course information:
http://www.ce.utexas.edu/prof/Novoselac/classes/ARE383/
• Your grades and progress on Canvas
• Look at assignments and handout sections
• Class notes posted in the morning before the class
• PLEASE LET ME KNOW ABOUT ERRORS
Units System
We will use both SI and IP unit system
• Research: SI
• HVAC industry including architectural and
consulting companies IP
First part of the course
Second part of the course
more SI
IP and SI
My Issues
• Please try to use office hours for questions
problems and other reasons for visit
• Please don’t use e-mail to ask me questions
which require long explanations
• Call me or come to see me
• I accept suggestions
• The more specific the better
Questions ?
Next class:
Short intro to PLUS by Leta Moser
• This course got PLUS accreditation
• Peer-Led Undergraduate Studying (PLUS)
• assists students enrolled in historically difficult
courses by offering class-specific, weekly study
groups.
• Students can attend any study group at any point in
the semester to review for an exam, discuss
confusing concepts, or work through practice
problems.
• http://www.utexas.edu/ugs/slc/support/plus
Assignment 0
• Your motivation and expectation
• Due on Tuesday
Review - Heat transfer
• Convection
• Conduction
• Radiation
Example Problem –radiant barrier
in attic