the university of texas at austin fall 2011 caee department, architectural engineering program...
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The University of Texas at Austin Fall 2011CAEE Department, Architectural Engineering Program
Course: Energy Simulation in Building Design
Instructor: Dr. Atila NovoselacECJ, 5.422Office (512) 475-8175 e-mail: [email protected]://www.ce.utexas.edu/prof/Novoselac
Office Hours: Tuesday and Thursday 11:00 a.m. – 12:00 p.m.
Lecture Objectives:
• Discuss the syllabus
• Describe scope of the course
• Introduce the course themes
• Address any of 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 electricity bill.
Energy consumption in Austin’s residential house
2000 (15,600 kWh)Including gas
CoolingMiscellaneous
Range
Dryer
Heating
Lighting
Hot water
Refrigerator
Washer
Target value for a new house in AustinNew single family 2262 sf, 2-story home
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
2000 2006 2010 target (2015)
Miscellaneous
Washers
Range
Refrigerator
Lighting
Dryer
Hot water
Heating
Cooling
15620 kWh
12862 kWh
11304 kWh
7086 kWh
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
Samsung R&B Building
What is Energy Analysis ?UT Solar Decathlon House 2007
Example of energy modeling for building optimization
Design iterations to optimize shape and energy use
Solutions:
•passive shadings
•positions and area of windows
•insulation value
•tightly sealed envelope
•high-performance window
•position of solar collectors
Architectural models Energy-simulation models
Design iterations
Example of Solar Analysis for thePecan Street Project Demo House
Solar panels
Heat and mass transfer in buildings
Energy simulation software
Simulation SoftwareGarbage IN Garbage OUT
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 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.
Course Objectives
Prerequisites
• 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)
Textbook
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 – for projects and homework's http://www.doe2.com/equest/
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 limitationslimited number of HVAC system
Topics
1. Course Introduction and Background 0.5 wk2. Fundamentals of energy mass transfer 1.5 wks3. Thermal analysis of building components 2 wk4. Numerical methods 2 wks5. Energy simulation tools 1 wk6. Introduction to DOE2(eQUEST) software 1 wk7. Building envelope analyses 2 wks8. HVAC System analyses 2 wks9. Parametric Analyses 2 wks
eQuest software
Test 25%
Homework Assignments 30%
Midterm Project 10%
Final Project & Presentation 30%
Classroom Participation 5%
100%
Grading
Grading
Undergraduate Graduate
> 90 A > 93 A
80-90 B 90-93 A-
70-80 C 86-90 B+
60-70 D 83-86 B
< 60 F 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 25%
• October 25 (will be confirmed)
• Out of class time exam (2 hours)
• Problems based on topics cover in first part of the course
Homework 30%
Total 3• HW1
Solar radiation problem
• HW2 , HW3Problems related to building heat transfer modeling
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
2) You can suggest your own problem
- modeling
Final Project 30%
1) Use of simulation tool (commercially available or your) 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 MS or PhD thesis - You propose
• Project seminar
Project Topic Example
• Pecan Street Project - Demonstration House• Real project – building connected to smart grid• Optimization of
• Envelope
• HVAC systems
• Solar panels
• 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 Blackboard
• 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 more SI
Second part of the course more IP
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
Any Questions ?
Assignment 0
• Your motivation and expectation
• Due on Tuesday
Review - Heat transfer
• Convection
• Conduction
• Radiation
Example Problem –radiant barrier in attic