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The University of Texas at Austin Fall 2011

CAEE Department, Architectural Engineering Program

Course: Energy Simulation in Building Design 

Instructor: Dr. Atila Novoselac

ECJ, 5.422

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.

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Lecture Objectives:

• Discuss the syllabus

• Describe scope of the course

• Introduce the course themes

• Address any of your concerns

• Heat transfer review

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Introduce yourself 

• Name

• Background• academic program

• Graduate/undergraduate or auditing

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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

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Motivation: Recognize inaccuracy in

energy related technology statements

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What do you think about this

statement?

In the article an advertiser claim 30%saving on electricity bill.

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Energy consumption in Austin’s

residential house

2000(15,600 kWh)Including gas

CoolingMiscellaneous

Range

Dryer

Heating

Lighting

Hot water

Refrigerator

Washer

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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

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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 

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Samsung R&B Building

What is Energy Analysis ?

UT Solar Decathlon House 2007

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Example of energy modeling for building optimization

Design iterations to optimizeshape 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

Designiterations

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Example of Solar Analysis for the

Pecan Street Project Demo House

Solar panels

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Heat and mass transfer in buildings

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Energy simulation software

Simulation SoftwareGarbage IN Garbage OUT

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1. Identify basic building elements which affect building energyconsumption 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 buildingenergy use.

7. Use building simulations in life-cycle cost analyses for selection of energy-efficient building components.

Course Objectives 

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Prerequisites

• ARE 346N Building Environmental Systems

• ME 320 Thermodynamics

or similar courses

Knowledge of the following is beneficial:

- Heat transfer- Numerical methods

- Programming

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Textbook 

 Energy Simulation in Building Design 

J A Clarke, 2002 (2nd Edn)

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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

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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

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Other books for reading

• ASHRAE Fundamentals• Great and very complete reference about HVAC and heat transfer

• Heating Ventilating and Air ConditioningMcqusiton, Spittler, Parker (2000) • Basic knowledge about HVAC systems

• Fundamentals of Heat and Mass TransferIncropera, Witt, (2001)• Excellent reference and textbook about fundamental of Heat transfer

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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 usedES programs

• Concentrate on eQUEST – for projects and homework's

http://www.doe2.com/equest/  

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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

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Topics

1. Course Introduction and Background 0.5 wk 

2. Fundamentals of energy mass transfer 1.5 wks

3. Thermal analysis of building components 2 wk 

4. Numerical methods 2 wks5. Energy simulation tools 1 wk 

6. Introduction to DOE2(eQUEST) software 1 wk 

7. Building envelope analyses 2 wks

8. HVAC System analyses 2 wks

9. Parametric Analyses 2 wks

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eQuest software

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Test 25%

Homework Assignments 30%Midterm Project 10%

Final Project & Presentation 30%

Classroom Participation 5%100%

Grading

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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+

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Participation 5%

• How to get participation points

• Come to class

• Participate in class

• Come see me in my office

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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

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Homework 30%

Total 3

• HW1

Solar radiation problem

• HW2 , HW3

Problems related to building heat transfermodeling

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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

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Final Project 30%

1) Use of simulation tool (commerciallyavailable 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

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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

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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

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Units System

We will use both SI and IP unit system

• Research: SI

• HVAC industry including architectural andconsulting companies IP

First part of the course more SISecond part of the course more IP 

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Any Questions ?

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Assignment 0

• Your motivation and expectation

• Due on Tuesday

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Review - Heat transfer

• Convection

• Conduction

• Radiation

Example Problem –radiant barrier

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Example Problem – radiant barrier

in attic