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: atila@mail.utexas.eduhttp://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