final project oral presentation

Final project oral presentation

• PowerPoint– Upload the file before the class

• Approximately 6-7 slides (a minute per slide)– Problem introduction – Model development - specific problem– Results (preliminary)– Results (preliminary)– Discussion– Summary

Presenter listThursday in class:

- Nathan & Caleb- Fan & Christina - Kaylyn & Brandon- Zaid & Derek- Evan & Alex

- Eugene & Almendra

Thursday afternoon

- Mina - Greg- Jacob- Wesley- Taylor- Joel - Sami- Munachiso- Sara

Lecture Objectives:

• Discuss airflow modeling in energy simulation tools

• LEED and energy simulation

• Course summary and Course evaluation

Requirement for modeling of mass flow in ES programs

m

m

Combined 1) Air flow and 2) Energy flow modeling

Example: Night Cooling/Hybrid Ventilation:The IONICA Office Building, Cambridge, UK

Night Cooling/Hybrid Ventilation:The IONICA Office Building, Cambridge, UK

Night Cooling/Hybrid Ventilation:The IONICA Office Building, Cambridge, UK

Energy and Airflow simulation domain

Coupling surfaces

Coupling

EnergySimulationProgram

Air FlowProgram IAQData:

geometryweathermaterials

Twall, CFM, Tsupply

Tnear surface, h surface

V,T,…

Energy cons.

Airflow simulation can be based on:

1) CFD (computational fluid dynamics)

2) Multizone modeling

Coupling

ESprogram

CFDprogram

(converged)(converged)

CFDprogram

(converged)

ESprogram

controlled parameters m su pp ly and T Tsup ply s ur fac eor

T surfaces

controlled parameters m su pp ly and T Tsu pp ly su rf aceor

T surfaces

satisfactorysmall error

Time s tep Time step

ha dj.c ell , Ta dj.c ell ha dj.c ell , Ta dj.c ell

ES CFD

Onion

ESprogram

CFDprogram

(converged)(converged)

CFDprogram

(converged)

ESprogram

controlled parameters m su pp ly and T Tsup ply s ur fac eor

T surfaces

controlled parameters m su pp ly and T Tsu pp ly su rf aceor

T surfaces

ha dj.c ell , Ta dj.c ell

Time step Time step

ES CFD

Ping-Pong

Coupled Airflow and Energy Simulation SoftwareComponents and Data flow

GUIPREPROCESSOR

ESPROGRAM

CFDPROGRAM

CFDinputdata(txt)

Convectionb.c. for ES

(txt)TMY2wether

data (txt)

CFDG UI

postprocessor

ESG UI

p ostprocessor

Inputdata for

CFDandES(txt)

call

data flo w

call

ca

ll

ca

ll

call

data flowcall

data flow

ESoutputdata(txt)

CFDoutputdata(txt)

convergency control

Postprocessor Output

Preprocessor Solver

results

results

Thermal comfort - Temperature & gradientVentilating Systems EvaluationVentilating Systems Evaluation

0 2 4 6 8 10 12 14 16 18 20 22 240.5

1.0

1.5

2.0

2.5

3.0 maximum - ASHRAE Standard 55

DV/CC DV

Tem

pera

ute

gra

dien

t

[oC

/m]

hour

DV/CC DV

Energy Modeling for LEED Projects

The methodology described in ASHRAE 90.1–2004 (Appendix G), California Title 24–2005, and Oregon Energy Code 2005 involves the

generation of two energy models:

– one representing a baseline minimum-standard building and the

– other representing the proposed building with all its designed energy enhancements.

• ASHRAE Standard 90.1 “Energy Standard for Buildings Except Low-Rise Residential Buildings”

– posted in the course handouts, also UT library has all ASHRAE and ANSI standards http://www.lib.utexas.edu/indexes/titles.php?let=A

• Relevant LEED Documentation– ttp://www.usgbc.org/ShowFile.aspx?DocumentID=7795

– Software List http://www.usgbc.org/ShowFile.aspx?DocumentID=3478

DOE reference building that satisfy ASHRAE 90.1

• Sixteen climate zones

• Sixteen building types

• http://www1.eere.energy.gov/buildings/commercial_initiative/reference_buildings.html

• Models already built for use in EnergyPlus

Accuracy of your energy simulation

Depends primarily on your input data!• Geometry• Boundary condition• Selected models • Set points• Control set-up• Internal loads and schedule

Building modeling software

Very powerful tool

Use it wisely!

Simulation SoftwareGarbage IN Garbage OUT

but

We need sophisticated users more than sophisticated software

How to get more info about software (any software)

• Software documentation – http://apps1.eere.energy.gov/buildings/energyplus/energyplus_documentation.cfm

– …..

• Forums – http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/– ….

• Call developers – works primarily for non-free software

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 the 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.

Review Course Objectives