Announcement about the final project presentations: Thursday 8:00 – 10:45 am 16 presentations – 5 minutes each +2 minutes for Q&A PowerPoint –Upload the file before the class Approximately 5-6 slides (a minute per slide) –Problem introduction –Model development - specific problem –Results –Discussion / Summary

Presenter list (will send you by today) Thursday 9:30 am: …….. …… Thursday 8:00 am: …….. ……

Lecture Objectives: Moisture transport –Point out similarity with heat transfer –Introduce the process and modeling software Finalize discussion about energy modeling – Application –Accuracy –Use in LEED certification process Course summary and Course evaluation

Moisture related problems

Moisture transport - fundamentals However, you should be very carful how you use vapor barrier ! Theory & application (on the whiteboard)

Moisture transport (WUFI)

Moisture transfer software WUFI

List of energy simulation tools Office of Energy Efficiency & Renewable Energy (EERE)Office of Energy Efficiency & Renewable Energy – Building Energy Software Tools Directory e_menu=whole_building_analysis/pagename_submenu=energy_simulationhttp://apps1.eere.energy.gov/buildings/tools_directory/subjects.cfm/pagename=subjects/pagenam e_menu=whole_building_analysis/pagename_submenu=energy_simulation

Your modeling in Excel MATLAB Scilab – Many other Mathematica – Mathcad – Python – EES – …….

What are the reasons for energy simulations? 1) Building design improvement 2) System Development 3) Economic benefits 4) Budget planning

1) 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 Relevant LEED Documentation –ttp:// –Software List

DOE reference building that satisfy ASHRAE 90.1 Sixteen climate zones Sixteen building types al_initiative/reference_buildings.htmlhttp://www1.eere.energy.gov/buildings/commerci al_initiative/reference_buildings.html Models already built for use in EnergyPlus

2) System development THERM: heat thermal bridge analysis Example: facade design tool

3) Economic benefits Life Cycle Cost Analysis

Budget planning for existing buildings 1) Building design improvement 2) System Development 3) Economic benefits 4) Budget planning

Empirical model Load vs. dry bulb temperature Measured for a building in Syracuse, NY Model For average year use TMY2 =835890ton hour = Btu

Building modeling software Very powerful tool Use it wisely! Simulation Software Wrong INWrong OUT but We need sophisticated users more than sophisticated software

How to get more info about software (any software) Software documentation – –….. Forums – –…. 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