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Lecture Objectives:

Lecture Objectives:. Finish with major ES software Introduce HW 4. Characteristic parameters. Conduction (and accumulation) solution method finite dif (explicit, implicit), response functions Time steps Meteorological data Radiation and convection models (extern. & intern.)

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Lecture Objectives:

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  1. Lecture Objectives: • Finish with major ES software • Introduce HW 4

  2. Characteristic parameters • Conduction (and accumulation) solution method • finite dif (explicit, implicit), response functions • Time steps • Meteorological data • Radiation and convection models (extern. & intern.) • Windows and shading • Infiltration models • Conduction to the ground • HVAC and control models

  3. ES programs • Large variety • http://www.eere.energy.gov/buildings/tools_directory • DOE2 • eQUEST (DOE2) • BLAST • ESPr • TRNSYS • EnergyPlus (DOE2 & BLAST)

  4. eQUEST (DOE2)US Department of Energy & California utility customers • eQUEST - interface for the DOE-2 solver • DOE-2 - one of the most widely used ES program - recognized as the industry standard • eQUEST very user friendly interface • Good for life-cycle cost and parametric analyses • Not very large capabilities for modeling of different HVAC systems • Many simplified models • Certain limitations related to research application - no capabilities for detailed modeling

  5. ESPrUniversity of Strathclyde - Glasgow, Scotland, UK • Detailed models – Research program • Use finite difference method for conduction • Simulate actual physical systems • Enable integrated performance assessments Includes daylight utilization, natural ventilation, airflow modeling CFD, various HVAC and control models • Detail model – require highly educated users • Primarily for use with UNIX operating systems

  6. ESPrUniversity of Strathclyde - Glasgow, Scotland, UK • Detailed models – Research program

  7. TRNSYSSolar Energy Lab - University of Wisconsin • Modular system approach • One of the most flexible tools available • A library of components • Various building models including HVAC • Specialized for renewable energy and emerging technologies • User must provide detailed information about the building and systems • Not free

  8. Component-based simulation programs - Trnsys

  9. EnergyPlusU S Department of Energy • Newest generation building energy simulation program ( BLAST + DOE-2) • Accurate and detailed • Complex modeling capabilities • Large variety of HVAC models • Some integration wit the airflow programs Zonal models and CFD • Detail model – require highly educated users • Very modest interface • Third party interface – very costly

  10. EnergyPlus

  11. Software comparison(BESTest)

  12. HW 4Modeling based on Measured Data Location: Syracuse

  13. HW4Empirical model: Q=f(DBT)

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