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 DOE2 eQUEST (DOE2) BLAST ESPr TRNSYS
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. ESPr University 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. ESPr University of Strathclyde - Glasgow, Scotland, UK
Detailed models
– Research program

7. TRNSYS Solar 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. EnergyPlus U 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 4 Modeling based on Measured Data
Location: Syracuse

13. HW4 Empirical model: Q=f(DBT)