Progetto SIMEA - Automatica - Università degli Studi di Padova

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SIMEA Stato dell’arte energetica degli edifici 1.2.25. EnergyPlus 50 Doc.No 20100610.SIMEA.MR.03 Versione 1 Next generation building energy simulation program that builds on the most popular features and capabilities of BLAST and DOE-2. EnergyPlus includes innovative simulation capabilities including time steps of less than an hour, modular systems simulation modules that are integrated with a heat balance-based zone simulation, and input and output data structures tailored to facilitate third party interface development. Recent additions include multizone airflow, electric power simulation including fuel cells and other distributed energy systems, and water manager that controls and report water use throughout the building systems, rainfall, groundwater, and zone water use. EnergyPlus has two basic components, a heat and mass balance simulation module and a building systems simulation module. The building systems simulation manager handles communication between the heat balance engine and various HVAC modules and loops, such as coils, boilers, chillers, pumps, fans, and other equipment/components. User-configurable heating and cooling equipment components give users flexibility in matching their simulation to actual system configuration. HVAC air and water loops are the core of the building systems simulation manager-mimicking the network of pipes and ducts found in real buildings. The air loop simulates air transport, conditioning and mixing, and includes supply and return fans, central heating and cooling coils, heat recovery, and controls for supply air temperature and outside air economizer. The air loop connects to the zone through the zone equipment. Users can specify more than one equipment type for a zone. The heat and mass balance calculations are based on IBLAST-a research version of BLAST with integrated HVAC systems and building loads simulation. The heat balance module manages the surface and air heat balance modules and acts as an interface between the heat balance and the building systems simulation manager. The surface heat balance module simulates inside and outside surface heat balances; interconnections between heat balances and boundary conditions; and conduction, convection, radiation, and mass transfer (water vapor) effects. The air mass balance module deals with various mass streams- ventilation and exhaust air, and infiltration- accounting for zone air thermal mass and direct convective heat gains. EnergyPlus inherits three popular windows and daylighting models from DOE-2.1E-fenestration performance based on WINDOW 5 calculations, daylighting using the split-flux interreflection model, and anisotropic sky models. EnergyPlus detailed daylighting module calculates interior daylight illuminance, glare from windows, glare control, and electric lighting controls (on/off, stepped, continuous dimming), and calculates electric lighting reduction for the heat balance module. In addition, a new daylighting analysis module named DElight has been integrated with EnergyPlus. This module uses a radiosity interreflection method, and includes newly developed methods for analyzing complex fenestration systems characterized by bi-directional transmittance data. 1.2.25.1. Validation/Testing EnergyPlus has been tested against the IEA BESTest building load and HVAC tests. Results are available under Testing and Validation on the EnergyPlus web site. 1.2.25.2. Expertise Required High level of computer literacy not required; engineering background helpful for analysis portions.
SIMEA Stato dell’arte energetica degli edifici 1.2.25.3. Users 51 Doc.No 20100610.SIMEA.MR.03 Versione 1 Over 85,000 copies of EnergyPlus downloaded since it was first released in April 2001. 1.2.25.4. Audience Mechanical, energy, and architectural engineers working for architect/engineer firms, consulting firms, utilities, federal agencies, research universities, and research laboratories. 1.2.25.5. Input EnergyPlus uses a simple ASCII input file. Private interface developers are already developing more targeted / domain specific user-friendly interfaces. See the EnergyPlus web site for up-to-date information on interfaces and other tools for EnergyPlus. 1.2.25.6. Output EnergyPlus has a number of ASCII output files - readily adapted into spreadsheet form for further analysis. 1.2.25.7. Computer Platform Available for Windows XP/Vista, Mac OS, and Linux. 1.2.25.8. Programming Language Fortran 2003 1.2.25.9. Strengths Accurate, detailed simulation capabilities through complex modelling capabilities. Input is geared to the 'object' model way of thinking. Successful interfacing using IFC standard architectural model available for obtaining geometry from CAD programs. Extensive testing (comparing to available test suites) is completed for each version and results are available on the web site. Weather data for more than 1250 locations worldwide available on the web site. 1.2.25.10. Weaknesses Text input may make it more difficult to use than graphical interfaces.
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Progetto SIMEA - Automatica - Università degli Studi di Padova

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