Progetto SIMEA - Automatica - Università degli Studi di Padova

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SIMEA Stato dell’arte energetica degli edifici 1.2.45. TRNSYS 82 Doc.No 20100610.SIMEA.MR.03 Versione 1 An energy simulation program whose modular system approach makes it one of the most flexible tools available. TRNSYS (TRaNsient SYstem Simulation Program) includes a graphical interface, a simulation engine, and a library of components that range from various building models to standard HVAC equipment to renewable energy and emerging technologies. The components are configured and assembled using a fully integrated visual interface known as the TRNSYS Simulation Studio, and building input data are entered through a dedicated visual interface (TRNBuild). The simulation engine then solves the system of algebraic and differential equations that represent the whole system. In building simulations, all HVAC-system components are solved simultaneously with the building envelope thermal balance and the air network at each time step. The program typically uses 1-hour or 15-min time steps but can achieve 0.1-sec time steps. User-selectable (e.g. hourly and monthly) summaries can be calculated and printed. In addition to a detailed multizone building model, the TRNSYS library includes many of the components commonly found in thermal and electrical energy systems: solar thermal and photovoltaic systems, low energy buildings and HVAC systems, renewable energy systems, cogeneration, and hydrogen systems (e.g. fuel cells). It also provides component routines to handle input of weather data or other time- dependent forcing functions and output of simulation results. The modular nature of TRNSYS facilitates the addition of new mathematical models to the program. Components can be easily shared between users without recompiling the program thanks to the drop-in DLL technology. Simple components, control strategies or pre- and post-processing operations can also be implemented directly in the input file using simple equations supporting the usual mathematical and logical operators and can use the (optionally delayed) outputs of other components. In addition to the ability to develop new components in any programming language, the program allows to directly embed components implemented using other software (e.g. Matlab/Simulink, Excel/VBA, and EES). Additionally, TRNSYS includes the ability to add HTML-like syntax to any input file. An interpreter program called TRNSED allows non-TRNSYS users to then view and modify a simplified, webpage like representation of the input file and perform parametric studies. 1.2.45.1. Validation/Testing TRNSYS is primarily an equation solving program based on standard numerical techniques. However, validation does become important for the individual components in TRNSYS. See the TRNSYS web site for validation articles related to TRNSYS or its components. 1.2.45.2. Expertise Required None to use standard package; FORTRAN knowledge helpful for developing new components. 1.2.45.3. Users Over 500. 1.2.45.4. Audience Engineers, researchers, consulting firms, architects.
SIMEA Stato dell’arte energetica degli edifici 1.2.45.5. Input 83 Doc.No 20100610.SIMEA.MR.03 Versione 1 The TRNSYS input file, including building input description, characteristics of system components and manner in which components are interconnected, and separate weather data (supplied with program) are all ASCII files. All input files can be generated by using a graphical user interface, known as the Simulation Studio. 1.2.45.6. Output Basic output format is ASCII. The data included in those files can be life cycle costs; monthly summaries; annual results; histograms; plotting of desired variables (by time unit). It is also possible toplot variables online (as the simulation progresses). 1.2.45.7. Computer Platform Windows 95 or higher (98, NT, 2000, ME etc.) for TRNSYS interface programs. (Distributed source code will compile and run on any Fortran platform). 1.2.45.8. Programming Language FORTRAN (although unnecessary for the use of standard components). It is also possible to write components in C++. 1.2.45.9. Strengths Due to its modular approach, TRNSYS is extremely flexible for modelling a variety of energy systems in differing levels of complexity. Supplied source code and documentation provide an easy method for users to modify or add components not in the standard library; extensive documentation on component routines, including explanation, background, typical uses and governing equations; supplied time step, starting and stopping times allowing choice of modelling periods. The TRNSYS program includes a graphical interface to drag-and-drop components for creating input files (Simulation Studio), a utility for easily creating a building input file (TRNBuild), and a program for building TRNSYS-based applications for distribution to non-users (TRNEdit). Web-based library of additional components and frequent downloadable updates are also available to users. Extensive libraries of non standard components for TRNSYS are available commercially from TRNSYS distributors. TRNSYS also interfaces with various other simulation packages such as COMIS, CONTAM, EES, Excel, FLUENT, GenOpt and MATLAB. 1.2.45.10. Weaknesses No assumptions about the building or system are made (although default information is provided) so the user must have detailed information about the building and system and enter this information into the TRNSYS interface.
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Progetto SIMEA - Automatica - Università degli Studi di Padova

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