Modelica Buildings library

Wetter, Michael; Zuo, Wangda; Nouidui, Thierry Stephane; Pang, Xiufeng

doi:10.1080/19401493.2013.765506

Cited by 485 publications

(279 citation statements)

References 7 publications

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“…Modelica [25], developed by the Modelica Association, is a freely available, object-oriented Currently, several Modelica libraries exist for building components and HVAC systems, and these are continuously being upgraded [26]- [29]. Moreover, the International Energy Agency (IEA) has undertaken a large-scale international project (IEA ECB Annex 60, http://iea-annex60.org/) with the aim to develop a new generation of computational tools for building energy systems based on Modelica.…”

Section: Previous Studies and Modelicamentioning

confidence: 99%

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Maccarini

Wetter

Afshari

et al. 2017

Energy and Buildings

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This paper analyzes the performance of a novel two-pipe system that operates one water loop to simultaneously provide space heating and cooling with a water supply temperature of around 22°C.To analyze the energy performance of the system, a simulation-based research was conducted. The two-pipe system was modelled using the equation-based Modelica modeling language in Dymola.A typical office building model was considered as the case study. Simulations were run for two construction sets of the building envelope and two conditions related to inter-zone air flows. To calculate energy savings, a conventional four-pipe system was modelled and used for comparison.The conventional system presented two separated water loops for heating and cooling with supply temperatures of 45°C and 14°C, respectively. Simulation results showed that the two-pipe system was able to use less energy than the four-pipe system thanks to three effects: useful heat transfer from warm to cold zones, higher free cooling potential and higher efficiency of the heat pump. In particular, the two-pipe system used approximately between 12% and 18% less total annual primary energy than the four-pipe system, depending on the simulation case considered. KeywordsEnergy saving, HVAC systems, low-exergy, simulation, Modelica, active beams

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Section: Previous Studies and Modelicamentioning

confidence: 99%

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Maccarini

Wetter

Afshari

et al. 2017

Energy and Buildings

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“…The topological representations support direct matching of the structure and decomposition of the physical system's topologies to building performance analysis models [14,38]. The need to facilitate a natural mapping between BIM and Modelica-based OOPM for building performance analysis is what inspired the development of these easy-to-use Modelica libraries [46,47]. Below, we have briefly described these libraries in terms of their use in building performance analysis: In an effort to distribute the effects of these benefits (e.g., equation-based and multi-domain models), modelers and researchers alike have adopted Modelica into these libraries by providing common model elements and terminology in order to support specific domain simulations.…”

Section: Object-oriented Physical Modeling For Building Performance Amentioning

confidence: 99%

A Performance Evaluation of the BIM-Based Object-Oriented Physical Modeling Technique for Building Thermal Simulations: A Comparative Case Study

Jeong

Kim

2016

Sustainability

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Abstract:The development of separate building performance simulation tools has brought about a significant need for the integration of multi-domain simulations that would enable multiple building performance analyses to be conducted from a single building model. Insufficient data integration between the tools and Building Information Modeling (BIM) currently prevents the efficient production of comprehensive building performance analyses. To overcome this problem, a multi-domain simulation tool, effective and efficient data, and a process integration methodology are all required. Object-Oriented Physical Modeling (OOPM) has emerged as a form of object-oriented modeling capable of supporting multiple domain simulations. Adoption of OOPM into building performance simulations with BIM is particularly interesting as a means of facilitating model translations between BIM and BEM (Building Energy Modeling). Specifically, complex data translation from the building topology in BIM to the space boundary conditions in BEM is both labor intensive and time consuming. This research uses case studies to investigate the feasibility of automatically translating a building topology from BIM to OOPM-based BEM. We included numerous preconditions in order to incorporate various object semantic differences into each model translation. Our research indicates that this adoption approach allows seamless model translations from BIM to OOPM-based BEM, which supports efficient and effective thermal simulations and facilitates the reuse of BIM data in multi-domain simulations.

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“…The dynamics of the HCF is calculated using the Fluid base classes of the open-source Buildings library [18] ( PartialFourPortInterface, PartialTwoPortInterface, TwoPortFlowResistanceParameters, LumpedVolumeDeclarations) and the Media library from the Modelica Standard Library. The convection resistance between the HCF and the pipe is calculated by the correlation for smooth pipe in turbulent flow regime of Dittus-Boelter in the case of single-and double-U-tubes.…”

Section: Short-term Response Modelmentioning

confidence: 99%

“…The open-source Modelica Buildings library developed by the Lawrens Berkeley National Laboratory (LBNL, US) is the only freely available library which has a U-tube single borehole model [18]. The borehole model is similar to the EWS model implemented in TRNSYS (type 451, [17]).…”

Section: Introductionmentioning

confidence: 99%

Advanced Hybrid Model for Borefield Heat Exchanger Performance Evaluation, an Implementation in Modelica

Picard¹,

Helsen²

2014

Linköping Electronic Conference Proceedings

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Accurate and computationally efficient borefield models are important components in building energy simulation programs. They have not been implemented in Modelica so far. This paper describes the implementation of an innovative approach to model borefields with arbitrary configuration having both shortterm (minutes) and long-term accuracy (decades) into Modelica. A step response is calculated using a combination of a short-term response model which takes into account the transient heat transfer in the heat carrier fluid, the grout and the immediately surrounding ground, and a long-term response model which calculates the boreholes interactions. Moreover, an aggregation method is implemented to speed up the calculations. Validation shows good results and very high computational efficiency.

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Modelica Buildings library

Cited by 485 publications

References 7 publications

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

Energy saving potential of a two-pipe system for simultaneous heating and cooling of office buildings

A Performance Evaluation of the BIM-Based Object-Oriented Physical Modeling Technique for Building Thermal Simulations: A Comparative Case Study

Advanced Hybrid Model for Borefield Heat Exchanger Performance Evaluation, an Implementation in Modelica

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