Coupling building energy simulation and computational fluid dynamics: An overview

Rodríguez-Vázquez, Martín; Hernández-Pérez, I.; Xamán, J.; Chávez, Y.; Gijón-Rivera, M.; Belman-Flores, J.M.

doi:10.1177/1744259120901840

Cited by 18 publications

(5 citation statements)

References 71 publications

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“…Since the time scale of transport in the air subdomain is much smaller than that in the building materials, it is assumed that the solution of the air subdomain remains constant during the transient simulation in the building subdomain (Saneinejad et al, 2014). Information is exchanged at the coupled boundaries at every exchange timestep, similar to the quasi-dynamic coupling mentioned in Rodrı´guez-Va´zquez et al (2020). The exchange timestep is set to 10 min in this study.…”

Section: Coupling Approachmentioning

confidence: 99%

Smart wetting of permeable pavements as an evaporative-cooling measure for improving the urban climate during heat waves

Kubilay¹,

Ferrari²,

Derome

et al. 2020

Journal of Building Physics

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An urban microclimate model is used to design a smart wetting protocol for multilayer street pavements in order to maximize the evaporative cooling effect as a mitigation measure for thermal discomfort during heat waves. The microclimate model is built upon a computational fluid dynamics (CFD) model for solving the turbulent air, heat and moisture flow in the air domain of a street canyon. The CFD model is coupled to a model for heat and moisture transport in porous urban materials and to a radiative exchange model, determining the net solar and thermal radiation on each urban surface. A two-layer pavement system, previously optimized for maximal evaporative cooling applying the principles of capillary pumping and capillary break, is considered to design a smart wetting protocol answering the questions “when,” “how much,” and “how long” a pavement should be artificially wetted. It was found for the current optimized pavement solutions that a daily amount of 6 mm wetting over 10 min in the morning, preferentially between 8:00 and 10:00, guarantees a maximal evaporative cooling for 24 h during a heat wave.

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Section: Coupling Approachmentioning

confidence: 99%

Smart wetting of permeable pavements as an evaporative-cooling measure for improving the urban climate during heat waves

Kubilay¹,

Ferrari²,

Derome

et al. 2020

Journal of Building Physics

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“…The BES-CFD coupling can be of a dynamic type when both programs work together, exchanging information at each moment, or static when the programs work using the information received from the other, but they work independently. These benefits include reduced time and computational resources of convergence in CFD, more exact heat transfer coefficients used in BES, and better estimation of building energy requirements compared to standalone BES simulations [61]. In this study, a static coupling was implemented where the TRNSYS building modeling software implements the data obtained from the CFD numerical modeling through the following procedure:…”

Section: Bes-cfd Couplingmentioning

confidence: 99%

Refurbishment of a Social Interest Building in Mexico Using Earth-to-Air Heat Exchangers

et al. 2023

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The refurbishment of a social interest building using Earth-to-Air Heat Exchanger (EAHE) was studied in representative dry climatic conditions of Mexico (dry, very dry, temperate, and sub-temperate). A simulation method that uses both computational fluid dynamics (CFD) and building energy simulation (BES) was used to analyze the influence of the EAHE on the indoor conditions of a room. First, CFD simulations of the EAHE were performed using climatic data and soil properties of the four representative cities, and then the results were loaded into the TRNSYS software to estimate the indoor air temperature and the building room’s thermal loads. When connected to a building room on a warm day, the EAHE reduced the indoor air temperature by a factor ranging between 1.7 and 3.2 °C, while on a cold day, the EAHE increased the indoor air temperature of the room by between 1.0 and 1.9 °C. On the other hand, the EAHE reduced the daily cooling load of the room by a factor between 2% and 6%. The EAHE also reduced the daily heating load by between 0.3% and 11%. Thus, EAHE as a refurbishment technology can benefit social interest buildings in Mexico.

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“…The different characteristics of these two groups make them difficult to combine in one single workflow for simulations, although it is required in order to compute microclimate effects on building energy simulations. This approach linking different tools is called Hybrid, and has been a recent focus among the research community (Rodríguez-Vázquez et al, 2020). By coupling BES and CFD tools it is possible to improve the results and capabilities of the analysis.…”

Section: State Of the Artmentioning

confidence: 99%

Simulation workflow for considering the outdoor microclimate in building energy modeling

2023

Proceedings of the 11th International Workshop on Simulation for Energy, Sustainable Development &Amp; Environment, SESDE

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In order to accurately analyze building energy performance, it is important to take into account the outdoor microclimate. However, this can be challenging when different microclimates affect the same building using existing simulation tools. This study proposes a method to combine a Computational Fluid Dynamics (CFD) tool for microclimate simulation and a Building Energy Simulation (BES) tool for energy performance analysis within the Grasshopper interface. The method was tested in a case study involving a courtyard, which is a well-known example of microclimate affecting buildings. Results showed that considering the microclimate can significantly alter simulation results, reaching differences of 11% in energy transmitted through exterior wall, and 18% through the windows, the most affected elements, in some rooms. The total energy load of the room generally increased in the upper level of the house and was reduced in the lower level. This study is particularly relevant for practitioners in Spain, where the BES software used is required by the government for energy certification of buildings.

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Coupling building energy simulation and computational fluid dynamics: An overview

Cited by 18 publications

References 71 publications

Smart wetting of permeable pavements as an evaporative-cooling measure for improving the urban climate during heat waves

Smart wetting of permeable pavements as an evaporative-cooling measure for improving the urban climate during heat waves

Refurbishment of a Social Interest Building in Mexico Using Earth-to-Air Heat Exchangers

Simulation workflow for considering the outdoor microclimate in building energy modeling

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