Integrating CFD and building simulation

Barták, M Martin; Beausoleil-Morrison, Ian; Clarke, J.A.; Denev, Jordan A.; Drkal, F; Lain, M Milos; Macdonald, Iain; Melikov, Arsen Krikor; Popiołek, Zbigniew; Stankov, Peter

doi:10.1016/s0360-1323(02)00045-8

Cited by 100 publications

(64 citation statements)

References 8 publications

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“…However, in their studies, different coupling methods resulted in dramatically different results for the same airflow problem, which indicated multiple solutions of airflow coupling. Bartak et al (2002) refined the CFD module of ESP-r and summarized the form of the CFD model, described the method used to integrate the thermal and flow domains and reported the outcome from an empirical validation exercise. ) described the implementation of external coupling between building energy simulation and CFD.…”

Section: Simulation Of Temperature Distribution In a Room With Boundamentioning

confidence: 99%

A Review: Coupled Simulation of CFD and Network Model for Heat and Contaminant Transport in a Building

Kato

Zhang

2014

Journal of Asian Architecture and Building Engineering

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In this study, the coupled simulation of CFD (Computational Fluid Dynamics) and network model of building energy (heat) and airflow simulation is reviewed. The network model is a tool to describe the whole and macroscopic characteristics of heat or airflow transport in buildings, where heat flow or airflow is modeled as a network of one-dimensional flow elements. It can be conducted with comparatively less computational cost. The temperature or contaminant concentration of the room air is often not uniform but spatially distributed in a room, when the mixing efficiency of room airflow is not high enough, or when sources and respective sinks of heat or contaminant are located comparatively apart in a room. The CFD is a tool to describe these distribution characteristics precisely. It requires considerable computation amount and computational time. It is not light or simple to do compared with the network model computation. If one wants to analyze the whole and macroscopic characteristics of heat or flow transports in buildings including the distribution features of temperature or contaminant in a certain room, or if one wants to analyze the room airflow with the consideration of whole building heat and flow transport, the two simulations should be done simultaneously. In other words, they should be solved with the coupled manner. There are many methods or ways for coupling the two simulations. In this review, the authors divided the coupled simulations into two groups. One is the group of which the CFD analysis is the main objective, while the other is the group with network simulation as the main objective. In the latter case, even the major objective is obtained from the results of the network simulation, and the full coupling CFD and network simulation requires an enormous amount of computation and time compared with the single network simulation. The full coupling is practically absurd and is sometimes impossible because of its enormous computation amount. Further simplification of the coupling with CFD has to be pursued. The authors have reviewed the papers published in the recent 10 years on this topic and classified relevant works into the two categories mentioned above.

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Section: Simulation Of Temperature Distribution In a Room With Boundamentioning

confidence: 99%

A Review: Coupled Simulation of CFD and Network Model for Heat and Contaminant Transport in a Building

Kato

Zhang

2014

Journal of Asian Architecture and Building Engineering

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“…We used the LMA to measure the ventilation performance for the indoor air freshness [31]. The LMA is an indicator for the average time fresh air takes to reach an arbitrary point in the room from the entrance.…”

Section: Effect Of Overhang On Local Mean Age Of Airmentioning

confidence: 99%

“…The LMA is an indicator for the average time fresh air takes to reach an arbitrary point in the room from the entrance. We calculated the LMA based on the following model equation [31]:…”

Section: Effect Of Overhang On Local Mean Age Of Airmentioning

confidence: 99%

Enhanced Single-Sided Ventilation with Overhang in Buildings

2016

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Abstract:Enhancing the ventilation performance of energy-efficient buildings with single-sided openings is important because their ventilation performance is poor and strongly depends on the wind conditions. We considered an overhang as a potential building façade for improving the single-sided ventilation performance. We performed numerical simulations of three-dimensional unsteady turbulent flows over an idealized building with an overhang in order to investigate the effect of the overhang on the ventilation performance. Parametric studies were systematically carried out where the overhang length, wind speed, and wind direction were varied. The numerical results showed that the overhang drastically enhanced the ventilation rate in the windward direction regardless of the wind speed. This is because, for windward cases, the overhang produces a vortex with strong flow separation near the tip of the overhang, which promotes a net airflow exchange at the entrance and increases the ventilation rate. However, the ventilation rates for the leeward and side cases are slightly decreased with the overhang. Using an overhang with single-sided ventilation greatly reduces the local mean age of air (LMA) in the windward direction but increases it in the leeward direction.

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“…(Negrão 1998;Chen 2003, 2004;Zhai et al 2002), passive cooling through night ventilation (Leenknegt et al 2012), naturally ventilated rooms Wong 2008, 2009), evaluating the performance for PCM heat exchangers (Gowreesunker, Tassou, and Kolokotroni 2013) or adaptive coupling with conflation algorithm (Beausoleil-Morrison 2000; Bartak et al 2002) . Due to the continuous increase of the computational load, combining CFD and BES is becoming more and more popular.…”

Section: Coupling Building Energy Simulation and Cfdmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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Integrating CFD and building simulation

Cited by 100 publications

References 8 publications

A Review: Coupled Simulation of CFD and Network Model for Heat and Contaminant Transport in a Building

A Review: Coupled Simulation of CFD and Network Model for Heat and Contaminant Transport in a Building

Enhanced Single-Sided Ventilation with Overhang in Buildings

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

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