Buoyancy-driven exchange flow between two adjacent building zones connected with top and bottom vents

Nabi, Saleh; Flynn, M. R.

doi:10.1016/j.buildenv.2015.04.031

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…The performance of indoor buoyancy-driven natural ventilation can be evaluated by analytical methods, experimental measurements, and numerical simulations [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Methods For Predicting Indoor Buoyancy-driven Natural Ventil...mentioning

confidence: 99%

Review on buoyancy-driven natural ventilation in an enclosure with various types of heat sources

et al. 2022

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This paper reviews indoor heat convection and buoyancy-driven natural ventilation in enclosed space with heat sources in different forms such as point, line, plane, volume or combination of them. The indoor thermal flow is driven by these heat sources and accumulated in the enclosure. Thermal plume evolves based on its dynamic law above heat sources and is conversely affected by the thermal environment and geometric structure. Therefore, the dynamic of thermal-driven flows and the restriction by the thermal environment and geometric framework are both of interest in the field of indoor heat convection and buoyancy-driven natural ventilation. Based on this fact, the indoor thermal convection can be divided into two basic components which are buoyant plume above the heat source and indoor thermal stratification flow. Research and analysis on these laws and restriction are of significance in not only the advances in building thermal environment technology but also further cognition and effective solutions for current engineering practice.

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Section: Methods For Predicting Indoor Buoyancy-driven Natural Ventil...mentioning

confidence: 99%

Review on buoyancy-driven natural ventilation in an enclosure with various types of heat sources

et al. 2022

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“…where g is the acceleration due to gravity, W is the heat flux, ρ is the fluid density, C p is the fluid's specific heat capacity and β 00 is the coefficient of volumetric expansion (for ideal gases β 00 ≈ 1/T ). There is one major difference between this setting and the traditional displacement flow for which ventilation occurs when the dense fluid enters at the bottom and displaces the lighter fluid within the space which in turn flows out through the openings at the top [26,33]. We assume that the space, for simplicity chosen to be a two-dimensional cavity with bottom and top vents, is subjected to a prescribed inflow provided by an air conditioning unit or a mechanical machine.…”

Section: Analytical Model For Displacement Ventilationmentioning

confidence: 99%

Adjoint-based optimization of displacement ventilation flow

Nabi

Grover

Caulfield

2017

Building and Environment

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We demonstrate the use of the 'Direct-Adjoint-Looping method' for the identification of optimal buoyancy-driven ventilation flows governed by Boussinesq equations. We use the incompressible Reynoldsaveraged Navier-Stokes (RANS) equations, derive the corresponding adjoint equations and solve the resulting sensitivity equations with respect to inlet conditions. We focus on a displacement ventilation scenario with a steady plume due to a line source. Subject to an enthalpy flux constraint on the incoming flow, we identify boundary conditions leading to 'optimal' temperature distributions in the occupied zone. Our results show that depending on the scaled volume and momentum flux of the inlet flow, qualitatively different flow regimes may be obtained. The numerical optimal results agree with analytically obtained optimal inlet conditions available from classical plume theory in an 'intermediate' regime of strong stratification and two-layer flow.

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A simulation study of ventilation and indoor gaseous pollutant transport under different window/door opening behaviors

Liang

Qin

2016

Build. Simul.

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Buoyancy-driven exchange flow between two adjacent building zones connected with top and bottom vents

Cited by 5 publications

References 31 publications

Review on buoyancy-driven natural ventilation in an enclosure with various types of heat sources

Review on buoyancy-driven natural ventilation in an enclosure with various types of heat sources

Adjoint-based optimization of displacement ventilation flow

A simulation study of ventilation and indoor gaseous pollutant transport under different window/door opening behaviors

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