Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer
A new mathematical model for buoyancy-driven ventilation [Sandbach SD, Lane-Serff GF. Transient buoyancy-driven ventilation: Part 1. Modelling advection. Building and Environment, 2011] is modified to include heat transfer at the boundaries. Heat transfers at the ceiling and floor are included, using Newton's law of cooling to model convective heat transfer between the air and the solid boundaries, Fourier's law to model conductive heat transfer through the floor and ceiling, and a linear version of the Stefan-Boltzmann law to model radiative heat transfer from the ceiling to the floor. The effectiveness of the model was assessed using experimental results obtained in a full-scale test room. In these experiments, the vertical temperature stratification was measured using an array of T-type thermocouples. Speed measurements were obtained to estimate the ventilation flow rate (for displacement ventilation) and the velocity profile across the doorway (for doorway ventilation). Buoyancy was introduced using a twin-hob (∼2.35. kW) heat source, and in most cases a diffuse two-layer temperature stratification developed. The results from these experiments are compared with the model and existing adiabatic models. Our results indicate that the effect of heat transfer at the boundaries on the final stratification is significant and should not be ignored. Furthermore, direct comparisons between the measured and modelled results are in general very good. © 2011 Elsevier Ltd.
Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer
A new mathematical model for buoyancy-driven ventilation [Sandbach SD, Lane-Serff GF. Transient buoyancy-driven ventilation: Part 1. Modelling advection. Building and Environment, 2011] is modified to include heat transfer at the boundaries. Heat transfers at the ceiling and floor are included, using Newton's law of cooling to model convective heat transfer between the air and the solid boundaries, Fourier's law to model conductive heat transfer through the floor and ceiling, and a linear version of the Stefan-Boltzmann law to model radiative heat transfer from the ceiling to the floor. The effectiveness of the model was assessed using experimental results obtained in a full-scale test room. In these experiments, the vertical temperature stratification was measured using an array of T-type thermocouples. Speed measurements were obtained to estimate the ventilation flow rate (for displacement ventilation) and the velocity profile across the doorway (for doorway ventilation). Buoyancy was introduced using a twin-hob (∼2.35. kW) heat source, and in most cases a diffuse two-layer temperature stratification developed. The results from these experiments are compared with the model and existing adiabatic models. Our results indicate that the effect of heat transfer at the boundaries on the final stratification is significant and should not be ignored. Furthermore, direct comparisons between the measured and modelled results are in general very good. © 2011 Elsevier Ltd.
Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer
Sandbach, Steven D. (Autor:in) / Lane-Serff, Gregory F. (Autor:in)
01.08.2011
Sandbach , S D & Lane-Serff , G F 2011 , ' Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer ' Building and Environment , vol 46 , no. 8 , pp. 1589-1599 . DOI:10.1016/j.buildenv.2011.01.019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Buoyancy , Planning and Development , /dk/atira/pure/subjectarea/asjc/2200/2205 , Displacement , Heat transfer , /dk/atira/pure/subjectarea/asjc/2200/2215 , Ventilation , /dk/atira/pure/subjectarea/asjc/2300/2305 , Civil and Structural Engineering , Environmental Engineering , Structural and Fire Engineering , Doorway , /dk/atira/pure/subjectarea/asjc/3300/3305 , /dk/atira/pure/core/keywords/library/01/09 , Building and Construction , Geography , Modelling
DDC:
690
Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer
| Online Contents | 2011
Transient buoyancy-driven ventilation: Part 2. Modelling heat transfer
| British Library Online Contents | 2011
Transient buoyancy-driven ventilation: Part 1. Modelling advection
| Online Contents | 2011
Transient buoyancy-driven ventilation: Part 1. Modelling advection
| British Library Online Contents | 2011