Experimental and numerical analysis of natural ventilation with combined light/vent pipes

Oliveira, Armando C.; Silva, António R.; Afonso, Clito; Varga, Szabolcs

doi:10.1016/s1359-4311(01)00053-9

Cited by 19 publications

(12 citation statements)

References 8 publications

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“…Tubular daylight guide systems combined with natural ventilation achieve green lighting projects and ventilation at the same time, as well as reduce illumination and ventilation energy consumption. 98,99 In addition, TDGSs combined with a solar water heater (SWH) take full advantage of the waste heat from the solar energy (Figure 10). 100…”

Section: Outlooksmentioning

confidence: 99%

Evaluation methods of the daylight performance and potential energy saving of tubular daylight guide systems: A review

Yuan

et al. 2021

Indoor and Built Environment

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In the past 30 years, tubular daylight guide systems (TDGSs) have become one of the most popular ways to transport outdoor natural light into the inner space in building design. However, tubular daylight guide systems are not widely used because of the lack of methods to evaluate methods on the suitability of the TDGSs. This study therefore summarizes the daylight performance metrics of TDGSs and presents the estimation methods in terms of field measurements, simulation and empirical formulae. This study focuses on the daylight performance and potential energy savings of TDGSs. Moreover, this study will be helpful for building designers to build healthy, comfortable and energy-saving indoor environment.

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Section: Outlooksmentioning

confidence: 99%

Evaluation methods of the daylight performance and potential energy saving of tubular daylight guide systems: A review

Yuan

et al. 2021

Indoor and Built Environment

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“…Computer fluid dynamic simulations aimed at the light pipe thermal profiles were analyzed [27][28][29][30]. The simulations and experimental studies were carried out for integrated daylight-ventilation pipes [31][32][33]. Energy of solar radiation absorbed into the light pipe was specified for the EnergyPlus software simulations [34].…”

Section: Thermal Evaluations Of Light Pipesmentioning

confidence: 99%

Thermal testing of the light pipe prototype

2019

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A light pipe prototype with a concentrating mirror parabolic head was tested for temperature profiles. The purpose of the testing was to find maximal temperature and estimate potential problems for overheating in the position of the pipe installation into roof structures. Infrared thermography monitoring of the light pipe prototype and temperature measurements give overview about the light pipe system temperature distribution. It was proven that the light pipe head temperature was increased for more than 100°C in thermally insulated structure under intensive infrared radiation.

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“…Two models, of laminar convection and a two-equation turbulence model k−ω Shear Stress Transport (SST) model [24] were compared [22,25]. The laminar model gives sufficiently correct results for lower Rayleigh numbers <10 9 . The laminar model was created in accordance with the already published articles focused on the laminar convection in air cavities [26,27].…”

Section: Physical Modelsmentioning

confidence: 99%

“…The guide light transmittance has been studied in experimental and theoretical models [6,7]. Computer simulations focused on thermal and air flow profiles of a special light guide system composed of two concentric tubes which combine daylighting and ventilation functions were run [8][9][10]. In a double shell light guide model for light/vent pipes, both stack and external wind effects were studied [11,12].…”

Section: Introductionmentioning

confidence: 99%

Thermal CFD Analysis of Tubular Light Guides

2013

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Tubular light guides are applicable for daylighting of windowless areas in buildings. Despite their many positive indoor climate aspects they can also present some problems with heat losses and condensation. A computer CFD model focused on the evaluation of temperature distribution and air flow inside tubular light guides of different dimensions was studied. The physical model of the tested light guides of lengths more than 0.60 m proves shows that Rayleigh numbers are adequate for a turbulent air flow. The turbulent model was applied despite the small heat flux differences between the turbulent and laminar model. The CFD simulations resulted into conclusions that the growing ratio of length/diameter increases the heat transmission loss/linear transmittance as much as by 50 percent. Tubular light guides of smaller diameters have lower heat transmission losses compared to the wider ones of the same lengths with the same outdoor temperature being taken into account. The simulation results confirmed the thermal bridge effect of the tubular light guide tube inside the insulated flat roof details. The thermal transmittance of the studied light guides in the whole roof area was substituted with the point thermal bridges. This substitution gives possibility for simple thermal evaluation of the tubular light pipes in roof constructions.

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Experimental and numerical analysis of natural ventilation with combined light/vent pipes

Cited by 19 publications

References 8 publications

Evaluation methods of the daylight performance and potential energy saving of tubular daylight guide systems: A review

Evaluation methods of the daylight performance and potential energy saving of tubular daylight guide systems: A review

Thermal testing of the light pipe prototype

Thermal CFD Analysis of Tubular Light Guides

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