Thermal analysis of light pipes for insulated flat roofs

Šikula, Ondřej; Mohelníková, Jitka; Plášek, Josef

doi:10.1016/j.enbuild.2014.09.044

Cited by 24 publications

(14 citation statements)

References 19 publications

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“…The detailed calculation of linear thermal transmittance in case of contact external peripheral wall and plastic window frame [11] or the impact of freezer room operation on changes of temperature fi eld in subsoil within both steady-state and transient boundary conditions [12] were performed in software CalA. The comparison of results of software CalA and ANSYS Fluent is also performed [13]. This case study is aimed at transient simulation of fl oor heating systems.…”

Section: Calculation Methodsmentioning

confidence: 99%

Transient simulation study of floor heating systems

Horka

Hirš

2019

IRASE

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This case study is aimed at transient simulation of floor heating systems. There is comparison of surface floor temperatures and heat fluxes changes of different systems over time. The first studied system is a dry floor heating system which consists of system boards made from insulation material, spreader plates, and it is covered by cement fiber boards. The second examined system is heavy wet concrete floor heating system whose heating power is set identically as heating power of dry floor heating system. Mean temperature of heating water is investigated. All simulations, both time steady-state and transient, are performed in software CalA. Reduction of duration and computational performance of simulation is achieved by creation of a surrogate model. The surrogate model evinces identical surface temperatures and heat fluxes. Total number of computational grid is reduced and therefore lower number of equations is solved. Results show that dry floor heating system has faster response than concreate floor heating system. It is caused by lower weight and lower thermal capacity of this system.

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Section: Calculation Methodsmentioning

confidence: 99%

Transient simulation study of floor heating systems

Horka

Hirš

2019

IRASE

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“…Heat transfer and natural ventilation in light pipes were studied on models. 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].…”

Section: Thermal Evaluations Of Light Pipesmentioning

confidence: 99%

“…Emissivity of mirrored surfaces of the light pipe prototype is 0.05 [43]. The thermal monitoring was compared to infrared thermography monitoring for heat transfer models [44] and the previous studies of computer simulations of light pipes thermal profiles [27,28].…”

Section: Infrared Thermographymentioning

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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“…Light transmission efficiency of daylight guidance systems: An assessment approach based on simulations and measurements in a sun/sky simulator [21] Characterization of the photometric performance of tubular light guidance systems in terms of light Light Pipes Performance Prediction: inter model and experimental confrontation on vertical circular light-guides [22] Modeling and experimental analysis of vertical solar tubes Study of light-pipes for the use of sunlight in road tunnels: From a scale model to real tunnels [23] Evaluation of the application of light tubes in tunnel lighting Thermal analysis of light pipes for insulated flat roofs [24] Thermal analysis of solar tubes used in roofs Innovative daylighting systems challenges: A critical study [25] Analysis of existing natural light utilization technologies…”

Section: Title Informationmentioning

confidence: 99%

Proposal for an Experimental Methodology for Evaluation of Natural Lighting Systems Applied in Buildings

Spacek¹,

Neto²,

Bilessimo³

et al. 2017

Energies

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This work has the objective of developing a methodology for the evaluation of indoor natural lighting systems, which, with speed and practicality, provides from real conditions of use a reliable result about the quality and performance of the proposed system. The methodology is based on the construction of two real-size test environments, which will be subjected to a natural light system through reflexive tubes made from recycled material, and to a commercial system already certified and consolidated, creating the possibility of comparison. Furthermore, the data acquired in the test environments will be examined in light of the values of solar radiation obtained from a digital meteorological station, such that it is possible to stipulate the lighting capacity of the systems at different times of the year.

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Thermal analysis of light pipes for insulated flat roofs

Cited by 24 publications

References 19 publications

Transient simulation study of floor heating systems

Transient simulation study of floor heating systems

Thermal testing of the light pipe prototype

Proposal for an Experimental Methodology for Evaluation of Natural Lighting Systems Applied in Buildings

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