Development of a simulation analysis environment for ventilated slab systems

Park, Benjamin; Krarti, Moncef

doi:10.1016/j.applthermaleng.2015.04.065

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…In other words, a longer air path results in a higher quantity of heat being exchanged with the slab. The same conclusion was obtained by Park and Krarti (2015), who found an asymptotic value for both heating and cooling modes.…”

Section: Introductionsupporting

confidence: 85%

“…Since the pipes are regularly spaced, there is no need to model the whole slab, provided that there is no heat transfer at the sides (the so-called thermal bridges). It is acknowledged, however, that the latter might be sizeable, as underlined by (Park and Krarti, 2015). Here, the modelling of the slab will focus on a single elementary part and, thanks to its symmetry, only half of that part will actually be modeled.…”

Section: Figure 3: Ventilated Slab Dimensions and Identification Of An Elementary Part Of The Slabmentioning

confidence: 99%

“…They found that this parameter was meaningful at low ventilation rate but its influence diminished strongly as the airflow rate increased. A wider range of core depths was tested at low velocities (Park and Krarti, 2015) and illustrated the non-negligible influence of this parameter on the average heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Indoor thermal behaviour of an office equipped with a ventilated slab: a numerical study

Labat

Hazyuk

Cézard

et al. 2021

Journal of Building Performance Simulation

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Ventilated slabs are used to provide indoor comfort by taking advantage of thermal inertia. The underlying difficulty is that the computational cost is high, which is hardly compatible with an exhaustive study of dynamic behavior at room scale. This paper presents a methodology for obtaining a lumped model based on the identification of the transfer functions for constant airflow rate systems.The transfer functions were combined into a state space model, which is able to obtain the main heat fluxes with good accuracy at a much lower computational cost. The study moved to room scale in order to further understand how a ventilated slab influences the heat balance. Increasing the number of ducts promoted better indoor temperature stability but the impact was slight. The mass flow rate, on the other hand, appeared to be crucial. This result underlines the need to tailor a control law specifically to the ventilated slab.

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Section: Introductionsupporting

confidence: 85%

Section: Figure 3: Ventilated Slab Dimensions and Identification Of An Elementary Part Of The Slabmentioning

confidence: 99%

See 1 more Smart Citation

Indoor thermal behaviour of an office equipped with a ventilated slab: a numerical study

Labat

Hazyuk

Cézard

et al. 2021

Journal of Building Performance Simulation

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“…Heat transfer process of the building construction. ts q is the transmitted solar radiation through the fenestration absorbed by the interior surface.In this model, a simplified interior solar distribution model developed by Benjamin and Moncef Krarti[37] is employed to calculate the transmitted solar radiation absorbed by the floor and other interior surfaces, respectively.The transmitted solar radiation absorbed by the floor can be expressed as…”

mentioning

confidence: 99%

Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Wang

Lei

et al. 2019

Energies

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Passive solar technologies are traditionally considered as cost-effective ways for the building heating. However, conventional passive solar buildings are insufficient to create a relatively stable and comfortable indoor thermal environment. To further increase the indoor air temperature and reduce the heating energy consumption, a hybrid heat collecting facade (HHCF) is proposed in this paper. To analyze the thermal performance of the HHCF, a heat transfer model based on the heat balance method is established and validated by experimental results. Meanwhile, the energy saving potential of a room with the HHCF is evaluated as well. When the HHCF is applied to places where heating is required in the cold season while refrigeration is unnecessary in hot season, the HHCF can reduce the heating need by 40.2% and 21.5% compared with the conventional direct solar heat gain window and the Trombe wall, respectively. Furthermore, a series of parametric analyses are performed to investigate the thermal performance of the room with HHCF under various design and operating conditions. It is found that the thermal performance of the HHCF mainly depends on the window operational schedule, the width and the absorptivity of heat collecting wall, and the thermal performance of the inner double-glass window. The modeling and the parametric study in this paper are beneficial to the design and the optimization of the HHCF in passive solar buildings.

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“…The use of convection, specifically ventilation activated thermal mass, has been explored in a variety of literature and has found positive results in increasing thermal exchange between incoming air flows and thermal storage media. A simulated study conducted by Park & Krarti (2015) found that the heat transfer rate between the hollow core slab and room air is directly proportional to the temperature difference between the ventilation air and the slab. The study also found a linear relationship between inlet air temperature and heat flux, as well as a logarithmic relationship between air inlet velocity and heat flux (i.e.…”

Section: 3: Ventilation and Thermal Mass (Forced Convection)mentioning

confidence: 99%

Commercial Building Thermal Mass Precooling for Conditioning Reduction Under the Operative Temperature Metric

Raghubar¹

2023

Preprint

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Building thermal mass precooling is highly variable due to the uncertainty of the convective heat transfer coefficient, and current research neglects the radiative cooling effects of reduced interior surface temperatures. The research presented aims to address the shortcomings of current research by modelling night ventilation through concrete slab hollow cores, increasing confidence in the heat transfer coefficient estimate; and modelling the operative temperature experienced by an occupant in an open office with simplified geometry. The cooling load of a baseline non-ventilated slab was determined through a custom numerical model and the operative temperature of the baseline was assigned to the same model with hollow core slab ventilation to determine the ambient air setpoint temperature associated cooling load. The ventilated model was found to achieve 35% cooling energy savings compared to the baseline, with compromised occupant comfort in the early morning, and improved occupant comfort for the rest of the day.

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Development of a simulation analysis environment for ventilated slab systems

Cited by 20 publications

References 16 publications

Indoor thermal behaviour of an office equipped with a ventilated slab: a numerical study

Indoor thermal behaviour of an office equipped with a ventilated slab: a numerical study

Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Commercial Building Thermal Mass Precooling for Conditioning Reduction Under the Operative Temperature Metric

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