Predicting single sided natural ventilation rates in buildings

Dascalaki, Elena G.; Santamouris, M.; Argiriou, Athanassios A.; Helmis, C. G.; Asimakopoulos, D. N.; Papadopoulos, Kyriakos; Soilemes, A. T.

doi:10.1016/0038-092x(95)00057-x

Cited by 67 publications

(9 citation statements)

References 6 publications

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“…But this empirical relation is very sensitive to the value of and the locations of measuring Δ . Dascalaki et al [6] stated that for large external openings, where the impact of the wind on the air flow was not negligible, there were no appropriate methodologies to calculate the values of and this introduced an important source of uncertainty. Moreover, this empirical relation does not take the ventilation type, window location, and wind direction into account.…”

Section: Resultsmentioning

confidence: 99%

“…Cermak et al [4] reviewed the requirements for similarity of natural ventilation in wind tunnel models and experimental methods for evaluating its effectiveness. Based on the design and position of the opening, a natural ventilation system can be divided into two categories such as the cross ventilation [5] and the single-sided ventilation [6]. Air is naturally driven in/out of the building due to the pressure and/or the temperature differences across the openings which result from the winddriven force and/or the buoyancy-driven force.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Lateral Window Position and Wind Direction on Wind-Driven Natural Cross Ventilation of a Building: A Computational Approach

Bangalee

Miau

Lin

et al. 2014

Journal of Computational Engineering

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Energy is saved when an effective natural ventilation system can provide comfort air to the occupants in a building by replacing a mechanical ventilation system. It also minimizes the risk of the environmental pollution and the global warming. A one story, full scale building was considered to carry out a comparative study of three different cases of wind-driven natural (WDN) cross ventilation with the help of computational fluid dynamics (CFD). In each case, the location of window was changed in lateral direction to predict the probable position for optimum ventilation performance and the angle of wind was varied to check the sensitivity of the wind direction on the flow field. After validating the current methodology through two satisfactory comparisons with the experimental investigations, the governing equations subjected to the corresponding boundary conditions were solved using commercial software and then the results were analyzed. A better location for the windows in each case was proposed. The ventilation purpose was served quite well even if the wind angle was changed in a moderate range from the original design. Furthermore, the velocity components, ventilation rate, surface pressure, ventilation time, and so forth in each case were investigated and compared extensively with those in other cases.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Lateral Window Position and Wind Direction on Wind-Driven Natural Cross Ventilation of a Building: A Computational Approach

Bangalee

Miau

Lin

et al. 2014

Journal of Computational Engineering

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“…Finally, test cells can be used as office-like spaces, for tests on visual comfort, ventilation effectiveness or thermal comfort (e.g. [6], [21][22][23][24][25][26][27][28]), taking into account that test cells present certain geometric features that may not be extended to all types of offices. In the case of tests on ventilation strategies, the assumption on air temperature uniformity must be abandoned and advanced numeric tools such as Computational Fluid Dynamic may be used.…”

Section: Main Uses Of Outdoor Test Cell Facilitiesmentioning

confidence: 99%

“…In particular, an extensive validation work has been conducted in a PASSYS test cell in Athens, partly within the frame of PASCOOL CEC Research Programme. A wide array of configurations of single sided natural ventilation are studied by Dascalaki et al [21] in a naturally-ventilated office building and in a PASSYS test cell facility. Ventilation measurements were done using a tracer gas (N2O) decay technique and wind speed measurements and comparisons are made against predictions by airflow networks models.…”

Section: Validation Of Simulation Programsmentioning

confidence: 99%

Outdoor test cells for building envelope experimental characterisation – A literature review

Cattarin

Causone

Kindinis³

et al. 2016

Renewable and Sustainable Energy Reviews

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In the past decades the construction sector experienced the diffusion of a wide variety of complex building envelope components and passive elements and strategies, characterized by a dynamic response to the climatic parameters. Many of these components have been claimed to contribute to reducing building energy use and improving occupants' comfort. These kind of envelope elements need nevertheless to be tested under laboratory and real dynamic weather conditions in order to characterise, and possibly to model, their behaviour and their effectiveness both in terms of energy saving and indoor environmental quality. Both indoor laboratories and outdoor test cells have been developed in order to tackle the challenging issue of experimentally characterising innovative envelope elements. However, not always the experimental methodologies are fully and explicitly described in the available literature, and they are rarely compared to other types of experimental procedures. The aim of the present paper is to describe and review recent state of the art technologies for outdoor test cells. The paper starts with a short introduction on potentialities and limitations of outdoor facilities with respect to indoor laboratories and real buildings field tests, and it continues with a detailed classification and description of the most relevant outdoor test cells developed in recent years.

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“…3, the width of the window is constant, and the flow rate changes depending on the window opening rate which is increased by the on/off control of the windows. At this time, when the mass flow rate from Zone 1 to Zone 2 is ̇1 2 and the mass flow rate from Zone 2 to Zone 1 is ̇2 1 , each mass flow rate is calculated by the following equation [6,7]. …”

Section: Window Opening Modelmentioning

confidence: 99%

Simulation of thermal environment in a three-layer vinyl greenhouse by natural ventilation control

et al. 2017

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Abstract. A high energy, efficient, harmonious, ecological greenhouse has been highlighted by advanced future agricultural technology recently. This greenhouse is essential for expanding the production cycle toward growth conditions through combined thermal environmental control. However, it has a negative effect on farming income via huge energy supply expenses. Because not only production income, but operating costs related to thermal load for thermal environment control is important in farming income, it needs studies such as a harmonious ecological greenhouse using natural ventilation control. This study is simulated for energy consumption and thermal environmental conditions in a three-layered greenhouse by natural ventilation using window opening. A virtual 3D model of a three-layered greenhouse was designed based on the real one in the Gangneung area. This 3D model was used to calculate a thermal environment state such as indoor temperature, relative humidity, and thermal load in the case of a window opening rate from 0 to 100%. There was also a heat exchange operated for heating or cooling controlled by various setting temperatures. The results show that the cooling load can be reduced by natural ventilation control in the summer season, and the heat exchange capacity for heating can also be simulated for growth conditions in the winter season.

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Predicting single sided natural ventilation rates in buildings

Cited by 67 publications

References 6 publications

Effects of Lateral Window Position and Wind Direction on Wind-Driven Natural Cross Ventilation of a Building: A Computational Approach

Effects of Lateral Window Position and Wind Direction on Wind-Driven Natural Cross Ventilation of a Building: A Computational Approach

Outdoor test cells for building envelope experimental characterisation – A literature review

Simulation of thermal environment in a three-layer vinyl greenhouse by natural ventilation control

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