Solar chimney for enhanced stack ventilation

Bansal, N.K.; Mathur, Rajesh; Bhandari, Mahabir

doi:10.1016/0360-1323(93)90042-2

Cited by 235 publications

(79 citation statements)

References 4 publications

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“…The simplest model is Prandtl mixing length model. In this research, turbulent viscosity is denoted with local average velocity and length scale by the simple algebraic equation [9,10].…”

Section: (3)mentioning

confidence: 99%

“…Major uncertainty in the design of solar chimney is the effect of the geometrical structures, solar radiation and outdoor temperature. Unfortunately, we have little knowledge in determining those parameters for an efficient and effective design of the solar chimney natural ventilation systems [8,9]. This paper is focused on airflow and convective heat transfer inside the solar chimney.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer and Natural Ventilation Airflow Rates from Single-sided Heated Solar Chimney for Buildings

Jones

Zhao

et al. 2004

Journal of Asian Architecture and Building Engineering

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Heat transfer process and natural ventilation driven by a solar chimney attached to a sidewall of building are investigated with CFD technique (MITFLOW) in detail. In this paper, conditions and parameters studied in the modelling study are the cavity width of the solar chimney, the wall temperature, the height and breadth of the solar chimney, the ratio of outlet area to inlet area as well as the outlet location of the solar chimney. The ranges of calculation parameters focused on a solar chimney with single-sided solar collector (single-sided heated wall) cover following conditions: solar chimney length L = 0.5m~5.0m, breadth B=0.1m~0.5m, height H=2.0m~5.0m, and B/H=0.05~0.25. Heated wall surface temperature Tw is changed in the range of 30˚C~70˚C; the ratio of the outlet area to inlet area A r is changed in the range of 0.6~1.0. It is found that for given building geometry and inlet areas, there is an optimum cavity width at which a maximum airflow rate can be achieved. Based on the prediction, the airflow rate reaches maximum when B/H is approximately 1/10. It is also found that for given chimney geometry, solar chimney ventilation flow rate can be increased with the enhancement of chimney height only the cross sectional area no more than the critical area, because cross section area has a strong effect on the transitional and/or turbulent convective heat transfer in an enclosure. From the view of economy technology, the optimized height of a solar chimney can be determined according to the optimized section ratio of breadth to height and available breadth in practice. On the analysis of CFD prediction, it is noted that optimized ventilation flow rate can be obtained when the outlet area takes the same area as the inlet area. Generally, there is good agreement among the numerical results, available experimental data from literature and theoretical analysis of natural ventilation from the solar chimney.

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“…The simplest model is Prandtl mixing length model. In this research, turbulent viscosity is denoted with local average velocity and length scale by the simple algebraic equation [9,10].…”

Section: (3)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Natural Ventilation Airflow Rates from Single-sided Heated Solar Chimney for Buildings

Jones

Zhao

et al. 2004

Journal of Asian Architecture and Building Engineering

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“…The first mathematical modelling for the solar chimney (Trombe wall) design was given by Bansal et al, 1993 who also reported the concept of increasing the airflow by increasing solar irradiation. This theoretical study also reported an air change per hour with change in the coefficient of fluid (air) discharge.…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristics of Modelled Tri-Wing Solar Chimney and Adaptation to Wood Drying

Bello¹,

Ezebuilo²,

Eke³

et al. 2015

Solar Radiation Applications

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“…In the above equation, is the mean temperature approximation coefficient, the value of 0.74 has been suggested by Ong and Chow [19]; is the mean temperature inside channel, °C.…”

Section: Open Theoretical Modementioning

confidence: 99%

Heating performance of a solar chimney combined PCM: A numerical case study

Liu

2015

Energy and Buildings

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A c c e p t e d M a n u s c r i p t HIGHLIGHTS  The heating performance of the proposed system was numerically studied. Seven design and operating parameters of the proposed system were investigated. The first five parameters need to be carefully selected to maximize the performance. Thermal conductivity of absorber has less impact on the performance of the system.  Inlet air temperature is also an important factor in this study. ABSTRACTAn experimentally validated numerical model is developed to study the effects of seven design and operational parameters on the heating performance of a solar chimney incorporated with phase change material (PCM) in this paper. It is found that when the latent heat increases from 70 to 170 kJ/kg, the melting time is increased by 103% and freezing time is prolonged by 60%. If heat flux is increased by 33%, the melting time is reduced by 36.4%.Increasing thermal conductivity of the insulation material from 0.02 to 0.06 W/m K, the melting time is prolonged by 47.2 %. When absorptivity of the absorber is increased from 0.8 to 1.0, the melting time is decreased by 26.3 %. When transmissivity of the glass cover is increased by 25 %, the melting time is reduced by 26.7%. For the inlet air temperature, when Page 3 of 44 A c c e p t e d M a n u s c r i p t it decreases from 25 to 15 °C, the freezing time is shortened by 39 %. The melting time is only reduced by 8% when thermal conductivity of the absorber is increased by 25 times.Therefore, it can be concluded that the first six parameters have more impact on the system's performance. While the thermal conductivity of absorber slightly impacts it.Keywords: Solar chimney; Phase change material; Heating performance; Numerical study

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Solar chimney for enhanced stack ventilation

Cited by 235 publications

References 4 publications

Heat Transfer and Natural Ventilation Airflow Rates from Single-sided Heated Solar Chimney for Buildings

Heat Transfer and Natural Ventilation Airflow Rates from Single-sided Heated Solar Chimney for Buildings

Performance Characteristics of Modelled Tri-Wing Solar Chimney and Adaptation to Wood Drying

Heating performance of a solar chimney combined PCM: A numerical case study

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