Modeling of the optimum tilt of a solar chimney for maximum air flow

Sakonidou, E. P.; Karapantsios, Thodoris D.; Balouktsis, A.; Chassapis, D.

doi:10.1016/j.solener.2007.03.001

Cited by 125 publications

(48 citation statements)

References 33 publications

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“…In order to calculate cooling energy needs of the thermal zone with systems A or B, three models published in the literature were used: i) the outlet air temperature of an EAHE [9], ii) the air flow induced by a solar chimney [10] and iii) the 5R1C hourly energy balance of ISO 13790 [5].…”

Section: Methodology To Set the Empirical Correlationsmentioning

confidence: 99%

“…The SC model lays on the work of Sakonidou et al [10] for a SC south oriented. To determine the air velocity inside de SC the following relation is used [11] …”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

“…The original model of Sakonidou et al [10] was modified in order to use hourly solar radiation available from weather climate data, instead of using calculation approximations. To determine the solar radiation absorbed by the SC black wall, the Snell formula was used …”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

“…The critical Rayleigh number, Ra c , designates the transition between laminar and turbulent flow and is obtained from the following approximation [10], with s expressed in degrees,…”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

“…The characteristics of SC elements, such as the glass and the black wall, are those adopted by Sakonidou et al [10] (see Table 2). For the theoretical functioning of the SC only the upward flow is considered, which occurs whenever the air temperature inside the solar chimney is higher than the thermal zone air temperature.…”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

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Passive Cooling Load Ratio method

Nunes

Panão

2013

Energy and Buildings

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The method Passive Cooling Load Ratio (PCLR) is an innovative simplified method which calculates the monthly cooling energy needs of a thermal zone where passive cooling systems are installed using the variables: cooling energy load and passive cooling potential. This new method is based on the Solar Load Ratio (SLR) that was previously developed for solar heating systems. Although, PCLR was theoretically developed for any passive cooling system, here it is applied to passive cooling based on ventilation strategies.In addition, this paper presents its application to an office room ventilation using: i) forced cooled air from an earth-to-air heat exchanger (EAHE) and ii) natural induced air by a solar chimney from the EAHE. Correlations were obtained for those systems, using the parameters that describe the local climate, the system type and its dimensions. The numerical model used to obtain the correlation functions when one of the systems is installed, associates previously developed numerical models with 5R1C model of ISO 13790.However, the PCLR method can be used to accurately estimate the cooling energy needs without using complex models for simulation. The error for all systems does not overcomes 5.2%, which is an acceptable variation for a

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Section: Methodology To Set the Empirical Correlationsmentioning

confidence: 99%

“…The SC model lays on the work of Sakonidou et al [10] for a SC south oriented. To determine the air velocity inside de SC the following relation is used [11] …”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

Section: Solar Chimney (Sc)mentioning

confidence: 99%

“…The critical Rayleigh number, Ra c , designates the transition between laminar and turbulent flow and is obtained from the following approximation [10], with s expressed in degrees,…”

Section: Solar Chimney (Sc)mentioning

confidence: 99%

Section: Solar Chimney (Sc)mentioning

confidence: 99%

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Passive Cooling Load Ratio method

Nunes

Panão

2013

Energy and Buildings

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Experimental and Numerical Study on the Integrated Solar Chimney System with Solar Still for Water Desalination

et al. 2023

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The integrated solar chimney and solar still system offers a promising approach for simultaneous water and electricity production. However, there have been only few experimental studies conducted on this combined design. In this regard, a solar chimney with 12 m height and 3.4 m collector diameter is constructed and accompanied with solar stills, installed inside the collector. The maximum velocity at the chimney's inlet for the combined system reaches near 2 m s−1, while it is 0.3 m s−1 smaller than the conventional arrangement. The maximum water production is 861 g h−1 which is attained in the evening hours. In the normal solar chimney without solar stills, air temperature inside the collector reaches its peak at 64 °C when solar radiation is maximum. While in the integrated system, this value is 59 °C which reaches with 2 h delay due to water heat storage. In addition, it is found that the effect of height of vapor space inside the basin can be negligible while the lower water depth in the basin provides higher water production.

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Feasibility study on applications of solar chimney and earth tube systems for BEAM/LEED assessment

Zhou

2016

Int. J. Energy Res.

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SUMMARYBuilding Environment Assessment Method (BEAM) and Leadership in Energy and Environmental Design (LEED) aim to promote better environment performance of buildings in their life time. This study explores innovative solutions to achieve key requirement of Energy Use (EU) and Indoor Environmental Quality (IEQ) from BEAM/LEED assessments by Solar Chimney (SC) or Earth Tube (ET). EnergyPlus is used to perform the simulation of building's ventilation and energy usage under the typical Hong Kong's weather data. It was found that the SC performance is affected by the building's dimension and orientation and is also determined by solar availability and absorber surface temperature. In most simulation cases, SC provided sufficient natural ventilation, but it also increased cooling load to the space when ambient temperature was higher than indoor. The ET performance was affected by the pipe dimension and buried depth. It was found that a single ET could decrease cooling load to the space in the summer design day 'July 21' in Hong Kong, but it could not provide sufficient outdoor fresh air. The result also demonstrated that both SC and ET systems had capabilities to help achieve on-site renewable energy requirements from BEAM/LEED because of their energy saving capacities on ventilation and thermal comfort. Because SC had higher capability to provide sufficient ventilation, SC could more significantly contribute on the sections pertinent to building ventilation in BEAM/LEED assessments. Because ET had higher capability to save cooling energy, ET could more significantly contribute on the sections pertinent to energy saving in BEAM/LEED assessments.

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Modeling of the optimum tilt of a solar chimney for maximum air flow

Cited by 125 publications

References 33 publications

Passive Cooling Load Ratio method

Passive Cooling Load Ratio method

Experimental and Numerical Study on the Integrated Solar Chimney System with Solar Still for Water Desalination

Feasibility study on applications of solar chimney and earth tube systems for BEAM/LEED assessment

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