Experimental and Numerical Study of Collector Geometry Effect on     Solar Chimney Performance

Shyaa, Aseel K.; Albaldawi, Rafea A. H.; Abbood, Maryam Muayad

doi:10.22153/kej.2016.05.002

Cited by 8 publications

(9 citation statements)

References 5 publications

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“…In recent years, different solutions to increase the thermal conductivity of PCM have been studied such as using micro-/nano-encapsulation [64,65], thermally conductive additives [66], highly conductive polymers and composites [67], extended heat transfer surfaces (e.g. fin, honeycomb, and heat pipe) [68], and metal matrices [69]. This study will consider the use of macro-encapsulation in thin aluminum containers in order to increase the TES capacity incorporated in the building as well as the thermal conductivity of the PCM.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Energy Demand Flexibility of a Radiant Cooling System With Thermal Energy Storage

Gallardo

2024

Preprint

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<p>The accelerated growth of renewable energies in recent years has made it necessary to implement Demand-Side Management (DSM) strategies that can help to adjust the energy demand according to energy production. In the context of DSM, buildings can play a significant role as they consume almost 40% of the energy use worldwide and show a significant potential for implementing energy demand flexibility measures. DSM strategies in buildings generally rely on short-term heat storage in structural thermal mass. However, the Thermal Energy Storage (TES) capacity is limited by the available thermal mass in dense building elements. In addition, the structural thermal mass generally has low heat storage and release rate (passive system), limiting the ability to manage building thermal loads. To overcome these limitations, a flexible heating and cooling system that can be installed in office buildings to replace the conventional all-air system was proposed and evaluated in this study. The system utilizes the high TES capacity of macro-encapsulated Phase Change Materials (PCM) discreetly incorporated below the serpentine copper coil of a standard Radiant Ceiling Panel (RCP), which allows shifting the energy demand for conditioning buildings. At first, the thermal storage properties of the TES units were determined using the standard ASTM C1784-20. Then, a walk-in dual climate chamber was used to experimentally evaluate the ability of the Radiant Ceiling Panel incorporating macro-encapsulated PCM (RCP-PCM) to shift heating/cooling loads to off-peak hours, measure its heat removal capacity, and the resulting indoor thermal environment. The obtained properties and the measurements from the experimental and field studies were used to validate a whole-building simulation model. The validated model was used to develop a simplified method for designing and controlling a RCP-PCM system. The validated model was also used to evaluate the energy demand flexibility potential of office buildings conditioned by the proposed system. Three different performance indicators were used to quantify energy demand flexibility: available TES capacity, storage efficiency, and power shifting capacity. The results of this study indicate that the RCP-PCM system can effectively shift the heating/cooling loads to off-peak hours while maintaining acceptable thermal comfort conditions during typical office occupancy hours (8:00 to 18:00). This load-shifting capability of the RCP-PCM system can be of great help in planning DSM strategies for increased penetration of renewable electricity in building heating and cooling applications.</p>

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Energy Demand Flexibility of a Radiant Cooling System With Thermal Energy Storage

Gallardo

2024

Preprint

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“…The authors reported the calculated energy transport parameter, 𝒎 ̇ Shyaa (2002) constructed a setup consisting of a 6.5-m tall chimney and a 6-m collector diameter in Baghdad, Iraq. The collector height is adjustable at two points: the center and the periphery, which allows the whole collector to be raised by an even height.…”

Section: Review Of Experimental Work With Varying Inlet Heightmentioning

confidence: 99%

“…Summary of geometry details from experiments, with the range of tested Hcan/Dcol ratio and the best equivalent Hcan/Dcol ratio reported in each work (Shyaa 2002;Kasaeian et al 2011;Bugutekin 2012;and Ghalamchi et al 2016).…”

Section: Tablementioning

confidence: 99%

Critical interpretation and analysis to correlate the canopy height to collector diameter ratio for optimized design of solar chimney power plants

Abdul Jamil,

Al-Kayiem,

Al-Azawiey

et al. 2023

Int. J. Renew. Energy Dev.

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The collector's periphery height determines the entrance size to the solar chimney power plant. There is inconsistency in the published experimental and numerical results on the optimum collector inlet height for different collector diameters. This paper aims to analyze the available data to identify the best collector inlet height-to-diameter ratio and to introduce a design guide for an optimized performance of solar chimney power plants. The experimental data reported in previous works have been clustered and manipulated to produce a comparative argument on the collector inlet height-to-diameter. In addition, a numerical model is developed to support the literature conclusions and to produce further data to decide the optimum collector inlet height-to-diameter ratio. For a 6.6-m collector diameter, four different inlets have been investigated, namely, 0.05, 0.1, 0.15, and 0.2 m. The best performance in terms of air velocity and temperature rise is obtained with the 0.05-m inlet height, where it shows an improvement of up to 35.35% compared to the larger inlet heights. The lower collector inlet height allows a more effective heat transfer from the ground and the collector to the air. It is concluded that the optimum collector inlet height-to-diameter design ratio for solar chimneys with collector diameters larger than 3 m is 0.0075±0.0005. For small-scale solar chimney models with less than 3 m collector diameter, the best collector inlet height-to-diameter ratio ranges between 0.015 and 0.03.

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“…This prototype was operated for eight years with overall electrical power of about 50 kilowatts [13]. Since the successful technology of the Manzanraes prototype, many small prototypes of the solar chimney systems have been installed in different regions around the world; in China, Brazil, Turkey, India, Northern Mongolia, Syria, Egypt, Jordan, USA and Algeria [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Al-Kayiem et al, [30], presented a novel solar chimney layout, which is installed over the roof of a small room.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Solar Chimney Power Plant

Bakri

Benguesmia

Nasraoui

et al. 2023

ARFMTS

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Solar chimney power plants are passive thermal systems that use the greenhouse effect to produce electricity from solar radiation (SR). The performance of these devices varies from one climate to another. Indeed, the building site of the SCPP is a particular parameter for its total effectiveness. The aim of this work was to present an experimental investigation of a solar chimney prototype under the climatic conditions of Sfax, Tunisia. In fact, Sfax is characterized by its arid and sunny climate. The impact of the climatic conditions of Sfax city on the aero-thermal characteristics of the considered prototype is carried out. Particularly, the variations of the fluid temperature and velocity are carried out under different times. The present outcomes show that the solar chimney power plant is an applicable device in the Tunisian region of Sfax.

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Experimental and Numerical Study of Collector Geometry Effect on Solar Chimney Performance

Cited by 8 publications

References 5 publications

Evaluation of the Energy Demand Flexibility of a Radiant Cooling System With Thermal Energy Storage

Evaluation of the Energy Demand Flexibility of a Radiant Cooling System With Thermal Energy Storage

Critical interpretation and analysis to correlate the canopy height to collector diameter ratio for optimized design of solar chimney power plants

Experimental Study of Solar Chimney Power Plant

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