Design evaluation of Earth-Air Heat Exchangers with multiple ducts

Brum, Ruth da Silva; Ramalho, Jairo Valões de Alencar; Rodrigues, Michel Kepes; Rocha, Luíz Alberto Oliveira; Isoldi, Liércio André; Santos, Elizaldo Domingues dos

doi:10.1016/j.renene.2018.09.063

Cited by 50 publications

(34 citation statements)

References 34 publications

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“…[38] 2020 FM and HT Geometric optimization and flow parameters modeling for subcooled flow boiling (two-phase flow) were performed, aiming to minimize the thermal resistance of the microchannel heat exchanger. [39] 2019 HT…”

Section: Reference Year Area Descriptionmentioning

confidence: 99%

Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load

Troina

Cunha

Pinto

et al. 2020

Metals

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Stiffened thin steel plates are structures widely employed in aeronautical, civil, naval, and offshore engineering. Considering a practical application where a transverse uniform load acts on a simply supported stiffened steel plate, an approach associating computational modeling, Constructal Design method, and Exhaustive Search technique was employed aiming to minimize the central deflections of these plates. To do so, a non-stiffened plate was adopted as reference from which all studied stiffened plate’s geometries were originated by the transformation of a certain amount of steel of its thickness into longitudinal and transverse stiffeners. Different values for the stiffeners volume fraction (φ) were analyzed, representing the ratio between the volume of the stiffeners’ material and the total volume of the reference plate. Besides, the number of longitudinal (Nls) and transverse (Nts) stiffeners and the aspect ratio of stiffeners shape (hs/ts, being hs and ts, respectively, the height and thickness of stiffeners) were considered as degrees of freedom. The optimized plates were determined for all studied φ values and showed a deflection reduction of over 90% in comparison with the reference plate. Lastly, the influence of the φ parameter regarding the optimized plates was evaluated defining a configuration with the best structural performance among all analyzed cases.

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Section: Reference Year Area Descriptionmentioning

confidence: 99%

Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load

Troina

Cunha

Pinto

et al. 2020

Metals

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“…The economic aspects of air-to-ground heat exchanger technique have been discussed by several researchers. Choudhury and Misra [77], Brum et al 2018 [78], Taurines [79], Yang et al [80], found that the EAHE technique is feasible and economically efficient while providing significant energy savings. Diaz et al [81] use a system based on flow logic to ensure energy savings while improving the performance of an EAHE.…”

Section: Eahe Studies Reviewmentioning

confidence: 99%

Earth to Air Heat Exchanger and Its Applications in Arid Regions - An Updated Review

Sakhri¹,

Menni²,

Chamkha³

et al. 2020

IJES

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Earth to Air Heat Exchanger ETAHE or Air Ground Heat Exchanger (AGHE) is a renewable technique based on geothermal source used for many centuries in arid and desert regions and considered as a principal element of vernacular and traditional architecture. Arid regions are characterized by a severe winter and summer weather conditions leads to a large thermal discomfort for the big part of the year. Many researchers studied the potentials of this technique to ensure thermal comfort inside buildings for summer and winter seasons. The present study is a review of numerical, experimental, parametric and economic studies of an earth to air heat exchanger with a focus on its application in semi-arid and arid regions. Using an air-to-ground heat exchanger for thermal comfort requires a deep understanding of geothermal deposits and these natural potentials and particularly in desert and arid regions.

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“…(2), as well as the heat convection of air flow in roadway shall satisfy three laws of thermodynamics, namely, the law of mass conservation, the law of momentum conservation, and the law of energy conservation; flow and heat transfer in the airflow are controlled by Eqs. (3), (4), (5) (Brum et al 2019). As for the turbulence model of airflow, the RNG k−E model was employed in this study for its clear advantage in predicting near-wall flow and low Reynolds number flows and excellent performance in both accuracy and efficiency (Liu et al 2016).…”

Section: Model Of Heat Transfer Between Airflow and Rock In Minementioning

confidence: 99%

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Guo

Pang

et al. 2020

Arab J Geosci

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Not only is the thermal environment of the coal mining face related to the temperature of the surrounding rock, it is also closely associated with the ventilation model of the working face. In this study, the numerical methods were applied to study the impact of two major ventilation systems on the airflow temperature of working face in coalmine. Firstly, a heat transfer model of the surrounding rock and airflow was established to reveal that the wall roughness of the surrounding rock could enhance heat transfer between the surrounding rock and the airflow. Moreover, an analysis was conducted of the heat transfer between the airflow and the surrounding rock under different modes of ventilation in the first mining face. According to the analytical results, the temperature of airflow in the U-type ventilation system is lower than in the Y-type ventilation system. For the next adjacent coal mining face, however, the Y-type ventilation system is more conducive in reducing the temperature of the airflow. Therefore, with regard to the mine as a whole, the Y-type ventilation system is more effective than a U-type system in reducing heat and humidity in the ambient environment.

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Design evaluation of Earth-Air Heat Exchangers with multiple ducts

Cited by 50 publications

References 34 publications

Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load

Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load

Earth to Air Heat Exchanger and Its Applications in Arid Regions - An Updated Review

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

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