CFD modeling of transpired solar collectors and characterisation of multi-scale airflow and heat transfer mechanisms

Tajdaran, Sadjad; Bonatesta, Fabrizio; Ogden, Ray; Kendrick, Christopher

doi:10.1016/j.solener.2016.02.042

Cited by 14 publications

(27 citation statements)

References 19 publications

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“…The estimation HED from October to March can be calculated based on a study by Tajdaran et al and ASHRAE Handbook by the following steps:

normalH normalE normalD = U . A_{w} . true(T_{i n d o o r} - T_{o u t d o o r} true),

normalH normalE D_{normalm normalo normaln normalt normalh normall normaly} = \sum H E D_{normalh normalo normalu normalr} \times normalN normalo normald normala normaly normals,

where A w is the walls surface area of the flat (m 2 ), U is the overall heat transfer coefficient of the flat wall (W/m 2 .K), T indoor − T outdoor are different temperatures between the inside and the outside air of the flat (°C) respectively, HED monthly is the average monthly data of HED, No days is the working days number during a month and ∑HED hour is the summation hourly data of HED.…”

Section: Thermal and Economic Characteristics Data Analysementioning

confidence: 99%

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The thermal and economic characteristics of solar air collectors with different delta turbulators arrangement

Obaid

Al‐damook

Khalil

2019

Heat Trans. Asian Res.

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The benefits of using a solar air collector with different array delta turbulators absorber plate are experimentally investigated to assess this type of collector under western and middle of Iraq climate conditions. The solar collector was investigated with four different absorber plate in which flat plate, in‐line delta turbulators, staggered delta turbulators and inclined staggered delta turbulators with different mass airflow rate. The economic characteristics and overall thermal performance of the collector are compared with other heating systems. The major findings show that the delta turbulators enhance the economic characteristics and the overall thermal performance of collectors due to vortex generation and damping the development of the thermal boundary layer in the direction of airflow. A substantial enhancement is observed in lowering both life‐cycle cost and increasing energy saving with delta turbulators. This study will likewise provide a new direction to the work trend in western and middle of Iraq climate conditions during winter days.

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“…The estimation HED from October to March can be calculated based on a study by Tajdaran et al and ASHRAE Handbook by the following steps:

normalH normalE normalD = U . A_{w} . true(T_{i n d o o r} - T_{o u t d o o r} true),

normalH normalE D_{normalm normalo normaln normalt normalh normall normaly} = \sum H E D_{normalh normalo normalu normalr} \times normalN normalo normald normala normaly normals,

Section: Thermal and Economic Characteristics Data Analysementioning

confidence: 99%

“…The monthly amount of thermal useful energy achievement from the collectors ( E ) can be estimated from 10th month to 3rd month based on the following equations of et al and ASHRAE Handbook:

q_{u} = Q_{u} A_{c},

E = \sum q_{u h r} \times normalN normalo normald normala normaly normals,

…”

Section: Thermal and Economic Characteristics Data Analysementioning

confidence: 99%

The thermal and economic characteristics of solar air collectors with different delta turbulators arrangement

Obaid

Al‐damook

Khalil

2019

Heat Trans. Asian Res.

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“…Wind condition including speed and direction affects TSC performance because wind flowing through the collector's surface decline useful thermal energy to heat the air by effectuating convection heat loss . Also, wind speed has a significant impact on HEE . Figure displays the impact of wind rate on the ideal (Hu/H) value in the top thermal efficiency and second law efficiency.…”

Section: The Parametric Dependency Of Tsc Performancementioning

confidence: 99%

“…In the UK, the building operation consumes roughly 39% of total energy of which nearly 50% of the energy is used for heating and ventilation . These energy usages have direct implications on greenhouse gas emissions (37% of greenhouse gas emissions comes from building sector) . CO 2 emissions resulting in global warming has become a demanding issue and needs to be addressed .…”

Section: Introductionmentioning

confidence: 99%

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A systematic review on parametric dependencies of transpired solar collector performance

et al. 2018

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Summary Zero or low‐carbon buildings can be achieved through novel technology solutions and integrating renewable energy into the buildings. One method of reducing the fossil fuel dependency of buildings and limiting greenhouse gas emissions is integrating the solar thermal system into the built environment. Recently, transpired solar collector has been identified as 1 of the most efficient solar thermal conversion technologies where a very high efficiency can be achieved. The proposed review paper investigates the performance of transpired solar collectors (TSCs) and discusses the relevant case studies in this context. This paper introduces the background and concept of TSCs. It mainly focuses on the study of parametric dependency of the performance of TSCs. The paper also investigates various mathematical models, experimental study, and numerical simulations particularly CFD used for TSC performance analysis. This proposed paper concluded that wind speed and airflow rate are the most dominant factor in TSC performance but solar irradiation, hole diameter, hole geometry, and pitch size have limited effect on TSC performance; also, profile with longer pitch tends to lower the collector efficiency and heat transfer coefficient. However, profile with shorter pitch tends to reduce the wind effect.

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Design and performance of multi-purpose vacuum solar collector

Balotaki

Saidi

2017

Heat Mass Transfer

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CFD modeling of transpired solar collectors and characterisation of multi-scale airflow and heat transfer mechanisms

Abstract: CFD modeling of transpired solar collectors and characterisation of multi-scale airflow and heat transfer mechanisms.

Cited by 14 publications

References 19 publications

The thermal and economic characteristics of solar air collectors with different delta turbulators arrangement

The thermal and economic characteristics of solar air collectors with different delta turbulators arrangement

A systematic review on parametric dependencies of transpired solar collector performance

Design and performance of multi-purpose vacuum solar collector

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