New approach relevant to total heat transfer coefficient including the effect of radiation and convection at the ceiling in a cooled ceiling room

Karadağ, Refet

doi:10.1016/j.applthermaleng.2008.07.005

Cited by 42 publications

(29 citation statements)

References 17 publications

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“…The most significant studies that investigate this issue in real-size rooms were conducted experimentally by Le Dreau et al [24] and numerically by Karadag [25]. The details of these studies can be summarized as follows:…”

Section: Nomenclaturementioning

confidence: 99%

“…Furthermore, Karadag [25] has proposed air temperature as the reference temperature for the total heat transfer coefficient. He predicated his proposal on the state that there is not any heater or cooler in the room and the temperature difference between the studied surface and the room air is capable of encompassing the influence of convective heat transfer and also the reciprocal radiative heat transfer action between the examined surface and the other surfaces.…”

Section: Theoretical Model and Determination Of Reference Temperaturesmentioning

confidence: 99%

“…This approach employs a local gravitational force all over the flow pattern that is a function of thermal expansion coefficient (ˇ) and the local temperature difference [32]. Among many viscous models presented by the program, as suggested by Karadag [25], Chae and Strand [32] and Corgnati et al [33] who executed the standard k-ε model as the turbulence solution model into flow pattern in rooms cooled with radiant systems, and Karadag and Teke [34] who employed the standard k-ε model in a room heated by its floor, we also chose the standard k-ε model. Also, it should here be stated that the standard wall functions were used under this model.…”

Section: Cfd Modelmentioning

confidence: 99%

“…In this study, we have applied Karadag's [25] practical approach toward the total heat transfer coefficient.…”

Section: Theoretical Model and Determination Of Reference Temperaturesmentioning

confidence: 99%

“…Karadag [25] analyzed the radiative, convective and also total heat transfer coefficient in an enclosure cooled from its ceiling, with both theoretical and numerical methods. He found the radiative heat transfer at different surface emissivities, room dimensions and thermal boundary conditions.…”

Section: Nomenclaturementioning

confidence: 99%

See 4 more Smart Citations

A novel evaluation regarding the influence of surface emissivity on radiative and total heat transfer coefficients in radiant heating systems by means of theoretical and numerical methods

Açıkgöz

2015

Energy and Buildings

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Section: Nomenclaturementioning

confidence: 99%

Section: Theoretical Model and Determination Of Reference Temperaturesmentioning

confidence: 99%

Section: Cfd Modelmentioning

confidence: 99%

“…In this study, we have applied Karadag's [25] practical approach toward the total heat transfer coefficient.…”

Section: Theoretical Model and Determination Of Reference Temperaturesmentioning

confidence: 99%

Section: Nomenclaturementioning

confidence: 99%

See 3 more Smart Citations

A novel evaluation regarding the influence of surface emissivity on radiative and total heat transfer coefficients in radiant heating systems by means of theoretical and numerical methods

Açıkgöz

2015

Energy and Buildings

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Radiative cooling: Experimental and numerical analysis for enhanced thermal management strategies in engineering systems

Güler

2024

Heat Trans

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This study aims to fully evaluate the radiation effect in existing cooling systems. The research, a combination of experimental analysis and numerical simulations using ANSYS Fluent, examines the complexity of radiative cooling processes and their impact on thermal management in various engineering applications. The experiments began by carefully placing a 112.5 W heater into the thermal channel. Next, temperature measurements were made under various conditions. In particular, the use of black cotton fabric as the inner duct lining applied in the thermal channel stands out as an innovation that aims to optimize heat absorption by increasing radiative properties. The findings highlight the significant impact of radiation on cooling performance. A temperature drop of 2–3°C was observed in cooling under the effect of radiation. Additionally, numerical simulations reveal the feasibility of radiative cooling systems by providing valuable information about the flow dynamics and heat transfer mechanisms within the channel. The novelty of this work is its detailed examination of radiative cooling effects and its focus on its potential to optimize thermal management strategies in various engineering applications. Explaining the role of radiation in heat transfer and providing practical information to improve cooling efficiency demonstrates that this research brings important insight and lays the foundation for future advances in the field. Considering the urgent need for energy‐efficient cooling solutions and the increasing demand for sustainable engineering practices, the findings of this study will provide important insights for researchers and practitioners. This study provides innovative perspectives and solutions to address the increasing challenges of heat transfer and energy conservation in engineering systems. It makes a significant contribution to the field of thermal management by offering methodologies.

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Experimental and Theoretical Study on the Thermal Environment Based on Simultaneously Model in a Room

Huang

Chen

et al. 2013

Lecture Notes in Electrical Engineering

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New approach relevant to total heat transfer coefficient including the effect of radiation and convection at the ceiling in a cooled ceiling room

Cited by 42 publications

References 17 publications

A novel evaluation regarding the influence of surface emissivity on radiative and total heat transfer coefficients in radiant heating systems by means of theoretical and numerical methods

A novel evaluation regarding the influence of surface emissivity on radiative and total heat transfer coefficients in radiant heating systems by means of theoretical and numerical methods

Radiative cooling: Experimental and numerical analysis for enhanced thermal management strategies in engineering systems

Experimental and Theoretical Study on the Thermal Environment Based on Simultaneously Model in a Room

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