Experimental study of laminar flow forced-convection heat transfer in air flowing through offset plates heated by radiation heat flux

Ali, Ahmed Hamza H.; Kishinami, Koki; Hanaoka, Yutaka; Suzuki, Jun

doi:10.1016/s0735-1933(98)00017-7

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…The higher temperature of the absorber plate increases the near wall air and storage material temperatures. This matches the findings presented in [19]. Figure 7 is a sample figure illustrating spatial variation of Nusselt number for different values of solar radiation.…”

Section: Resultssupporting

confidence: 87%

“…This increase in air viscosity affects the wall shear stress and decreases the local Re as well which causes an increase in thermal boundary layer thickness, and results in decreasing the convective heat transfer coefficient. This matches the findings presented in [19]. Figure 8 illustrates the variation of average outlet air temperature, absorber plate and storage material temperatures at outlet section and air heater efficiency with air mass flow rate.…”

Section: Resultssupporting

confidence: 86%

“…Figure 7 is a sample figure illustrating spatial variation of Nusselt number for different values of solar radiation. As it was indicated in [19] that Nusselt number decreases along the air heater. It may be remarked from fig.…”

Section: Resultsmentioning

confidence: 85%

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An experimental investigation of forced convection flat plate solar air heater with storage material

Aissa¹,

El-Sallak²,

Elhakem³

2012

THERM SCI

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Solar air heater (SAH) is a heating device that uses the heated air in the drying of agriculture products and many engineering applications. The purpose of the present work is to study a forced convection flat plate solar air heater with granite stone storage material bed under the climatic conditions of Egypt-Aswan. Experiments are performed at different air mass flow rates ; varying from 0.016 kg/s to 0.08 kg/s, for five hot summer days of July 2008. Hourly values of global solar radiation and some meteorological data (temperature, pressure, relative humidities, etc.) for measuring days are obtained from the Egyptian Meteorological Authority, Aswan station. Inlet and outlet temperatures of air from a SAH have been recorded. In this work, attempt has been made to present the temperature distribution in non dimensional form that makes it useable for any region and not restricted to local conditions. The variation of solar radiation, air heater efficiency, Nusselt number and temperature distribution along the air heater are discussed. Comparisons between the calculated values of outlet air temperatures, average air temperatures and storage material temperatures and the corresponding measured values showed good agreement. Comparison between current work and those in previous investigations showed fair agreement

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 86%

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An experimental investigation of forced convection flat plate solar air heater with storage material

Aissa¹,

El-Sallak²,

Elhakem³

2012

THERM SCI

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“…The radiative properties used in calculations of the radiation part of the model were measured values, their measuring technique was described in Ali et al (1998). The average measured values of the absorptance and reflectance, for offset plates and the back plate samples, those coated black paint with coating thickness of about 60 µm, in the wavelength ranged from 0.3 to 17 µm were about 0.94 and 0.06 respectively, while the glass covers plates (g1) and (g2) are ordinary float colorless sheets of 3mm thickness, and having an average normal transmittance, reflectance and absorptance in the spectrum range of 0.3 to 3.0 µm are 0.855, 0.05 and 0.095 respectively.…”

Section: Numerical Methods Of Solutionmentioning

confidence: 99%

Numerical study on laminar flow forced‐convection heat transfer for air in a channel with offset plates heated by radiation heat flux

Ali

Kishinami

Hanaoka

et al. 1998

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…One of the arrangements to utilize the leading edge effect and to prevent a fully developed flow, to enhance the convective heat transfer process, is by placing the segments inside a channel to form an in-line configuration as reported by Ali [1], while in form of oblique plates to flow is reported in Ali el al [2]. Also, offset configuration was used as presented by Ali [3], and Ali et al [4]. For such in-line, oblique and offset configurations, the edge effect improves the heat transfer rate from both the upper and lower surfaces of the plate segments in a positive way but its not yet clarified which of these three configurations provide the highest heat transfer rate at minimum friction factor (pumping power) when the flow in the channel is laminar flow.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic Module Thermal Regulation: Effect of the Cells Arrangement Configurations on the Performance

Ali¹,

Matsushita²

2010

IJTEE

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This study is carried out to clarify experimentally the effect of higher PV module temperature on the module output power when the module works with and without thermal regulation system. Moreover theoretical study results are used to clarify which of the three configurations, in-line, oblique and offset of the cell location inside the channel, provide higher heat transfer rate at minimum friction factor. The results clearly indicate that, form the outdoor experimental measurements on PV module, the cell temperature is the prevailing parameter affecting the module output power more than the solar irradiance. While, based on the minimum friction factor for each configuration, the In-line plate segments configuration at certain design conditions provide the minimum friction factor, consequently, the minimum required pumping power, that will followed by higher PV module performance. Moreover, using PV modules in hot arid areas without thermal regulation leads to an increase in the total module areas ranging from 2.12 to 1.8 times that of module using thermal regulation system producing the same power.

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Experimental study of laminar flow forced-convection heat transfer in air flowing through offset plates heated by radiation heat flux

Cited by 7 publications

References 8 publications

An experimental investigation of forced convection flat plate solar air heater with storage material

An experimental investigation of forced convection flat plate solar air heater with storage material

Numerical study on laminar flow forced‐convection heat transfer for air in a channel with offset plates heated by radiation heat flux

Photovoltaic Module Thermal Regulation: Effect of the Cells Arrangement Configurations on the Performance

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