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Research Papers

Investigation of the Thermal Performances of Flat, Finned, and v-Corrugated Plate Solar Air Heaters

[+] Author and Article Information
A. E. Kabeel

Mechanical Power Engineering Department,
Faculty of Engineering,
Tanta University,
Tanta 31111, Egypt
e-mail: kabeel6@hotmail.com

A. Khalil

Mechanical Power Engineering Department,
Faculty of Engineering,
Tanta University,
Tanta 31111, Egypt
e-mail: akhalileg@yahoo.com

S. M. Shalaby

Physics and Mathematics Department,
Faculty of Engineering,
Tanta University,
Tanta 31111, Egypt
e-mail: Saleh_shalaby@yahoo.com

M. E. Zayed

Mechanical Power Engineering Department,
Faculty of Engineering,
Tanta University,
Tanta 31111, Egypt
e-mail: Zayed_handasa2001@yahoo.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 15, 2015; final manuscript received May 1, 2016; published online July 19, 2016. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 138(5), 051004 (Jul 19, 2016) (7 pages) Paper No: SOL-15-1303; doi: 10.1115/1.4034027 History: Received September 15, 2015; Revised May 01, 2016

In this research, the thermal performances of flat, finned, and v-corrugated plate solar air heaters were investigated experimentally. A solar air heater with single glass cover, single pass was designed and tested under prevailing weather conditions of Tanta city (30°43′ N, 31° E), Egypt. The solar air heater was designed to be easy to replace the absorber plate from one to another one. Comparisons between the temperature difference of air across the heater and thermal efficiencies of the flat, finned, and v-corrugated plate solar air heaters were presented. The effect of change in the mass flow rate of air on the outlet air temperature and the thermal efficiency of the heater were also studied when the mass flow rates were 0.062, 0.028, and 0.009 kg/s. The experimental results showed that the maximum value of outlet temperature of the v-corrugated plate solar air heater was 5 and 3.5 °C more than that of flat and finned plates when the mass flow rate was 0.062 kg/s, respectively. And, it increased to be 8 and 5.5 C when the mass flow rate was 0.009 kg/s. It is also indicated that the thermal efficiency of the v-corrugated solar air heater is 8–14.5% and 6–10.5% higher than that of the flat and finned plate heaters, respectively, when the mass flow rate was 0.062 kg/s under the considered configurations and operating conditions. The experimental results also indicated that the convective heat transfer coefficient of the v-corrugated heater reached up to 1.64 and 1.36 times than that of the flat and finned heaters, respectively, when the flow rate was 0.062 kg/s.

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Figures

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Fig. 1

(a) A schematic diagram of solar air heater system and (b) the photograph for the solar air heater system

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Fig. 2

Cross section of v-corrugated absorber plate

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Fig. 3

Variation of solar radiation intensity and ambient temperature variation on Aug. 15, 2015

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Fig. 4

Measured temperatures of the different elements of the flat plate solar air heater, versus time on Aug. 15, 2015 when m˙= 0.062 kg/s

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Fig. 5

Measured temperatures of the different elements of the finned plate solar air heater, versus time Aug. 20, 2015 when m˙= 0.062 kg/s

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Fig. 6

Measured temperatures of the different elements of the v-corrugated plate solar air heater versus time Aug. 25, 2015 when m˙= 0.062 kg/s

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Fig. 7

A comparison of the measured temperature difference of air between v-corrugated, finned, and flat plate solar air heater at m˙= 0.062 kg/s

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Fig. 8

A comparison of instantaneous thermal efficiency between v-corrugated, finned, and flat plate solar air heater at m˙= 0.062 kg/s

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Fig. 9

A comparison of the measured temperature difference of air between v-corrugated, finned and flat plate solar air heater at m˙= 0.028 kg/s

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Fig. 10

A comparison of instantaneous thermal efficiency between v-corrugated, finned, and flat plate solar air heater at m˙= 0.028 kg/s

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Fig. 11

A comparison of the measured temperature difference of air between v-corrugated, finned, and flat plate solar air heater at m˙= 0.009 kg/s

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Fig. 12

A comparison of instantaneous thermal efficiency between v-corrugated, finned, and flat plate solar air heater at m˙= 0.028 kg/s

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Fig. 13

A comparison of daily efficiency between the v-corrugated, finned, and flat plate solar air heater versus the mass flow rate

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Fig. 14

Efficiency curves of v-corrugated heater at various flow rates

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Fig. 15

Efficiency curves of finned heater at various flow rates

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Fig. 16

Efficiency curves of flat heater at various flow rates

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Fig. 17

The convective heat transfer coefficient of air among v-corrugated, finned, and flat plate solar air heater via time at m˙= 0.062 kg/s

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Fig. 18

The convective heat transfer coefficient of air among v-corrugated, finned, and flat plate solar air heater via time at m˙= 0.028 kg/s

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Fig. 19

The convective heat transfer coefficient of air among v-corrugated, finned, and flat plate solar air heater via time at m˙= 0.009 kg/s

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