Research Papers

Parametric Study of a Flat Plate Wick Assisted Heat Pipe Solar Collector

[+] Author and Article Information
Brahim Taoufik

e-mail: taoufik.brahim@yahoo.fr

Jemni Abdelmajid

e-mail: enim_leste@yahoo.fr
Laboratoire d'Etudes des Systèmes
Thermique et Energétique (LESTE),
Ecole Nationale d'Ingénieurs de Monastir,
Université de Monastir,
Avenue Ibn Jazzar 5019 Monastir, Tunisia

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received December 15, 2011; final manuscript received November 21, 2012; published online May 31, 2013. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 135(3), 031016 (May 31, 2013) (10 pages) Paper No: SOL-11-1286; doi: 10.1115/1.4023875 History: Received December 15, 2011; Revised November 21, 2012

The use of heat pipes in solar collectors offers several advantages regarding flexibility in operation and application, as they are very efficient in transporting heat even under a small temperature difference. Compared with other systems powered by evacuated tube collectors or flat plate solar collectors using a wickless heat pipe, little attention has been paid to a flat plate solar collectors wick assisted heat pipe. In this paper an analytical model based on energy balance equations assuming a steady state condition was developed to evaluate the thermal efficiency of a flat plate wick assisted heat pipe solar collector. Parameters which affect the collector efficiency are identified, such as tube spacing distance, gap spacing between the absorber plate and the glazing cover, and the emissivity of the absorber plate. The results reflect the contribution and significance of each of these parameters to the collector overall heat loss coefficients. Three heat pipe working fluids are examined and results show that acetone performs better than methanol and ethanol.

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Fig. 1

Heat pipe solar collector

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Fig. 2

Evaporator cross section (enlarged)

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Fig. 3

Heat pipe thermal resistances [20]

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Fig. 4

Mean fin plate temperature and water outlet temperature compared with experimental data

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Fig. 5

Fin plate temperature distribution example

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Fig. 6

The effect of tube spacing distance on the performance of the collector

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Fig. 7

The effect of tube spacing distance on the performance of the collector for three absorber plate thermal conductivities

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Fig. 8

The effect of the number of H.P on collector efficiency

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Fig. 9

The effect of plate emissivity on the performance of the collector

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Fig. 10

The effect of plate emissivity on heat loss coefficients and glass cover temperature

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Fig. 11

The effect of plate-cover distance on the performance of the collector

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Fig. 12

The effects of plate-cover distance on overall heat loss and heat loss coefficients

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Fig. 13

The optimum value of Le/Lc

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Fig. 14

Collector efficiency curve for different working fluid

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Fig. 15

Collector efficiency curve compared with earlier works




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