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Research Papers

Latent Heat Storage in a Two-Phase Thermosyphon Solar Water Heater

[+] Author and Article Information
Wen-Shing Lee

 National Taipei University of Technology, Department of Air-Conditioning and Refrigeration Engineering, 10673, Taipei, Taiwan, R.O.C.

Bo-Ren Chen

 National Taiwan University, Department of Mechanical Engineering, 10673, Taipei, Taiwan, R.O.C.

Sih-Li Chen1

 National Taiwan University, Department of Mechanical Engineering, 10673, Taipei, Taiwan, R.O.C.

1

Corresponding author.

J. Sol. Energy Eng 128(1), 69-76 (Jan 25, 2005) (8 pages) doi:10.1115/1.2147588 History: Received April 28, 2004; Revised January 25, 2005

This article experimentally studies the thermal performance of latent heat storage in a two-phase thermosyphon solar water heater, which utilizes the superior heat transfer characteristics of boiling and condensation, and eliminates drawbacks found in the conventional solar water heater. Experimental investigations are first conducted to study the thermal behavior of tricosane (paraffin wax 116), water, and sodium acetate (NaCH3COO3H2O) used as energy storage materials. The results indicate that tricosane provides many advantages to be the energy storage material in the latent heat storage system. This study also examines the functions of charge and discharge thermal behaviors in a two-phase thermosyphon solar water heater. The results show that the system gives optimum charge and discharge performance under 40% alcohol fill ratio and with tricosane used as the energy storage material, and displays an optimum charge efficiency of 73% and optimum discharge efficiency of 81%.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Thermal storage in two-phase thermosyphon solar water heater (a) charge mode, (b) discharge mode

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Figure 2

Schematic of measuring apparatus used in the ESM experiments

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Figure 3

Temperature variations of each ESM during the heat storage process

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Figure 4

Temperature variations of each ESM during the heat release process

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Figure 5

Diagram of the two-phase thermosyphon solar water heater, (1) collector, (2) double pipe heat exchanger, (3) fin tubes, (4) lower headers, (5) energy storage tank

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Figure 6

Schematic of measuring apparatus used in the experiment

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Figure 7

Temperature distributions of (a) tricosane, (b) water, and (c) sodium acetate, during the heat charge process

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Figure 8

Temperature distributions of (a) tricosane, (b) water, and (c) sodium acetate, during the heat discharge process

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Figure 9

Comparison of charge efficiencies under different fill ratios

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Figure 10

Comparison of discharge efficiencies under different fill ratios

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