PERFORMANCE ENHANCEMENT OF TWO PHASE THERMOSYPHON SOLAR WATER HEATER USING SURFACTANT

Entropy generated by operation of a two-phase self-pumping solar water heater under Solar Rating and Certification Corporation rating conditions is computed numerically in a methodology based on an exergy cascade. An order of magnitude analysis shows that entropy generation is dominated by heat transfer across temperature differences. Conversion of radiant solar energy incident on the collector to thermal energy within the collector accounts for 87.1 percent of total entropy generation. Thermal losses are responsible for 9.9 percent of total entropy generation, and heat transfer across the condenser accounts for 2.4 percent of the total entropy generation. Mixing in the tempering valve is responsible for 0.7 percent of the total entropy generation. Approximately one half of the entropy generated by thermal losses is attributable to the self-pumping process. The procedure to determine total entropy generation can be used in a parametric study to evaluate the performance of two-phase hot water heating systems relative to other solar water heating options.

Download Full-text

Performance Enhancement of Solar Water Heater Incorporated with Latent Heat Storage Material

Advances in Design and Thermal Systems - Lecture Notes in Mechanical Engineering ◽

10.1007/978-981-33-6428-8_36 ◽

2021 ◽

pp. 441-454

Author(s):

M. Ajees Aboobucker ◽

N. Muthu Saravanan ◽

R. Mayilraj Sathish ◽

S. Aakhash ◽

M. Gunasekaran

Keyword(s):

Latent Heat ◽

Heat Storage ◽

Performance Enhancement ◽

Solar Water Heater ◽

Storage Material ◽

Water Heater ◽

Latent Heat Storage ◽

Solar Water ◽

Heat Storage Material

Download Full-text

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

Journal of Solar Energy Engineering ◽

10.1115/1.2147588 ◽

2005 ◽

Vol 128 (1) ◽

pp. 69-76 ◽

Cited By ~ 32

Author(s):

Wen-Shing Lee ◽

Bo-Ren Chen ◽

Sih-Li Chen

Keyword(s):

Energy Storage ◽

Latent Heat ◽

Heat Storage ◽

Solar Water Heater ◽

Water Heater ◽

Two Phase ◽

Latent Heat Storage ◽

Solar Water ◽

Energy Storage Material ◽

Optimum Charge

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 (NaCH3COO∙3H2O) 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%.

Download Full-text