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

2005 ◽  
Vol 128 (1) ◽  
pp. 69-76 ◽  
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%.

Enhancement of latent heat storage in a rectangular cavity: Solar water heater case study

2014 ◽  
Vol 78 ◽  
pp. 904-912 ◽  
Author(s):  
Salwa Bouadila ◽  
Mehdi Fteïti ◽  
Mohamed Mehdi Oueslati ◽  
Amenallah Guizani ◽  
Abdelhamid Farhat
Keyword(s):  
Latent Heat ◽  
Heat Storage ◽  
Rectangular Cavity ◽  
Solar Water Heater ◽  
Water Heater ◽  
Latent Heat Storage ◽  
Solar Water

Effect of Circular Fins on Latent Heat Storage to Enhance Solar Water Heater, an Experimental Study

2015 ◽  
Vol 787 ◽  
pp. 13-17 ◽  
Author(s):  
G. Murali ◽  
K. Mayilsamy
Keyword(s):  
Energy Efficiency ◽  
Energy Storage ◽  
Storage Tank ◽  
Water Tank ◽  
Solar Water Heater ◽  
Water Heater ◽  
Latent Heat Storage ◽  
Solar Water ◽  
Collector Efficiency ◽  
Charging Energy

In natural circulation solar water heating, the efficiency of energy storage and solar collector can be improved if the water tank is stratified. Employing Phase Change Material (PCM) in the top of the tank will improve the stratification of the energy storage tank. Current paper studies the use of circular fins around PCM geometry with high surface to volume ratio to improve the efficiency of solar water heater. Heating and cooling tests have been performed in a domestic water heater with flat plate collector under real working conditions. Eventually the temperature distribution along the height of the storage tank, charging energy efficiency, collector efficiency have been calculated and compared. Tests have been simulated in CFD software for validating results. Addition of circular fins around PCM produces up to 5% and 36.48% improvement in tank charging energy efficiency, collector efficiency respectively because of improved heat transfer between PCM and water.

scholarly journals Effect of Twisted Fin Array in a Triple-Tube Latent Heat Storage System during the Charging Mode

2021 ◽  
Vol 13 (5) ◽  
pp. 2685
Author(s):  
Mohammad Ghalambaz ◽  
Jasim M. Mahdi ◽  
Amirhossein Shafaghat ◽  
Amir Hossein Eisapour ◽  
Obai Younis ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Exchanger ◽  
Latent Heat ◽  
Thermal Energy ◽  
Heat Storage ◽  
Hot Water ◽  
Melting Time ◽  
Latent Heat Storage ◽  
Tube Heat Exchanger ◽  
Storage Rate

This study aims to assess the effect of adding twisted fins in a triple-tube heat exchanger used for latent heat storage compared with using straight fins and no fins. In the proposed heat exchanger, phase change material (PCM) is placed between the middle annulus while hot water is passed in the inner tube and outer annulus in a counter-current direction, as a superior method to melt the PCM and store the thermal energy. The behavior of the system was assessed regarding the liquid fraction and temperature distributions as well as charging time and energy storage rate. The results indicate the advantages of adding twisted fins compared with those of using straight fins. The effect of several twisted fins was also studied to discover its effectiveness on the melting rate. The results demonstrate that deployment of four twisted fins reduced the melting time by 18% compared with using the same number of straight fins, and 25% compared with the no-fins case considering a similar PCM mass. Moreover, the melting time for the case of using four straight fins was 8.3% lower than that compared with the no-fins case. By raising the fins’ number from two to four and six, the heat storage rate rose 14.2% and 25.4%, respectively. This study presents the effects of novel configurations of fins in PCM-based thermal energy storage to deliver innovative products toward commercialization, which can be manufactured with additive manufacturing.

A novel liquid air energy storage system using a combination of sensible and latent heat storage

2021 ◽  
pp. 117890
Author(s):  
Ju-Yeol Ryu ◽  
Adrian Alford ◽  
Graham Lewis ◽  
Yulong Ding ◽  
Yunren Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Latent Heat Storage
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