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 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%.

Effect of the Water Storage Tank Coverage With an Outer Glass Tube on the Thermal Performance of an Integrated Collector Storage Solar Water Heater

2014 ◽  
Vol 137 (1) ◽  
Author(s):  
Monia Chaabane ◽  
Hatem Mhiri ◽  
Philippe Bournot
Keyword(s):  
Thermal Performance ◽  
Storage Tank ◽  
Glass Tube ◽  
Water Tank ◽  
Solar Water Heater ◽  
Water Heater ◽  
Water Storage Tank ◽  
Solar Water ◽  
Thermal Output ◽  
New Strategy

The thermal performance of an integrated collector storage solar water heater (ICSSWH) is numerically examined using the numerical software Fluent 6.3. As this solar system presents the disadvantage of its high night thermal losses, a new strategy helping to reduce these losses is proposed. A particular system in which the storage tank is covered with an outer glass tube is studied and a parametric study is conducted in order to evaluate the optimal air spacing gap between the water tank and the covering glass tube which minimizes this system's heat losses. A 3D computational fluid dynamics (CFD) model interpreting this modified system is so developed and its thermal performance is compared to that of the noncovered tank based ICSSWH. The analysis of these solar systems daily performance shows that the modified ICSSWH is able to generate more thermal output and presents the advantage of its lower thermal losses. Regarding the night operating, this covered tank based ICSSWH is shown more effective in retaining higher temperatures for longer period, resulting so in lower night thermal losses. Results also suggest that the best performance corresponds to the lowest air gap spacing (L = 0.005 m).

scholarly journals TO STUDY AND ANALYSIS OF SOLAR WATER HEATER USING VARIOUS MASS FLOW RATE

2020 ◽  
Vol 5 (3) ◽  
pp. 139-144
Author(s):  
Sunaina Sailani
Keyword(s):  
Solar Radiation ◽  
Mass Flow Rate ◽  
Flow Rate ◽  
Storage Tank ◽  
The Body ◽  
Solar Water Heater ◽  
Water Heater ◽  
Water Pipes ◽  
Solar Water ◽  
Circulating Water

Solar water heater is a device which is used for heating the water using of sun energy. This system is connected like as storage tank, centrifugal pump, pipes and glass. The circulating flexible water pipes are connected with the metallic pipe, which are assembled with the body. The solar radiation are achieving from sun and passing although glass and collector for the purpose of the heating the circulating water. In this way we are achieving the various temperatures using of circulating pump.

Numerical Investigation of Thermal Separators Within the Evacuated Tubes of a Water-in-Glass Solar Water Heater

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Asif Soopee ◽  
Abdel Anwar Hossen Khoodaruth ◽  
Anshu Prakash Murdan ◽  
Vishwamitra Oree
Keyword(s):  
Tilt Angle ◽  
Thermal Efficiency ◽  
Thermal Stratification ◽  
Maximum Deviation ◽  
Water Tank ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Thermal Distribution ◽  
Evacuated Tubes

The effects of thermal separators within the evacuated tubes of a water-in-glass solar water heater (SWH) were numerically investigated using the commercial computational fluid dynamics (CFD) software ANSYS fluent. To validate the three-dimensional (3D) model, an experiment was performed for the passive operation of the SWH for a fortnight period, of which 3 h of recorded data was selected. The Boussinesq's approximation was employed, and the respective solar irradiance and ambient temperature profiles were incorporated. A maximum deviation of only 2.06% was observed between the experimental and numerical results. The model was then adapted for the case where thermal separators are inserted within the evacuated tubes of the SWH and both cases were run for two tilt angles, 10 deg and 40 deg. The temperature and velocity profiles within the evacuated tubes were analyzed alongside the temperature contours, thermal stratification, and overall thermal efficiency of the SWH. At a 40 deg tilt, without thermal separators, the flow streams within the evacuated tubes are restrained, and a chaotic thermal behavior was observed, thereby restricting thermal distribution to the water stored in the SWH tank. A lower tilt angle (10 deg) provided a more desirable thermal distribution. With thermal separators, however, the tilt angle preference was reversed. A faster and more uniform thermal distribution was achieved within the water tank, with a sizeable reduction in the thermal stratification at a 40 deg tilt. The overall thermal efficiency of the SWH was improved by 4.11% and 4.14% for tilt angles of 10 deg and 40 deg, respectively.

The Device of the Automatic Backflow in Solar Water Heater-Temperature Control and Backflow for Pipe of Water Heater

2013 ◽  
Vol 827 ◽  
pp. 99-104
Author(s):  
Bin Li ◽  
Xi Chen ◽  
Xin Hao Li ◽  
Lu Kuan Ma ◽  
Wen Bo Lu ◽  
...  
Keyword(s):  
Water Resources ◽  
Cold Water ◽  
Hot Water ◽  
Water Tank ◽  
Solar Water Heater ◽  
Recycle Water ◽  
Delay Effect ◽  
Water Heater ◽  
Domestic Water ◽  
Solar Water

Now in general use in solar water heater, there is a long pipeline between water heater and tap, we have to empty the stored cold water before we use the hot water; and usually the water cannot meet required temperature due to the heating delay effect, thus the water also should be emptied, which leads to a waste of water resources. In order to solve this water wastage, we propose a device which can help to control the temperature and backflow of the water in water heater. The device accomplishes backflow of cold water automatically under the effect of gravity, and refluxed water will be stored in the recycle-water tank, thus ensuring the result that the water temperature satisfies the requirement. After the recycle-water tank is full, it will trigger the buoy to control the relay switch, then the water pump start to work to force the water into the water heater tank. Thus, realizing the recycling of water. This device can significantly save water resources in domestic water, and it has a broad market prospect.

Analysis of the performance profile of the NCERD thermosyphon solar water heater

2011 ◽  
Vol 22 (2) ◽  
pp. 22-26 ◽  
Author(s):  
Solomon Agbo
Keyword(s):  
Test System ◽  
Solar Water Heater ◽  
Plate Material ◽  
Absorber Plate ◽  
Water Heater ◽  
Solar Water ◽  
System Temperature ◽  
Collector Efficiency ◽  
Cover Thickness ◽  
Performance Results

The work reported here is the performance profile of a thermosyphon solar water heater developed by the National Centre for Energy Research and Development (NCERD), University of Nigeria, Nsukka. The performance evaluation was based on the mathematical models that describe the test system and some measured experimental data. The effect of some of the design and operating parameters that have been shown to affect the system’s performance was investigated. The parameters considered included the number of glazing covers, glazing cover thickness, tube spacing and the nature of absorber plate material. The performance results indicate that the test system has a maximum average daily collector efficiency of 0.658 and a mean system temperature of 81oC. The efficiency of the collector drops to an average seasonal value of 0.54 with a negligible variation across the three climatic seasons was covered in the study. With a tube spacing not exceeding 10 cm, the performance of the system is optimized irrespective of the nature of the absorber plate material. We found that the number of glazing covers affects the top-loss coefficient of the system depending on the type of absorber plate used. Multiple glazing shows a negligible contribution especially for low temperature application. The glazing cover thickness does not affect the performance of the system significantly.

scholarly journals Experimental and Modeling Dynamic Study of the Indirect Solar Water Heater: Application to Rabat Morocco

2018 ◽  
Vol 7 (1) ◽  
pp. 86
Author(s):  
Ouhammou Badr ◽  
Azeddine Frimane ◽  
Aggour Mohammed ◽  
Brahim Daouchi ◽  
Abdellah Bah ◽  
...  
Keyword(s):  
Storage Tank ◽  
Weather Conditions ◽  
Hot Water ◽  
Experimental Setup ◽  
Solar Water Heater ◽  
Water Heater ◽  
Forced Circulation ◽  
Solar Water ◽  
Experimental Values ◽  
Temperature Output

The Indirect Solar Water Heater System (SWHS) with Forced Circulation is modeled by proposing a theoretical dynamic multi-node model. The SWHS, which works with a 1,91 m<sup>2</sup> PFC and 300 L storage tank, and it is equipped with available forced circulation scale system fitted with an automated sub-system that controlled hot water, is what the experimental setup consisted of. The system, which 100% heated water by only using solar energy. The experimental weather conditions are measured every one minute. The experiments validation steps were performed for two periods, the first one concern the cloudy days in December, the second for the sunny days in May; the average deviations between the predicted and the experimental values is 2 %, 5 % for the water temperature output and for the useful energy  are 4 %, 9 % respectively for the both typical days, which is very satisfied. The thermal efficiency was determined experimentally and theoretically and shown to agree well with the EN12975 standard for the flow rate between 0,02 kg/s and 0,2kg/s.

scholarly journals Performance Analysis Of Solar Water Heating System With Plate Collector Integrated Pcm Storage

2021 ◽  
Vol 3 (2) ◽  
pp. 143-149
Author(s):  
Andi Syahrinaldy Syahruddin ◽  
Jalaluddin Jalaluddin ◽  
Azwar Hayat
Keyword(s):  
Solar Energy ◽  
Fluid Dynamic ◽  
Heating System ◽  
Solar Water Heater ◽  
Absorber Plate ◽  
Water Heater ◽  
Solar Water ◽  
Fluent Software ◽  
Collector Efficiency ◽  
Solar Water Heating System

Availability of solar energy as a renewable energy source is very abundant and inexhaustible. Solar water heater is an equipment that utilizes solar energy as a source of energy. The thermal performance of a solar water heater system using absorber plate with phase change material (PCM) as thermal energy storage is presented in this study. Two design of solar water heater collectors with absorber plate variations, i.e. an absorber plate with PCM storage and absorber plate without PCM storage were investigated experimentally and numerically simulation. First, the material properties of paraffin wax as PCM storage was analized analyticaly. Every shape model of solar water heater systems were imported and simulated at three variations of constant solar radiation, i.e. 400  W/m2, 700 W/m2, and 1000 W/m2. The simulation using a computational fluid dynamic (CFD) fluent software. The results showed that the average collector efficiency between absorber plate with and without PCM storage is 70.98 % using experimental study and 67.73 % using numerical simulation study.

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