scholarly journals Effect of Fluid Flow Direction on Charging of Multitube Thermal Energy Storage for Flat Plate Solar Collectors

2021 ◽  
Vol 10 (2) ◽  
pp. 365-371
Author(s):  
Ramalingam Senthil
Keyword(s):  
Fluid Flow ◽  
Energy Storage ◽  
Flat Plate ◽  
Flow Rate ◽  
Solar Collector ◽  
Heat Storage ◽  
Flow Direction ◽  
Fluid Flow Rate ◽  
Latent Heat Storage ◽  
Flat Plate Solar Collector

Flat plate solar collector plays a significant role in domestic water heating due to the ease of operation and maintenance. Thermal energy storage with phase change materials is used to store heat energy. The thermal performance of paraffin wax-based multitube latent heat storage with a flat plate solar collector is investigated experimentally. The present work focuses on the fluid flow direction for charging and discharging in a vertical multitube-based thermal storage unit. The charging process took about four hours, with a fluid flow rate of 0.02 kg/s at about 70°C. The flat plate solar collector's thermal efficiency is 56.42% for the fluid flow rate of 0.02 kg/s at the average solar radiation of about 600 W/m2. During the discharge process, there was an increase in water temperature by 40°C at a fluid flow rate of 0.01 kg/s in 30 minutes. The 25-liters of water is circulated to discharge the stored heat. The heat storage effectiveness is varied between about 0.4 and 0.75. During the discharge, the flow of water from the center to the periphery showed about a 1.7% higher temperature than that of the water from the periphery to the center. For charging the heat storage, the preferred fluid flow mode is from the periphery to the center. The employment of latent heat storage with a solar collector is beneficial for our thermal needs after sunshine hours.

Performance evaluation of an open thermochemical energy storage system integrated with flat plate solar collector

2020 ◽  
Vol 173 ◽  
pp. 115218 ◽  
Author(s):  
Ankit Mukherjee ◽  
Rudrodip Majumdar ◽  
Sandip K. Saha ◽  
Chandramouli Subramaniam ◽  
Lalit Kumar
Keyword(s):  
Performance Evaluation ◽  
Energy Storage ◽  
Flat Plate ◽  
Solar Collector ◽  
Storage System ◽  
Energy Storage System ◽  
Flat Plate Solar Collector

scholarly journals Numerical study of flat plate solar collector performance with square shape wicked evaporator

2019 ◽  
Vol 12 (2) ◽  
pp. 90-97
Author(s):  
Basil Noori Merzah ◽  
Majid H. Majeed ◽  
Fouad A. Saleh
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Flow Rate ◽  
Solar Collector ◽  
Numerical Study ◽  
Charge Ratio ◽  
Working Fluid ◽  
Evaporator Section ◽  
Fill Charge Ratio ◽  
Flat Plate Solar Collector

In this work, a system of a heat pipe is implemented to improve the performance of flat plate solar collector. The model is represented by square shape portion of the evaporator section of wicked heat pipe with a constant total length of 510 mm, and the evaporator section inclined by an angle of 30o. In this models the evaporator, adiabatic and condenser lengths are 140mm, 140mm, and 230mm respectively. The omitted energies from sunlight simulator are 200, 400, 600, 800 and 1000 W/m2 which is close to the normal solar energy in Iraq. The working fluid for all models is water with fill charge ratio of 240%. The efficiency of the solar collector is investigated with three values of condenser inlet water temperatures, namely (12, 16 and 20o C). The numerical result showed an optimum volume flow rate of cooling water in condenser at which the efficiency of collector is a maximum. This optimum agree well with the ASHRAE standard volume of flow rate for conventional tasting for flat plate solar collector. When the radiation incident increases the thermal resistance of wicked heat pipe is decreases, where the heat transfer from the evaporator to condenser increases. The numerical results showed the performance of solar collector with square shape evaporator greater than other types of evaporator as a ratio 15 %.

scholarly journals Particle Optimization of Ceo2/Water Nanofluids in Flat Plate Solar Collector

2019 ◽  
Vol 9 (2) ◽  
pp. 1467-1474 ◽  
Keyword(s):  
Flat Plate ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Volume Concentration ◽  
Particle Volume ◽  
Wide Range ◽  
Flat Plate Solar Collector ◽  
Flat Plate Collector

The present research focuses on the role of CeO2/water nanofluid for estimating the performance of flat plate solar collector in respect of energetic and exergetic performance. Based on our experimental findings on varying mass flow rate, the present analysis focuses on a wide range of concentrations to find optimum volume concentration for which thermal performance is maximum. CeO2/water nanofluid exhibits high thermal conductivity improvement (~41.7%at 1.5% volume concentration) and comparatively lower dynamic viscosity. Performance evaluation of flat plate collector is based on first law analysis and qualitative nature of energy flow based on second law analysis. Experiments indicate that for~1.0% particle volume concentration at a mass flow rate of 0.03 kg/s, maximum collector efficiency is obtained up to 57.1% instead of water as the base fluid. Exergetic efficiency observed 84.6%at optimum concentration (~1.0% particle volume) of nanofluid at0.01 kg/s flow rate.

scholarly journals Optimization Of The Flow Distribution In VGroove Flat Plate Solar Collector using Cfd Simulation

2019 ◽  
Vol 8 (3) ◽  
pp. 4177-4182
Keyword(s):  
Flat Plate ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Solar Collector ◽  
Flow Distribution ◽  
Uniform Flow ◽  
Dynamics Simulation ◽  
Uniform Flow Distribution ◽  
Flat Plate Solar Collector

Flat plate solar collector is the major component of a solar heating system that converts solar radiation to thermal energy. It provides clean energy at no operating cost, however, its poor performance constitutes a serious drawback to adopt it for small application. This inefficiency is the result of involved thermal losses and the lack of full exploitation of the available energy. To exploit the maximum potential, the working fluid flow should be uniformly distributed through the collector to extract the heat from the hot absorbing surface. This study addresses the uniformity of the flow distribution for v-groove flat plate solar collector for water heating to optimize the performance of the collector. The study investigated the effect of the manifold geometry and the number of the side riser channels on the flow distribution by using numerical computational fluid dynamics simulation on Ansys Fluent Software. The mass flow rate was optimized for maximum thermal performance and then the optimum point was used for investigating the flow distribution. The simulation was validated against experimental data from literature with 99% confidence. The study found that the circular manifold gives uniform flow distribution with a standard deviation of 5% at the optimum mass flow rate of 11.5g/s. the study concluded that the tapered circular manifold is the optimum geometry for uniform flow distribution as it provides the least pressure difference inside the manifold.

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