Analytical and experimental investigation of thermal stratification in storage tanks

1993 ◽  
Vol 17 (2) ◽  
pp. 77-88 ◽  
Author(s):  
N. M. Al-Najem ◽  
A. M. Al-Marafie ◽  
K. Y. Ezuddin
Keyword(s):  
Experimental Investigation ◽  
Thermal Stratification ◽  
Storage Tanks

Numerical modeling and optimization of thermal stratification in solar hot water storage tanks for domestic applications: CFD study

Solar Energy ◽  
2017 ◽  
Vol 157 ◽  
pp. 441-455 ◽  
Author(s):  
T. Bouhal ◽  
S. Fertahi ◽  
Y. Agrouaz ◽  
T. El Rhafiki ◽  
T. Kousksou ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Thermal Stratification ◽  
Water Storage ◽  
Hot Water ◽  
Storage Tanks ◽  
Modeling And Optimization

Effect of Size and Slip Coefficient of a Porous Manifold on Thermal Stratification in Storage Tanks

2009 ◽  
Author(s):  
N. M. Brown ◽  
F. C. Lai
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Numerical Simulations ◽  
Storage Tank ◽  
Richardson Number ◽  
Thermal Stratification ◽  
Temperature Fields ◽  
Storage Tanks ◽  
Slip Coefficient ◽  
Wide Range

Numerical simulations have been performed to study the effects of size and slip coefficient of a porous manifold on the thermal stratification in a storage tank. The model is used to predict the development of flow and temperature fields during a charging process. Computations have covered a wide range of the Grashof number (1.8 × 105 < Gr < 1.8 × 108) and Reynolds number (10 ≤ Re ≤ 104), or in terms of the Richardson number, 10−2 < Ri < 105. The results obtained compare favorably well with the experimental data. In addition, the present results have confirmed the effectiveness of porous manifold in the promotion of thermal stratification and provide useful information for the design of such system.

What is the Best Solution to Improve Thermal Performance of Storage Tanks With Immersed Heat Exchangers: Baffles or a Divided Tank?

2008 ◽  
Author(s):  
Aaron D. Wade ◽  
Jane H. Davidson ◽  
Julia F. Haltiwanger
Keyword(s):  
Heat Exchanger ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Thermal Stratification ◽  
Storage Tanks ◽  
Stored Energy ◽  
Tubular Heat Exchanger ◽  
Energy Delivery ◽  
Potential Methods

Prior studies of indirect water storage tanks that employ an immersed heat exchanger to discharge the stored energy have identified two potential methods of improving the rate of energy extraction: 1) an internal baffle to increase the velocity across the heat exchanger, and 2) a divided storage compartment to achieve thermal stratification. Thermal performance of these two options is compared to that of a conventional cylindrical tank during transient discharge. Each tank has a storage volume of 350 liters and a 10 m long, 0.3 m2 coiled tubular heat exchanger. For the specific configurations evaluated, the baffled heat exchanger provides the highest energy delivery rates and heat exchanger outlet temperatures. An analytic model shows the advantage of the divided storage depends on the NTU of the immersed heat exchanger. The heat exchanger employed in the present study is too small to realize the potential benefit of a divided storage. Both options, if used in the appropriate system, can improve thermal performance as measured by the rate and quality of delivered energy. The baffle is most appropriate when storage-side natural convection is the largest thermal resistance of the heat exchanger. The divided tank is useful when the NTU of the heat exchanger exceeds three.

Analysis of the Accumulated Energy by Thermal Stratification of Liquid Inside Storage Tanks with Porous Layers

2008 ◽  
Vol 53 (4) ◽  
pp. 377-391 ◽  
Author(s):  
Santiago del Rio Oliveira ◽  
Alcides Padilha ◽  
Vicente Luiz Scalon
Keyword(s):  
Thermal Stratification ◽  
Storage Tanks ◽  
Porous Layers
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