Steam condensation in parallel channels with nonuniform heat removal in different zones of heat-exchange surface

Мильман, О. О.; Spalding, D. B.; Федоров, В. А.

doi:10.1016/j.ijheatmasstransfer.2012.06.016

Cited by 15 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their numerical results indicated that compared to uniform velocity profile, certain non-uniform flow profiles could lead to the reduced thermocline thickness and smaller entropy generation. This is actually in line with some observations reported in the literature [Kumar and Singh, 2019;Milman et al, 2012;Wei et al, 2015a] in that the optimal flow distribution is usually not uniform but obeys certain trend subjected to a defined optimization objective and constraints. However, controversy still exists on the relation between the optimal velocity profile and the expected thermocline evolution.…”

Section: Introductionsupporting

confidence: 92%

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Lou

Fan

Luo

2020

Journal of Energy Storage

View full text Add to dashboard Cite

Concentrated Solar Power (CSP) technology captures solar radiation and converts it into heat for electricity production. It has received an increasing attention because integrated thermal energy storage (TES) systems can largely enhancing the reliability and the dispatchability. Over the last decade, low-cost single storage tank based on the thermocline technology becomes an alternative to commonly-used two-tank TES system. However, the improper inlet/outlet manifolds may cause the strong mixing of hot and cold fluids and disturb the temperature stratification, resulting in reduced thermal performances of the storage tank. This study aims at solving the flow maldistribution problem in the single-tank thermocline storage system by appropriately structuring the inlet/outlet manifolds. The technical solution is based on the insertion of optimized perforated baffles in the manifolds. 2D Computational fluid dynamics simulations were performed to calculate the transient flow and temperature profiles in the storage tank during the charging and discharging operations. The optimal size distribution of orifices on the upper baffle has been determined for homogenizing passage times of the thermal front, so as to enhance the temperature stratification. A novel intermediate evaluation indicator was introduced to characterize the real-time thermal behavior, which could reduce the computational cost of the optimization problem by a factor of 6 at least. Numerical results shown that the proposed optimization algorithm could significantly improve the thermal performances, indicated by the increased values of charging/discharging efficiency, the capacity ratio and the overall efficiency, ex., the fully charging efficiency be increased by 29% by comparing the unstructured manifold geometry and the one with optimized baffles. The parametric study on certain geometry and operating factors also demonstrated that the proposed method for flow distribution optimization was robust, effective and efficient.

show abstract

Section: Introductionsupporting

confidence: 92%

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Lou

Fan

Luo

2020

Journal of Energy Storage

View full text Add to dashboard Cite

show abstract

“…Under these circumstances, the intentional flow non-uniform distribution may be a better option to be adapted to decrease the local maximum temperature, as pointed out by Kumar and Singh [13]. This is actually in line with some observations reported in the literature [30][31][32] in that the optimal flow distribution is usually not uniform but obeys certain trends subjected to a defined optimization objective and constraints. In this regard, Kumar and Singh [13] indicated that the flow arrangement and the actual flow distribution should fit the heat flux shape to achieve a better thermal performance, i.e., lower maximum temperature and thermal resistance.…”

Section: Introductionsupporting

confidence: 79%

Tailoring the fluid flow distribution in a parallel mini-channel heat sink under multiple-peak heat flux

Roux

Castlain

et al. 2022

Thermal Science and Engineering Progress

View full text Add to dashboard Cite

“…Once the reliable technique has been established for the precise measurement of flow distribution, the next task is how to control the flow distribution properties so as to improve the global performances of tubular process equipment or energy conversion systems. In some cases, a uniform distribution among parallel channels is generally required, while in many other cases, a target flow distribution which is non‐uniform should be achieved . In our earlier work, an original CFD‐based evolutionary algorithm has been proposed to realize uniform or non‐uniform fluid flow distribution among parallel channels .…”

Section: Discussionmentioning

confidence: 99%

Experimental measurement of flow distribution in a parallel mini‐channel fluidic network using PIV technique

Boutin

Wei

Fan

2016

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Fluid flow distribution among parallel channels usually play an important role on the global performance improvement of tubular process equipment, but remains difficult to be properly measured by experimental methods. This paper presents a systematic study on the measurement of flow distribution in a multi-channels fluidic network using PIV technique. For the precise measurement of flow-rate in each individual channel, standard 2D-2C PIV technique is used to obtain velocity vectors on multiple sampling planes parallel to the flow direction, so as to reconstruct accurate velocity profiles on the cross-sectional surface. Such procedure is repeated for every channel to obtain the actual flow distribution properties in the fluidic network. Pre-test results on a double-channels device indicate that the maximum possible deviation of PIV measurements is 13.1% with respect to those of a flange flowmeter, implying that the PIV technique is relatively accurate and reliable. PIV results on the flow distribution in a 15-channels fluidic network are then compared with CFD simulation results under the same working conditions. A quite good agreement could be observed. Moreover, the locations and sizes of vortices in the distributor have a significant influence on the flow distribution.

show abstract

Steam condensation in parallel channels with nonuniform heat removal in different zones of heat-exchange surface

Cited by 15 publications

References 1 publication

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Single-tank thermal energy storage systems for concentrated solar power: Flow distribution optimization for thermocline evolution management

Tailoring the fluid flow distribution in a parallel mini-channel heat sink under multiple-peak heat flux

Experimental measurement of flow distribution in a parallel mini‐channel fluidic network using PIV technique

Contact Info

Product

Resources

About