The Experts below are selected from a list of 9732 Experts worldwide ranked by ideXlab platform
Kemal Ermis - One of the best experts on this subject based on the ideXlab platform.
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heat transfer analysis of phase change process in a Finned Tube thermal energy storage system using artificial neural network
International Journal of Heat and Mass Transfer, 2007Co-Authors: Aytunc Erek, Kemal Ermis, Ibrahim DincerAbstract:In this study, a feed-forward back-propagation artificial neural network (ANN) algorithm is proposed for heat transfer analysis of phase change process in a Finned-Tube, latent heat thermal energy storage system. Heat storage through phase change material (PCM) around the Finned Tube is experimentally studied. A numerical study is performed to investigate the effect of fin and flow parameter by the solving governing equations for the heat transfer fluid, pipe wall and phase change material. Learning process is applied to correlate the total heat stored in different fin types of Tubes, various Reynolds numbers and different inlet temperatures. A number of hidden numbers of ANN are trained for the best output prediction of the heat storage. The predicted total heat storage values obtained by an ANN model with extensive sets of non-training experimental data are then compared with experimental measurements and numerical results. The trained ANN model with an absolute mean relative error of 5.58% shows good performance to predict the total amount of heat stored. The ANN results are found to be more accurate than the numerical model results. The present study using ANN approach for heat transfer analysis in phase change heat storage process appears to be significant for practical thermal energy storage applications.
Amir Faghri - One of the best experts on this subject based on the ideXlab platform.
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heat transfer enhancement in latent heat thermal energy storage system by using the internally Finned Tube
International Journal of Heat and Mass Transfer, 1996Co-Authors: Yuwen Zhang, Amir FaghriAbstract:The heat transfer enhancement in the latent heat thermal energy storage system by using an internally Finned Tube is presented in this paper. The phase change material fills the annular shell space around the Tube, while the transfer fluid flows within the internally Finned Tube. The melting of the phase change material is described by a temperature transforming model coupled to the heat transfer from the transfer fluid. The heat conduction in the internal fins is an unsteady two-dimensional heat conduction problem and is solved by a finite difference method. The results showed that adding internal fins is an efficient way to enhance the heat transfer in thermal energy storage systems when a fluid with a low thermal conductivity is used as the transfer fluid.
Ya-ling He - One of the best experts on this subject based on the ideXlab platform.
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parameter effect of a phase change thermal energy storage unit with one shell and one Finned Tube on its energy efficiency ratio and heat storage rate
Applied Thermal Engineering, 2016Co-Authors: Wei Wei Wang, Liang Bi Wang, Ya-ling HeAbstract:Abstract The performance of a phase change thermal energy storage (PCTES) unit using circular Finned Tube is affected by many parameters. Thorough studies of the parameter effect on the performance of PCTES unit are strongly required in its optimum design process. Based on a reported energy efficiency ratio and a newly defined parameter named the heat storage rate, the parameter effect on the performance of PCTES unit using circular Finned Tube is numerically investigated. When the fin pitch is greater than 4 times of the inner radius of the Tube, the fin height and the fin thickness have little effect on the energy efficiency ratio and the heat storage rate. When the fin pitch is small, the performance of PCTES unit becomes better using large fin height and width. The energy efficiency ratio and the heat storage rate are more sensitive to the outer Tube diameter. The performance of PCTES unit using circular Finned Tube is best when water is used as the heat transfer fluid (HTF). When the fluid flow of HTF is in a laminar state, the energy efficiency ratio and the heat storage rate are larger than that in a turbulent state.
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numerical simulation of Finned Tube bank across a staggered circular pin Finned Tube bundle
Numerical Heat Transfer Part A-applications, 2015Co-Authors: En Tian, Ya-ling HeAbstract:In this paper, fluid flow and heat transfer over a three-dimensional staggered circular-pin-Finned Tube bundle heat exchanger surface have been numerically investigated. The effects of six geometric parameters and pin-fin arrangement in the flow direction on the thermo-hydraulic performance are investigated in details by adopting the performance evaluation plot of enhanced heat transfer oriented for energy-saving. The results show that the pin-fin diameter d, pin-fin length H, and pin-fin number around the Tube N have positive effects on improving thermo-hydraulic performance, but the transverse Tube pitch S1 and the fin axial pitch S1,pf have negative effects, whereas the longitudinal Tube pitch S2 and the fin arrangement in flow direction (in-line or staggered) have little effects.
Chi-chuan Wang - One of the best experts on this subject based on the ideXlab platform.
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Airside Performance of H-Type Finned Tube Banks with Surface Modifications
MDPI AG, 2019Co-Authors: Pradhyumn Bhale, Mrinal Kaushik, Jane-sunn Liaw, Chi-chuan WangAbstract:The present study numerically investigates some novel modifications to augment the performance of the H-type Finned Tube banks, which are widely used in waste heat recovery in industries. The imposed modifications upon the original H-type Finned Tube banks include the following: (1) Design 1 contains some triangular cuts at the edge of the original rectangular fin; (2) Design 2 modifies the original rectangular geometry into a trapezoid shape; (3) Design 3 renders the original rectangular cross-section fin thickness into trapezoid cross-section; and (4) Design 4 changes the original rectangular shape into a circular shape. Based on the simulations, it is found that Design 1 shows barely any improvements in the heat transfer performance and surface area reduction. Design 2 can provide some weight saving and surface area reduction at a slightly inferior heat transfer performance. Design 3 can offer up to 14% improvements in the overall heat transfer performance without any pumping power penalty. Yet, Design 4 provides the maximum weight saving as compared to the original reference case. With 3⁻9% lesser surface area than the reference case, Design 4 still offers marginally higher heat transfer performance
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the effects of frost thickness on the heat transfer of Finned Tube heat exchanger subject to the combined influence of fan types
Applied Thermal Engineering, 2008Co-Authors: Jeng Min Huang, Wen Chien Hsieh, Chi-chuan WangAbstract:Abstract This study conducts a numerical study concerning the effect of frost thickness on the heat transfer performance of a four rows plate Finned Tube heat exchanger. Calculations are made under constant air volume and variable air volume conditions. It is found that the initial surge of heat transfer rate in the frosted Finned Tube heat exchanger is mainly associated with the critical radius effect rather than the surface roughness. The frost thermal conductivity plays an important role in the surge phenomenon. There is hardly any initial surge when frost thermal conductivity is below 0.1 W m−1 K−1. It is also recommended that a refrigerator should defrost when half of a single flow channel area is blocked by frost. The calculations also reveal that a centrifugal fan is recommended with a small fin-pitch heat exchanger. However, if a long term operation at a thick frost situation is unavoidable, an axial fan should be selected. There is no great difference between selection of an axial fan or centrifugal fan for a larger fin pitch heat exchanger.
Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.
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heat transfer analysis of phase change process in a Finned Tube thermal energy storage system using artificial neural network
International Journal of Heat and Mass Transfer, 2007Co-Authors: Aytunc Erek, Kemal Ermis, Ibrahim DincerAbstract:In this study, a feed-forward back-propagation artificial neural network (ANN) algorithm is proposed for heat transfer analysis of phase change process in a Finned-Tube, latent heat thermal energy storage system. Heat storage through phase change material (PCM) around the Finned Tube is experimentally studied. A numerical study is performed to investigate the effect of fin and flow parameter by the solving governing equations for the heat transfer fluid, pipe wall and phase change material. Learning process is applied to correlate the total heat stored in different fin types of Tubes, various Reynolds numbers and different inlet temperatures. A number of hidden numbers of ANN are trained for the best output prediction of the heat storage. The predicted total heat storage values obtained by an ANN model with extensive sets of non-training experimental data are then compared with experimental measurements and numerical results. The trained ANN model with an absolute mean relative error of 5.58% shows good performance to predict the total amount of heat stored. The ANN results are found to be more accurate than the numerical model results. The present study using ANN approach for heat transfer analysis in phase change heat storage process appears to be significant for practical thermal energy storage applications.