Numerical Study of Solid State Hydrogen Storage System with Finned Tube Heat Exchanger

2019 ◽  
Vol 41 (6-7) ◽  
pp. 484-496 ◽  
Author(s):  
Vikas Keshari ◽  
Prakash M. Maiya
Keyword(s):  
Heat Exchanger ◽  
Solid State ◽  
Hydrogen Storage ◽  
Numerical Study ◽  
Storage System ◽  
Finned Tube ◽  
Tube Heat Exchanger ◽  
Hydrogen Storage System ◽  
Finned Tube Heat Exchanger

Selection of a Heat Exchanger for a Small-Scale Liquid Air Energy Storage System

2021 ◽  
Author(s):  
Alexander S. Fredrickson ◽  
Anthony G. Pollman ◽  
Anthony J. Gannon ◽  
Walter C. Smith
Keyword(s):  
Energy Storage ◽  
Heat Exchanger ◽  
Liquid Nitrogen ◽  
Material Selection ◽  
Storage System ◽  
Energy Storage System ◽  
Finned Tube ◽  
Small Scale ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger

Abstract This paper presents the results of a theoretical analysis of a heat exchanger design for the challenging application of a small-scale modified Linde-Hampson cycle liquid air energy storage system (LAESS). A systems engineering approach was taken to determine the best heat exchanger alternative for incorporation into an existing LAESS. Two primary heat exchanger designs were analyzed and compared: a finned tube heat exchanger (FTHE) design and a printed circuit heat exchanger (PCHE) design. These designs were chosen as alternatives due to the gas-to-gas cooling that occurs in the heat exchanger, and material selection was based on the requirement for the heat exchanger to withstand the cryogenic temperatures required for the system to produce liquid nitrogen. Thermodynamic analysis was conducted using the ε-NTU method and fin theory to determine the dimensional requirements for the finned tube heat exchanger and a trade-off study was conducted to compare the alternatives. Based on the results from the study, the PCHE was the preferred alternative due to an inherent small footprint, comparable cost to manufacture, simple integration into the LAESS and inherent safety features that are critical when working with high pressure systems. Future work will include subsystem and system integration and testing to obtain a consistently functional prototype that produces liquid nitrogen.

Effect of tube shape on the performance of a fin and tube heat exchanger

2020 ◽  
Vol 14 (2) ◽  
pp. 6709-6718
Author(s):  
Djamel Sahel ◽  
Houari Ameur ◽  
Mustapha Mellal
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Study ◽  
Reynolds Numbers ◽  
Finned Tube ◽  
Moderate Pressure ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger ◽  
Tube Shape ◽  
Different Shapes

A numerical study is carried out to test the effect of tube shape on heat transfer and fluid flow in a finned tube heat exchanger. The effects of different shapes (circular, flat, elliptical and oval in both orientations: left and right) are analyzed. The simulations are carried out for two-dimensional and external flow of an incompressible fluid with Reynolds numbers varying between 3000 and 20000. The results obtained indicate that the shape of the tube directly affects the thermal and dynamic behaviors of a fin and tube heat exchanger. Where the circular tube ensures higher heat transfer coefficient of about 18% than the flat tube, and it generate a moderate pressure drop of about 10% in the same conditions. Also, some reliable empirical correlations are proposed to predict the Nusselt number and the friction factor.

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