Improvement of thermal performance of spiral heat exchanger on hydrogen storage by adding copper fins

An optimization study on the finned tube heat exchanger used in hydride hydrogen storage system – analytical method and numerical simulation

“…(20). Actually, f is a constant in the range of 0e1 to reflect the ratio of fin volume to reactor volume.…”

“…Therefore, internal heat transfer enhancements have become more attractive and can roughly be divided in two ways: -Thermal conductivity enhancement by insertion of metal matrices of high thermal conductivity, such as copper wire net structure [12], copper or aluminum foam [13,14]. -Integration of heat exchanger inside the bed, such as bundle of tubes [15], finned tube heat exchanger [16,17], spiral heat exchanger [18], finned spiral heat exchanger [19,20].…”

“…The results clearly demonstrated the rate of charging/discharging increase with the augmentation of tubular heat exchanges. Dhaou et al [20] experimentally studied hydrogen storage based on metal hydride vessel equipped with a finned spiral heat exchanger, the results showed that the charging time of the reactor is considerably reduced when finned spiral heat exchanger is used. In addition, the choice of parameters, such as flow mass and temperature of the cooling fluid, applied pressure, hydrogen tank volume is important.…”

Hydrogen discharging and thermal behaviors of ZrCo based hydrogen storage beds equipped with heat-fins or metal-foam

“…Recently, various heat transfer enhanced bed designs have been proposed, and subsequently built and tested during hydrogen absorption and desorption processes [1][2][3]. Kang et al [1] tested a thin double-layered annulus MHB and reported that a recovery rate of 72.5 Pa m 3 /s and a delivery rate of 15.6 Pa m 3 /s were achieved during 90% absorption and desorption processes, respectively.…”

“…Kang et al [1] tested a thin double-layered annulus MHB and reported that a recovery rate of 72.5 Pa m 3 /s and a delivery rate of 15.6 Pa m 3 /s were achieved during 90% absorption and desorption processes, respectively. Dhaou et al [2] conducted hydrogen Abbreviation: Cond, conductivity; EV, expansion volume; H/M, hydrogen to metal atomic ratio; HF, copper heat-fin; MF, copper metal-foam; MH, ZrCo metal hydride; MHB, metal hydride beds; STS, stainless steel.…”