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Exploitation of phase change materials for temperature control during the fast filling of hydrogen cylinders

Exploitation of phase change materials for temperature control during the fast filling of hydrogen cylinders
Exploitation of phase change materials for temperature control during the fast filling of hydrogen cylinders
This paper explores the use of phase change materials for the fast filling of hydrogen cylinders in order to limit the rise in the gas temperature by enhancing heat transfer from the gas. It is necessary to limit the temperature rise because the structural performance of the cylinder materials can be degraded at higher temperatures. Initially, two computational approaches for modelling the fast filling of hydrogen cylinders are presented and validated; the first is an axisymmetric computational fluid dynamics simulation and the second is a single-zone approach with one-dimensional conjugate heat transfer through the cylinder walls. The effect of incorporating paraffin wax-based phase change material within the cylinder structure has been investigated using the single-zone model. The predictions show that use of pure paraffin wax does not help to reduce the gas temperature due to its low thermal conductivity, however materials with improved thermal conductivity, for example mixtures of paraffin wax and graphite, can facilitate reduced fill times. The impact of phase change material is assessed in the case of a production hydrogen-powered passenger car. Without use of phase change material it is not possible to reduce the fill time below three minutes unless the gas supply is pre-cooled. While the fill time can be reduced by precooling the gas supply, the phase change material reduces the degree of pre-cooling required for a given fill time by 10-20 K, and reduces the minimum power consumption of the cooler by as much as 0.5% of the fuel’s calorific value.
Begell House
Ramasamy, Vishagen
841e67b0-facb-4c09-a272-a266f768d533
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Reed, Philippa
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Hepples, Warren
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Wheeler, Andrew J.
8b260014-adb4-46b4-9245-e8b17f4d1bdb
Ramasamy, Vishagen
841e67b0-facb-4c09-a272-a266f768d533
Richardson, Edward
a8357516-e871-40d8-8a53-de7847aa2d08
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Hepples, Warren
2ef2a0f5-159e-4601-b48f-81d015fa9381
Wheeler, Andrew J.
8b260014-adb4-46b4-9245-e8b17f4d1bdb

Ramasamy, Vishagen, Richardson, Edward, Reed, Philippa, Hepples, Warren and Wheeler, Andrew J. (2018) Exploitation of phase change materials for temperature control during the fast filling of hydrogen cylinders. In Proceedings of CHT-17 ICHMT International Symposium on Advances in Computational Heat Transfer May 28-June 1, 2017, Napoli, Italy. Begell House..

Record type: Conference or Workshop Item (Paper)

Abstract

This paper explores the use of phase change materials for the fast filling of hydrogen cylinders in order to limit the rise in the gas temperature by enhancing heat transfer from the gas. It is necessary to limit the temperature rise because the structural performance of the cylinder materials can be degraded at higher temperatures. Initially, two computational approaches for modelling the fast filling of hydrogen cylinders are presented and validated; the first is an axisymmetric computational fluid dynamics simulation and the second is a single-zone approach with one-dimensional conjugate heat transfer through the cylinder walls. The effect of incorporating paraffin wax-based phase change material within the cylinder structure has been investigated using the single-zone model. The predictions show that use of pure paraffin wax does not help to reduce the gas temperature due to its low thermal conductivity, however materials with improved thermal conductivity, for example mixtures of paraffin wax and graphite, can facilitate reduced fill times. The impact of phase change material is assessed in the case of a production hydrogen-powered passenger car. Without use of phase change material it is not possible to reduce the fill time below three minutes unless the gas supply is pre-cooled. While the fill time can be reduced by precooling the gas supply, the phase change material reduces the degree of pre-cooling required for a given fill time by 10-20 K, and reduces the minimum power consumption of the cooler by as much as 0.5% of the fuel’s calorific value.

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RamasamyJCompThermSci2018
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Published date: 12 March 2018

Identifiers

Local EPrints ID: 418737
URI: http://eprints.soton.ac.uk/id/eprint/418737
PURE UUID: 89e15865-027b-4783-844f-ca89a15a8ad6
ORCID for Philippa Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 21 Mar 2018 17:30
Last modified: 22 Nov 2021 02:37

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Contributors

Author: Vishagen Ramasamy
Author: Philippa Reed ORCID iD
Author: Warren Hepples
Author: Andrew J. Wheeler

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