Abstract
This paper addresses the errors associated with the gas model of the paper entitled “Role of power-to-gas in an integrated gas and electricity system in Great Britain”, International Journal of Hydrogen Energy 40 (2015) 5763–5775. The equations used for the gas model do not obey the mass and momentum equations for the (successive) steady-state or unsteady-state conditions. In addition, the impact of hydrogen concentration on some physical properties of the mixture and key performance indicators of the system was not addressed in the original paper. To illustrate the scientific flaws of the gas model of the original paper, a gas pipe with a time-varying demand profile and a fixed inlet pressure was used to find the outlet pressure, gas intake, change of linepack, and flow imbalance by three methods: 1) the proposed model of the original paper for successive steady-state conditions (Method 1), 2) PipelineStudio successive steady-state (Method 2), and 3) PipelineStudio unsteady-state (Method 3). There are large deviations between the results obtained from the original paper (Method 1) and the ones from the PipelineStudio gas simulator (Method 2 and 3).
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