A framework for optimisation and techno-economic analysis of CO2 pressurisation strategies for pipeline transportation | Science and Technology for Energy Transition (STET)

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Table 1

Key simulation parameters.

Parameter	Unit	Description
$\dot{m}$ $\dot{m}$	kg/s	Mass flow of CO₂ to be pressurised.
P_in	Pa	The feed pressure of the un-pressurised CO₂.
T_in	K	The feed temperature of the un-pressurised CO₂, also used for the inter-cooling temperature.
P_final	Pa	The final pressure of the pressurised CO₂.
P_liq	Pa	The liquefaction pressure. If set, this is used as the final pressure of the compression part of the pressurisation at which the CO₂ is liquefied and pumped to the final pressure.
T_liq	K	If P_liq is above the critical point, this parameter specifies the temperature the CO₂ is cooled to before being pumped in the dense phase region.
dP	Pa	Pressure drop applied to each compressor after/inter-cooler.
n_stage	–	Number of compression stages. Integer value.
ϵ_comp	–	Isentropic efficiency of the CO₂ compressors. Decimal value between 0 and 1.
ϵ_pump	–	Isentropic efficiency of the liquid/dense phase CO₂ pump. Decimal value between 0 and 1.
ϵ_refrig	–	Isentropic efficiency of the refrigerant compressor. Decimal value between 0 and 1.
T_sub	K	Sub-cooling in the refrigerant condenser.
T_sup	K	Super-heating in the refrigerant evaporator (CO₂ condenser/cooler).
T_cond	K	Condensing temperature of the refrigerant.
T_amb	K	Ambient air temperature. Used for calculation of air cooled heat exchangers.
T_cool	K	Cooling medium temperature. Used for calculation of Shell & Tube heat exchangers.

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