Steam Turbine

The steam turbine is a large-scale technology connected to the district heating and electric grid. It converts hot steam into electricity and useful heat. Its heat output can be used directly for district heating.

Attribute	Description	Standard value	Unit	Data type
deployment	If set to ‘true’, the technology will be considered in the energy system model (this does not necessarily mean it will be used). Only relevant for optimisation.	False	—	bool
kW_el_max	Maximum electrical power output.	inf	kW	float
force_cap_max	Force implementation of maximum capacity specified in kW_h_max. Only relevant for optimisation.	False	kW	bool
grid_charges	Grid charges (additional cost of electricity)	0	CHF/kWh	float
cap_min_use	Minimum capacity to deploy.	0	kW	float
eta_el	Electrical conversion effiency.	0.35	—	float
htp_ratio	Heat-to-power (htp) ratio (kW_th/kW_el)	1.5	kW_th/kW_el	float
co2_intensity	Carbon-dioxide intensity of technology output (annual average value).	0	kg CO2/kWh	float
lifetime	Expected lifetime of technology before replacement is required.	25	years	int
capital_cost	CAPEX cost of technology per unit of capacity.	5000	CHF/kWp	float
maintenance_cost		10	CHF/kWp/year	int
interest_rate	Interest rate for computing levelised costs (if required).	0.025	—	float
allow_heat_export		True	—	bool
heat_export_subsidy		1e-05	CHF/kWh	float

The relationship between the in- and outflows is given by

\[\mathtt{v\_e\_st} = \mathtt{eta\_el} \cdot \mathtt{u\_steam\_st}\]

\[\mathtt{v\_h\_st} = \mathtt{htp\_ratio} \cdot \mathtt{eta\_el} \cdot \mathtt{u\_steam\_st}\]

The symbols and names of the flows are

u_steam_st	Inflow Steam
v_e_st	Outflow Electricity
v_h_st	Outflow Heat