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Table 2 Nomenclature profit function

From: Upscaling a district heating system based on biogas cogeneration and heat pumps

Term

Signification (unit: €/year)

P E,grid,sell

Profit made on electricity sold to the grid

P Q,dh,h

Profit made on heat sold through the DH network

P Q,hp,h

Profit made on heat sold to houses fitted with a heat pump

P Q,dh,c

Profit made on cooling sold through the DH network

P Q,hp,c

Profit made on cooling sold to houses fitted with a heat pump

C E,grid,buy

Costs of electricity bought from the grid

C biogas

Costs of biogas supply to the DH system

C ngas

Costs of natural gas supply to the DH system

C cap,j

Capital costs of investments and required future re-investments into specific equipment type j

C op,j

Operational costs (operator, maintenance, insurance, etc) of specific equipment type j

chp, b, hp, stochp,stohp

Specific equipment: CHP, boiler, heat pump, storage related to the CHP, storage related to the heat pumps