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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