CHP District Energy System

The project is in Spain, Barcelona

Marcus, thanks for your guidance. Instead of DESv2 Option 1, we are looking into DESv2 Option 2 in order to account for DES actual efficiencies. The DES we will be connected to includes a cogeneration plant producing heat, cold and electricity. The input energy of the DES is biomass and gas. The DES provides hot and cold water to its network of customers. The net electricity they produce is not sold to their customers but to a utility company. The cogeneration plant consumes 28 units of biomass to produce 12 units of electricity and 9 units of heat. 4 units of electricity are consumed by the DES itself (for chillers to produce cold water and distribution pumps). The 8 remaining units of electricity are sold to the utility company. The heat is complemented with additional heat generated by a gas boiler using 4 units of gas and distributed as hot water to the clients. The DES distributes 12 units of hot water and 8 units of cold water to their clients. We would like to use Option 2 of the DES guidelines. For this situation, the baseline would be modelled as per Appendix G with electricity for cooling and gas for heating. According to the Option 2, DES guidelines, the proposed case will have the chillers and boiler of the DES plant and the cost of the produced energy is calculated as follows: cost of biomass divided by the total thermal outputs of the plant (cost of 28 units of biomass + 4 units of gas / (12+8 units of thermal outputs = $/kWh). If this is correct we are including energy inputs associated with the electricity sold to a third party (the utility). How do we take this into account?

Marcus, thank you for your guidance. In order to account for actual DES efficiencies, we are looking at DESv2 Option 2. The DES we will be connected to includes a cogeneration plant producing heat, cold and electricity. The input energy of the DES is biomass and gas. The DES provides hot and cold water to its network of customers. The net electricity they produce is not sold to their customers but to a utility company. The cogeneration plant consumes 28 units of biomass to produce 12 units of electricity and 9 units of heat. 4 units of electricity are consumed by the DES itself (for chillers to produce cold water and distribution pumps). The heat is complemented with additional heat generated by a gas boiler using 4 units of gas and distributed as hot water to the clients. So, with 28 units of biomass and 4 units of gas, the DES distributes 12 units of hot water and 8 units of cold water to their clients while selling 8 units of electricity to the utility company. According to Option 2 of the DES guidelines, the baseline would be modelled as per Appendix G with electricity for cooling and gas for heating. For the proposed case, we simulate the chillers and boiler of the DES plant and the cost of the produced energy is calculated as follows: cost of biomass divided by the total thermal outputs of the plant (cost of 28 units of biomass + 4 units of gas / (12+8 units of thermal outputs = $/kWh). If this is correct we are including energy inputs associated with the electricity sold to a third party (the utility). How do we take this into account?