====== Cogeneration efficiency ======
[[c_cogen_more|Centralized]] and [[d_cogen_more|decentralized cogeneration]] systems has two efficiencies as they deliver two products (heat & electricity):

$\eta_{th} = \frac{Q^-}{Q+}$
^$\eta_{th}$ |Thermal efficiency [%] |
^$Q^-$ |Heat delivered by the cogeneration system [W] |
^$Q^+$ |Heat delivered by the fuel combustion (LHV basis) [W] |

$\eta_{el} = \frac{E^-}{Q+}$
^$\eta_{el}$ |Electrical efficiency [%] |
^$Q^-$ |Electricity delivered by the cogeneration system [W] |
^$Q^+$ |Heat delivered by the fuel combustion (LHV basis) [W] |