deflex.finnish_method¶

deflex.finnish_method(eta_e, eta_th, eta_e_ref, eta_th_ref)[source]¶

Alternative Generation or Finnish Method - a method to allocate the fuel input of chp plants to the two output flows: heat and electricity

The allocation factor $\alpha_{el}$ of the electricity output is calculated as follows:

$\alpha_{el} = \frac{\eta_{el,ref}}{\eta_{el}} \cdot \left( \frac{\eta_{el}}{\eta_{el,ref}}+ \frac{\eta_{th}}{ \eta_{th,ref}} \right)$

$\alpha_{el}$ : Allocation factor of the electricity flow

$\eta_{el}$ : Efficiency of the electricity output in the chp plant

$\eta_{th}$ : Efficiency of the thermal output in the chp plant

$\eta_{el,ref}$ : Efficiency of the reference power plant

$\eta_{th,ref}$ : Efficiency of the reference heat plant

Parameters:	eta_e (numeric) – The efficiency of the electricity production in the chp plant. Mandatory in the following functions: alternative_generation, exergy, iea, efficiency eta_th (numeric) – The efficiency of the heat output in the chp plant. Mandatory in the following functions: alternative_generation, exergy, iea, efficiency eta_e_ref (numeric) – The efficiency of the best power plant available on the market and economically viable in the year of construction of the CHP plant. Mandatory in the following functions: alternative_generation eta_th_ref (numeric) – The efficiency of the best heat plant available on the market and economically viable in the year of construction of the CHP plant. Mandatory in the following functions: alternative_generation
Returns:	Allocation factor for the electricity flow
Return type:	numeric

Examples

>>> round(finnish_method(0.3, 0.5, 0.5, 0.9), 3)
0.519