old_contents: 
  
  
  
  
  import numpy as np
  
  __author__ = "Jimeno A. Fonseca"
  __copyright__ = "Copyright 2020, Architecture and Building Systems - ETH Zurich"
  __credits__ = ["Jimeno A. Fonseca"]
  __license__ = "MIT"
  __version__ = "0.1"
  __maintainer__ = "Daren Thomas"
  __email__ = "cea@arch.ethz.ch"
  __status__ = "Production"
  
  # Calculates the EQUIVALENT ANNUAL COSTS (1. Step PRESENT VALUE OF COSTS (PVC), 2. Step EQUIVALENT ANNUAL COSTS)
  def calc_opex_annualized(OpC_USDyr, Inv_IR_perc, Inv_LT_yr):
      Inv_IR = Inv_IR_perc / 100
      opex_list = [0.0]
      opex_list.extend(Inv_LT_yr * [OpC_USDyr])
      opexnpv = np.npv(Inv_IR, opex_list)
      EAC = ((opexnpv * Inv_IR) / (1 - (1 + Inv_IR) ** (-Inv_LT_yr)))  # calculate positive EAC
      return EAC
  
  def calc_capex_annualized(InvC_USD, Inv_IR_perc, Inv_LT_yr):
      Inv_IR = Inv_IR_perc / 100
      return -((-InvC_USD * Inv_IR) / (1 - (1 + Inv_IR) ** (-Inv_LT_yr)))
  
new_contents: import numpy_financial as np
  
  __author__ = "Jimeno A. Fonseca"
  __copyright__ = "Copyright 2020, Architecture and Building Systems - ETH Zurich"
  __credits__ = ["Jimeno A. Fonseca"]
  __license__ = "MIT"
  __version__ = "0.1"
  __maintainer__ = "Daren Thomas"
  __email__ = "cea@arch.ethz.ch"
  __status__ = "Production"
  
  
  # Calculates the EQUIVALENT ANNUAL COSTS (1. Step PRESENT VALUE OF COSTS (PVC), 2. Step EQUIVALENT ANNUAL COSTS)
  def calc_opex_annualized(OpC_USDyr, Inv_IR_perc, Inv_LT_yr):
      Inv_IR = Inv_IR_perc / 100
      opex_list = [0.0]
      opex_list.extend(Inv_LT_yr * [OpC_USDyr])
      opexnpv = np.npv(Inv_IR, opex_list)
      EAC = ((opexnpv * Inv_IR) / (1 - (1 + Inv_IR) ** (-Inv_LT_yr)))  # calculate positive EAC
      return EAC
  
  
  def calc_capex_annualized(InvC_USD, Inv_IR_perc, Inv_LT_yr):
      Inv_IR = Inv_IR_perc / 100
      return -((-InvC_USD * Inv_IR) / (1 - (1 + Inv_IR) ** (-Inv_LT_yr)))
  
subject: Use numpy_financial