EN 15459:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions, symbols and units
  3.1 Terms and definitions
  3.2 Symbols and units
4 Organisation of the costs
5 Basic calculations
  5.1 Interest rate, discount rate, present value factor and
      annuity factor
      5.1.1 Real interest rate
      5.1.2 Discount rate
      5.1.3 Present value factor
      5.1.4 Annuity factor
  5.2 Global cost
      5.2.1 Principles of the calculation
      5.2.2 Calculation of the final value
  5.3 Annuity calculation
      5.3.1 General
      5.3.2 Annuity calculation for unchanged components during
            the design payback period of the building
      5.3.3 Annuity calculation for replaced components
      5.3.4 Annuity calculation for running costs
      5.3.5 Influence of price development for dynamic calculations
6 Principles of the method
  6.1 General
  6.2 STEP 1 - Financial data
      6.2.1 Duration of the calculation
      6.2.2 Financial rate
      6.2.3 Human operation costs
      6.2.4 Energy prices
  6.3 STEP 2 - General information about the project
      6.3.1 Identification of systems
      6.3.2 Environment of the project
      6.3.3 Meteorological and environmental data (not mandatory)
      6.3.4 Constraints/opportunity related to energy
  6.4 STEP 3 - Systems characteristics
      6.4.1 Data collection
      6.4.2 STEP 3.1 - Investment costs for systems related to energy
      6.4.3 STEP 3.2 - Periodic costs for replacements
      6.4.4 STEP 3.3 - Running costs except energy costs
  6.5 STEP 4 - Energy costs
      6.5.1 General
      6.5.2 STEP 4.1 - Calculation of energy consumption
      6.5.3 STEP 4.2 - Energy costs
  6.6 STEP 5 - GLOBAL COST CALCULATION
      6.6.1 Step 5.1 Calculation of replacement costs
      6.6.2 Step 5.2 Calculation of final value
      6.6.3 Step 5.3 Calculation of global cost
  6.7 STEP 6 - ANNUITY COST CALCULATION
Annex A (informative) Economical data for energy systems
Annex B (informative) Systems description
Annex C (informative) Calculation sheet for global cost calculation
Annex D (informative) Annuity calculation, organisation of data and
        results
Annex E (informative) Example 1 - Dwelling 100 m[2] with gas heating
        system
      E.1 STEP 1 - Financial Data
      E.2 STEP 2 - General information about project
          E.2.1 Identification of systems
          E.2.2 Environment of the project
          E.2.3 Meteorological and environmental data (for information)
      E.3 STEP 3 - System characteristics
          E.3.1 STEP 3.1 - Investment costs for building construction
                and systems related to energy
          E.3.2 STEP 3.2 - Periodic costs for replacements
          E.3.3 Step 3.3 - Running costs except energy costs
      E.4 STEP 4 - Energy costs
          E.4.1 STEP 4.1 - Energy consumption
          E.4.2 Step 4.2 - Energy costs
      E.5 STEP 5 - Global costs
          E.5.1 Step 5.1 and 5.2 - Calculation of replacement costs and
                final value
          E.5.2 Step 5.3 - Global cost report
      E.6 STEP 6 - Annuity calculation costs
Bibliography

This standard provides a calculation method for the economical issues of heating systems and other systems that are involved in the energy demand and energy consumption of the building. This standard applies to all types of buildings.The fundamental principles and terminology are explained in this standard. The main items of the standard are:-definitions and structure of the types of costs, which shall be taken into account for calculation of the economical efficiency of saving options in buildings;-data needed for definition of costs related to systems under consideration;-calculation method(s);-expression of the result of the economic calculation;-informative annexes indicating default values of e.g. lifetime, costs for repair, costs for maintenance, in order to introduce default values for calculations.This standard is applicable to calculation of economic performance of energy saving options in buildings (e.g. insulation, better performing generators and distribution systems, efficient lighting, renewable sources, combined heat and power).The scope of this standard is to standardise: -required inputs;-calculation methods;-required outputsfor economic calculations of energy systems related to the energy performance of buildings.NOTESensitivity of results increases with the number of parameters under consideration (e.g. lifetime, interest rates, development of different types of costs). The more parameters one changes when comparing different solutions, the more difficult it is to draw conclusions from the economic results of the calculations. Economical results are closely related to the specific project under consideration, and no general conclusions should be drawn from any such results.