EN 15459:2007 – Energy performance of buildings – Economic evaluation procedure for energy systems in buildings
1 Scope
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 outputs
for economic calculations of energy systems related to the energy performance of buildings.
NOTE Sensitivity 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.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references,only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Not applicable.
3 Terms and definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
costs
comprise initial investment costs and annual costs, including running costs, periodic or replacement costs due to repair or change of components and systems
3.1.2
initial investment costs [C I ]
costs to be considered when the building (or the specified equipment) is delivered to the customer, ready to use.
These costs include design, purchase of systems and components, connection to suppliers, installation and commissioning process. The initial investment costs are the costs presented to the customer
3.1.3
running costs [C r ]
comprise maintenance costs, operational costs, energy costs and added costs
NOTE Running costs are annual costs.
3.1.4
maintenance costs [C m ]
annual costs for measures for preserving and restoring the desired quality of the installation. This includes annual costs for inspection, cleaning, adjustments, repair under preventive maintenance, consumable items
EN 15459:2007 – Energy performance of buildings – Economic evaluation procedure for energy systems in buildings