The scope of this European Standard is:
To define the procedure how the calculation methods to determine the temperatures, sensible
loads and energy demands for the rooms shall be used in the design process.
To describe the calculation methods to determine the latent room cooling and heating load, the
building heating, cooling, humidification and dehumidification loads and the system heating,
cooling, humidification and dehumidification loads.
To define the general approach for the calculation of the overall energy performance of buildings
with room conditioning systems.
To describe one or more simplified calculation methods for the system energy requirements of
specific system types, based on the building energy demand result from prEN ISO 13790, and to
define their field of application.
A general framework standard is given which imposes an hourly calculation for all cases which cannot
be covered by simplified methods, and gives requirements on what has to be taken into account.
Input and output data are defined.
The target audience of this standard is twofold:
Designers of HVAC systems, which are given an overview of the design process with the relevant
references to the different involved standards (Clauses 5 to 12).
Developers of regulations and tools, which find requirements for calculation procedures to be
used for the energy requirements according to the EPBD (Clauses 13 and 14).
The idea followed by this standard is, that for the detailed approach one single calculation method is
used for the different room related purposes such as room temperature calculation, room cooling and
heating load calculation, and room energy calculation. This means, for the building type envisaged
(buildings with room conditioning systems) it is an alternative to simplified calculation methods such
as heating load according to EN 12831 and heating energy according to prEN ISO 13790. This
standard does not describe any detailed methods for the sensible room based calculations. For this it
refers to the relevant standards EN ISO 13791, EN ISO 13792, EN 15255 and EN 15265.
This standard specifies simplified methods and describes the necessary functionality of methods for
the calculation of standardized annual energy consumption by systems providing temperature control,
mechanical ventilation and humidity control in existing and new buildings. For brevity, these are
described as HVAC systems. These systems may provide any or all of these services, including
heating, cooling, air filtration, humidification or dehumidification. For the air side calculations of air
based systems it refers to EN 15241. Systems providing heating but no other services are covered by
EN 15316. These boundaries are, however, not kept strictly in the informative annexes, because
some of the shown example calculations follow a holistic approach and this separation is therefore not
always possible.
The standard specifically relates to demand calculations needed for Energy Performance Rating in
connection with the Energy Performance of Buildings Directive.
These installations may include:
Emission, distribution, storage and generation for cooling.
Emission, distribution and heat exchanger for heating if these functions are performed using an
air conditioning system; all heating functions performed by direct heating or using water as a heat
transport medium are treated in other standards.
The calculation of cooling and heating energy demand within buildings is dealt with by prEN ISO
13790 and is a required input. This standard only addresses these issues to the extent that HVAC
systems have an influence on the loads.
EN 15243:2007 Referenced Document
EN 13779 Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems
EN 15026 Hygrothermal performance of building components and building elements - Assessment of moisture transfer by numerical simulation*， 2023-07-26 Update
EN 15241 Ventilation for buildings - Calculation methods for energy losses due to ventilation and infiltration in commercial buildings
EN 15242:2007 Ventilation for buildings - Calculation methods for the determination of air flow rates in buildings including infiltration
EN 15251 Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics
EN 15243:2007 history
2007EN 15243:2007 Ventilation for buildings - Calculation of room temperatures and of load and energy for buildings with room conditioning systems